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 - [`mips64-openwrt-linux-musl`: Add Tier 3 target][92300]
16 - [Add new 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]
25 - [Guarantee call order for `sort_by_cached_key`][89621]
26 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
27 - [Switch all libraries to the 2021 edition][92068]
28 - [Make `Instant::{duration_since, elapsed, sub}` saturating and remove workarounds][89926]
29 - [Change PhantomData type for `BuildHasherDefault` (and more)][92630]
33 - [`Arc::new_cyclic`][arc_new_cyclic]
34 - [`Rc::new_cyclic`][rc_new_cyclic]
35 - [`slice::EscapeAscii`][slice_escape_ascii]
36 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
37 - [`u8::escape_ascii`][u8_escape_ascii]
38 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
39 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
40 - [`MaybeUninit::assume_init_read`][assume_init_read]
41 - [`i8::abs_diff`][i8_abs_diff]
42 - [`i16::abs_diff`][i16_abs_diff]
43 - [`i32::abs_diff`][i32_abs_diff]
44 - [`i64::abs_diff`][i64_abs_diff]
45 - [`i128::abs_diff`][i128_abs_diff]
46 - [`isize::abs_diff`][isize_abs_diff]
47 - [`u8::abs_diff`][u8_abs_diff]
48 - [`u16::abs_diff`][u16_abs_diff]
49 - [`u32::abs_diff`][u32_abs_diff]
50 - [`u64::abs_diff`][u64_abs_diff]
51 - [`u128::abs_diff`][u128_abs_diff]
52 - [`usize::abs_diff`][usize_abs_diff]
53 - [`Display for io::ErrorKind`][display_error_kind]
54 - [`From<u8> for ExitCode`][from_u8_exit_code]
55 - [`Not for !` (the "never" type)][not_never]
56 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
57 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
61 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
62 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
63 - [Stabilize namespaced and weak dependency features.][cargo/10269]
64 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
65 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
69 - [Add manifest docs fallback for tier-2 platforms.][92800]
70 - [Drop rustc-docs from complete profile][93742]
71 - [bootstrap: tidy up flag handling for llvm build][93918]
75 - [Remove compiler-rt linking hack on Android][83822]
76 - [Remove deprecated LLVM-style inline assembly][92816]
77 - [Reject unsupported naked functions][93153]
82 These changes provide no direct user facing benefits, but represent significant
83 improvements to the internals and overall performance of rustc
86 <!-- TODO: anything to highlight? -->
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 [92816]: https://github.com/rust-lang/rust/pull/92816
104 [92933]: https://github.com/rust-lang/rust/pull/92933
105 [93153]: https://github.com/rust-lang/rust/pull/93153
106 [93566]: https://github.com/rust-lang/rust/pull/93566
107 [93577]: https://github.com/rust-lang/rust/pull/93577
108 [93658]: https://github.com/rust-lang/rust/pull/93658
109 [93742]: https://github.com/rust-lang/rust/pull/93742
110 [93824]: https://github.com/rust-lang/rust/pull/93824
111 [93918]: https://github.com/rust-lang/rust/pull/93918
113 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
114 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
115 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
116 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
117 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
119 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
120 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
121 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
122 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
123 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
124 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
125 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
126 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
127 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
128 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
129 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
130 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
131 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
132 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
133 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
134 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
135 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
136 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
137 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
138 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
139 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
140 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
141 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
142 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
143 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
145 Version 1.59.0 (2022-02-24)
146 ==========================
151 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
152 - [Stabilize destructuring assignment][90521]
153 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
154 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
159 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
160 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
161 - [Fix sparc64 ABI for aggregates with floating point members][91003]
162 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
163 - [Add support for riscv64gc-unknown-freebsd][91284]
164 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
165 - [Soft disable incremental compilation][94124]
167 This release disables incremental compilation, unless the user has explicitly
168 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
169 This is due to a known and relatively frequently occurring bug in incremental
170 compilation, which causes builds to issue internal compiler errors. This
171 particular bug is already fixed on nightly, but that fix has not yet rolled out
172 to stable and is deemed too risky for a direct stable backport.
174 As always, we encourage users to test with nightly and report bugs so that we
175 can track failures and fix issues earlier.
177 See [94124] for more details.
179 [94124]: https://github.com/rust-lang/rust/issues/94124
184 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
189 - [`std::thread::available_parallelism`][available_parallelism]
190 - [`Result::copied`][result-copied]
191 - [`Result::cloned`][result-cloned]
192 - [`arch::asm!`][asm]
193 - [`arch::global_asm!`][global_asm]
194 - [`ops::ControlFlow::is_break`][is_break]
195 - [`ops::ControlFlow::is_continue`][is_continue]
196 - [`TryFrom<char> for u8`][try_from_char_u8]
197 - [`char::TryFromCharError`][try_from_char_err]
198 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
200 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
201 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
202 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
203 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
204 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
205 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
206 - [`DoubleEndedIterator for ToLowercase`][lowercase]
207 - [`DoubleEndedIterator for ToUppercase`][uppercase]
208 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
209 - [`UnwindSafe for Once`][unwindsafe_once]
210 - [`RefUnwindSafe for Once`][refunwindsafe_once]
211 - [armv8 neon intrinsics for aarch64][stdarch/1266]
215 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
216 - [`mem::MaybeUninit::assume_init`][muninit_init]
217 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
218 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
223 - [Stabilize the `strip` profile option][cargo/10088]
224 - [Stabilize future-incompat-report][cargo/10165]
225 - [Support abbreviating `--release` as `-r`][cargo/10133]
226 - [Support `term.quiet` configuration][cargo/10152]
227 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
232 - [Refactor weak symbols in std::sys::unix][90846]
233 This may add new, versioned, symbols when building with a newer glibc, as the
234 standard library uses weak linkage rather than dynamically attempting to load
235 certain symbols at runtime.
236 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
237 This adds a future compatibility lint to supporting the use of cfg_attr
238 wrapping either crate_type or crate_name specification within Rust files;
239 it is recommended that users migrate to setting the equivalent command line
241 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
242 This may expose new names, leading to conflicts with preexisting names in a
243 given namespace and a compilation failure.
244 - [Cargo will document libraries before binaries.][cargo/10172]
245 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
246 - [Weaken guarantee around advancing underlying iterators in zip][83791]
247 - [Make split_inclusive() on an empty slice yield an empty output][89825]
248 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
249 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
254 These changes provide no direct user facing benefits, but represent significant
255 improvements to the internals and overall performance of rustc
258 - [Fix many cases of normalization-related ICEs][91255]
259 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
260 - [Store liveness in interval sets for region inference][90637]
262 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
263 unstable feature.][91867]
265 [91867]: https://github.com/rust-lang/rust/issues/91867
266 [83744]: https://github.com/rust-lang/rust/pull/83744/
267 [83791]: https://github.com/rust-lang/rust/pull/83791/
268 [85013]: https://github.com/rust-lang/rust/pull/85013/
269 [89825]: https://github.com/rust-lang/rust/pull/89825/
270 [89999]: https://github.com/rust-lang/rust/pull/89999/
271 [90128]: https://github.com/rust-lang/rust/pull/90128/
272 [90207]: https://github.com/rust-lang/rust/pull/90207/
273 [90521]: https://github.com/rust-lang/rust/pull/90521/
274 [90586]: https://github.com/rust-lang/rust/pull/90586/
275 [90637]: https://github.com/rust-lang/rust/pull/90637/
276 [90833]: https://github.com/rust-lang/rust/pull/90833/
277 [90846]: https://github.com/rust-lang/rust/pull/90846/
278 [91003]: https://github.com/rust-lang/rust/pull/91003/
279 [91172]: https://github.com/rust-lang/rust/pull/91172/
280 [91255]: https://github.com/rust-lang/rust/pull/91255/
281 [91284]: https://github.com/rust-lang/rust/pull/91284/
282 [91535]: https://github.com/rust-lang/rust/pull/91535/
283 [91593]: https://github.com/rust-lang/rust/pull/91593/
284 [91728]: https://github.com/rust-lang/rust/pull/91728/
285 [91878]: https://github.com/rust-lang/rust/pull/91878/
286 [91896]: https://github.com/rust-lang/rust/pull/91896/
287 [91926]: https://github.com/rust-lang/rust/pull/91926/
288 [91984]: https://github.com/rust-lang/rust/pull/91984/
289 [92020]: https://github.com/rust-lang/rust/pull/92020/
290 [92034]: https://github.com/rust-lang/rust/pull/92034/
291 [92137]: https://github.com/rust-lang/rust/pull/92137/
292 [92483]: https://github.com/rust-lang/rust/pull/92483/
293 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
294 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
295 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
296 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
297 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
298 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
299 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
300 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
302 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
303 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
304 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
305 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
306 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
307 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
308 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
309 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
310 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
311 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
312 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
313 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
314 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
315 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
316 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
317 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
318 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
319 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
320 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
321 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
322 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
323 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
324 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
325 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
326 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
327 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
329 Version 1.58.1 (2022-01-19)
330 ===========================
332 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
333 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
334 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
335 * [Fix wrong error message displayed when some imports are missing][91254]
336 * [Fix rustfmt not formatting generated files from stdin][92912]
338 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
339 [91254]: https://github.com/rust-lang/rust/pull/91254
340 [92912]: https://github.com/rust-lang/rust/pull/92912
341 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
342 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
344 Version 1.58.0 (2022-01-13)
345 ==========================
350 - [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.
351 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
352 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
357 - [Add LLVM CFI support to the Rust compiler][89652]
358 - [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.
359 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
360 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
361 - [Update the minimum external LLVM to 12][90175]
362 - [Add `x86_64-unknown-none` at Tier 3*][89062]
363 - [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.
364 - [Don't abort compilation after giving a lint error][87337]
365 - [Error messages point at the source of trait bound obligations in more places][89580]
367 \* Refer to Rust's [platform support page][platform-support-doc] for more
368 information on Rust's tiered platform support.
373 - [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.
374 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
375 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
376 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
377 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
378 - [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).
383 - [`Metadata::is_symlink`]
384 - [`Path::is_symlink`]
385 - [`{integer}::saturating_div`]
386 - [`Option::unwrap_unchecked`]
387 - [`Result::unwrap_unchecked`]
388 - [`Result::unwrap_err_unchecked`]
391 These APIs are now usable in const contexts:
394 - [`Duration::checked_add`]
395 - [`Duration::saturating_add`]
396 - [`Duration::checked_sub`]
397 - [`Duration::saturating_sub`]
398 - [`Duration::checked_mul`]
399 - [`Duration::saturating_mul`]
400 - [`Duration::checked_div`]
405 - [Add --message-format for install command][cargo/10107]
406 - [Warn when alias shadows external subcommand][cargo/10082]
411 - [Show all Deref implementations recursively in rustdoc][90183]
412 - [Use computed visibility in rustdoc][88447]
417 - [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.
418 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
419 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
420 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
421 - [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.
422 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
427 These changes provide no direct user facing benefits, but represent significant
428 improvements to the internals and overall performance of rustc
431 - [Implement coherence checks for negative trait impls][90104]
432 - [Add rustc lint, warning when iterating over hashmaps][89558]
433 - [Optimize live point computation][90491]
434 - [Enable verification for 1/32nd of queries loaded from disk][90361]
435 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
437 [87337]: https://github.com/rust-lang/rust/pull/87337/
438 [87467]: https://github.com/rust-lang/rust/pull/87467/
439 [87704]: https://github.com/rust-lang/rust/pull/87704/
440 [88041]: https://github.com/rust-lang/rust/pull/88041/
441 [88447]: https://github.com/rust-lang/rust/pull/88447/
442 [88601]: https://github.com/rust-lang/rust/pull/88601/
443 [89062]: https://github.com/rust-lang/rust/pull/89062/
444 [89174]: https://github.com/rust-lang/rust/pull/89174/
445 [89551]: https://github.com/rust-lang/rust/pull/89551/
446 [89558]: https://github.com/rust-lang/rust/pull/89558/
447 [89580]: https://github.com/rust-lang/rust/pull/89580/
448 [89652]: https://github.com/rust-lang/rust/pull/89652/
449 [90041]: https://github.com/rust-lang/rust/pull/90041/
450 [90058]: https://github.com/rust-lang/rust/pull/90058/
451 [90104]: https://github.com/rust-lang/rust/pull/90104/
452 [90117]: https://github.com/rust-lang/rust/pull/90117/
453 [90175]: https://github.com/rust-lang/rust/pull/90175/
454 [90183]: https://github.com/rust-lang/rust/pull/90183/
455 [90297]: https://github.com/rust-lang/rust/pull/90297/
456 [90329]: https://github.com/rust-lang/rust/pull/90329/
457 [90361]: https://github.com/rust-lang/rust/pull/90361/
458 [90417]: https://github.com/rust-lang/rust/pull/90417/
459 [90473]: https://github.com/rust-lang/rust/pull/90473/
460 [90491]: https://github.com/rust-lang/rust/pull/90491/
461 [90733]: https://github.com/rust-lang/rust/pull/90733/
462 [90833]: https://github.com/rust-lang/rust/pull/90833/
463 [90846]: https://github.com/rust-lang/rust/pull/90846/
464 [91026]: https://github.com/rust-lang/rust/pull/91026/
465 [91207]: https://github.com/rust-lang/rust/pull/91207/
466 [91255]: https://github.com/rust-lang/rust/pull/91255/
467 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
468 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
469 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
470 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
471 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
472 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
473 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
474 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
475 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
476 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
478 Version 1.57.0 (2021-12-02)
479 ==========================
484 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
485 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
486 - [Allow panicking in constant evaluation.][89508]
487 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
492 - [Create more accurate debuginfo for vtables.][89597]
493 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
494 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
495 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
496 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
498 \* Refer to Rust's [platform support page][platform-support-doc] for more
499 information on Rust's tiered platform support.
504 - [Avoid allocations and copying in `Vec::leak`][89337]
505 - [Add `#[repr(i8)]` to `Ordering`][89507]
506 - [Optimize `File::read_to_end` and `read_to_string`][89582]
507 - [Update to Unicode 14.0][89614]
508 - [Many more functions are marked `#[must_use]`][89692], producing a warning
509 when ignoring their return value. This helps catch mistakes such as expecting
510 a function to mutate a value in place rather than return a new value.
515 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
516 - [`[T; N]::as_slice`][`array::as_slice`]
517 - [`collections::TryReserveError`]
518 - [`HashMap::try_reserve`]
519 - [`HashSet::try_reserve`]
520 - [`String::try_reserve`]
521 - [`String::try_reserve_exact`]
522 - [`Vec::try_reserve`]
523 - [`Vec::try_reserve_exact`]
524 - [`VecDeque::try_reserve`]
525 - [`VecDeque::try_reserve_exact`]
526 - [`Iterator::map_while`]
528 - [`proc_macro::is_available`]
529 - [`Command::get_program`]
530 - [`Command::get_args`]
531 - [`Command::get_envs`]
532 - [`Command::get_current_dir`]
536 These APIs are now usable in const contexts:
538 - [`hint::unreachable_unchecked`]
543 - [Stabilize custom profiles][cargo/9943]
548 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
549 This will break some builds that set `#![deny(dead_code)]`.
553 These changes provide no direct user facing benefits, but represent significant
554 improvements to the internals and overall performance of rustc
557 - [Added an experimental backend for codegen with `libgccjit`.][87260]
559 [85200]: https://github.com/rust-lang/rust/pull/85200/
560 [86191]: https://github.com/rust-lang/rust/pull/86191/
561 [87220]: https://github.com/rust-lang/rust/pull/87220/
562 [87260]: https://github.com/rust-lang/rust/pull/87260/
563 [88321]: https://github.com/rust-lang/rust/pull/88321/
564 [88529]: https://github.com/rust-lang/rust/pull/88529/
565 [88690]: https://github.com/rust-lang/rust/pull/88690/
566 [88952]: https://github.com/rust-lang/rust/pull/88952/
567 [89337]: https://github.com/rust-lang/rust/pull/89337/
568 [89507]: https://github.com/rust-lang/rust/pull/89507/
569 [89508]: https://github.com/rust-lang/rust/pull/89508/
570 [89582]: https://github.com/rust-lang/rust/pull/89582/
571 [89597]: https://github.com/rust-lang/rust/pull/89597/
572 [89614]: https://github.com/rust-lang/rust/pull/89614/
573 [89692]: https://github.com/rust-lang/rust/issues/89692/
574 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
575 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
576 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
577 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
578 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
579 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
580 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
581 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
582 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
583 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
584 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
585 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
586 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
587 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
588 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
589 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
590 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
591 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
592 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
593 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
594 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
596 Version 1.56.1 (2021-11-01)
597 ===========================
599 - New lints to detect the presence of bidirectional-override Unicode
600 codepoints in the compiled source code ([CVE-2021-42574])
602 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
604 Version 1.56.0 (2021-10-21)
605 ========================
610 - [The 2021 Edition is now stable.][rust#88100]
611 See [the edition guide][rust-2021-edition-guide] for more details.
612 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
613 - [Union field access is permitted in `const fn`.][rust#85769]
615 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
620 - [Upgrade to LLVM 13.][rust#87570]
621 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
622 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
623 - [Warnings can be forced on with `--force-warn`.][rust#87472]
624 This feature is primarily intended for usage by `cargo fix`, rather than end users.
625 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
626 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
627 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
629 \* Refer to Rust's [platform support page][platform-support-doc] for more
630 information on Rust's tiered platform support.
635 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
636 The Windows console still requires valid Unicode, but this change allows
637 splitting a UTF-8 character across multiple write calls. This allows, for
638 instance, programs that just read and write data buffers (e.g. copying a file
639 to stdout) without regard for Unicode or character boundaries.
640 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
641 For this use case, atomics scale much better under contention.
642 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
643 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
644 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
645 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
646 - [Treat invalid environment variable names as non-existent.][rust#86183]
647 Previously, the environment functions would panic if given a variable name
648 with an internal null character or equal sign (`=`). Now, these functions will
649 just treat such names as non-existent variables, since the OS cannot represent
650 the existence of a variable with such a name.
655 - [`std::os::unix::fs::chroot`]
656 - [`UnsafeCell::raw_get`]
657 - [`BufWriter::into_parts`]
658 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
659 These APIs were previously stable in `std`, but are now also available in `core`.
661 - [`String::shrink_to`]
662 - [`OsString::shrink_to`]
663 - [`PathBuf::shrink_to`]
664 - [`BinaryHeap::shrink_to`]
665 - [`VecDeque::shrink_to`]
666 - [`HashMap::shrink_to`]
667 - [`HashSet::shrink_to`]
669 These APIs are now usable in const contexts:
671 - [`std::mem::transmute`]
672 - [`[T]::first`][`slice::first`]
673 - [`[T]::split_first`][`slice::split_first`]
674 - [`[T]::last`][`slice::last`]
675 - [`[T]::split_last`][`slice::split_last`]
680 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
681 This has no effect at present on dependency version selection.
682 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
683 that support Rust code to include a crate's specified minimum version in the test matrix for that
689 - [Update to new argument parsing rules on Windows.][rust#87580]
690 This adjusts Rust's standard library to match the behavior of the standard
691 libraries for C/C++. The rules have changed slightly over time, and this PR
692 brings us to the latest set of rules (changed in 2008).
693 - [Disallow the aapcs calling convention on aarch64][rust#88399]
694 This was already not supported by LLVM; this change surfaces this lack of
695 support with a better error message.
696 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
697 - [Warn when an escaped newline skips multiple lines.][rust#87671]
698 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
699 may return different values on glibc <= 2.24.][rust#81825]
700 Rust now invokes the `clone3` system call directly, when available, to use new functionality
701 available via that system call. Older versions of glibc cache the result of `getpid`, and only
702 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
703 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
707 These changes provide no direct user facing benefits, but represent significant
708 improvements to the internals and overall performance of rustc
711 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
712 This improves the performance of most Rust builds.
713 - [Unify representation of macros in internal data structures.][rust#88019]
714 This change fixes a host of bugs with the handling of macros by the compiler,
717 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
718 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
719 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
720 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
721 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
722 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
723 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
724 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
725 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
726 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
727 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
728 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
729 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
730 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
731 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
732 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
733 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
734 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
735 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
736 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
737 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
738 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
739 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
740 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
741 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
742 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
743 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
744 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
745 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
746 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
747 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
748 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
749 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
750 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
751 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
752 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
753 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
754 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
755 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
756 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
757 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
758 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
760 Version 1.55.0 (2021-09-09)
761 ============================
765 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
766 will end at the maximum value of the integer.][83918]
767 - [You can now explicitly import the prelude of different editions
768 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
772 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
774 \* Refer to Rust's [platform support page][platform-support-doc] for more
775 information on Rust's tiered platform support.
780 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
781 These improvements should in general provide faster string parsing of floats,
782 no longer reject certain valid floating point values, and reduce
783 the produced code size for non-stripped artifacts.
784 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
791 - [`IntoInnerError::into_error`]
792 - [`IntoInnerError::into_parts`]
793 - [`MaybeUninit::assume_init_mut`]
794 - [`MaybeUninit::assume_init_ref`]
795 - [`MaybeUninit::write`]
797 - [`ops::ControlFlow`]
799 - [`x86::_bittestandcomplement`]
800 - [`x86::_bittestandreset`]
801 - [`x86::_bittestandset`]
802 - [`x86_64::_bittest64`]
803 - [`x86_64::_bittestandcomplement64`]
804 - [`x86_64::_bittestandreset64`]
805 - [`x86_64::_bittestandset64`]
807 The following previously stable functions are now `const`.
809 - [`str::from_utf8_unchecked`]
814 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
815 rustc in parallel such as when using `cargo test`.][cargo/9675]
816 - [The package definition in `cargo metadata` now includes the `"default_run"`
817 field from the manifest.][cargo/9550]
818 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
819 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
820 of packages.][cargo/9663]
824 - [Added "Go to item on exact match" search option.][85876]
825 - [The "Implementors" section on traits no longer shows redundant
826 method definitions.][85970]
827 - [Trait implementations are toggled open by default.][86260] This should make the
828 implementations more searchable by tools like `CTRL+F` in your browser.
829 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
830 through type aliases.][86334]
831 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
832 "Trait Implementations" section.][86513]
837 - [std functions that return an `io::Error` will no longer use the
838 `ErrorKind::Other` variant.][85746] This is to better reflect that these
839 kinds of errors could be categorised [into newer more specific `ErrorKind`
840 variants][79965], and that they do not represent a user error.
841 - [Using environment variable names with `process::Command` on Windows now
842 behaves as expected.][85270] Previously using envionment variables with
843 `Command` would cause them to be ASCII-uppercased.
844 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
845 with `rustdoc::`][86849]
846 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
847 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
848 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
851 [86849]: https://github.com/rust-lang/rust/pull/86849
852 [86513]: https://github.com/rust-lang/rust/pull/86513
853 [86334]: https://github.com/rust-lang/rust/pull/86334
854 [86260]: https://github.com/rust-lang/rust/pull/86260
855 [85970]: https://github.com/rust-lang/rust/pull/85970
856 [85876]: https://github.com/rust-lang/rust/pull/85876
857 [83572]: https://github.com/rust-lang/rust/pull/83572
858 [86294]: https://github.com/rust-lang/rust/pull/86294
859 [86858]: https://github.com/rust-lang/rust/pull/86858
860 [86761]: https://github.com/rust-lang/rust/pull/86761
861 [85746]: https://github.com/rust-lang/rust/pull/85746
862 [85270]: https://github.com/rust-lang/rust/pull/85270
863 [83918]: https://github.com/rust-lang/rust/pull/83918
864 [79965]: https://github.com/rust-lang/rust/pull/79965
865 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
866 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
867 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
868 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
869 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
870 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
871 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
872 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
873 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
874 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
875 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
876 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
877 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
878 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
879 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
880 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
881 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
882 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
883 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
884 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
885 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
886 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
889 Version 1.54.0 (2021-07-29)
890 ============================
893 -----------------------
895 - [You can now use macros for values in some built-in attributes.][83366]
896 This primarily allows you to call macros within the `#[doc]` attribute. For
897 example, to include external documentation in your crate, you can now write
900 #![doc = include_str!("README.md")]
903 - [You can now cast between unsized slice types (and types which contain
904 unsized slices) in `const fn`.][85078]
905 - [You can now use multiple generic lifetimes with `impl Trait` where the
906 lifetimes don't explicitly outlive another.][84701] In code this means
907 that you can now have `impl Trait<'a, 'b>` where as before you could
908 only have `impl Trait<'a, 'b> where 'b: 'a`.
911 -----------------------
913 - [Rustc will now search for custom JSON targets in
914 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
915 directory.][83800] You can find your sysroot directory by running
916 `rustc --print sysroot`.
917 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
918 - [You can now use `#[target_feature]` on safe functions when targeting
919 WebAssembly platforms.][84988]
920 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
921 - [Added tier 3\* support for `bpfel-unknown-none`
922 and `bpfeb-unknown-none`.][79608]
923 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
925 \* Refer to Rust's [platform support page][platform-support-doc] for more
926 information on Rust's tiered platform support.
929 -----------------------
931 - [`panic::panic_any` will now `#[track_caller]`.][85745]
932 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
933 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
934 - [The implementations of vendor intrinsics in core::arch have been
935 significantly refactored.][83278] The main user-visible changes are
936 a 50% reduction in the size of libcore.rlib and stricter validation
937 of constant operands passed to intrinsics. The latter is technically
938 a breaking change, but allows Rust to more closely match the C vendor
944 - [`BTreeMap::into_keys`]
945 - [`BTreeMap::into_values`]
946 - [`HashMap::into_keys`]
947 - [`HashMap::into_values`]
949 - [`VecDeque::binary_search`]
950 - [`VecDeque::binary_search_by`]
951 - [`VecDeque::binary_search_by_key`]
952 - [`VecDeque::partition_point`]
957 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
958 the dependency graph.][cargo/9520]
959 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
960 in the tree ][cargo/9499]
961 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
962 macro dependencies.][cargo/9488]
963 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
964 This variable points to a directory that integration tests and benches
965 can use as a "scratchpad" for testing filesystem operations.
969 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
970 - [Previously unsound code is no longer permitted where different constructors in branches
971 could require different lifetimes.][85574]
972 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
973 than before and may reject some previously accepted code.
974 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
975 when compiled with `codegen-units = 1`.][86063]
977 [85574]: https://github.com/rust-lang/rust/issues/85574
978 [86831]: https://github.com/rust-lang/rust/issues/86831
979 [86063]: https://github.com/rust-lang/rust/issues/86063
980 [79608]: https://github.com/rust-lang/rust/pull/79608
981 [84988]: https://github.com/rust-lang/rust/pull/84988
982 [84701]: https://github.com/rust-lang/rust/pull/84701
983 [84072]: https://github.com/rust-lang/rust/pull/84072
984 [85745]: https://github.com/rust-lang/rust/pull/85745
985 [84744]: https://github.com/rust-lang/rust/pull/84744
986 [85078]: https://github.com/rust-lang/rust/pull/85078
987 [84717]: https://github.com/rust-lang/rust/pull/84717
988 [83800]: https://github.com/rust-lang/rust/pull/83800
989 [83366]: https://github.com/rust-lang/rust/pull/83366
990 [83278]: https://github.com/rust-lang/rust/pull/83278
991 [85292]: https://github.com/rust-lang/rust/pull/85292
992 [82834]: https://github.com/rust-lang/rust/pull/82834
993 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
994 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
995 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
996 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
997 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
998 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
999 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1000 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1001 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1002 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1003 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1005 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1007 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1009 Version 1.53.0 (2021-06-17)
1010 ============================
1013 -----------------------
1014 - [You can now use unicode for identifiers.][83799] This allows multilingual
1015 identifiers but still doesn't allow glyphs that are not considered characters
1016 such as `◆` or `🦀`. More specifically you can now use any identifier that
1017 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1018 is the same standard as languages like Python, however Rust uses NFC
1019 normalization which may be different from other languages.
1020 - [You can now specify "or patterns" inside pattern matches.][79278]
1021 Previously you could only use `|` (OR) on complete patterns. E.g.
1025 matches!(x, Some(1) | Some(2));
1027 matches!(x, Some(1 | 2));
1029 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1030 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1031 to change semantics to being a pattern fragment in a future edition.
1034 -----------------------
1035 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1036 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1037 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1039 \* Refer to Rust's [platform support page][platform-support-doc] for more
1040 information on Rust's tiered platform support.
1043 -----------------------
1044 - [Abort messages will now forward to `android_set_abort_message` on
1045 Android platforms when available.][81469]
1046 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1047 - [Arrays of any length now implement `IntoIterator`.][84147]
1048 Currently calling `.into_iter()` as a method on an array will
1049 return `impl Iterator<Item=&T>`, but this may change in a
1050 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1051 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1052 - [`leading_zeros`, and `trailing_zeros` are now available on all
1053 `NonZero` integer types.][84082]
1054 - [`{f32, f64}::from_str` now parse and print special values
1055 (`NaN`, `-0`) according to IEEE 754.][78618]
1056 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1057 - [Add the `BITS` associated constant to all numeric types.][82565]
1061 - [`AtomicBool::fetch_update`]
1062 - [`AtomicPtr::fetch_update`]
1063 - [`BTreeMap::retain`]
1064 - [`BTreeSet::retain`]
1065 - [`BufReader::seek_relative`]
1066 - [`DebugStruct::non_exhaustive`]
1068 - [`Duration::ZERO`]
1069 - [`Duration::is_zero`]
1070 - [`Duration::saturating_add`]
1071 - [`Duration::saturating_mul`]
1072 - [`Duration::saturating_sub`]
1073 - [`ErrorKind::Unsupported`]
1074 - [`Option::insert`]
1075 - [`Ordering::is_eq`]
1076 - [`Ordering::is_ge`]
1077 - [`Ordering::is_gt`]
1078 - [`Ordering::is_le`]
1079 - [`Ordering::is_lt`]
1080 - [`Ordering::is_ne`]
1081 - [`OsStr::is_ascii`]
1082 - [`OsStr::make_ascii_lowercase`]
1083 - [`OsStr::make_ascii_uppercase`]
1084 - [`OsStr::to_ascii_lowercase`]
1085 - [`OsStr::to_ascii_uppercase`]
1086 - [`Peekable::peek_mut`]
1087 - [`Rc::decrement_strong_count`]
1088 - [`Rc::increment_strong_count`]
1089 - [`Vec::extend_from_within`]
1090 - [`array::from_mut`]
1091 - [`array::from_ref`]
1092 - [`cmp::max_by_key`]
1094 - [`cmp::min_by_key`]
1096 - [`f32::is_subnormal`]
1097 - [`f64::is_subnormal`]
1100 -----------------------
1101 - [Cargo now supports git repositories where the default `HEAD` branch is not
1102 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1103 which can handle default branches correctly.
1104 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1105 - [The `authors` field is no longer included in `Cargo.toml` for new
1106 projects.][cargo/9282]
1109 -----------------------
1110 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1111 without hyperlinks.][81764]
1115 - [Implement token-based handling of attributes during expansion][82608]
1116 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1117 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1118 to confusion and potential security vulnerabilities and [is no
1119 longer recommended][ietf6943].
1120 - [The added `BITS` constant may conflict with external definitions.][85667]
1121 In particular, this was known to be a problem in the `lexical-core` crate,
1122 but they have published fixes for semantic versions 0.4 through 0.7. To
1123 update this dependency alone, use `cargo update -p lexical-core`.
1124 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1128 These changes provide no direct user facing benefits, but represent significant
1129 improvements to the internals and overall performance of rustc and
1132 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1133 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1134 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1135 - [Rework rustdoc const type][82873]
1137 [85667]: https://github.com/rust-lang/rust/pull/85667
1138 [83386]: https://github.com/rust-lang/rust/pull/83386
1139 [82771]: https://github.com/rust-lang/rust/pull/82771
1140 [84147]: https://github.com/rust-lang/rust/pull/84147
1141 [84082]: https://github.com/rust-lang/rust/pull/84082
1142 [83799]: https://github.com/rust-lang/rust/pull/83799
1143 [83681]: https://github.com/rust-lang/rust/pull/83681
1144 [83652]: https://github.com/rust-lang/rust/pull/83652
1145 [83387]: https://github.com/rust-lang/rust/pull/83387
1146 [82873]: https://github.com/rust-lang/rust/pull/82873
1147 [82864]: https://github.com/rust-lang/rust/pull/82864
1148 [82608]: https://github.com/rust-lang/rust/pull/82608
1149 [82565]: https://github.com/rust-lang/rust/pull/82565
1150 [80525]: https://github.com/rust-lang/rust/pull/80525
1151 [79278]: https://github.com/rust-lang/rust/pull/79278
1152 [78618]: https://github.com/rust-lang/rust/pull/78618
1153 [77704]: https://github.com/rust-lang/rust/pull/77704
1154 [83941]: https://github.com/rust-lang/rust/pull/83941
1155 [83065]: https://github.com/rust-lang/rust/pull/83065
1156 [81764]: https://github.com/rust-lang/rust/pull/81764
1157 [81469]: https://github.com/rust-lang/rust/pull/81469
1158 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1159 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1160 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1161 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1162 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1163 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1164 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1165 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1166 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1167 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1168 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1169 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1170 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1171 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1172 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1173 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1174 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1175 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1176 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1177 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1178 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1179 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1180 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1181 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1182 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1183 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1184 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1185 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1186 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1187 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1188 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1189 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1190 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1191 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1192 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1193 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1194 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1195 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1196 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1197 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1198 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1201 Version 1.52.1 (2021-05-10)
1202 ============================
1204 This release disables incremental compilation, unless the user has explicitly
1205 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1207 This is due to the widespread, and frequently occurring, breakage encountered by
1208 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1209 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1210 newly added incremental verification are still present in past stable versions,
1211 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1214 These problems only affect incremental builds, so release builds with Cargo
1215 should not be affected unless the user has explicitly opted into incremental.
1216 Debug and check builds are affected.
1218 See [84970] for more details.
1220 [84970]: https://github.com/rust-lang/rust/issues/84970
1222 Version 1.52.0 (2021-05-06)
1223 ============================
1227 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1228 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1229 is allowed by default, and may become a warning or hard error in a
1231 - [You can now cast mutable references to arrays to a pointer of the same type as
1232 the element.][81479]
1236 - [Upgraded the default LLVM to LLVM 12.][81451]
1238 Added tier 3\* support for the following targets.
1240 - [`s390x-unknown-linux-musl`][82166]
1241 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1242 - [`powerpc-unknown-openbsd`][82733]
1244 \* Refer to Rust's [platform support page][platform-support-doc] for more
1245 information on Rust's tiered platform support.
1249 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1250 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1251 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1252 - [All integer division and remainder operations are now `const`.][80962]
1256 - [`Arguments::as_str`]
1258 - [`char::REPLACEMENT_CHARACTER`]
1259 - [`char::UNICODE_VERSION`]
1260 - [`char::decode_utf16`]
1261 - [`char::from_digit`]
1262 - [`char::from_u32_unchecked`]
1263 - [`char::from_u32`]
1264 - [`slice::partition_point`]
1265 - [`str::rsplit_once`]
1266 - [`str::split_once`]
1268 The following previously stable APIs are now `const`.
1270 - [`char::len_utf8`]
1271 - [`char::len_utf16`]
1272 - [`char::to_ascii_uppercase`]
1273 - [`char::to_ascii_lowercase`]
1274 - [`char::eq_ignore_ascii_case`]
1275 - [`u8::to_ascii_uppercase`]
1276 - [`u8::to_ascii_lowercase`]
1277 - [`u8::eq_ignore_ascii_case`]
1281 - [Rustdoc lints are now treated as a tool lint, meaning that
1282 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1283 Using the old style is still allowed, and will become a warning in
1285 - [Rustdoc now supports argument files.][82261]
1286 - [Rustdoc now generates smart punctuation for documentation.][79423]
1287 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1295 - [You can now pass multiple filters to tests.][81356] E.g.
1296 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1297 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1298 allowing you to see `std` symbols when debugging.][82218]
1302 These changes provide no direct user facing benefits, but represent significant
1303 improvements to the internals and overall performance of rustc and
1306 - [Check the result cache before the DepGraph when ensuring queries][81855]
1307 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1308 - [Only store a LocalDefId in some HIR nodes][81611]
1309 - [Store HIR attributes in a side table][79519]
1313 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1314 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1315 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1316 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1317 languages in code blocks.][78429]
1318 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1319 - [Changes in how proc macros handle whitespace may lead to panics when used
1320 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1321 - [Turn `#[derive]` into a regular macro attribute][79078]
1323 [84136]: https://github.com/rust-lang/rust/issues/84136
1324 [80763]: https://github.com/rust-lang/rust/pull/80763
1325 [82166]: https://github.com/rust-lang/rust/pull/82166
1326 [82121]: https://github.com/rust-lang/rust/pull/82121
1327 [81879]: https://github.com/rust-lang/rust/pull/81879
1328 [82261]: https://github.com/rust-lang/rust/pull/82261
1329 [82218]: https://github.com/rust-lang/rust/pull/82218
1330 [82216]: https://github.com/rust-lang/rust/pull/82216
1331 [82202]: https://github.com/rust-lang/rust/pull/82202
1332 [81855]: https://github.com/rust-lang/rust/pull/81855
1333 [81766]: https://github.com/rust-lang/rust/pull/81766
1334 [81744]: https://github.com/rust-lang/rust/pull/81744
1335 [81611]: https://github.com/rust-lang/rust/pull/81611
1336 [81479]: https://github.com/rust-lang/rust/pull/81479
1337 [81451]: https://github.com/rust-lang/rust/pull/81451
1338 [81356]: https://github.com/rust-lang/rust/pull/81356
1339 [80962]: https://github.com/rust-lang/rust/pull/80962
1340 [80553]: https://github.com/rust-lang/rust/pull/80553
1341 [80527]: https://github.com/rust-lang/rust/pull/80527
1342 [79519]: https://github.com/rust-lang/rust/pull/79519
1343 [79423]: https://github.com/rust-lang/rust/pull/79423
1344 [79208]: https://github.com/rust-lang/rust/pull/79208
1345 [78429]: https://github.com/rust-lang/rust/pull/78429
1346 [82733]: https://github.com/rust-lang/rust/pull/82733
1347 [82594]: https://github.com/rust-lang/rust/pull/82594
1348 [79078]: https://github.com/rust-lang/rust/pull/79078
1349 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1350 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1351 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1352 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1353 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1354 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1355 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1356 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1357 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1358 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1359 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1360 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1361 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1362 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1363 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1364 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1365 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1366 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1367 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1368 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1369 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1370 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1372 Version 1.51.0 (2021-03-25)
1373 ============================
1377 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1378 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1379 E.g. you can now write the following. Note: Only values of primitive integers,
1380 `bool`, or `char` types are currently permitted.
1382 struct GenericArray<T, const LENGTH: usize> {
1386 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1387 const fn last(&self) -> Option<&T> {
1391 Some(&self.inner[LENGTH - 1])
1401 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1402 This option controls whether debug information is split across multiple files
1403 or packed into a single file. **Note** This option is unstable on other platforms.
1404 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1405 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1406 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1407 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1409 \* Refer to Rust's [platform support page][platform-support-doc] for more
1410 information on Rust's tiered platform support.
1415 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1416 - [`str` now implements `AsMut<str>`.][80279]
1417 - [`u64` and `u128` now implement `From<char>`.][79502]
1418 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1419 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1420 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1421 - [`io::Empty` now implements `io::Seek`.][78044]
1422 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1423 `T: ?Sized` types.][80764]
1424 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1430 - [`Arc::decrement_strong_count`]
1431 - [`Arc::increment_strong_count`]
1432 - [`Once::call_once_force`]
1433 - [`Peekable::next_if_eq`]
1434 - [`Peekable::next_if`]
1435 - [`Seek::stream_position`]
1436 - [`array::IntoIter`]
1437 - [`panic::panic_any`]
1439 - [`ptr::addr_of_mut!`]
1440 - [`slice::fill_with`]
1441 - [`slice::split_inclusive_mut`]
1442 - [`slice::split_inclusive`]
1443 - [`slice::strip_prefix`]
1444 - [`slice::strip_suffix`]
1445 - [`str::split_inclusive`]
1446 - [`sync::OnceState`]
1448 - [`VecDeque::range`]
1449 - [`VecDeque::range_mut`]
1453 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1454 codegen option.][cargo/9112]
1455 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1456 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1457 to avoid unifying features of dependencies where that unification could be unwanted.
1458 Such as using the same dependency with a `std` feature in a build scripts and
1459 proc-macros, while using the `no-std` feature in the final binary. See the
1460 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1465 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1466 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1467 documentation.][79642]
1469 Various improvements to intra-doc links:
1471 - [You can link to non-path primitives such as `slice`.][80181]
1472 - [You can link to associated items.][74489]
1473 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1477 - [You can now pass `--include-ignored` to tests (e.g. with
1478 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1483 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1484 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1486 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1487 for the distributed artifacts.][81521]
1488 - `armv5te-unknown-linux-gnueabi`
1489 - `sparc64-unknown-linux-gnu`
1490 - `thumbv7neon-unknown-linux-gnueabihf`
1491 - `armv7-unknown-linux-gnueabi`
1492 - `x86_64-unknown-linux-gnux32`
1493 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1498 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1500 [79135]: https://github.com/rust-lang/rust/pull/79135
1501 [74489]: https://github.com/rust-lang/rust/pull/74489
1502 [76934]: https://github.com/rust-lang/rust/pull/76934
1503 [79570]: https://github.com/rust-lang/rust/pull/79570
1504 [80181]: https://github.com/rust-lang/rust/pull/80181
1505 [79642]: https://github.com/rust-lang/rust/pull/79642
1506 [80945]: https://github.com/rust-lang/rust/pull/80945
1507 [80279]: https://github.com/rust-lang/rust/pull/80279
1508 [80053]: https://github.com/rust-lang/rust/pull/80053
1509 [79502]: https://github.com/rust-lang/rust/pull/79502
1510 [75180]: https://github.com/rust-lang/rust/pull/75180
1511 [81521]: https://github.com/rust-lang/rust/pull/81521
1512 [80968]: https://github.com/rust-lang/rust/pull/80968
1513 [80959]: https://github.com/rust-lang/rust/pull/80959
1514 [80718]: https://github.com/rust-lang/rust/pull/80718
1515 [80653]: https://github.com/rust-lang/rust/pull/80653
1516 [80579]: https://github.com/rust-lang/rust/pull/80579
1517 [79998]: https://github.com/rust-lang/rust/pull/79998
1518 [78044]: https://github.com/rust-lang/rust/pull/78044
1519 [81455]: https://github.com/rust-lang/rust/pull/81455
1520 [80764]: https://github.com/rust-lang/rust/pull/80764
1521 [80749]: https://github.com/rust-lang/rust/pull/80749
1522 [80662]: https://github.com/rust-lang/rust/pull/80662
1523 [79134]: https://github.com/rust-lang/rust/pull/79134
1524 [80966]: https://github.com/rust-lang/rust/pull/80966
1525 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1526 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1527 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1528 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1529 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1530 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1531 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1532 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1533 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1534 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1535 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1536 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1537 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1538 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1539 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1540 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1541 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1542 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1543 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1544 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1545 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1546 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1547 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1549 Version 1.50.0 (2021-02-11)
1550 ============================
1553 -----------------------
1554 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1555 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1556 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1559 -----------------------
1560 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1561 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1562 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1563 - [Dropped support for all cloudabi targets.][78439]
1565 \* Refer to Rust's [platform support page][platform-support-doc] for more
1566 information on Rust's tiered platform support.
1569 -----------------------
1571 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1572 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1573 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1574 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1575 up the same amount of space as `File`.
1581 - [`btree_map::Entry::or_insert_with_key`]
1584 - [`hash_map::Entry::or_insert_with_key`]
1588 - [`UnsafeCell::get_mut`]
1590 The following previously stable methods are now `const`.
1592 - [`IpAddr::is_ipv4`]
1593 - [`IpAddr::is_ipv6`]
1594 - [`IpAddr::is_unspecified`]
1595 - [`IpAddr::is_loopback`]
1596 - [`IpAddr::is_multicast`]
1597 - [`Ipv4Addr::octets`]
1598 - [`Ipv4Addr::is_loopback`]
1599 - [`Ipv4Addr::is_private`]
1600 - [`Ipv4Addr::is_link_local`]
1601 - [`Ipv4Addr::is_multicast`]
1602 - [`Ipv4Addr::is_broadcast`]
1603 - [`Ipv4Addr::is_documentation`]
1604 - [`Ipv4Addr::to_ipv6_compatible`]
1605 - [`Ipv4Addr::to_ipv6_mapped`]
1606 - [`Ipv6Addr::segments`]
1607 - [`Ipv6Addr::is_unspecified`]
1608 - [`Ipv6Addr::is_loopback`]
1609 - [`Ipv6Addr::is_multicast`]
1610 - [`Ipv6Addr::to_ipv4`]
1613 - [`Layout::from_size_align`]
1614 - `pow` for all integer types.
1615 - `checked_pow` for all integer types.
1616 - `saturating_pow` for all integer types.
1617 - `wrapping_pow` for all integer types.
1618 - `next_power_of_two` for all unsigned integer types.
1619 - `checked_next_power_of_two` for all unsigned integer types.
1622 -----------------------
1624 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1625 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1626 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1627 contents of that directory for changes.][cargo/8973]
1628 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1633 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1634 - [Running tests will now print the total time taken to execute.][75752]
1639 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1640 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1641 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1642 unhygenic `macro_rules!` macros.][79472]
1643 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1644 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1645 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1646 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1647 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1648 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1650 [74989]: https://github.com/rust-lang/rust/pull/74989
1651 [79261]: https://github.com/rust-lang/rust/pull/79261
1652 [79896]: https://github.com/rust-lang/rust/pull/79896
1653 [79484]: https://github.com/rust-lang/rust/pull/79484
1654 [79472]: https://github.com/rust-lang/rust/pull/79472
1655 [79270]: https://github.com/rust-lang/rust/pull/79270
1656 [79003]: https://github.com/rust-lang/rust/pull/79003
1657 [78864]: https://github.com/rust-lang/rust/pull/78864
1658 [78636]: https://github.com/rust-lang/rust/pull/78636
1659 [78439]: https://github.com/rust-lang/rust/pull/78439
1660 [78343]: https://github.com/rust-lang/rust/pull/78343
1661 [78296]: https://github.com/rust-lang/rust/pull/78296
1662 [78068]: https://github.com/rust-lang/rust/pull/78068
1663 [75752]: https://github.com/rust-lang/rust/pull/75752
1664 [74699]: https://github.com/rust-lang/rust/pull/74699
1665 [78142]: https://github.com/rust-lang/rust/pull/78142
1666 [77484]: https://github.com/rust-lang/rust/pull/77484
1667 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1668 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1669 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1670 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1671 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1672 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1673 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1674 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1675 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1676 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1677 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1678 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1679 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1680 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1681 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1682 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1683 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1684 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1685 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1686 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1687 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1688 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1689 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1690 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1691 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1692 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1693 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1694 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1695 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1696 [`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
1697 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1698 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1699 [`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
1700 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1703 Version 1.49.0 (2020-12-31)
1704 ============================
1707 -----------------------
1709 - [Unions can now implement `Drop`, and you can now have a field in a union
1710 with `ManuallyDrop<T>`.][77547]
1711 - [You can now cast uninhabited enums to integers.][76199]
1712 - [You can now bind by reference and by move in patterns.][76119] This
1713 allows you to selectively borrow individual components of a type. E.g.
1721 let person = Person {
1722 name: String::from("Alice"),
1726 // `name` is moved out of person, but `age` is referenced.
1727 let Person { name, ref age } = person;
1728 println!("{} {}", name, age);
1732 -----------------------
1734 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1735 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1736 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1737 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1738 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1739 - [Output from threads spawned in tests is now captured.][78227]
1740 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1742 \* Refer to Rust's [platform support page][platform-support-doc] for more
1743 information on Rust's tiered platform support.
1746 -----------------------
1748 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1749 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1754 - [`slice::select_nth_unstable`]
1755 - [`slice::select_nth_unstable_by`]
1756 - [`slice::select_nth_unstable_by_key`]
1758 The following previously stable methods are now `const`.
1760 - [`Poll::is_ready`]
1761 - [`Poll::is_pending`]
1764 -----------------------
1765 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1766 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1767 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1768 variable will be set if the crate being built is one the user selected to build, either
1769 with `-p` or through defaults.
1770 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1776 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1777 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1778 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1779 Previously such invalid or unused attributes could be ignored.
1780 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1781 read [this post about the changes][rustdoc-ws-post] for more details.
1782 - [Trait bounds are no longer inferred for associated types.][79904]
1786 These changes provide no direct user facing benefits, but represent significant
1787 improvements to the internals and overall performance of rustc and
1790 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1791 Local Storage model.][78201]
1792 - [Calculate visibilities once in resolve.][78077]
1793 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1794 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1797 [75991]: https://github.com/rust-lang/rust/pull/75991
1798 [78951]: https://github.com/rust-lang/rust/pull/78951
1799 [78848]: https://github.com/rust-lang/rust/pull/78848
1800 [78746]: https://github.com/rust-lang/rust/pull/78746
1801 [78376]: https://github.com/rust-lang/rust/pull/78376
1802 [78228]: https://github.com/rust-lang/rust/pull/78228
1803 [78227]: https://github.com/rust-lang/rust/pull/78227
1804 [78201]: https://github.com/rust-lang/rust/pull/78201
1805 [78109]: https://github.com/rust-lang/rust/pull/78109
1806 [78077]: https://github.com/rust-lang/rust/pull/78077
1807 [77997]: https://github.com/rust-lang/rust/pull/77997
1808 [77703]: https://github.com/rust-lang/rust/pull/77703
1809 [77547]: https://github.com/rust-lang/rust/pull/77547
1810 [77015]: https://github.com/rust-lang/rust/pull/77015
1811 [76199]: https://github.com/rust-lang/rust/pull/76199
1812 [76119]: https://github.com/rust-lang/rust/pull/76119
1813 [75914]: https://github.com/rust-lang/rust/pull/75914
1814 [79004]: https://github.com/rust-lang/rust/pull/79004
1815 [78676]: https://github.com/rust-lang/rust/pull/78676
1816 [79904]: https://github.com/rust-lang/rust/issues/79904
1817 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1818 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1819 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1820 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1821 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1822 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1823 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1824 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1825 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1826 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1828 Version 1.48.0 (2020-11-19)
1829 ==========================
1834 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1835 is still rejected *semantically*, but can now be parsed by procedural macros.
1839 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1840 `rustc` whether to link its own C runtime and libraries or to rely on a external
1841 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1842 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1843 Note: If you're using cargo you must explicitly pass the `--target` flag.
1844 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1846 \* Refer to Rust's [platform support page][platform-support-doc] for more
1847 information on Rust's tiered platform support.
1851 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1852 and `&Stderr`.][76275]
1853 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1854 - [The `matches!` macro now supports having a trailing comma.][74880]
1855 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1856 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1860 - [`slice::as_ptr_range`]
1861 - [`slice::as_mut_ptr_range`]
1862 - [`VecDeque::make_contiguous`]
1863 - [`future::pending`]
1866 The following previously stable methods are now `const fn`'s:
1868 - [`Option::is_some`]
1869 - [`Option::is_none`]
1870 - [`Option::as_ref`]
1872 - [`Result::is_err`]
1873 - [`Result::as_ref`]
1874 - [`Ordering::reverse`]
1875 - [`Ordering::then`]
1882 - [You can now link to items in `rustdoc` using the intra-doc link
1883 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1884 a link to `std::future`'s documentation. See ["Linking to items by
1885 name"][intradoc-links] for more information.
1886 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1887 when searching through `rustdoc`'s UI.][75740]
1891 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1892 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1893 promoted to `'static` lifetime any more inside `const fn`s.
1894 - [Associated type bindings on trait objects are now verified to meet the bounds
1895 declared on the trait when checking that they implement the trait.][27675]
1896 - [When trait bounds on associated types or opaque types are ambiguous, the
1897 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1898 - [Fixed recursive nonterminals not being expanded in macros during
1899 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1900 correctly handling recursive nonterminal tokens.
1901 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1902 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1903 in places where they have no effect.][73461]
1904 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1905 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1906 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1907 disallow zero-initialization.][71274]
1908 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1909 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1910 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1911 see the [`catch_unwind`] documentation for further information.
1917 These changes provide no direct user facing benefits, but represent significant
1918 improvements to the internals and overall performance of rustc and
1921 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1922 You can continue building with `make` by setting `ninja=false` in
1924 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1925 - [Made `ensure_sufficient_stack()` non-generic][76680]
1927 [78143]: https://github.com/rust-lang/rust/issues/78143
1928 [76680]: https://github.com/rust-lang/rust/pull/76680/
1929 [76030]: https://github.com/rust-lang/rust/pull/76030/
1930 [70212]: https://github.com/rust-lang/rust/pull/70212/
1931 [27675]: https://github.com/rust-lang/rust/issues/27675/
1932 [54121]: https://github.com/rust-lang/rust/issues/54121/
1933 [71274]: https://github.com/rust-lang/rust/pull/71274/
1934 [77386]: https://github.com/rust-lang/rust/pull/77386/
1935 [77153]: https://github.com/rust-lang/rust/pull/77153/
1936 [77055]: https://github.com/rust-lang/rust/pull/77055/
1937 [76275]: https://github.com/rust-lang/rust/pull/76275/
1938 [76310]: https://github.com/rust-lang/rust/pull/76310/
1939 [76420]: https://github.com/rust-lang/rust/pull/76420/
1940 [76158]: https://github.com/rust-lang/rust/pull/76158/
1941 [75857]: https://github.com/rust-lang/rust/pull/75857/
1942 [75585]: https://github.com/rust-lang/rust/pull/75585/
1943 [75740]: https://github.com/rust-lang/rust/pull/75740/
1944 [75502]: https://github.com/rust-lang/rust/pull/75502/
1945 [74880]: https://github.com/rust-lang/rust/pull/74880/
1946 [74922]: https://github.com/rust-lang/rust/pull/74922/
1947 [74430]: https://github.com/rust-lang/rust/pull/74430/
1948 [74194]: https://github.com/rust-lang/rust/pull/74194/
1949 [73461]: https://github.com/rust-lang/rust/pull/73461/
1950 [73166]: https://github.com/rust-lang/rust/pull/73166/
1951 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1952 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1953 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1954 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1955 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1956 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1957 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1958 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1959 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1960 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1961 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1962 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1963 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1964 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1965 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1968 Version 1.47.0 (2020-10-08)
1969 ==========================
1973 - [Closures will now warn when not used.][74869]
1977 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1978 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1980 - [Upgraded to LLVM 11.][73526]
1981 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1982 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1983 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1985 \* Refer to Rust's [platform support page][platform-support-doc] for more
1986 information on Rust's tiered platform support.
1990 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1991 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1992 those of length less than 33.][74060]
1993 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1994 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1995 `PartialEq`, and `PartialOrd`.][73583]
1999 - [`Ident::new_raw`]
2000 - [`Range::is_empty`]
2001 - [`RangeInclusive::is_empty`]
2002 - [`Result::as_deref`]
2003 - [`Result::as_deref_mut`]
2005 - [`pointer::offset_from`]
2009 The following previously stable APIs have now been made const.
2011 - [The `new` method for all `NonZero` integers.][73858]
2012 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2013 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2014 methods for all integers.][73858]
2015 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2016 signed integers.][73858]
2017 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2018 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2019 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2020 `is_ascii_control` methods for `char` and `u8`.][73858]
2024 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2025 You can override this by setting the following in your `Cargo.toml`.
2027 [profile.release.build-override]
2030 - [`cargo-help` will now display man pages for commands rather just the
2031 `--help` text.][cargo/8456]
2032 - [`cargo-metadata` now emits a `test` field indicating if a target has
2033 tests enabled.][cargo/8478]
2034 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2035 - [`cargo-publish` will now use an alternative registry by default if it's the
2036 only registry specified in `package.publish`.][cargo/8571]
2040 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2041 type based search.][75366]
2042 - [Added the Ayu theme to rustdoc.][71237]
2046 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2047 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2048 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2049 help to preserve more span information.][73084] These changes may cause
2050 compiliation errors if your macro was unhygenic or didn't correctly handle
2052 - [Moved support for the CloudABI target to tier 3.][75568]
2053 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2054 - [Added the `rustc-docs` component.][75560] This allows you to install
2055 and read the documentation for the compiler internal APIs. (Currently only
2056 available for `x86_64-unknown-linux-gnu`.)
2061 - [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.
2063 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2064 [75048]: https://github.com/rust-lang/rust/pull/75048/
2065 [74163]: https://github.com/rust-lang/rust/pull/74163/
2066 [71237]: https://github.com/rust-lang/rust/pull/71237/
2067 [74869]: https://github.com/rust-lang/rust/pull/74869/
2068 [73858]: https://github.com/rust-lang/rust/pull/73858/
2069 [75716]: https://github.com/rust-lang/rust/pull/75716/
2070 [75560]: https://github.com/rust-lang/rust/pull/75560/
2071 [75568]: https://github.com/rust-lang/rust/pull/75568/
2072 [75366]: https://github.com/rust-lang/rust/pull/75366/
2073 [75204]: https://github.com/rust-lang/rust/pull/75204/
2074 [74650]: https://github.com/rust-lang/rust/pull/74650/
2075 [74419]: https://github.com/rust-lang/rust/pull/74419/
2076 [73964]: https://github.com/rust-lang/rust/pull/73964/
2077 [74021]: https://github.com/rust-lang/rust/pull/74021/
2078 [74060]: https://github.com/rust-lang/rust/pull/74060/
2079 [73893]: https://github.com/rust-lang/rust/pull/73893/
2080 [73526]: https://github.com/rust-lang/rust/pull/73526/
2081 [73583]: https://github.com/rust-lang/rust/pull/73583/
2082 [73084]: https://github.com/rust-lang/rust/pull/73084/
2083 [73197]: https://github.com/rust-lang/rust/pull/73197/
2084 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2085 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2086 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2087 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2088 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2089 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2090 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2091 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2092 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2093 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2094 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2095 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2096 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2097 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2100 Version 1.46.0 (2020-08-27)
2101 ==========================
2105 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2106 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2107 const functions.][73862]
2108 - [The `#[track_caller]` attribute can now be added to functions to use the
2109 function's caller's location information for panic messages.][72445]
2110 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2111 `x.0.0` over `(x.0).0`.
2112 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2113 You currently can't use `mem::transmute` in constant functions.
2117 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2118 - [Enabled static "Position Independent Executables" by default
2119 for `x86_64-unknown-linux-musl`.][70740]
2123 - [`mem::forget` is now a `const fn`.][73887]
2124 - [`String` now implements `From<char>`.][73466]
2125 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2126 integer types.][73032]
2127 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2128 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2129 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2130 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2131 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2132 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2137 - [`vec::Drain::as_slice`]
2141 Added a number of new environment variables that are now available when
2142 compiling your crate.
2144 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2145 the specific binary being compiled and the name of the crate.
2146 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2147 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2151 - [The target configuration option `abi_blacklist` has been renamed
2152 to `unsupported_abis`.][74150] The old name will still continue to work.
2153 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2154 This was previously accepted but will become a hard error in a future release.
2155 - [Rustc will fail to compile if you have a struct with
2156 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2158 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2159 ensure that spans have the correct information, and may cause breakage if you
2160 were relying on receiving spans with dummy information.
2161 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2162 a legacy installer that was replaced by a MSI installer a few years ago but
2163 was still being built.
2164 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2165 - [Rustc will no longer accept overlapping trait implementations that only
2166 differ in how the lifetime was bound.][72493]
2167 - [Rustc now correctly relates the lifetime of an existential associated
2168 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2169 you to pass a shorter lifetime than expected.
2170 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2171 The library will need to be installed for `rustc` to work, even though we
2172 expect it to be already available on most systems.
2173 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2175 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2176 exact output returned by rustc's pretty printing is an unstable
2177 implementation detail: we recommend any macro relying on it to switch to a
2178 more robust parsing system.
2180 [75453]: https://github.com/rust-lang/rust/issues/75453/
2181 [74820]: https://github.com/rust-lang/rust/issues/74820/
2182 [74420]: https://github.com/rust-lang/rust/issues/74420/
2183 [74109]: https://github.com/rust-lang/rust/pull/74109/
2184 [74150]: https://github.com/rust-lang/rust/pull/74150/
2185 [73862]: https://github.com/rust-lang/rust/pull/73862/
2186 [73887]: https://github.com/rust-lang/rust/pull/73887/
2187 [73466]: https://github.com/rust-lang/rust/pull/73466/
2188 [73516]: https://github.com/rust-lang/rust/pull/73516/
2189 [73293]: https://github.com/rust-lang/rust/pull/73293/
2190 [73007]: https://github.com/rust-lang/rust/pull/73007/
2191 [73032]: https://github.com/rust-lang/rust/pull/73032/
2192 [72920]: https://github.com/rust-lang/rust/pull/72920/
2193 [72569]: https://github.com/rust-lang/rust/pull/72569/
2194 [72583]: https://github.com/rust-lang/rust/pull/72583/
2195 [72584]: https://github.com/rust-lang/rust/pull/72584/
2196 [72717]: https://github.com/rust-lang/rust/pull/72717/
2197 [72437]: https://github.com/rust-lang/rust/pull/72437/
2198 [72445]: https://github.com/rust-lang/rust/pull/72445/
2199 [72486]: https://github.com/rust-lang/rust/pull/72486/
2200 [72493]: https://github.com/rust-lang/rust/pull/72493/
2201 [72331]: https://github.com/rust-lang/rust/pull/72331/
2202 [71896]: https://github.com/rust-lang/rust/pull/71896/
2203 [71660]: https://github.com/rust-lang/rust/pull/71660/
2204 [71322]: https://github.com/rust-lang/rust/pull/71322/
2205 [70740]: https://github.com/rust-lang/rust/pull/70740/
2206 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2207 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2208 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2209 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2210 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2213 Version 1.45.2 (2020-08-03)
2214 ==========================
2216 * [Fix bindings in tuple struct patterns][74954]
2217 * [Fix track_caller integration with trait objects][74784]
2219 [74954]: https://github.com/rust-lang/rust/issues/74954
2220 [74784]: https://github.com/rust-lang/rust/issues/74784
2223 Version 1.45.1 (2020-07-30)
2224 ==========================
2226 * [Fix const propagation with references.][73613]
2227 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2228 * [Avoid spurious implicit region bound.][74509]
2229 * [Install clippy on x.py install][74457]
2231 [73613]: https://github.com/rust-lang/rust/pull/73613
2232 [73078]: https://github.com/rust-lang/rust/issues/73078
2233 [74509]: https://github.com/rust-lang/rust/pull/74509
2234 [74457]: https://github.com/rust-lang/rust/pull/74457
2237 Version 1.45.0 (2020-07-16)
2238 ==========================
2242 - [Out of range float to int conversions using `as` has been defined as a saturating
2243 conversion.][71269] This was previously undefined behaviour, but you can use the
2244 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2245 may be desirable in rare performance sensitive situations.
2246 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2247 using `u64`.][70705]
2248 - [Function like procedural macros can now be used in expression, pattern, and statement
2249 positions.][68717] This means you can now use a function-like procedural macro
2250 anywhere you can use a declarative (`macro_rules!`) macro.
2254 - [You can now override individual target features through the `target-feature`
2255 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2256 equivalent to `-C target-feature=+avx2,+fma`.
2257 - [Added the `force-unwind-tables` flag.][69984] This option allows
2258 rustc to always generate unwind tables regardless of panic strategy.
2259 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2260 to include LLVM bitcode into generated `rlib`s (this is on by default).
2261 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2262 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2263 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2264 - [Upgraded to LLVM 10.][67759]
2266 \* Refer to Rust's [platform support page][platform-support-doc] for more
2267 information on Rust's tiered platform support.
2272 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2274 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2275 - [You can now use `char` with
2276 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2277 a range of codepoints.][72413] E.g.
2278 you can now write the following;
2280 for ch in 'a'..='z' {
2284 // Prints "abcdefghijklmnopqrstuvwxyz"
2286 - [`OsString` now implements `FromStr`.][71662]
2287 - [The `saturating_neg` method has been added to all signed integer primitive
2288 types, and the `saturating_abs` method has been added for all integer
2289 primitive types.][71886]
2290 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2291 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2293 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2294 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2295 integer types.][69813]
2296 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2297 integer types.][72324]
2298 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2303 - [`BTreeMap::remove_entry`]
2305 - [`rc::Weak::as_ptr`]
2306 - [`rc::Weak::from_raw`]
2307 - [`rc::Weak::into_raw`]
2308 - [`str::strip_prefix`]
2309 - [`str::strip_suffix`]
2310 - [`sync::Weak::as_ptr`]
2311 - [`sync::Weak::from_raw`]
2312 - [`sync::Weak::into_raw`]
2313 - [`char::UNICODE_VERSION`]
2314 - [`Span::resolved_at`]
2315 - [`Span::located_at`]
2316 - [`Span::mixed_site`]
2317 - [`unix::process::CommandExt::arg0`]
2322 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2327 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2328 `~~outdated information~~` becomes "~~outdated information~~".
2329 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2333 - [Trying to self initialize a static value (that is creating a value using
2334 itself) is unsound and now causes a compile error.][71140]
2335 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2336 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2337 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2338 previously undocumented and not intended for public use. Rustdoc still provides
2339 a non-zero exit code on errors.
2340 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2341 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2342 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2343 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2344 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2348 - [Make clippy a git subtree instead of a git submodule][70655]
2349 - [Unify the undo log of all snapshot types][69464]
2351 [71848]: https://github.com/rust-lang/rust/issues/71848/
2352 [73420]: https://github.com/rust-lang/rust/issues/73420/
2353 [72324]: https://github.com/rust-lang/rust/pull/72324/
2354 [71843]: https://github.com/rust-lang/rust/pull/71843/
2355 [71886]: https://github.com/rust-lang/rust/pull/71886/
2356 [72234]: https://github.com/rust-lang/rust/pull/72234/
2357 [72239]: https://github.com/rust-lang/rust/pull/72239/
2358 [72397]: https://github.com/rust-lang/rust/pull/72397/
2359 [72413]: https://github.com/rust-lang/rust/pull/72413/
2360 [72014]: https://github.com/rust-lang/rust/pull/72014/
2361 [72062]: https://github.com/rust-lang/rust/pull/72062/
2362 [72094]: https://github.com/rust-lang/rust/pull/72094/
2363 [72133]: https://github.com/rust-lang/rust/pull/72133/
2364 [67759]: https://github.com/rust-lang/rust/pull/67759/
2365 [71900]: https://github.com/rust-lang/rust/pull/71900/
2366 [71928]: https://github.com/rust-lang/rust/pull/71928/
2367 [71662]: https://github.com/rust-lang/rust/pull/71662/
2368 [71716]: https://github.com/rust-lang/rust/pull/71716/
2369 [71447]: https://github.com/rust-lang/rust/pull/71447/
2370 [71269]: https://github.com/rust-lang/rust/pull/71269/
2371 [71095]: https://github.com/rust-lang/rust/pull/71095/
2372 [71140]: https://github.com/rust-lang/rust/pull/71140/
2373 [70655]: https://github.com/rust-lang/rust/pull/70655/
2374 [70705]: https://github.com/rust-lang/rust/pull/70705/
2375 [69984]: https://github.com/rust-lang/rust/pull/69984/
2376 [69813]: https://github.com/rust-lang/rust/pull/69813/
2377 [69464]: https://github.com/rust-lang/rust/pull/69464/
2378 [68717]: https://github.com/rust-lang/rust/pull/68717/
2379 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2380 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2381 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2382 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2383 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2384 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2385 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2386 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2387 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2388 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2389 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2390 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2391 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2392 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2393 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2394 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2395 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2398 Version 1.44.1 (2020-06-18)
2399 ===========================
2401 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2402 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2403 * [Fix crashes when finding backtrace on macOS.][71397]
2404 * [Clippy applies lint levels into different files.][clippy/5356]
2406 [71397]: https://github.com/rust-lang/rust/issues/71397
2407 [73078]: https://github.com/rust-lang/rust/issues/73078
2408 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2409 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2412 Version 1.44.0 (2020-06-04)
2413 ==========================
2417 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2418 - [Added the `unused_braces` lint.][70081]
2420 **Syntax-only changes**
2422 - [Expansion-driven outline module parsing][69838]
2427 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2432 These are still rejected semantically, so you will likely receive an error but
2433 these changes can be seen and parsed by macros and conditional compilation.
2437 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2438 Additionally when in incremental mode rustc defaults to 256 codegen units.
2439 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2440 a panic is thrown.][67502]
2441 - [Added tier 3\* support for the `aarch64-unknown-none` and
2442 `aarch64-unknown-none-softfloat` targets.][68334]
2443 - [Added tier 3 support for `arm64-apple-tvos` and
2444 `x86_64-apple-tvos` targets.][68191]
2449 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2450 `vec![]` to be able to be used in `const` contexts.
2451 - [`convert::Infallible` now implements `Hash`.][70281]
2452 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2453 a `&mut OsStr`.][70048]
2454 - [Unicode 13 is now supported.][69929]
2455 - [`String` now implements `From<&mut str>`.][69661]
2456 - [`IoSlice` now implements `Copy`.][69403]
2457 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2458 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2459 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2460 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2461 integer types.][69373]
2465 - [`PathBuf::with_capacity`]
2466 - [`PathBuf::capacity`]
2467 - [`PathBuf::clear`]
2468 - [`PathBuf::reserve`]
2469 - [`PathBuf::reserve_exact`]
2470 - [`PathBuf::shrink_to_fit`]
2471 - [`f32::to_int_unchecked`]
2472 - [`f64::to_int_unchecked`]
2473 - [`Layout::align_to`]
2474 - [`Layout::pad_to_align`]
2476 - [`Layout::extend`]
2480 - [Added the `cargo tree` command which will print a tree graph of
2481 your dependencies.][cargo/8062] E.g.
2483 mdbook v0.3.2 (/Users/src/rust/mdbook)
2485 │ ├── html5ever v0.24.0
2487 │ │ │ └── cfg-if v0.1.9
2489 │ │ └── markup5ever v0.9.0
2490 │ │ ├── log v0.4.8 (*)
2492 │ │ │ └── phf_shared v0.7.24
2493 │ │ │ ├── siphasher v0.2.3
2494 │ │ │ └── unicase v1.4.2
2495 │ │ │ [build-dependencies]
2496 │ │ │ └── version_check v0.1.5
2499 You can also display dependencies on multiple versions of the same crate with
2500 `cargo tree -d` (short for `cargo tree --duplicates`).
2504 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2505 the version in the sidebar.][69494]
2509 - [Rustc now correctly generates static libraries on Windows GNU targets with
2510 the `.a` extension, rather than the previous `.lib`.][70937]
2511 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2512 - [The `file_name` property in JSON output of macro errors now points the actual
2513 source file rather than the previous format of `<NAME macros>`.][70969]
2514 **Note:** this may not point to a file that actually exists on the user's system.
2515 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2516 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2517 not allow zero initialization such as `NonZeroU8`.][66059] This was
2518 previously a warning.
2519 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2520 operator has been defined as a saturating operation.][71269] This was previously
2521 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2522 continue using the current behaviour, which may be desirable in rare performance
2523 sensitive situations.
2527 These changes provide no direct user facing benefits, but represent significant
2528 improvements to the internals and overall performance of rustc and
2531 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2532 - [Replace big JS dict with JSON parsing.][71250]
2534 [69373]: https://github.com/rust-lang/rust/pull/69373/
2535 [66059]: https://github.com/rust-lang/rust/pull/66059/
2536 [68191]: https://github.com/rust-lang/rust/pull/68191/
2537 [68899]: https://github.com/rust-lang/rust/pull/68899/
2538 [71147]: https://github.com/rust-lang/rust/pull/71147/
2539 [71250]: https://github.com/rust-lang/rust/pull/71250/
2540 [70937]: https://github.com/rust-lang/rust/pull/70937/
2541 [70969]: https://github.com/rust-lang/rust/pull/70969/
2542 [70632]: https://github.com/rust-lang/rust/pull/70632/
2543 [70281]: https://github.com/rust-lang/rust/pull/70281/
2544 [70345]: https://github.com/rust-lang/rust/pull/70345/
2545 [70048]: https://github.com/rust-lang/rust/pull/70048/
2546 [70081]: https://github.com/rust-lang/rust/pull/70081/
2547 [70156]: https://github.com/rust-lang/rust/pull/70156/
2548 [71269]: https://github.com/rust-lang/rust/pull/71269/
2549 [69838]: https://github.com/rust-lang/rust/pull/69838/
2550 [69929]: https://github.com/rust-lang/rust/pull/69929/
2551 [69661]: https://github.com/rust-lang/rust/pull/69661/
2552 [69778]: https://github.com/rust-lang/rust/pull/69778/
2553 [69494]: https://github.com/rust-lang/rust/pull/69494/
2554 [69403]: https://github.com/rust-lang/rust/pull/69403/
2555 [69033]: https://github.com/rust-lang/rust/pull/69033/
2556 [68692]: https://github.com/rust-lang/rust/pull/68692/
2557 [68334]: https://github.com/rust-lang/rust/pull/68334/
2558 [67502]: https://github.com/rust-lang/rust/pull/67502/
2559 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2560 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2561 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2562 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2563 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2564 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2565 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2566 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2567 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2568 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2569 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2570 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2571 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2574 Version 1.43.1 (2020-05-07)
2575 ===========================
2577 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2578 * [Fixed the stabilization of AVX-512 features.][71473]
2579 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2581 [71430]: https://github.com/rust-lang/rust/pull/71430
2582 [71473]: https://github.com/rust-lang/rust/issues/71473
2583 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2586 Version 1.43.0 (2020-04-23)
2587 ==========================
2591 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2592 the type inferred correctly.][68129]
2593 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2595 **Syntax only changes**
2596 - [Allow `type Foo: Ord` syntactically.][69361]
2597 - [Fuse associated and extern items up to defaultness.][69194]
2598 - [Syntactically allow `self` in all `fn` contexts.][68764]
2599 - [Merge `fn` syntax + cleanup item parsing.][68728]
2600 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2601 For example, you may now write:
2603 macro_rules! mac_trait {
2613 These are still rejected *semantically*, so you will likely receive an error but
2614 these changes can be seen and parsed by macros and
2615 conditional compilation.
2620 - [You can now pass multiple lint flags to rustc to override the previous
2621 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2622 everything in the `unused` lint group except `unused-variables` which
2623 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2624 everything in the `unused` lint group **including** `unused-variables` since
2625 the allow flag is specified before the deny flag (and therefore overridden).
2626 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2627 if they are available on `windows-gnu`.][67429]
2628 - [rustc now buffers errors/warnings printed in JSON.][69227]
2632 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2633 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2634 respectively.][69538] **Note** These conversions are only available when `N`
2636 - [You can now use associated constants on floats and integers directly, rather
2637 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2638 `f32::NAN` with no imports.
2639 - [`u8::is_ascii` is now `const`.][68984]
2640 - [`String` now implements `AsMut<str>`.][68742]
2641 - [Added the `primitive` module to `std` and `core`.][67637] This module
2642 reexports Rust's primitive types. This is mainly useful in macros
2643 where you want avoid these types being shadowed.
2644 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2645 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2649 - [`Once::is_completed`]
2654 - [`iter::once_with`]
2658 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2659 your environment.][cargo/7823]
2660 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2661 executable path when running integration tests or benchmarks.][cargo/7697]
2662 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2663 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2667 - [Certain checks in the `const_err` lint were deemed unrelated to const
2668 evaluation][69185], and have been moved to the `unconditional_panic` and
2669 `arithmetic_overflow` lints.
2674 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2675 has been a warning since 1.36.0.
2676 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2677 led to some instances being accepted, and now correctly emits a hard error.
2679 [69340]: https://github.com/rust-lang/rust/pull/69340
2683 These changes provide no direct user facing benefits, but represent significant
2684 improvements to the internals and overall performance of `rustc` and
2687 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2688 - [Improved how rustc generates drop code.][67332]
2689 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2690 - [traits: preallocate 2 Vecs of known initial size][69022]
2691 - [Avoid exponential behaviour when relating types][68772]
2692 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2693 - [Improve performance of coherence checks][68966]
2694 - [Deduplicate types in the generator witness][68672]
2695 - [Invert control in struct_lint_level.][68725]
2697 [67332]: https://github.com/rust-lang/rust/pull/67332/
2698 [67429]: https://github.com/rust-lang/rust/pull/67429/
2699 [67637]: https://github.com/rust-lang/rust/pull/67637/
2700 [67642]: https://github.com/rust-lang/rust/pull/67642/
2701 [67878]: https://github.com/rust-lang/rust/pull/67878/
2702 [67885]: https://github.com/rust-lang/rust/pull/67885/
2703 [68129]: https://github.com/rust-lang/rust/pull/68129/
2704 [68672]: https://github.com/rust-lang/rust/pull/68672/
2705 [68725]: https://github.com/rust-lang/rust/pull/68725/
2706 [68728]: https://github.com/rust-lang/rust/pull/68728/
2707 [68738]: https://github.com/rust-lang/rust/pull/68738/
2708 [68742]: https://github.com/rust-lang/rust/pull/68742/
2709 [68764]: https://github.com/rust-lang/rust/pull/68764/
2710 [68772]: https://github.com/rust-lang/rust/pull/68772/
2711 [68943]: https://github.com/rust-lang/rust/pull/68943/
2712 [68952]: https://github.com/rust-lang/rust/pull/68952/
2713 [68966]: https://github.com/rust-lang/rust/pull/68966/
2714 [68984]: https://github.com/rust-lang/rust/pull/68984/
2715 [69022]: https://github.com/rust-lang/rust/pull/69022/
2716 [69185]: https://github.com/rust-lang/rust/pull/69185/
2717 [69194]: https://github.com/rust-lang/rust/pull/69194/
2718 [69201]: https://github.com/rust-lang/rust/pull/69201/
2719 [69227]: https://github.com/rust-lang/rust/pull/69227/
2720 [69548]: https://github.com/rust-lang/rust/pull/69548/
2721 [69256]: https://github.com/rust-lang/rust/pull/69256/
2722 [69361]: https://github.com/rust-lang/rust/pull/69361/
2723 [69366]: https://github.com/rust-lang/rust/pull/69366/
2724 [69538]: https://github.com/rust-lang/rust/pull/69538/
2725 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2726 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2727 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2728 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2729 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2730 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2731 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2732 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2735 Version 1.42.0 (2020-03-12)
2736 ==========================
2740 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2742 fn foo(words: &[&str]) {
2744 ["Hello", "World", "!", ..] => println!("Hello World!"),
2745 ["Foo", "Bar", ..] => println!("Baz"),
2746 rest => println!("{:?}", rest),
2750 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2751 that you can create an enum that has the exact layout and ABI of the type
2753 - [You can now use outer attribute procedural macros on inline modules.][64273]
2754 - [There are some *syntax-only* changes:][67131]
2755 - `default` is syntactically allowed before items in `trait` definitions.
2756 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2757 leave out their bodies in favor of `;`.
2758 - Bounds on associated types in `impl`s are now syntactically allowed
2759 (e.g. `type Foo: Ord;`).
2760 - `...` (the C-variadic type) may occur syntactically directly as the type of
2761 any function parameter.
2763 These are still rejected *semantically*, so you will likely receive an error
2764 but these changes can be seen and parsed by procedural macros and
2765 conditional compilation.
2769 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2770 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2771 - [`Option::{expect,unwrap}` and
2772 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2773 pointing to the location where they were called, rather than
2774 `core`'s internals. ][67887]
2776 \* Refer to Rust's [platform support page][platform-support-doc] for more
2777 information on Rust's tiered platform support.
2781 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2782 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2783 to implement `Sized`.][67935]
2784 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2785 - [`Layout::new` is now `const`.][66254]
2786 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2791 - [`CondVar::wait_while`]
2792 - [`CondVar::wait_timeout_while`]
2794 - [`DebugMap::value`]
2795 - [`ManuallyDrop::take`]
2797 - [`ptr::slice_from_raw_parts_mut`]
2798 - [`ptr::slice_from_raw_parts`]
2802 - [You no longer need to include `extern crate proc_macro;` to be able to
2803 `use proc_macro;` in the `2018` edition.][cargo/7700]
2807 - [`Error::description` has been deprecated, and its use will now produce a
2808 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2810 [68253]: https://github.com/rust-lang/rust/pull/68253/
2811 [68348]: https://github.com/rust-lang/rust/pull/68348/
2812 [67935]: https://github.com/rust-lang/rust/pull/67935/
2813 [68339]: https://github.com/rust-lang/rust/pull/68339/
2814 [68122]: https://github.com/rust-lang/rust/pull/68122/
2815 [64273]: https://github.com/rust-lang/rust/pull/64273/
2816 [67712]: https://github.com/rust-lang/rust/pull/67712/
2817 [67887]: https://github.com/rust-lang/rust/pull/67887/
2818 [67131]: https://github.com/rust-lang/rust/pull/67131/
2819 [67233]: https://github.com/rust-lang/rust/pull/67233/
2820 [66899]: https://github.com/rust-lang/rust/pull/66899/
2821 [66919]: https://github.com/rust-lang/rust/pull/66919/
2822 [66254]: https://github.com/rust-lang/rust/pull/66254/
2823 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2824 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2825 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2826 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2827 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2828 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2829 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2830 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2831 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2834 Version 1.41.1 (2020-02-27)
2835 ===========================
2837 * [Always check types of static items][69145]
2838 * [Always check lifetime bounds of `Copy` impls][69145]
2839 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2841 [69225]: https://github.com/rust-lang/rust/issues/69225
2842 [69145]: https://github.com/rust-lang/rust/pull/69145
2845 Version 1.41.0 (2020-01-30)
2846 ===========================
2851 - [You can now pass type parameters to foreign items when implementing
2852 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2853 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2854 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2855 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2856 - [You can now use any valid identifier in a `format_args` macro.][66847]
2857 Previously identifiers starting with an underscore were not allowed.
2858 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2859 enum variants.][66183] These are still rejected semantically, but
2860 can be seen and parsed by procedural macros and conditional compilation.
2861 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2862 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2863 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2865 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2870 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2871 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2872 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2873 - [You can now pass an arguments file passing the `@path` syntax
2874 to rustc.][66172] Note that the format differs somewhat from what is
2875 found in other tooling; please see [the documentation][argfile-docs] for
2877 - [You can now provide `--extern` flag without a path, indicating that it is
2878 available from the search path or specified with an `-L` flag.][64882]
2880 \* Refer to Rust's [platform support page][platform-support-doc] for more
2881 information on Rust's tiered platform support.
2883 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2888 - [The `core::panic` module is now stable.][66771] It was already stable
2890 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2891 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2892 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2897 - [`Result::map_or`]
2898 - [`Result::map_or_else`]
2899 - [`std::rc::Weak::weak_count`]
2900 - [`std::rc::Weak::strong_count`]
2901 - [`std::sync::Weak::weak_count`]
2902 - [`std::sync::Weak::strong_count`]
2907 - [Cargo will now document all the private items for binary crates
2908 by default.][cargo/7593]
2909 - [`cargo-install` will now reinstall the package if it detects that it is out
2910 of date.][cargo/7560]
2911 - [Cargo.lock now uses a more git friendly format that should help to reduce
2912 merge conflicts.][cargo/7579]
2913 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2914 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2915 optimisation level to `2` for debug builds. You can also use
2916 `[profile.<profile>.build-override]` to override build scripts and
2922 - [You can now specify `edition` in documentation code blocks to compile the block
2923 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2924 should be compiled the 2018 edition of Rust.
2925 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2926 current theme with `--check-theme`.][54733]
2927 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2932 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2933 Apple targets.][apple-32bit-drop] This means that the source code is still
2934 available to build, but the targets are no longer being tested and release
2935 binaries for those platforms will no longer be distributed by the Rust project.
2936 Please refer to the linked blog post for more information.
2938 [54733]: https://github.com/rust-lang/rust/pull/54733/
2939 [61351]: https://github.com/rust-lang/rust/pull/61351/
2940 [62514]: https://github.com/rust-lang/rust/pull/62514/
2941 [67255]: https://github.com/rust-lang/rust/pull/67255/
2942 [66661]: https://github.com/rust-lang/rust/pull/66661/
2943 [66771]: https://github.com/rust-lang/rust/pull/66771/
2944 [66847]: https://github.com/rust-lang/rust/pull/66847/
2945 [66238]: https://github.com/rust-lang/rust/pull/66238/
2946 [66277]: https://github.com/rust-lang/rust/pull/66277/
2947 [66325]: https://github.com/rust-lang/rust/pull/66325/
2948 [66172]: https://github.com/rust-lang/rust/pull/66172/
2949 [66183]: https://github.com/rust-lang/rust/pull/66183/
2950 [65879]: https://github.com/rust-lang/rust/pull/65879/
2951 [65013]: https://github.com/rust-lang/rust/pull/65013/
2952 [64882]: https://github.com/rust-lang/rust/pull/64882/
2953 [64325]: https://github.com/rust-lang/rust/pull/64325/
2954 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2955 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2956 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2957 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2958 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2959 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2960 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2961 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2962 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2963 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2964 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2966 Version 1.40.0 (2019-12-19)
2967 ===========================
2971 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2972 `const` contexts.][65188] e.g.
2975 pub struct Point(i32, i32);
2977 const ORIGIN: Point = {
2978 let constructor = Point;
2984 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2985 indicate that there may be variants or fields added in the future.][64639]
2986 For example this requires adding a wild-card branch (`_ => {}`) to any match
2987 statements on a non-exhaustive `enum`. [(RFC 2008)]
2988 - [You can now use function-like procedural macros in `extern` blocks and in
2989 type positions.][63931] e.g. `type Generated = macro!();`
2990 - [Function-like and attribute procedural macros can now emit
2991 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2992 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2993 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2994 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2998 - [Added tier 3 support\* for the
2999 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3000 - [Added tier 3 support for the
3001 `aarch64-unknown-none-softfloat` target.][64589]
3002 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3003 `mips64el-unknown-linux-muslabi64` targets.][65843]
3005 \* Refer to Rust's [platform support page][platform-support-doc] for more
3006 information on Rust's tiered platform support.
3010 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3014 - [`BTreeMap::get_key_value`]
3015 - [`HashMap::get_key_value`]
3016 - [`Option::as_deref_mut`]
3017 - [`Option::as_deref`]
3018 - [`Option::flatten`]
3019 - [`UdpSocket::peer_addr`]
3020 - [`f32::to_be_bytes`]
3021 - [`f32::to_le_bytes`]
3022 - [`f32::to_ne_bytes`]
3023 - [`f64::to_be_bytes`]
3024 - [`f64::to_le_bytes`]
3025 - [`f64::to_ne_bytes`]
3026 - [`f32::from_be_bytes`]
3027 - [`f32::from_le_bytes`]
3028 - [`f32::from_ne_bytes`]
3029 - [`f64::from_be_bytes`]
3030 - [`f64::from_le_bytes`]
3031 - [`f64::from_ne_bytes`]
3038 - [Cargo will now always display warnings, rather than only on
3039 fresh builds.][cargo/7450]
3040 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3041 now produce an error.][cargo/7507] Previously these flags were ignored.
3042 - [You can now publish `dev-dependencies` without including
3043 a `version`.][cargo/7333]
3047 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3048 when running documentation tests with `rustdoc`.][63803]
3052 - [As previously announced, any previous NLL warnings in the 2015 edition are
3053 now hard errors.][64221]
3054 - [The `include!` macro will now warn if it failed to include the
3055 entire file.][64284] The `include!` macro unintentionally only includes the
3056 first _expression_ in a file, and this can be unintuitive. This will become
3057 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3058 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3059 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3060 or `extern` blocks now correctly emits a hard error.
3062 [65294]: https://github.com/rust-lang/rust/pull/65294/
3063 [66103]: https://github.com/rust-lang/rust/pull/66103/
3064 [65843]: https://github.com/rust-lang/rust/pull/65843/
3065 [65188]: https://github.com/rust-lang/rust/pull/65188/
3066 [65092]: https://github.com/rust-lang/rust/pull/65092/
3067 [64589]: https://github.com/rust-lang/rust/pull/64589/
3068 [64639]: https://github.com/rust-lang/rust/pull/64639/
3069 [64221]: https://github.com/rust-lang/rust/pull/64221/
3070 [64284]: https://github.com/rust-lang/rust/pull/64284/
3071 [63931]: https://github.com/rust-lang/rust/pull/63931/
3072 [64035]: https://github.com/rust-lang/rust/pull/64035/
3073 [63674]: https://github.com/rust-lang/rust/pull/63674/
3074 [63803]: https://github.com/rust-lang/rust/pull/63803/
3075 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3076 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3077 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3078 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3079 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3080 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3081 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3082 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3083 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3084 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3085 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3086 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3087 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3088 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3089 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3090 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3091 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3092 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3093 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3094 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3095 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3096 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3097 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3098 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3099 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3102 Version 1.39.0 (2019-11-07)
3103 ===========================
3107 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3108 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3109 - [You can now use certain attributes on function, closure, and function pointer
3110 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3111 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3112 attributes applied to items. e.g.
3115 #[cfg(windows)] slice: &[u16],
3116 #[cfg(not(windows))] slice: &[u8],
3121 - [You can now take shared references to bind-by-move patterns in the `if` guards
3122 of `match` arms.][63118] e.g.
3125 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3129 // ---- `nums` is bound by move.
3130 if nums.iter().sum::<u8>() == 10
3131 // ^------ `.iter()` implicitly takes a reference to `nums`.
3134 // ----------- Legal as `nums` was bound by move and so we have ownership.
3136 _ => unreachable!(),
3145 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3146 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3147 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3148 **Note** Cargo currently doesn't use this feature. Refer to
3149 [cargo#7315][cargo/7315] to track this feature's progress.
3150 - [You can now pass `--show-output` argument to test binaries to print the
3151 output of successful tests.][62600]
3154 \* Refer to Rust's [platform support page][platform-support-doc] for more
3155 information on Rust's tiered platform support.
3159 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3160 - [`LinkedList::new` is now a `const` function.][63684]
3161 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3162 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3163 now `const`.][63786]
3167 - [`Pin::into_inner`]
3168 - [`Instant::checked_duration_since`]
3169 - [`Instant::saturating_duration_since`]
3173 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3174 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3175 `--all` is now deprecated.
3179 - [You can now pass `-Clinker` to rustdoc to control the linker used
3180 for compiling doctests.][63834]
3184 - [Code that was previously accepted by the old borrow checker, but rejected by
3185 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3186 previously a warning, and will also become a hard error in the Rust 2015
3187 edition in the 1.40.0 release.
3188 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3189 run tests.][63827] This should improve performance when running a large
3191 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3192 recommended to use the `?` operator instead.
3193 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3196 [62600]: https://github.com/rust-lang/rust/pull/62600/
3197 [62672]: https://github.com/rust-lang/rust/pull/62672/
3198 [63118]: https://github.com/rust-lang/rust/pull/63118/
3199 [63209]: https://github.com/rust-lang/rust/pull/63209/
3200 [63402]: https://github.com/rust-lang/rust/pull/63402/
3201 [63565]: https://github.com/rust-lang/rust/pull/63565/
3202 [63595]: https://github.com/rust-lang/rust/pull/63595/
3203 [63684]: https://github.com/rust-lang/rust/pull/63684/
3204 [63698]: https://github.com/rust-lang/rust/pull/63698/
3205 [63770]: https://github.com/rust-lang/rust/pull/63770/
3206 [63786]: https://github.com/rust-lang/rust/pull/63786/
3207 [63827]: https://github.com/rust-lang/rust/pull/63827/
3208 [63834]: https://github.com/rust-lang/rust/pull/63834/
3209 [64010]: https://github.com/rust-lang/rust/pull/64010/
3210 [64028]: https://github.com/rust-lang/rust/pull/64028/
3211 [64334]: https://github.com/rust-lang/rust/pull/64334/
3212 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3213 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3214 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3215 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3216 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3217 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3219 Version 1.38.0 (2019-09-26)
3220 ==========================
3224 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3225 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3229 - [Added pipelined compilation support to `rustc`.][62766] This will
3230 improve compilation times in some cases. For further information please refer
3231 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3232 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3233 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3234 `x86_64-uwp-windows-msvc` targets.][60260]
3235 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3236 `armv7-unknown-linux-musleabi` targets.][63107]
3237 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3238 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3239 - [Upgraded to LLVM 9.][62592]
3241 \* Refer to Rust's [platform support page][platform-support-doc] for more
3242 information on Rust's tiered platform support.
3246 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3247 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3248 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3249 is available at `std::clone::Clone`). This also makes all built-in macros
3250 available in `std`/`core` root. e.g. `std::include_bytes!`.
3251 - [`str::Chars` now implements `Debug`.][63000]
3252 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3253 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3254 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3255 - [Added euclidean remainder and division operations (`div_euclid`,
3256 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3257 `overflowing`, and `wrapping` versions are available for all
3259 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3260 `PartialEq`.][61491]
3261 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3265 - [`<*const T>::cast`]
3266 - [`<*mut T>::cast`]
3267 - [`Duration::as_secs_f32`]
3268 - [`Duration::as_secs_f64`]
3269 - [`Duration::div_f32`]
3270 - [`Duration::div_f64`]
3271 - [`Duration::from_secs_f32`]
3272 - [`Duration::from_secs_f64`]
3273 - [`Duration::mul_f32`]
3274 - [`Duration::mul_f64`]
3275 - [`any::type_name`]
3279 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3280 - [You can now pass the `--features` option multiple times to enable
3281 multiple features.][cargo/7084]
3286 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3290 - [`rustc` will now warn about some incorrect uses of
3291 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3295 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3297 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3298 issues][62896] with certain crates such as libc.
3300 [60260]: https://github.com/rust-lang/rust/pull/60260/
3301 [61457]: https://github.com/rust-lang/rust/pull/61457/
3302 [61491]: https://github.com/rust-lang/rust/pull/61491/
3303 [61884]: https://github.com/rust-lang/rust/pull/61884/
3304 [61953]: https://github.com/rust-lang/rust/pull/61953/
3305 [62042]: https://github.com/rust-lang/rust/pull/62042/
3306 [62528]: https://github.com/rust-lang/rust/pull/62528/
3307 [62583]: https://github.com/rust-lang/rust/pull/62583/
3308 [62735]: https://github.com/rust-lang/rust/pull/62735/
3309 [62766]: https://github.com/rust-lang/rust/pull/62766/
3310 [62784]: https://github.com/rust-lang/rust/pull/62784/
3311 [62592]: https://github.com/rust-lang/rust/pull/62592/
3312 [62785]: https://github.com/rust-lang/rust/issues/62785/
3313 [62814]: https://github.com/rust-lang/rust/pull/62814/
3314 [62896]: https://github.com/rust-lang/rust/issues/62896/
3315 [63000]: https://github.com/rust-lang/rust/pull/63000/
3316 [63056]: https://github.com/rust-lang/rust/pull/63056/
3317 [63107]: https://github.com/rust-lang/rust/pull/63107/
3318 [63346]: https://github.com/rust-lang/rust/pull/63346/
3319 [63421]: https://github.com/rust-lang/rust/pull/63421/
3320 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3321 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3322 [63048]: https://github.com/rust-lang/rust/pull/63048
3323 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3324 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3325 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3326 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3327 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3328 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3329 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3330 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3331 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3332 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3333 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3334 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3335 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3337 Version 1.37.0 (2019-08-15)
3338 ==========================
3342 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3343 [`Box`][62228], or an [array][62235] and unused.
3344 - [You can now use the `cfg` and `cfg_attr` attributes on
3345 generic parameters.][61547]
3346 - [You can now use enum variants through type alias.][61682] e.g. You can
3347 write the following:
3349 type MyOption = Option<u8>;
3351 fn increment_or_zero(x: MyOption) -> u8 {
3353 MyOption::Some(y) => y + 1,
3354 MyOption::None => 0,
3358 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3359 `const _: u32 = 5;`.
3360 - [You can now use `#[repr(align(X)]` on enums.][61229]
3361 - [The `?` Kleene macro operator is now available in the
3362 2015 edition.][60932]
3366 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3367 and `-C profile-use` flags.][61268] For more information on how to use profile
3368 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3369 - [The `rust-lldb` wrapper script should now work again.][61827]
3373 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3377 - [`BufReader::buffer`]
3378 - [`BufWriter::buffer`]
3379 - [`Cell::from_mut`]
3380 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3381 - [`DoubleEndedIterator::nth_back`]
3383 - [`Wrapping::reverse_bits`]
3384 - [`i128::reverse_bits`]
3385 - [`i16::reverse_bits`]
3386 - [`i32::reverse_bits`]
3387 - [`i64::reverse_bits`]
3388 - [`i8::reverse_bits`]
3389 - [`isize::reverse_bits`]
3390 - [`slice::copy_within`]
3391 - [`u128::reverse_bits`]
3392 - [`u16::reverse_bits`]
3393 - [`u32::reverse_bits`]
3394 - [`u64::reverse_bits`]
3395 - [`u8::reverse_bits`]
3396 - [`usize::reverse_bits`]
3400 - [`Cargo.lock` files are now included by default when publishing executable crates
3401 with executables.][cargo/7026]
3402 - [You can now specify `default-run="foo"` in `[package]` to specify the
3403 default executable to use for `cargo run`.][cargo/7056]
3410 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3411 Please transition your code to using the `..=` syntax for inclusive
3413 - [Using a trait object without the `dyn` will now warn by default.][61203]
3414 Please transition your code to use `dyn Trait` for trait objects instead.
3416 [62228]: https://github.com/rust-lang/rust/pull/62228/
3417 [62235]: https://github.com/rust-lang/rust/pull/62235/
3418 [61802]: https://github.com/rust-lang/rust/pull/61802/
3419 [61827]: https://github.com/rust-lang/rust/pull/61827/
3420 [61547]: https://github.com/rust-lang/rust/pull/61547/
3421 [61682]: https://github.com/rust-lang/rust/pull/61682/
3422 [61268]: https://github.com/rust-lang/rust/pull/61268/
3423 [61342]: https://github.com/rust-lang/rust/pull/61342/
3424 [61347]: https://github.com/rust-lang/rust/pull/61347/
3425 [61100]: https://github.com/rust-lang/rust/pull/61100/
3426 [61203]: https://github.com/rust-lang/rust/pull/61203/
3427 [61229]: https://github.com/rust-lang/rust/pull/61229/
3428 [60932]: https://github.com/rust-lang/rust/pull/60932/
3429 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3430 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3431 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3432 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3433 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3434 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3435 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3436 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3437 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3438 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3439 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3440 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3441 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3442 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3443 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3444 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3445 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3446 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3447 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3448 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3449 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3450 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3451 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3454 Version 1.36.0 (2019-07-04)
3455 ==========================
3459 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3460 - [The order of traits in trait objects no longer affects the semantics of that
3461 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3462 `dyn fmt::Debug + Send`, where this was previously not the case.
3466 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3467 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3468 - [`mem::needs_drop` is now available as a const fn.][60364]
3469 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3470 - [`String` now implements `BorrowMut<str>`.][60404]
3471 - [`io::Cursor` now implements `Default`.][60234]
3472 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3473 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3474 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3475 environment has access to heap memory allocation.
3476 - [`String` now implements `From<&String>`.][59825]
3477 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3478 return a tuple of each argument when there is multiple arguments.
3479 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3484 - [`VecDeque::rotate_left`]
3485 - [`VecDeque::rotate_right`]
3486 - [`Iterator::copied`]
3488 - [`io::IoSliceMut`]
3489 - [`Read::read_vectored`]
3490 - [`Write::write_vectored`]
3491 - [`str::as_mut_ptr`]
3492 - [`mem::MaybeUninit`]
3493 - [`pointer::align_offset`]
3494 - [`future::Future`]
3496 - [`task::RawWaker`]
3497 - [`task::RawWakerVTable`]
3503 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3504 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3506 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3510 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3517 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3518 longer recommended, and will be deprecated in 1.39.0.
3520 [60318]: https://github.com/rust-lang/rust/pull/60318/
3521 [60364]: https://github.com/rust-lang/rust/pull/60364/
3522 [60370]: https://github.com/rust-lang/rust/pull/60370/
3523 [60404]: https://github.com/rust-lang/rust/pull/60404/
3524 [60234]: https://github.com/rust-lang/rust/pull/60234/
3525 [60244]: https://github.com/rust-lang/rust/pull/60244/
3526 [58623]: https://github.com/rust-lang/rust/pull/58623/
3527 [59648]: https://github.com/rust-lang/rust/pull/59648/
3528 [59675]: https://github.com/rust-lang/rust/pull/59675/
3529 [59825]: https://github.com/rust-lang/rust/pull/59825/
3530 [59826]: https://github.com/rust-lang/rust/pull/59826/
3531 [59445]: https://github.com/rust-lang/rust/pull/59445/
3532 [59114]: https://github.com/rust-lang/rust/pull/59114/
3533 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3534 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3535 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3536 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3537 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3538 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3539 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3540 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3541 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3542 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3543 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3544 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3545 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3546 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3547 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3548 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3549 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3550 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3551 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3552 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3555 Version 1.35.0 (2019-05-23)
3556 ==========================
3560 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3561 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3562 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3564 unsafe fn call_unsafe(func: unsafe fn()) {
3569 unsafe { call_unsafe(|| {}); }
3576 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3577 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3578 - [Added the `wasm32-unknown-wasi` target.][59464]
3583 - [`Thread` will now show its ID in `Debug` output.][59460]
3584 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3585 - [`alloc::System` now implements `Default`.][59451]
3586 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3588 - [`char::{ToLowercase, ToUppercase}` now
3589 implement `ExactSizeIterator`.][58778]
3590 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3591 - [Removed the `Read` trait bounds
3592 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3593 - [You can now call the `dbg!` macro without any parameters to print the file
3594 and line where it is called.][57847]
3595 - [In place ASCII case conversions are now up to 4× faster.][59283]
3596 e.g. `str::make_ascii_lowercase`
3597 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3604 - [`RefCell::replace_with`]
3605 - [`RefCell::map_split`]
3607 - [`Range::contains`]
3608 - [`RangeFrom::contains`]
3609 - [`RangeTo::contains`]
3610 - [`RangeInclusive::contains`]
3611 - [`RangeToInclusive::contains`]
3612 - [`Option::copied`]
3616 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3617 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3622 - [The Rust toolchain is now available natively for musl based distros.][58575]
3624 [59460]: https://github.com/rust-lang/rust/pull/59460/
3625 [59464]: https://github.com/rust-lang/rust/pull/59464/
3626 [59500]: https://github.com/rust-lang/rust/pull/59500/
3627 [59512]: https://github.com/rust-lang/rust/pull/59512/
3628 [59580]: https://github.com/rust-lang/rust/pull/59580/
3629 [59283]: https://github.com/rust-lang/rust/pull/59283/
3630 [59451]: https://github.com/rust-lang/rust/pull/59451/
3631 [59076]: https://github.com/rust-lang/rust/pull/59076/
3632 [58778]: https://github.com/rust-lang/rust/pull/58778/
3633 [58717]: https://github.com/rust-lang/rust/pull/58717/
3634 [58369]: https://github.com/rust-lang/rust/pull/58369/
3635 [58423]: https://github.com/rust-lang/rust/pull/58423/
3636 [58080]: https://github.com/rust-lang/rust/pull/58080/
3637 [57847]: https://github.com/rust-lang/rust/pull/57847/
3638 [58575]: https://github.com/rust-lang/rust/pull/58575
3639 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3640 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3641 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3642 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3643 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3644 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3645 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3646 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3647 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3648 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3649 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3650 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3652 Version 1.34.2 (2019-05-14)
3653 ===========================
3655 * [Destabilize the `Error::type_id` function due to a security
3656 vulnerability][60785] ([CVE-2019-12083])
3658 [60785]: https://github.com/rust-lang/rust/pull/60785
3659 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3661 Version 1.34.1 (2019-04-25)
3662 ===========================
3664 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3665 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3666 * [Fix Clippy panic when checking some macros][clippy/3805]
3668 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3669 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3670 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3672 Version 1.34.0 (2019-04-11)
3673 ==========================
3677 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3678 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3680 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3681 `#[attr{}]` procedural macros.][57367]
3682 - [You can now write `extern crate self as foo;`][57407] to import your
3683 crate's root into the extern prelude.
3688 - [You can now target `riscv64imac-unknown-none-elf` and
3689 `riscv64gc-unknown-none-elf`.][58406]
3690 - [You can now enable linker plugin LTO optimisations with
3691 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3692 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3694 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3699 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3700 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3701 the `Hash` trait to create an iterator.
3702 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3703 methods.][58421] Most notably you no longer require the `Ord` trait to create
3705 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3706 for all numeric types.][58044]
3707 - [Indexing a `str` is now generic over all types that
3708 implement `SliceIndex<str>`.][57604]
3709 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3710 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3711 produce a warning if their returning type is unused.
3712 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3713 `overflowing_pow` are now available for all numeric types.][57873] These are
3714 equivalent to methods such as `wrapping_add` for the `pow` operation.
3722 * [`Error::type_id`]
3723 * [`atomic::AtomicI16`]
3724 * [`atomic::AtomicI32`]
3725 * [`atomic::AtomicI64`]
3726 * [`atomic::AtomicI8`]
3727 * [`atomic::AtomicU16`]
3728 * [`atomic::AtomicU32`]
3729 * [`atomic::AtomicU64`]
3730 * [`atomic::AtomicU8`]
3731 * [`convert::Infallible`]
3732 * [`convert::TryFrom`]
3733 * [`convert::TryInto`]
3735 * [`iter::successors`]
3736 * [`num::NonZeroI128`]
3737 * [`num::NonZeroI16`]
3738 * [`num::NonZeroI32`]
3739 * [`num::NonZeroI64`]
3740 * [`num::NonZeroI8`]
3741 * [`num::NonZeroIsize`]
3742 * [`slice::sort_by_cached_key`]
3743 * [`str::escape_debug`]
3744 * [`str::escape_default`]
3745 * [`str::escape_unicode`]
3746 * [`str::split_ascii_whitespace`]
3749 * [`Instant::checked_add`]
3750 * [`Instant::checked_sub`]
3751 * [`SystemTime::checked_add`]
3752 * [`SystemTime::checked_sub`]
3756 - [You can now use alternative registries to crates.io.][cargo/6654]
3760 - [You can now use the `?` operator in your documentation tests without manually
3761 adding `fn main() -> Result<(), _> {}`.][56470]
3765 - [`Command::before_exec` is being replaced by the unsafe method
3766 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3767 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3768 can now use `const` functions in `static` variables.
3770 [58370]: https://github.com/rust-lang/rust/pull/58370/
3771 [58406]: https://github.com/rust-lang/rust/pull/58406/
3772 [58421]: https://github.com/rust-lang/rust/pull/58421/
3773 [58166]: https://github.com/rust-lang/rust/pull/58166/
3774 [58044]: https://github.com/rust-lang/rust/pull/58044/
3775 [58057]: https://github.com/rust-lang/rust/pull/58057/
3776 [58059]: https://github.com/rust-lang/rust/pull/58059/
3777 [57809]: https://github.com/rust-lang/rust/pull/57809/
3778 [57873]: https://github.com/rust-lang/rust/pull/57873/
3779 [57604]: https://github.com/rust-lang/rust/pull/57604/
3780 [57367]: https://github.com/rust-lang/rust/pull/57367/
3781 [57407]: https://github.com/rust-lang/rust/pull/57407/
3782 [57425]: https://github.com/rust-lang/rust/pull/57425/
3783 [57106]: https://github.com/rust-lang/rust/pull/57106/
3784 [56470]: https://github.com/rust-lang/rust/pull/56470/
3785 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3786 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3787 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3788 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3789 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3790 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3791 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3792 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3793 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3794 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3795 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3796 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3797 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3798 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3799 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3800 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3801 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3802 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3803 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3804 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3805 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3806 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3807 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3808 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3809 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3810 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3811 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3812 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3813 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3814 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3815 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3818 Version 1.33.0 (2019-02-28)
3819 ==========================
3823 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3824 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3825 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3826 E.g. You can have match statement on a `u8` that covers `0..=255` and
3827 you would no longer be required to have a `_ => unreachable!()` case.
3828 - [You can now have multiple patterns in `if let` and `while let`
3829 expressions.][57532] You can do this with the same syntax as a `match`
3839 let state = Creature::Crab("Ferris");
3841 if let Creature::Crab(name) | Creature::Person(name) = state {
3842 println!("This creature's name is: {}", name);
3846 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3847 this feature will by default produce a warning as this behaviour can be
3848 unintuitive. E.g. `if let _ = 5 {}`
3849 - [You can now use `let` bindings, assignments, expression statements,
3850 and irrefutable pattern destructuring in const functions.][57175]
3851 - [You can now call unsafe const functions.][57067] E.g.
3853 const unsafe fn foo() -> i32 { 5 }
3854 const fn bar() -> i32 {
3858 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3859 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3860 - [You can now specify a specific alignment with the `#[repr(packed)]`
3861 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3862 with an alignment of 2 bytes and a size of 6 bytes.
3863 - [You can now import an item from a module as an `_`.][56303] This allows you to
3864 import a trait's impls, and not have the name in the namespace. E.g.
3866 use std::io::Read as _;
3868 // Allowed as there is only one `Read` in the module.
3871 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3875 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3876 command line argument.][56351]
3877 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3878 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3879 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3880 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3881 information on Rust's platform support.
3882 - [Added support for the `thumbv7neon-linux-androideabi` and
3883 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3884 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3888 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3889 functions for all numeric types.][57566]
3890 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3891 are now `const` functions for all numeric types.][57105]
3892 - [The methods `is_positive` and `is_negative` are now `const` functions for
3893 all signed numeric types.][57105]
3894 - [The `get` method for all `NonZero` types is now `const`.][57167]
3895 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3896 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3897 numeric types.][57234]
3898 - [`Ipv4Addr::new` is now a `const` function][57234]
3902 - [`unix::FileExt::read_exact_at`]
3903 - [`unix::FileExt::write_all_at`]
3904 - [`Option::transpose`]
3905 - [`Result::transpose`]
3906 - [`convert::identity`]
3909 - [`marker::PhantomPinned`]
3910 - [`Vec::resize_with`]
3911 - [`VecDeque::resize_with`]
3912 - [`Duration::as_millis`]
3913 - [`Duration::as_micros`]
3914 - [`Duration::as_nanos`]
3919 - [You can now publish crates that require a feature flag to compile with
3920 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3921 - [Cargo should now rebuild a crate if a file was modified during the initial
3926 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3927 are now deprecated in the standard library, and their usage will now produce a warning.
3928 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3930 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3932 - [Libtest no longer creates a new thread for each test when
3933 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3935 [56243]: https://github.com/rust-lang/rust/pull/56243
3936 [56303]: https://github.com/rust-lang/rust/pull/56303/
3937 [56351]: https://github.com/rust-lang/rust/pull/56351/
3938 [56362]: https://github.com/rust-lang/rust/pull/56362
3939 [56642]: https://github.com/rust-lang/rust/pull/56642/
3940 [56769]: https://github.com/rust-lang/rust/pull/56769/
3941 [56805]: https://github.com/rust-lang/rust/pull/56805
3942 [56947]: https://github.com/rust-lang/rust/pull/56947/
3943 [57049]: https://github.com/rust-lang/rust/pull/57049/
3944 [57067]: https://github.com/rust-lang/rust/pull/57067/
3945 [57105]: https://github.com/rust-lang/rust/pull/57105
3946 [57130]: https://github.com/rust-lang/rust/pull/57130/
3947 [57167]: https://github.com/rust-lang/rust/pull/57167/
3948 [57175]: https://github.com/rust-lang/rust/pull/57175/
3949 [57234]: https://github.com/rust-lang/rust/pull/57234/
3950 [57332]: https://github.com/rust-lang/rust/pull/57332/
3951 [57465]: https://github.com/rust-lang/rust/pull/57465/
3952 [57532]: https://github.com/rust-lang/rust/pull/57532/
3953 [57535]: https://github.com/rust-lang/rust/pull/57535/
3954 [57566]: https://github.com/rust-lang/rust/pull/57566/
3955 [57615]: https://github.com/rust-lang/rust/pull/57615/
3956 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3957 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3958 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3959 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3960 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3961 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3962 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3963 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3964 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3965 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3966 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3967 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3968 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3969 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3970 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3971 [platform-support]: https://forge.rust-lang.org/platform-support.html
3973 Version 1.32.0 (2019-01-17)
3974 ==========================
3979 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3980 operator allows you to specify zero or one repetitions similar to the `*` and
3982 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3983 now always resolve to the item (`enum`, `struct`, etc.) available in the
3984 module if present, before resolving to a external crate or an item the prelude.][56759]
3987 enum Color { Red, Green, Blue }
3993 - [You can now match against `PhantomData<T>` types.][55837]
3994 - [You can now match against literals in macros with the `literal`
3995 specifier.][56072] This will match against a literal of any type.
3996 E.g. `1`, `'A'`, `"Hello World"`
3997 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3999 struct Point(i32, i32);
4002 pub fn new(x: i32, y: i32) -> Self {
4006 pub fn is_origin(&self) -> bool {
4014 - [Self can also now be used in type definitions.][56366] E.g.
4018 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4021 Cons(T, Box<Self>) // likewise here
4024 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4025 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4029 - [The default allocator has changed from jemalloc to the default allocator on
4030 your system.][55238] The compiler itself on Linux & macOS will still use
4031 jemalloc, but programs compiled with it will use the system allocator.
4032 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4036 - [`PathBuf` now implements `FromStr`.][55148]
4037 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4038 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4039 easily debug expressions in your rust program. E.g.
4042 let b = dbg!(a * 2) + 1;
4043 // ^-- prints: [src/main.rs:4] a * 2 = 4
4047 The following APIs are now `const` functions and can be used in a
4051 - [`UnsafeCell::get`]
4052 - [`char::is_ascii`]
4054 - [`ManuallyDrop::new`]
4055 - [`ManuallyDrop::into_inner`]
4056 - [`RangeInclusive::start`]
4057 - [`RangeInclusive::end`]
4058 - [`NonNull::as_ptr`]
4061 - [`Duration::as_secs`]
4062 - [`Duration::subsec_millis`]
4063 - [`Duration::subsec_micros`]
4064 - [`Duration::subsec_nanos`]
4066 - [`Ipv4Addr::is_unspecified`]
4068 - [`Ipv6Addr::octets`]
4072 - [`i8::to_be_bytes`]
4073 - [`i8::to_le_bytes`]
4074 - [`i8::to_ne_bytes`]
4075 - [`i8::from_be_bytes`]
4076 - [`i8::from_le_bytes`]
4077 - [`i8::from_ne_bytes`]
4078 - [`i16::to_be_bytes`]
4079 - [`i16::to_le_bytes`]
4080 - [`i16::to_ne_bytes`]
4081 - [`i16::from_be_bytes`]
4082 - [`i16::from_le_bytes`]
4083 - [`i16::from_ne_bytes`]
4084 - [`i32::to_be_bytes`]
4085 - [`i32::to_le_bytes`]
4086 - [`i32::to_ne_bytes`]
4087 - [`i32::from_be_bytes`]
4088 - [`i32::from_le_bytes`]
4089 - [`i32::from_ne_bytes`]
4090 - [`i64::to_be_bytes`]
4091 - [`i64::to_le_bytes`]
4092 - [`i64::to_ne_bytes`]
4093 - [`i64::from_be_bytes`]
4094 - [`i64::from_le_bytes`]
4095 - [`i64::from_ne_bytes`]
4096 - [`i128::to_be_bytes`]
4097 - [`i128::to_le_bytes`]
4098 - [`i128::to_ne_bytes`]
4099 - [`i128::from_be_bytes`]
4100 - [`i128::from_le_bytes`]
4101 - [`i128::from_ne_bytes`]
4102 - [`isize::to_be_bytes`]
4103 - [`isize::to_le_bytes`]
4104 - [`isize::to_ne_bytes`]
4105 - [`isize::from_be_bytes`]
4106 - [`isize::from_le_bytes`]
4107 - [`isize::from_ne_bytes`]
4108 - [`u8::to_be_bytes`]
4109 - [`u8::to_le_bytes`]
4110 - [`u8::to_ne_bytes`]
4111 - [`u8::from_be_bytes`]
4112 - [`u8::from_le_bytes`]
4113 - [`u8::from_ne_bytes`]
4114 - [`u16::to_be_bytes`]
4115 - [`u16::to_le_bytes`]
4116 - [`u16::to_ne_bytes`]
4117 - [`u16::from_be_bytes`]
4118 - [`u16::from_le_bytes`]
4119 - [`u16::from_ne_bytes`]
4120 - [`u32::to_be_bytes`]
4121 - [`u32::to_le_bytes`]
4122 - [`u32::to_ne_bytes`]
4123 - [`u32::from_be_bytes`]
4124 - [`u32::from_le_bytes`]
4125 - [`u32::from_ne_bytes`]
4126 - [`u64::to_be_bytes`]
4127 - [`u64::to_le_bytes`]
4128 - [`u64::to_ne_bytes`]
4129 - [`u64::from_be_bytes`]
4130 - [`u64::from_le_bytes`]
4131 - [`u64::from_ne_bytes`]
4132 - [`u128::to_be_bytes`]
4133 - [`u128::to_le_bytes`]
4134 - [`u128::to_ne_bytes`]
4135 - [`u128::from_be_bytes`]
4136 - [`u128::from_le_bytes`]
4137 - [`u128::from_ne_bytes`]
4138 - [`usize::to_be_bytes`]
4139 - [`usize::to_le_bytes`]
4140 - [`usize::to_ne_bytes`]
4141 - [`usize::from_be_bytes`]
4142 - [`usize::from_le_bytes`]
4143 - [`usize::from_ne_bytes`]
4147 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4148 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4152 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4156 - [The argument types for AVX's
4157 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4158 been changed from `*const` to `*mut` as the previous implementation
4162 [55148]: https://github.com/rust-lang/rust/pull/55148/
4163 [55238]: https://github.com/rust-lang/rust/pull/55238/
4164 [55280]: https://github.com/rust-lang/rust/pull/55280/
4165 [55610]: https://github.com/rust-lang/rust/pull/55610/
4166 [55663]: https://github.com/rust-lang/rust/pull/55663/
4167 [55702]: https://github.com/rust-lang/rust/pull/55702/
4168 [55837]: https://github.com/rust-lang/rust/pull/55837/
4169 [55843]: https://github.com/rust-lang/rust/pull/55843/
4170 [56072]: https://github.com/rust-lang/rust/pull/56072/
4171 [56245]: https://github.com/rust-lang/rust/pull/56245/
4172 [56365]: https://github.com/rust-lang/rust/pull/56365/
4173 [56366]: https://github.com/rust-lang/rust/pull/56366/
4174 [56395]: https://github.com/rust-lang/rust/pull/56395/
4175 [56759]: https://github.com/rust-lang/rust/pull/56759/
4176 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4177 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4178 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4179 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4180 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4181 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4182 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4183 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4184 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4185 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4186 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4187 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4188 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4189 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4190 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4191 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4192 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4193 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4194 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4195 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4196 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4197 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4198 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4199 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4200 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4201 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4202 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4203 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4204 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4205 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4206 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4207 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4208 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4209 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4210 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4211 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4212 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4213 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4214 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4215 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4216 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4217 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4218 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4219 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4220 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4221 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4222 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4223 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4224 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4225 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4226 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4227 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4228 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4229 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4230 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4231 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4232 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4233 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4234 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4235 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4236 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4237 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4238 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4239 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4240 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4241 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4242 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4243 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4244 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4245 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4246 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4247 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4248 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4249 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4250 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4251 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4252 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4253 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4254 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4255 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4256 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4257 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4258 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4259 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4260 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4261 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4262 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4263 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4264 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4265 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4266 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4267 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4268 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4271 Version 1.31.1 (2018-12-20)
4272 ===========================
4274 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4275 - [Fix broken go-to-definition in RLS][rls/1171]
4276 - [Fix infinite loop on hover in RLS][rls/1170]
4278 [56562]: https://github.com/rust-lang/rust/pull/56562
4279 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4280 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4282 Version 1.31.0 (2018-12-06)
4283 ==========================
4287 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4288 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4289 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4290 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4292 - [You can now define and use `const` functions.][54835] These are currently
4293 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4294 [language reference][const-reference] for what exactly is available.
4295 - [You can now use tool lints, which allow you to scope lints from external
4296 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4297 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4298 a crate, not just in exported functions.][54451]
4299 - [You can now use parentheses in pattern matches.][54497]
4303 - [Updated musl to 1.1.20][54430]
4307 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4308 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4309 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4310 into `Option<&mut T>` using the `From` trait.][53218]
4311 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4316 - [`slice::align_to`]
4317 - [`slice::align_to_mut`]
4318 - [`slice::chunks_exact`]
4319 - [`slice::chunks_exact_mut`]
4320 - [`slice::rchunks`]
4321 - [`slice::rchunks_mut`]
4322 - [`slice::rchunks_exact`]
4323 - [`slice::rchunks_exact_mut`]
4324 - [`Option::replace`]
4328 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4329 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4330 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4332 [52813]: https://github.com/rust-lang/rust/pull/52813/
4333 [53218]: https://github.com/rust-lang/rust/pull/53218/
4334 [54057]: https://github.com/rust-lang/rust/pull/54057/
4335 [54240]: https://github.com/rust-lang/rust/pull/54240/
4336 [54430]: https://github.com/rust-lang/rust/pull/54430/
4337 [54451]: https://github.com/rust-lang/rust/pull/54451/
4338 [54497]: https://github.com/rust-lang/rust/pull/54497/
4339 [54778]: https://github.com/rust-lang/rust/pull/54778/
4340 [54835]: https://github.com/rust-lang/rust/pull/54835/
4341 [54870]: https://github.com/rust-lang/rust/pull/54870/
4342 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4343 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4344 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4345 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4346 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4347 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4348 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4349 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4350 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4351 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4352 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4353 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4354 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4355 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4357 Version 1.30.1 (2018-11-08)
4358 ===========================
4360 - [Fixed overflow ICE in rustdoc][54199]
4361 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4363 [54199]: https://github.com/rust-lang/rust/pull/54199
4364 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4366 Version 1.30.0 (2018-10-25)
4367 ==========================
4371 - [Procedural macros are now available.][52081] These kinds of macros allow for
4372 more powerful code generation. There is a [new chapter available][proc-macros]
4373 in the Rust Programming Language book that goes further in depth.
4374 - [You can now use keywords as identifiers using the raw identifiers
4375 syntax (`r#`),][53236] e.g. `let r#for = true;`
4376 - [Using anonymous parameters in traits is now deprecated with a warning and
4377 will be a hard error in the 2018 edition.][53272]
4378 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4379 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4380 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4381 Previously, using a external crate in a module without a use statement
4382 required `let json = ::serde_json::from_str(foo);` but can now be written
4383 as `let json = serde_json::from_str(foo);`.
4384 - [You can now apply the `#[used]` attribute to static items to prevent the
4385 compiler from optimising them away, even if they appear to be unused,][51363]
4386 e.g. `#[used] static FOO: u32 = 1;`
4387 - [You can now import and reexport macros from other crates with the `use`
4388 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4389 the root module of the crate. If your macro relies on calling other local
4390 macros, it is recommended to export with the
4391 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4393 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4394 using the `vis` specifier.][53370]
4395 - [Non-macro attributes now allow all forms of literals, not just
4396 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4397 write `#[attr(true)]`.
4398 - [You can now specify a function to handle a panic in the Rust runtime with the
4399 `#[panic_handler]` attribute.][51366]
4403 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4404 - [Added the `aarch64-unknown-netbsd` target][53165]
4405 - [Upgraded to LLVM 8.][53611]
4409 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4413 - [`Ipv4Addr::BROADCAST`]
4414 - [`Ipv4Addr::LOCALHOST`]
4415 - [`Ipv4Addr::UNSPECIFIED`]
4416 - [`Ipv6Addr::LOCALHOST`]
4417 - [`Ipv6Addr::UNSPECIFIED`]
4418 - [`Iterator::find_map`]
4420 The following methods are replacement methods for `trim_left`, `trim_right`,
4421 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4423 - [`str::trim_end_matches`]
4425 - [`str::trim_start_matches`]
4426 - [`str::trim_start`]
4430 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4431 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4432 equivalent to calling `rustdoc --error-format=json`.
4433 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4437 - [`rustdoc` allows you to specify what edition to treat your code as with the
4438 `--edition` option.][54057]
4439 - [`rustdoc` now has the `--color` (specify whether to output color) and
4440 `--error-format` (specify error format, e.g. `json`) options.][53003]
4441 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4442 debug symbols.][53774]
4443 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4444 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4446 [50911]: https://github.com/rust-lang/rust/pull/50911/
4447 [51363]: https://github.com/rust-lang/rust/pull/51363/
4448 [51366]: https://github.com/rust-lang/rust/pull/51366/
4449 [52081]: https://github.com/rust-lang/rust/pull/52081/
4450 [53003]: https://github.com/rust-lang/rust/pull/53003/
4451 [53033]: https://github.com/rust-lang/rust/pull/53033/
4452 [53044]: https://github.com/rust-lang/rust/pull/53044/
4453 [53165]: https://github.com/rust-lang/rust/pull/53165/
4454 [53611]: https://github.com/rust-lang/rust/pull/53611/
4455 [53236]: https://github.com/rust-lang/rust/pull/53236/
4456 [53272]: https://github.com/rust-lang/rust/pull/53272/
4457 [53370]: https://github.com/rust-lang/rust/pull/53370/
4458 [53459]: https://github.com/rust-lang/rust/pull/53459/
4459 [53774]: https://github.com/rust-lang/rust/pull/53774/
4460 [53822]: https://github.com/rust-lang/rust/pull/53822/
4461 [54057]: https://github.com/rust-lang/rust/pull/54057/
4462 [54404]: https://github.com/rust-lang/rust/pull/54404/
4463 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4464 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4465 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4466 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4468 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4469 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4470 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4471 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4472 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4473 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4474 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4475 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4476 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4477 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4480 Version 1.29.2 (2018-10-11)
4481 ===========================
4483 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4484 - The `rls-preview` component on the windows-gnu targets has been restored.
4486 [54639]: https://github.com/rust-lang/rust/pull/54639
4489 Version 1.29.1 (2018-09-25)
4490 ===========================
4495 - The standard library's `str::repeat` function contained an out of bounds write
4496 caused by an integer overflow. This has been fixed by deterministically
4497 panicking when an overflow happens.
4499 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4503 Version 1.29.0 (2018-09-13)
4504 ==========================
4508 - [Bumped minimum LLVM version to 5.0.][51899]
4509 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4510 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4511 - [Upgraded to LLVM 7.][51966]
4515 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4516 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4517 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4518 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4520 - [`Cell<T>` now allows `T` to be unsized.][50494]
4521 - [`SocketAddr` is now stable on Redox.][52656]
4526 - [`Iterator::flatten`]
4531 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4532 `--locked` to disable this behavior.
4533 - [`cargo-install` will now allow you to cross compile an install
4534 using `--target`.][cargo/5614]
4535 - [Added the `cargo-fix` subcommand to automatically move project code from
4536 2015 edition to 2018.][cargo/5723]
4537 - [`cargo doc` can now optionally document private types using the
4538 `--document-private-items` flag.][cargo/5543]
4542 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4543 the specified level to that level.][52354] For example `--cap-lints warn`
4544 will demote `deny` and `forbid` lints to `warn`.
4545 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4546 fails and `101` if there is a panic.][52197]
4547 - [A preview of clippy has been made available through rustup.][51122]
4548 You can install the preview with `rustup component add clippy-preview`.
4552 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4553 Use `str::get_unchecked(begin..end)` instead.
4554 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4555 Consider using the `home_dir` function from
4556 https://crates.io/crates/dirs instead.
4557 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4558 - [`cfg` attributes and `--cfg` command line flags are now more
4559 strictly validated.][53893]
4561 [53893]: https://github.com/rust-lang/rust/pull/53893/
4562 [52861]: https://github.com/rust-lang/rust/pull/52861/
4563 [51966]: https://github.com/rust-lang/rust/pull/51966/
4564 [52656]: https://github.com/rust-lang/rust/pull/52656/
4565 [52239]: https://github.com/rust-lang/rust/pull/52239/
4566 [52330]: https://github.com/rust-lang/rust/pull/52330/
4567 [52354]: https://github.com/rust-lang/rust/pull/52354/
4568 [52402]: https://github.com/rust-lang/rust/pull/52402/
4569 [52197]: https://github.com/rust-lang/rust/pull/52197/
4570 [51807]: https://github.com/rust-lang/rust/pull/51807/
4571 [51899]: https://github.com/rust-lang/rust/pull/51899/
4572 [51912]: https://github.com/rust-lang/rust/pull/51912/
4573 [51619]: https://github.com/rust-lang/rust/pull/51619/
4574 [51656]: https://github.com/rust-lang/rust/pull/51656/
4575 [51178]: https://github.com/rust-lang/rust/pull/51178/
4576 [51122]: https://github.com/rust-lang/rust/pull/51122
4577 [50494]: https://github.com/rust-lang/rust/pull/50494/
4578 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4579 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4580 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4581 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4582 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4583 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4584 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4587 Version 1.28.0 (2018-08-02)
4588 ===========================
4592 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4593 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4594 the inner type across Foreign Function Interface (FFI) boundaries.
4595 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4596 and can now be used as identifiers.][51196]
4597 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4598 stable.][51241] This will allow users to specify a global allocator for
4600 - [Unit test functions marked with the `#[test]` attribute can now return
4601 `Result<(), E: Debug>` in addition to `()`.][51298]
4602 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4603 allows macros to easily target lifetimes.
4607 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4608 prioritise making smaller binary sizes. `z` is the same as `s` with the
4609 exception that it does not vectorise loops, which typically results in an even
4611 - [The short error format is now stable.][49546] Specified with
4612 `--error-format=short` this option will provide a more compressed output of
4613 rust error messages.
4614 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4615 - [Reduced the number of allocations in the macro parser.][50855] This can
4616 improve compile times of macro heavy crates on average by 5%.
4620 - [Implemented `Default` for `&mut str`.][51306]
4621 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4622 - [Implemented `Extend` for `()`.][50234]
4623 - [The `Debug` implementation of `time::Duration` should now be more easily
4624 human readable.][50364] Previously a `Duration` of one second would printed as
4625 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4626 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4627 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4628 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4629 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4630 for `PathBuf`.][50170]
4631 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4632 and `Wrapping<i128>`.][50465]
4633 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4634 possible.][51050] This can provide up to a 40% speed increase.
4635 - [Improved error messages when using `format!`.][50610]
4639 - [`Iterator::step_by`]
4640 - [`Path::ancestors`]
4641 - [`SystemTime::UNIX_EPOCH`]
4642 - [`alloc::GlobalAlloc`]
4644 - [`alloc::LayoutErr`]
4647 - [`alloc::alloc_zeroed`]
4648 - [`alloc::dealloc`]
4649 - [`alloc::realloc`]
4650 - [`alloc::handle_alloc_error`]
4651 - [`btree_map::Entry::or_default`]
4652 - [`fmt::Alignment`]
4653 - [`hash_map::Entry::or_default`]
4654 - [`iter::repeat_with`]
4655 - [`num::NonZeroUsize`]
4656 - [`num::NonZeroU128`]
4657 - [`num::NonZeroU16`]
4658 - [`num::NonZeroU32`]
4659 - [`num::NonZeroU64`]
4660 - [`num::NonZeroU8`]
4661 - [`ops::RangeBounds`]
4662 - [`slice::SliceIndex`]
4663 - [`slice::from_mut`]
4664 - [`slice::from_ref`]
4665 - [`{Any + Send + Sync}::downcast_mut`]
4666 - [`{Any + Send + Sync}::downcast_ref`]
4667 - [`{Any + Send + Sync}::is`]
4671 - [Cargo will now no longer allow you to publish crates with build scripts that
4672 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4673 considered to be immutable.
4677 - [The `suggestion_applicability` field in `rustc`'s json output is now
4678 stable.][50486] This will allow dev tools to check whether a code suggestion
4679 would apply to them.
4683 - [Rust will consider trait objects with duplicated constraints to be the same
4684 type as without the duplicated constraint.][51276] For example the below code will
4685 now fail to compile.
4690 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4693 impl Trait + Send + Send {
4694 fn test(&self) { println!("two"); }
4698 [49546]: https://github.com/rust-lang/rust/pull/49546/
4699 [50143]: https://github.com/rust-lang/rust/pull/50143/
4700 [50170]: https://github.com/rust-lang/rust/pull/50170/
4701 [50234]: https://github.com/rust-lang/rust/pull/50234/
4702 [50265]: https://github.com/rust-lang/rust/pull/50265/
4703 [50364]: https://github.com/rust-lang/rust/pull/50364/
4704 [50385]: https://github.com/rust-lang/rust/pull/50385/
4705 [50465]: https://github.com/rust-lang/rust/pull/50465/
4706 [50486]: https://github.com/rust-lang/rust/pull/50486/
4707 [50554]: https://github.com/rust-lang/rust/pull/50554/
4708 [50610]: https://github.com/rust-lang/rust/pull/50610/
4709 [50855]: https://github.com/rust-lang/rust/pull/50855/
4710 [51050]: https://github.com/rust-lang/rust/pull/51050/
4711 [51196]: https://github.com/rust-lang/rust/pull/51196/
4712 [51241]: https://github.com/rust-lang/rust/pull/51241/
4713 [51276]: https://github.com/rust-lang/rust/pull/51276/
4714 [51298]: https://github.com/rust-lang/rust/pull/51298/
4715 [51306]: https://github.com/rust-lang/rust/pull/51306/
4716 [51562]: https://github.com/rust-lang/rust/pull/51562/
4717 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4718 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4719 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4720 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4721 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4722 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4723 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4724 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4725 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4726 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4727 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4728 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4729 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4730 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4731 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4732 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4733 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4734 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4735 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4736 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4737 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4738 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4739 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4740 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4741 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4742 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4743 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4744 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4745 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4746 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4748 Version 1.27.2 (2018-07-20)
4749 ===========================
4754 - The borrow checker was fixed to avoid potential unsoundness when using
4755 match ergonomics: [#52213][52213].
4757 [52213]: https://github.com/rust-lang/rust/issues/52213
4759 Version 1.27.1 (2018-07-10)
4760 ===========================
4765 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4766 when running, which enabled executing code as some other user on a
4767 given machine. This release fixes that vulnerability; you can read
4768 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4770 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4775 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4776 match ergonomics: [#51415][51415], [#49534][49534].
4778 [51415]: https://github.com/rust-lang/rust/issues/51415
4779 [49534]: https://github.com/rust-lang/rust/issues/49534
4780 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4781 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4783 Version 1.27.0 (2018-06-21)
4784 ==========================
4788 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4789 be used as an identifier.
4790 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4791 bare `Trait` syntax, and should make it clearer when being used in tandem with
4792 `impl Trait` because it is equivalent to the following syntax:
4793 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4794 `Box<Trait> == Box<dyn Trait>`.
4795 - [Attributes on generic parameters such as types and lifetimes are
4796 now stable.][48851] e.g.
4797 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4798 - [The `#[must_use]` attribute can now also be used on functions as well as
4799 types.][48925] It provides a lint that by default warns users when the
4800 value returned by a function has not been used.
4804 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4808 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4809 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4810 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4811 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4812 the `cfg` attribute.
4813 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4814 std are now available in core.][49896]
4815 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4817 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4818 that the operation isn't done in place.
4819 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4820 the `#[must_use]` attribute][49533] to warn about unused potentially
4821 expensive allocations.
4825 - [`DoubleEndedIterator::rfind`]
4826 - [`DoubleEndedIterator::rfold`]
4827 - [`DoubleEndedIterator::try_rfold`]
4828 - [`Duration::from_micros`]
4829 - [`Duration::from_nanos`]
4830 - [`Duration::subsec_micros`]
4831 - [`Duration::subsec_millis`]
4832 - [`HashMap::remove_entry`]
4833 - [`Iterator::try_fold`]
4834 - [`Iterator::try_for_each`]
4836 - [`Option::filter`]
4837 - [`String::replace_range`]
4838 - [`Take::set_limit`]
4839 - [`hint::unreachable_unchecked`]
4840 - [`os::unix::process::parent_id`]
4841 - [`ptr::swap_nonoverlapping`]
4842 - [`slice::rsplit_mut`]
4844 - [`slice::swap_with_slice`]
4848 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4849 `readme`, and `repository` fields.][cargo/5386]
4850 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4851 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4852 a different directory than `target` for placing compilation artifacts.
4853 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4854 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4855 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4856 where cargo would infer a binary, Cargo will produce a warning. You can
4857 disable this feature ahead of time by setting any of the following to false:
4858 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4859 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4860 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4864 - [Added “The Rustc book” into the official documentation.][49707]
4865 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4866 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4870 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4871 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4872 compile, `"".is_empty()` will still compile.
4873 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4874 will only print the inner type.][48553] E.g.
4875 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4876 not `AtomicBool(true)`.
4877 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4878 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4879 alignment should cover all use cases.
4880 - The `.description()` method on the `std::error::Error` trait
4881 [has been soft-deprecated][50163]. It is no longer required to implement it.
4883 [48553]: https://github.com/rust-lang/rust/pull/48553/
4884 [48851]: https://github.com/rust-lang/rust/pull/48851/
4885 [48925]: https://github.com/rust-lang/rust/pull/48925/
4886 [49533]: https://github.com/rust-lang/rust/pull/49533/
4887 [49623]: https://github.com/rust-lang/rust/pull/49623/
4888 [49630]: https://github.com/rust-lang/rust/pull/49630/
4889 [49664]: https://github.com/rust-lang/rust/pull/49664/
4890 [49699]: https://github.com/rust-lang/rust/pull/49699/
4891 [49707]: https://github.com/rust-lang/rust/pull/49707/
4892 [49896]: https://github.com/rust-lang/rust/pull/49896/
4893 [49968]: https://github.com/rust-lang/rust/pull/49968/
4894 [50163]: https://github.com/rust-lang/rust/pull/50163
4895 [50177]: https://github.com/rust-lang/rust/pull/50177/
4896 [50378]: https://github.com/rust-lang/rust/pull/50378/
4897 [50423]: https://github.com/rust-lang/rust/pull/50423/
4898 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4899 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4900 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4901 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4902 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4903 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4904 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4905 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4906 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4907 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4908 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4909 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4910 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4911 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4912 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4913 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4914 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4915 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4916 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4917 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4918 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4919 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4920 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4921 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4922 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4923 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4924 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4925 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4926 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4929 Version 1.26.2 (2018-06-05)
4930 ==========================
4935 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4937 [51117]: https://github.com/rust-lang/rust/issues/51117
4940 Version 1.26.1 (2018-05-29)
4941 ==========================
4946 - [RLS now works on Windows.][50646]
4947 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4953 - [`fn main() -> impl Trait` no longer works for non-Termination
4955 This reverts an accidental stabilization.
4956 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4957 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4959 [50646]: https://github.com/rust-lang/rust/issues/50646
4960 [50656]: https://github.com/rust-lang/rust/pull/50656
4961 [50812]: https://github.com/rust-lang/rust/pull/50812
4962 [50950]: https://github.com/rust-lang/rust/issues/50950
4963 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4965 Version 1.26.0 (2018-05-10)
4966 ==========================
4970 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4971 implement either or both traits.][49299]
4972 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4973 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4974 lifetime can be elided.][49458]
4975 - [`impl Trait` is now stable allowing you to have abstract types in returns
4976 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4977 `fn open(path: impl AsRef<Path>)`.
4978 - [Pattern matching will now automatically apply dereferences.][49394]
4979 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4980 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4981 - [A lot of operations are now available in a const context.][46882] E.g. You
4982 can now index into constant arrays, reference and dereference into constants,
4983 and use tuple struct constructors.
4984 - [Fixed entry slice patterns are now stable.][48516] E.g.
4986 let points = [1, 2, 3, 4];
4988 [1, 2, 3, 4] => println!("All points were sequential."),
4989 _ => println!("Not all points were sequential."),
4996 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4997 - [Fixed exponential projection complexity on nested types.][48296]
4998 This can provide up to a ~12% reduction in compile times for certain crates.
4999 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5000 to remap path prefixes outputted by the compiler.
5001 - [Added `powerpc-unknown-netbsd` target.][48281]
5005 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5006 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5007 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5008 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5009 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5010 - [`ascii::escape_default` is now available in libcore.][48735]
5011 - [Trailing commas are now supported in std and core macros.][48056]
5012 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5013 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5018 - [`*const T::copy_to_nonoverlapping`]
5019 - [`*const T::copy_to`]
5020 - [`*const T::read_unaligned`]
5021 - [`*const T::read_volatile`]
5022 - [`*const T::read`]
5024 - [`*const T::wrapping_add`]
5025 - [`*const T::wrapping_sub`]
5027 - [`*mut T::copy_to_nonoverlapping`]
5028 - [`*mut T::copy_to`]
5029 - [`*mut T::read_unaligned`]
5030 - [`*mut T::read_volatile`]
5032 - [`*mut T::replace`]
5035 - [`*mut T::wrapping_add`]
5036 - [`*mut T::wrapping_sub`]
5037 - [`*mut T::write_bytes`]
5038 - [`*mut T::write_unaligned`]
5039 - [`*mut T::write_volatile`]
5042 - [`FromUtf8Error::as_bytes`]
5043 - [`LocalKey::try_with`]
5044 - [`Option::cloned`]
5045 - [`btree_map::Entry::and_modify`]
5046 - [`fs::read_to_string`]
5049 - [`hash_map::Entry::and_modify`]
5050 - [`iter::FusedIterator`]
5051 - [`ops::RangeInclusive`]
5052 - [`ops::RangeToInclusive`]
5054 - [`slice::rotate_left`]
5055 - [`slice::rotate_right`]
5056 - [`String::retain`]
5061 - [Cargo will now output path to custom commands when `-v` is
5062 passed with `--list`][cargo/5041]
5063 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5067 - [The second edition of "The Rust Programming Language" book is now recommended
5068 over the first.][48404]
5073 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5074 syntax is now invalid.
5076 use std::ops::Fn as dyn;
5077 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5079 - [The result of dereferences are no longer promoted to `'static`.][47408]
5083 const PAIR: &(i32, i32) = &(0, 1);
5084 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5087 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5088 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5090 - [Removed hoedown from rustdoc.][48274]
5091 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5093 [46882]: https://github.com/rust-lang/rust/pull/46882
5094 [47379]: https://github.com/rust-lang/rust/pull/47379
5095 [47408]: https://github.com/rust-lang/rust/pull/47408
5096 [47813]: https://github.com/rust-lang/rust/pull/47813
5097 [48056]: https://github.com/rust-lang/rust/pull/48056
5098 [48125]: https://github.com/rust-lang/rust/pull/48125
5099 [48235]: https://github.com/rust-lang/rust/pull/48235
5100 [48274]: https://github.com/rust-lang/rust/pull/48274
5101 [48281]: https://github.com/rust-lang/rust/pull/48281
5102 [48296]: https://github.com/rust-lang/rust/pull/48296
5103 [48326]: https://github.com/rust-lang/rust/pull/48326
5104 [48359]: https://github.com/rust-lang/rust/pull/48359
5105 [48404]: https://github.com/rust-lang/rust/pull/48404
5106 [48481]: https://github.com/rust-lang/rust/pull/48481
5107 [48516]: https://github.com/rust-lang/rust/pull/48516
5108 [48628]: https://github.com/rust-lang/rust/pull/48628
5109 [48629]: https://github.com/rust-lang/rust/pull/48629
5110 [48657]: https://github.com/rust-lang/rust/pull/48657
5111 [48735]: https://github.com/rust-lang/rust/pull/48735
5112 [48978]: https://github.com/rust-lang/rust/pull/48978
5113 [49101]: https://github.com/rust-lang/rust/pull/49101
5114 [49109]: https://github.com/rust-lang/rust/pull/49109
5115 [49162]: https://github.com/rust-lang/rust/pull/49162
5116 [49255]: https://github.com/rust-lang/rust/pull/49255
5117 [49299]: https://github.com/rust-lang/rust/pull/49299
5118 [49305]: https://github.com/rust-lang/rust/pull/49305
5119 [49394]: https://github.com/rust-lang/rust/pull/49394
5120 [49458]: https://github.com/rust-lang/rust/pull/49458
5121 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5122 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5123 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5124 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5125 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5126 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5127 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5128 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5129 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5130 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5131 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5132 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5133 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5134 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5135 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5136 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5137 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5138 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5139 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5140 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5141 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5142 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5143 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5144 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5145 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5146 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5147 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5148 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5149 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5150 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5151 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5152 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5153 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5154 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5155 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5156 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5157 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5158 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5159 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5160 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5161 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5162 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5165 Version 1.25.0 (2018-03-29)
5166 ==========================
5170 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5171 - [You can now use nested groups of imports.][47948]
5172 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5173 - [You can now have `|` at the start of a match arm.][47947] e.g.
5175 enum Foo { A, B, C }
5181 | Foo::B => println!("AB"),
5182 | Foo::C => println!("C"),
5189 - [Upgraded to LLVM 6.][47828]
5190 - [Added `-C lto=val` option.][47521]
5191 - [Added `i586-unknown-linux-musl` target][47282]
5195 - [Impl Send for `process::Command` on Unix.][47760]
5196 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5197 - [`UnsafeCell::into_inner` is now safe.][47204]
5198 - [Implement libstd for CloudABI.][47268]
5199 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5200 - [Implement `AsRef<Path>` for Component][46985]
5201 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5202 - [Moved `Duration` to libcore.][46666]
5206 - [`Location::column`]
5209 The following functions can now be used in a constant expression.
5210 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5211 - [`Duration::new`][47300]
5212 - [`Duration::from_secs`][47300]
5213 - [`Duration::from_millis`][47300]
5217 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5218 - [`cargo new` now defaults to creating a binary crate, instead of a
5219 library crate.][cargo/5029]
5223 - [Rust by example is now shipped with new releases][46196]
5227 - [Deprecated `net::lookup_host`.][47510]
5228 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5229 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5230 around indexing operations (see [#47349][47349]). This has been fixed (which also
5231 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5232 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5234 [33903]: https://github.com/rust-lang/rust/pull/33903
5235 [47947]: https://github.com/rust-lang/rust/pull/47947
5236 [47948]: https://github.com/rust-lang/rust/pull/47948
5237 [47760]: https://github.com/rust-lang/rust/pull/47760
5238 [47790]: https://github.com/rust-lang/rust/pull/47790
5239 [47828]: https://github.com/rust-lang/rust/pull/47828
5240 [47398]: https://github.com/rust-lang/rust/pull/47398
5241 [47510]: https://github.com/rust-lang/rust/pull/47510
5242 [47521]: https://github.com/rust-lang/rust/pull/47521
5243 [47204]: https://github.com/rust-lang/rust/pull/47204
5244 [47251]: https://github.com/rust-lang/rust/pull/47251
5245 [47268]: https://github.com/rust-lang/rust/pull/47268
5246 [47282]: https://github.com/rust-lang/rust/pull/47282
5247 [47300]: https://github.com/rust-lang/rust/pull/47300
5248 [47349]: https://github.com/rust-lang/rust/pull/47349
5249 [46931]: https://github.com/rust-lang/rust/pull/46931
5250 [46985]: https://github.com/rust-lang/rust/pull/46985
5251 [47006]: https://github.com/rust-lang/rust/pull/47006
5252 [46830]: https://github.com/rust-lang/rust/pull/46830
5253 [46095]: https://github.com/rust-lang/rust/pull/46095
5254 [46666]: https://github.com/rust-lang/rust/pull/46666
5255 [46196]: https://github.com/rust-lang/rust/pull/46196
5256 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5257 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5258 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5259 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5260 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5263 Version 1.24.1 (2018-03-01)
5264 ==========================
5266 - [Do not abort when unwinding through FFI][48251]
5267 - [Emit UTF-16 files for linker arguments on Windows][48318]
5268 - [Make the error index generator work again][48308]
5269 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5271 [48251]: https://github.com/rust-lang/rust/issues/48251
5272 [48308]: https://github.com/rust-lang/rust/issues/48308
5273 [48318]: https://github.com/rust-lang/rust/issues/48318
5274 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5277 Version 1.24.0 (2018-02-15)
5278 ==========================
5282 - [External `sysv64` ffi is now available.][46528]
5283 eg. `extern "sysv64" fn foo () {}`
5287 - [rustc now uses 16 codegen units by default for release builds.][46910]
5288 For the fastest builds, utilize `codegen-units=1`.
5289 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5290 - [Add `aarch64-unknown-openbsd` support][46760]
5294 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5295 improvement in performance in the majority of cases.
5296 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5297 with Windows.][46798]
5298 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5299 - [impl `From<bool>` for `AtomicBool`][46293]
5300 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5301 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5302 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5303 - [float::from_bits now just uses transmute.][46012] This provides
5304 some optimisations from LLVM.
5305 - [Copied `AsciiExt` methods onto `char`][46077]
5306 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5307 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5308 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5309 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5313 - [`RefCell::replace`]
5315 - [`atomic::spin_loop_hint`]
5317 The following functions can now be used in a constant expression.
5318 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5320 - [`AtomicBool::new`][46287]
5321 - [`AtomicUsize::new`][46287]
5322 - [`AtomicIsize::new`][46287]
5323 - [`AtomicPtr::new`][46287]
5324 - [`Cell::new`][46287]
5325 - [`{integer}::min_value`][46287]
5326 - [`{integer}::max_value`][46287]
5327 - [`mem::size_of`][46287]
5328 - [`mem::align_of`][46287]
5329 - [`ptr::null`][46287]
5330 - [`ptr::null_mut`][46287]
5331 - [`RefCell::new`][46287]
5332 - [`UnsafeCell::new`][46287]
5336 - [Added a `workspace.default-members` config that
5337 overrides implied `--all` in virtual workspaces.][cargo/4743]
5338 - [Enable incremental by default on development builds.][cargo/4817] Also added
5339 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5340 per-project or global basis respectively.
5347 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5348 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5349 in accordance with IETF RFC 4291 §2.2.
5350 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5351 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5352 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5353 - [Leading zeros in tuple struct members is now an error][47084]
5354 - [`column!()` macro is one-based instead of zero-based][46977]
5355 - [`fmt::Arguments` can no longer be shared across threads][45198]
5356 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5357 - [Cargo sets a different working directory for the compiler][cargo/4788]
5359 [44884]: https://github.com/rust-lang/rust/pull/44884
5360 [45198]: https://github.com/rust-lang/rust/pull/45198
5361 [45506]: https://github.com/rust-lang/rust/pull/45506
5362 [45990]: https://github.com/rust-lang/rust/pull/45990
5363 [46012]: https://github.com/rust-lang/rust/pull/46012
5364 [46077]: https://github.com/rust-lang/rust/pull/46077
5365 [46094]: https://github.com/rust-lang/rust/pull/46094
5366 [46284]: https://github.com/rust-lang/rust/pull/46284
5367 [46287]: https://github.com/rust-lang/rust/pull/46287
5368 [46293]: https://github.com/rust-lang/rust/pull/46293
5369 [46528]: https://github.com/rust-lang/rust/pull/46528
5370 [46671]: https://github.com/rust-lang/rust/pull/46671
5371 [46713]: https://github.com/rust-lang/rust/pull/46713
5372 [46735]: https://github.com/rust-lang/rust/pull/46735
5373 [46760]: https://github.com/rust-lang/rust/pull/46760
5374 [46798]: https://github.com/rust-lang/rust/pull/46798
5375 [46828]: https://github.com/rust-lang/rust/pull/46828
5376 [46831]: https://github.com/rust-lang/rust/pull/46831
5377 [46833]: https://github.com/rust-lang/rust/pull/46833
5378 [46910]: https://github.com/rust-lang/rust/pull/46910
5379 [46977]: https://github.com/rust-lang/rust/pull/46977
5380 [47018]: https://github.com/rust-lang/rust/pull/47018
5381 [47080]: https://github.com/rust-lang/rust/pull/47080
5382 [47084]: https://github.com/rust-lang/rust/pull/47084
5383 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5384 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5385 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5386 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5387 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5388 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5391 Version 1.23.0 (2018-01-04)
5392 ==========================
5396 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5397 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5398 Which should fix some confusing errors in some operations.
5402 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5403 undefined behavior.][45920]
5404 - [rustc now suggests renaming import if names clash.][45660]
5405 - [Display errors/warnings correctly when there are zero-width or
5406 wide characters.][45711]
5407 - [rustc now avoids unnecessary copies of arguments that are
5408 simple bindings][45380] This should improve memory usage on average by 5-10%.
5409 - [Updated musl used to build musl rustc to 1.1.17][45393]
5413 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5414 - [Implement Hash for raw pointers to unsized types][45483]
5415 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5416 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5417 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5418 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5419 and `<*mut T>::as_mut`][44932]
5420 - [Optimized `Thread::{park, unpark}` implementation][45524]
5421 - [Improved `SliceExt::binary_search` performance.][45333]
5422 - [impl `FromIterator<()>` for `()`][45379]
5423 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5431 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5432 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5433 - [Added unit test checking to `cargo check`][cargo/4592]
5434 - [Cargo now lets you install a specific version
5435 using `cargo install --version`][cargo/4637]
5439 - [Releases now ship with the Cargo book documentation.][45692]
5440 - [rustdoc now prints rendering warnings on every run.][45324]
5444 - [Changes have been made to type equality to make it more correct,
5445 in rare cases this could break some code.][45853] [Tracking issue for
5446 further information][45852]
5447 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5448 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5449 Android 9, the minimum supported version is Android 14.
5450 - [Bumped the minimum LLVM to 3.9][45326]
5452 [44042]: https://github.com/rust-lang/rust/pull/44042
5453 [44932]: https://github.com/rust-lang/rust/pull/44932
5454 [45267]: https://github.com/rust-lang/rust/pull/45267
5455 [45324]: https://github.com/rust-lang/rust/pull/45324
5456 [45326]: https://github.com/rust-lang/rust/pull/45326
5457 [45333]: https://github.com/rust-lang/rust/pull/45333
5458 [45379]: https://github.com/rust-lang/rust/pull/45379
5459 [45380]: https://github.com/rust-lang/rust/pull/45380
5460 [45393]: https://github.com/rust-lang/rust/pull/45393
5461 [45435]: https://github.com/rust-lang/rust/pull/45435
5462 [45483]: https://github.com/rust-lang/rust/pull/45483
5463 [45524]: https://github.com/rust-lang/rust/pull/45524
5464 [45571]: https://github.com/rust-lang/rust/pull/45571
5465 [45580]: https://github.com/rust-lang/rust/pull/45580
5466 [45610]: https://github.com/rust-lang/rust/pull/45610
5467 [45660]: https://github.com/rust-lang/rust/pull/45660
5468 [45692]: https://github.com/rust-lang/rust/pull/45692
5469 [45711]: https://github.com/rust-lang/rust/pull/45711
5470 [45772]: https://github.com/rust-lang/rust/pull/45772
5471 [45852]: https://github.com/rust-lang/rust/issues/45852
5472 [45853]: https://github.com/rust-lang/rust/pull/45853
5473 [45887]: https://github.com/rust-lang/rust/pull/45887
5474 [45920]: https://github.com/rust-lang/rust/pull/45920
5475 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5476 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5477 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5480 Version 1.22.1 (2017-11-22)
5481 ==========================
5483 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5485 [46183]: https://github.com/rust-lang/rust/pull/46183
5487 Version 1.22.0 (2017-11-22)
5488 ==========================
5492 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5493 - [Now accepts underscores in unicode escapes][43716]
5494 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5495 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5499 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5500 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5501 This should decrease compile times for debug builds.
5502 - [strict memory alignment now enabled on ARMv6][45094]
5503 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5507 - [Allow atomic operations up to 32 bits
5508 on `armv5te_unknown_linux_gnueabi`][44978]
5509 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5510 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5511 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5512 - [Properly detect overflow in `Instant += Duration`.][44220]
5513 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5514 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5515 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5522 - [Cargo will now build multi file examples in subdirectories of the `examples`
5523 folder that have a `main.rs` file.][cargo/4496]
5524 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5525 the old format will continue to work and can be updated with `cargo update`.
5526 - [Now supports vendoring git repositories][cargo/3992]
5530 - [`libbacktrace` is now available on Apple platforms.][44251]
5531 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5532 This now lets you specify that a given code example will fail to compile.
5536 - [The minimum Android version that rustc can build for has been bumped
5537 to `4.0` from `2.3`][45656]
5538 - [Allowing `T op= &T` for numeric types has broken some type
5539 inference cases][45480]
5542 [42526]: https://github.com/rust-lang/rust/pull/42526
5543 [43716]: https://github.com/rust-lang/rust/pull/43716
5544 [43949]: https://github.com/rust-lang/rust/pull/43949
5545 [44015]: https://github.com/rust-lang/rust/pull/44015
5546 [44220]: https://github.com/rust-lang/rust/pull/44220
5547 [44251]: https://github.com/rust-lang/rust/pull/44251
5548 [44287]: https://github.com/rust-lang/rust/pull/44287
5549 [44303]: https://github.com/rust-lang/rust/pull/44303
5550 [44456]: https://github.com/rust-lang/rust/pull/44456
5551 [44466]: https://github.com/rust-lang/rust/pull/44466
5552 [44895]: https://github.com/rust-lang/rust/pull/44895
5553 [44966]: https://github.com/rust-lang/rust/pull/44966
5554 [44978]: https://github.com/rust-lang/rust/pull/44978
5555 [45041]: https://github.com/rust-lang/rust/pull/45041
5556 [45064]: https://github.com/rust-lang/rust/pull/45064
5557 [45075]: https://github.com/rust-lang/rust/pull/45075
5558 [45094]: https://github.com/rust-lang/rust/pull/45094
5559 [45095]: https://github.com/rust-lang/rust/pull/45095
5560 [45480]: https://github.com/rust-lang/rust/issues/45480
5561 [45656]: https://github.com/rust-lang/rust/pull/45656
5562 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5563 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5564 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5571 Version 1.21.0 (2017-10-12)
5572 ==========================
5576 - [You can now use static references for literals.][43838]
5580 let x: &'static u32 = &0;
5583 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5586 my_macro!(Vec<i32>::new); // Always worked
5587 my_macro!(Vec::<i32>::new); // Now works
5592 - [Upgraded jemalloc to 4.5.0][43911]
5593 - [Enabled unwinding panics on Redox][43917]
5594 - [Now runs LLVM in parallel during translation phase.][43506]
5595 This should reduce peak memory usage.
5599 - [Generate builtin impls for `Clone` for all arrays and tuples that
5600 are `T: Clone`][43690]
5601 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5602 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5603 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5608 [`std::mem::discriminant`]
5612 - [You can now call `cargo install` with multiple package names][cargo/4216]
5613 - [Cargo commands inside a virtual workspace will now implicitly
5614 pass `--all`][cargo/4335]
5615 - [Added a `[patch]` section to `Cargo.toml` to handle
5616 prepublication dependencies][cargo/4123] [RFC 1969]
5617 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5618 like patterns][cargo/4270]
5619 - [Added the `--all-targets` option][cargo/4400]
5620 - [Using required dependencies as a feature is now deprecated and emits
5621 a warning][cargo/4364]
5626 - [Cargo docs are moving][43916]
5627 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5628 - [The rustdoc book is now available][43863]
5629 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5630 - [Added a preview of RLS has been made available through rustup][44204]
5631 Install with `rustup component add rls-preview`
5632 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5633 Previously only showed `std::os::unix`.
5637 - [Changes in method matching against higher-ranked types][43880] This may cause
5638 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5639 - [rustc's JSON error output's byte position start at top of file.][42973]
5640 Was previously relative to the rustc's internal `CodeMap` struct which
5641 required the unstable library `libsyntax` to correctly use.
5642 - [`unused_results` lint no longer ignores booleans][43728]
5644 [42565]: https://github.com/rust-lang/rust/pull/42565
5645 [42973]: https://github.com/rust-lang/rust/pull/42973
5646 [43348]: https://github.com/rust-lang/rust/pull/43348
5647 [43459]: https://github.com/rust-lang/rust/pull/43459
5648 [43506]: https://github.com/rust-lang/rust/pull/43506
5649 [43540]: https://github.com/rust-lang/rust/pull/43540
5650 [43690]: https://github.com/rust-lang/rust/pull/43690
5651 [43728]: https://github.com/rust-lang/rust/pull/43728
5652 [43838]: https://github.com/rust-lang/rust/pull/43838
5653 [43863]: https://github.com/rust-lang/rust/pull/43863
5654 [43880]: https://github.com/rust-lang/rust/pull/43880
5655 [43911]: https://github.com/rust-lang/rust/pull/43911
5656 [43916]: https://github.com/rust-lang/rust/pull/43916
5657 [43917]: https://github.com/rust-lang/rust/pull/43917
5658 [44204]: https://github.com/rust-lang/rust/pull/44204
5659 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5660 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5661 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5662 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5663 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5664 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5665 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5666 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5667 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5669 Version 1.20.0 (2017-08-31)
5670 ===========================
5674 - [Associated constants are now stabilised.][42809]
5675 - [A lot of macro bugs are now fixed.][42913]
5680 - [Struct fields are now properly coerced to the expected field type.][42807]
5681 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5682 `wasm32-experimental-emscripten` target.
5683 - [Changed some of the error messages to be more helpful.][42033]
5684 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5686 - [rustc now reports the total number of errors on compilation failure][43015]
5687 previously this was only the number of errors in the pass that failed.
5688 - [Expansion in rustc has been sped up 29x.][42533]
5689 - [added `msp430-none-elf` target.][43099]
5690 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5692 - [Fixes backtraces on Redox][43228]
5693 - [rustc now identifies different versions of same crate when absolute paths of
5694 different types match in an error message.][42826]
5700 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5701 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5703 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5704 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5705 - [Impl `Clone` for `DefaultHasher`.][42799]
5706 - [Impl `Sync` for `SyncSender`.][42397]
5707 - [Impl `FromStr` for `char`][42271]
5708 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5710 - [allow messages in the `unimplemented!()` macro.][42155]
5711 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5712 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5713 - [Upgrade to Unicode 10.0.0][42999]
5714 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5715 - [Skip the main thread's manual stack guard on Linux][43072]
5716 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5717 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5719 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5724 - [`CStr::into_c_string`]
5725 - [`CString::as_c_str`]
5726 - [`CString::into_boxed_c_str`]
5727 - [`Chain::get_mut`]
5728 - [`Chain::get_ref`]
5729 - [`Chain::into_inner`]
5730 - [`Option::get_or_insert_with`]
5731 - [`Option::get_or_insert`]
5732 - [`OsStr::into_os_string`]
5733 - [`OsString::into_boxed_os_str`]
5736 - [`Utf8Error::error_len`]
5737 - [`char::EscapeDebug`]
5738 - [`char::escape_debug`]
5739 - [`compile_error!`]
5740 - [`f32::from_bits`]
5742 - [`f64::from_bits`]
5744 - [`mem::ManuallyDrop`]
5745 - [`slice::sort_unstable_by_key`]
5746 - [`slice::sort_unstable_by`]
5747 - [`slice::sort_unstable`]
5748 - [`str::from_boxed_utf8_unchecked`]
5749 - [`str::as_bytes_mut`]
5750 - [`str::as_bytes_mut`]
5751 - [`str::from_utf8_mut`]
5752 - [`str::from_utf8_unchecked_mut`]
5754 - [`str::get_unchecked_mut`]
5755 - [`str::get_unchecked`]
5757 - [`str::into_boxed_bytes`]
5762 - [Cargo API token location moved from `~/.cargo/config` to
5763 `~/.cargo/credentials`.][cargo/3978]
5764 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5765 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5766 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5767 - [You can now specify version of a binary when installed through
5768 `cargo install` using `--vers`.][cargo/4229]
5769 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5770 failure.][cargo/4248]
5771 - [Changed the convention around which file is the crate root.][cargo/4259]
5776 - [Functions with `'static` in their return types will now not be as usable as
5777 if they were using lifetime parameters instead.][42417]
5778 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5779 takes the sign of NaN into account where previously didn't.][42430]
5781 [42033]: https://github.com/rust-lang/rust/pull/42033
5782 [42155]: https://github.com/rust-lang/rust/pull/42155
5783 [42271]: https://github.com/rust-lang/rust/pull/42271
5784 [42397]: https://github.com/rust-lang/rust/pull/42397
5785 [42417]: https://github.com/rust-lang/rust/pull/42417
5786 [42430]: https://github.com/rust-lang/rust/pull/42430
5787 [42431]: https://github.com/rust-lang/rust/pull/42431
5788 [42533]: https://github.com/rust-lang/rust/pull/42533
5789 [42571]: https://github.com/rust-lang/rust/pull/42571
5790 [42613]: https://github.com/rust-lang/rust/pull/42613
5791 [42799]: https://github.com/rust-lang/rust/pull/42799
5792 [42807]: https://github.com/rust-lang/rust/pull/42807
5793 [42809]: https://github.com/rust-lang/rust/pull/42809
5794 [42822]: https://github.com/rust-lang/rust/pull/42822
5795 [42826]: https://github.com/rust-lang/rust/pull/42826
5796 [42854]: https://github.com/rust-lang/rust/pull/42854
5797 [42913]: https://github.com/rust-lang/rust/pull/42913
5798 [42999]: https://github.com/rust-lang/rust/pull/42999
5799 [43011]: https://github.com/rust-lang/rust/pull/43011
5800 [43015]: https://github.com/rust-lang/rust/pull/43015
5801 [43072]: https://github.com/rust-lang/rust/pull/43072
5802 [43077]: https://github.com/rust-lang/rust/pull/43077
5803 [43097]: https://github.com/rust-lang/rust/pull/43097
5804 [43099]: https://github.com/rust-lang/rust/pull/43099
5805 [43170]: https://github.com/rust-lang/rust/pull/43170
5806 [43178]: https://github.com/rust-lang/rust/pull/43178
5807 [43185]: https://github.com/rust-lang/rust/pull/43185
5808 [43228]: https://github.com/rust-lang/rust/pull/43228
5809 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5810 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5811 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5812 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5813 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5814 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5815 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5816 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5817 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5818 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5819 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5820 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5821 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5822 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5823 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5824 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5825 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5826 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5827 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5828 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5829 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5830 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5831 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5832 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5833 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5834 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5835 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5836 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5837 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5838 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5839 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5840 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5841 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5842 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5843 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5844 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5845 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5846 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5849 Version 1.19.0 (2017-07-20)
5850 ===========================
5855 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5856 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5857 - [Macro recursion limit increased to 1024 from 64.][41676]
5858 - [Added lint for detecting unused macros.][41907]
5859 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5860 For example: `let x = loop { break 7; };`
5861 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5862 contain `Copy` types and cannot have a `Drop` implementation.
5863 Example: `union Foo { bar: u8, baz: usize }`
5864 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5865 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5870 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5871 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5872 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5873 you should use `--target armv7-linux-androideabi`.
5874 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5875 - [Minor optimisation of string operations.][42037]
5876 - [Compiler error message is now `aborting due to previous error(s)` instead of
5877 `aborting due to N previous errors`][42150] This was previously inaccurate and
5878 would only count certain kinds of errors.
5879 - [The compiler now supports Visual Studio 2017][42225]
5880 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5881 - [Added a lot][42264] of [new error codes][42302]
5882 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5883 libraries with C Run-time Libraries(CRT) to be statically linked.
5884 - [Fixed various ARM codegen bugs][42740]
5889 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5890 `Extend<Cow<'a, str>>`][41449]
5891 - [`Vec` now implements `From<&mut [T]>`][41530]
5892 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5893 - [`SplitWhitespace` now implements `Clone`][41659]
5894 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5896 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5897 macros, but for printing to stderr.
5902 - [`OsString::shrink_to_fit`]
5905 - [`thread::ThreadId`]
5910 - [Build scripts can now add environment variables to the environment
5911 the crate is being compiled in.
5912 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5913 - [Subcommands now replace the current process rather than spawning a new
5914 child process][cargo/3970]
5915 - [Workspace members can now accept glob file patterns][cargo/3979]
5916 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5917 the members in a given workspace.][cargo/3988]
5918 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5919 - [Target directory path is now in the cargo metadata][cargo/4022]
5920 - [Cargo no longer checks out a local working directory for the
5921 crates.io index][cargo/4026] This should provide smaller file size for the
5922 registry, and improve cloning times, especially on Windows machines.
5923 - [Added an `--exclude` option for excluding certain packages when using the
5924 `--all` option][cargo/4031]
5925 - [Cargo will now automatically retry when receiving a 5xx error
5926 from crates.io][cargo/4032]
5927 - [The `--features` option now accepts multiple comma or space
5928 delimited values.][cargo/4084]
5929 - [Added support for custom target specific runners][cargo/3954]
5934 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5936 - [Rust will now release XZ compressed packages][rust-installer/57]
5937 - [rustup will now prefer to download rust packages with
5938 XZ compression][rustup/1100] over GZip packages.
5939 - [Added the ability to escape `#` in rust documentation][41785] By adding
5940 additional `#`'s ie. `##` is now `#`
5945 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5946 - [`-Z` flags are now no longer allowed to be used on the stable
5947 compiler.][41751] This has been a warning for a year previous to this.
5948 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5949 longer works][42844]. Users should migrate to the built-in `check`
5950 command, which has been available since 1.16.
5951 - [Ending a float literal with `._` is now a hard error.
5952 Example: `42._` .][41946]
5953 - [Any use of a private `extern crate` outside of its module is now a
5954 hard error.][36886] This was previously a warning.
5955 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5956 relative while the `::` prefix makes a path absolute, but was ignored and the
5957 path was relative regardless.
5958 - [Floating point constants in match patterns is now a hard error][36890]
5959 This was previously a warning.
5960 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5961 match patterns is now a hard error][36891] This was previously a warning.
5962 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5964 - [From the pound escape, lines consisting of multiple `#`s are
5966 - [It is an error to re-export private enum variants][42460]. This is
5967 known to break a number of crates that depend on an older version of
5969 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5970 to use it to find the linker, and the build will fail where it did
5971 not previously][42607]
5973 [36886]: https://github.com/rust-lang/rust/issues/36886
5974 [36888]: https://github.com/rust-lang/rust/issues/36888
5975 [36890]: https://github.com/rust-lang/rust/issues/36890
5976 [36891]: https://github.com/rust-lang/rust/issues/36891
5977 [36892]: https://github.com/rust-lang/rust/issues/36892
5978 [37406]: https://github.com/rust-lang/rust/issues/37406
5979 [39983]: https://github.com/rust-lang/rust/pull/39983
5980 [41145]: https://github.com/rust-lang/rust/pull/41145
5981 [41192]: https://github.com/rust-lang/rust/pull/41192
5982 [41258]: https://github.com/rust-lang/rust/pull/41258
5983 [41370]: https://github.com/rust-lang/rust/pull/41370
5984 [41449]: https://github.com/rust-lang/rust/pull/41449
5985 [41530]: https://github.com/rust-lang/rust/pull/41530
5986 [41624]: https://github.com/rust-lang/rust/pull/41624
5987 [41656]: https://github.com/rust-lang/rust/pull/41656
5988 [41659]: https://github.com/rust-lang/rust/pull/41659
5989 [41676]: https://github.com/rust-lang/rust/pull/41676
5990 [41751]: https://github.com/rust-lang/rust/pull/41751
5991 [41764]: https://github.com/rust-lang/rust/pull/41764
5992 [41785]: https://github.com/rust-lang/rust/pull/41785
5993 [41873]: https://github.com/rust-lang/rust/pull/41873
5994 [41907]: https://github.com/rust-lang/rust/pull/41907
5995 [41946]: https://github.com/rust-lang/rust/pull/41946
5996 [42016]: https://github.com/rust-lang/rust/pull/42016
5997 [42037]: https://github.com/rust-lang/rust/pull/42037
5998 [42068]: https://github.com/rust-lang/rust/pull/42068
5999 [42150]: https://github.com/rust-lang/rust/pull/42150
6000 [42162]: https://github.com/rust-lang/rust/pull/42162
6001 [42225]: https://github.com/rust-lang/rust/pull/42225
6002 [42264]: https://github.com/rust-lang/rust/pull/42264
6003 [42302]: https://github.com/rust-lang/rust/pull/42302
6004 [42460]: https://github.com/rust-lang/rust/issues/42460
6005 [42607]: https://github.com/rust-lang/rust/issues/42607
6006 [42740]: https://github.com/rust-lang/rust/pull/42740
6007 [42844]: https://github.com/rust-lang/rust/issues/42844
6008 [42948]: https://github.com/rust-lang/rust/pull/42948
6009 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6010 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6011 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6012 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6013 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6014 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6015 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6016 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6017 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6018 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6019 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6020 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6021 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6022 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6023 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6024 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6025 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6026 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6027 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6028 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6029 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6030 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6033 Version 1.18.0 (2017-06-08)
6034 ===========================
6039 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6040 make the item visible to just that module tree. Also accepts the keyword
6041 `crate` to make something public to the whole crate but not users of the
6042 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6043 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6044 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6045 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6046 types like `Write + Send`, trailing `+` are now supported in trait objects,
6047 and better error reporting for trait objects starting with `?Sized`.
6048 - [0e+10 is now a valid floating point literal][40589]
6049 - [Now warns if you bind a lifetime parameter to 'static][40734]
6050 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6051 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6052 representation in some cases.][40377]
6057 - [rustc can now emit mir with `--emit mir`][39891]
6058 - [Improved LLVM IR for trivial functions][40367]
6059 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6060 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6061 opportunities found through profiling
6062 - [Improved backtrace formatting when panicking][38165]
6067 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6068 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6069 iteration or reallocation.
6070 - [Simplified HashMap Bucket interface][40561] provides performance
6071 improvements for iterating and cloning.
6072 - [Specialize Vec::from_elem to use calloc][40409]
6073 - [Fixed Race condition in fs::create_dir_all][39799]
6074 - [No longer caching stdio on Windows][40516]
6075 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6076 2.50%~ faster and in one case now 12.50% faster.
6077 - [Optimized `AtomicBool::fetch_nand`][41143]
6082 - [`Child::try_wait`]
6083 - [`HashMap::retain`]
6084 - [`HashSet::retain`]
6086 - [`TcpStream::peek`]
6087 - [`UdpSocket::peek`]
6088 - [`UdpSocket::peek_from`]
6093 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6094 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6095 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6096 - [Added Android build support][cargo/3885]
6097 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6098 of a certain type, for example `cargo build --bins` will build all
6100 - [Added support for haiku][cargo/3952]
6105 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6106 - [Rust now uses the official cross compiler for NetBSD][40612]
6107 - [rustdoc now accepts `#` at the start of files][40828]
6108 - [Fixed jemalloc support for musl][41168]
6113 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6114 always placed after the sign if it exists and before the digits. With the `#`
6115 flag the zeroes are placed after the prefix and before the digits.
6116 - [Due to the struct field optimisation][40377], using `transmute` on structs
6117 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6118 always been undefined behavior, but is now more likely to break in practice.
6119 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6120 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6121 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6122 - [Overlapping inherent `impl`s are now a hard error][40728]
6123 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6124 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6125 `out.asm` and `out.ll` instead of only one of the filetypes.
6126 - [ calling a function that returns `Self` will no longer work][41805] when
6127 the size of `Self` cannot be statically determined.
6128 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6129 this has caused a few regressions namely:
6131 - Changed the link order of local static/dynamic libraries (respecting the
6132 order on given rather than having the compiler reorder).
6133 - Changed how MinGW is linked, native code linked to dynamic libraries
6134 may require manually linking to the gcc support library (for the native
6137 [38165]: https://github.com/rust-lang/rust/pull/38165
6138 [39799]: https://github.com/rust-lang/rust/pull/39799
6139 [39891]: https://github.com/rust-lang/rust/pull/39891
6140 [40043]: https://github.com/rust-lang/rust/pull/40043
6141 [40241]: https://github.com/rust-lang/rust/pull/40241
6142 [40338]: https://github.com/rust-lang/rust/pull/40338
6143 [40367]: https://github.com/rust-lang/rust/pull/40367
6144 [40377]: https://github.com/rust-lang/rust/pull/40377
6145 [40409]: https://github.com/rust-lang/rust/pull/40409
6146 [40516]: https://github.com/rust-lang/rust/pull/40516
6147 [40556]: https://github.com/rust-lang/rust/pull/40556
6148 [40561]: https://github.com/rust-lang/rust/pull/40561
6149 [40589]: https://github.com/rust-lang/rust/pull/40589
6150 [40612]: https://github.com/rust-lang/rust/pull/40612
6151 [40723]: https://github.com/rust-lang/rust/pull/40723
6152 [40728]: https://github.com/rust-lang/rust/pull/40728
6153 [40731]: https://github.com/rust-lang/rust/pull/40731
6154 [40734]: https://github.com/rust-lang/rust/pull/40734
6155 [40805]: https://github.com/rust-lang/rust/pull/40805
6156 [40807]: https://github.com/rust-lang/rust/pull/40807
6157 [40828]: https://github.com/rust-lang/rust/pull/40828
6158 [40870]: https://github.com/rust-lang/rust/pull/40870
6159 [41085]: https://github.com/rust-lang/rust/pull/41085
6160 [41143]: https://github.com/rust-lang/rust/pull/41143
6161 [41168]: https://github.com/rust-lang/rust/pull/41168
6162 [41270]: https://github.com/rust-lang/rust/issues/41270
6163 [41469]: https://github.com/rust-lang/rust/pull/41469
6164 [41805]: https://github.com/rust-lang/rust/issues/41805
6165 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6166 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6167 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6168 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6169 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6170 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6171 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6172 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6173 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6174 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6175 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6176 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6177 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6178 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6181 Version 1.17.0 (2017-04-27)
6182 ===========================
6187 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6188 * [Fields of structs may be initialized without duplicating the field/variable
6189 names][39761]. [RFC 1682]
6190 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6191 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6192 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6193 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6194 `'b`. Soundness fix.
6195 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6196 * [Static variables may contain references to other statics][40027]
6201 * [Exit quickly on only `--emit dep-info`][40336]
6202 * [Make `-C relocation-model` more correctly determine whether the linker
6203 creates a position-independent executable][40245]
6204 * [Add `-C overflow-checks` to directly control whether integer overflow
6206 * [The rustc type checker now checks items on demand instead of in a single
6207 in-order pass][40008]. This is mostly an internal refactoring in support of
6208 future work, including incremental type checking, but also resolves [RFC
6209 1647], allowing `Self` to appear in `impl` `where` clauses.
6210 * [Optimize vtable loads][39995]
6211 * [Turn off vectorization for Emscripten targets][39990]
6212 * [Provide suggestions for unknown macros imported with `use`][39953]
6213 * [Fix ICEs in path resolution][39939]
6214 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6215 * [Add clearer error message using `&str + &str`][39116]
6226 * [`Ordering::then`]
6227 * [`Ordering::then_with`]
6228 * [`BTreeMap::range`]
6229 * [`BTreeMap::range_mut`]
6230 * [`collections::Bound`]
6231 * [`process::abort`]
6232 * [`ptr::read_unaligned`]
6233 * [`ptr::write_unaligned`]
6234 * [`Result::expect_err`]
6237 * [`Cell::into_inner`]
6243 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6244 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6245 * [`String` implements `FromIterator<&char>`][40028]
6246 * `Box` [implements][40009] a number of new conversions:
6247 `From<Box<str>> for String`,
6248 `From<Box<[T]>> for Vec<T>`,
6249 `From<Box<CStr>> for CString`,
6250 `From<Box<OsStr>> for OsString`,
6251 `From<Box<Path>> for PathBuf`,
6252 `Into<Box<str>> for String`,
6253 `Into<Box<[T]>> for Vec<T>`,
6254 `Into<Box<CStr>> for CString`,
6255 `Into<Box<OsStr>> for OsString`,
6256 `Into<Box<Path>> for PathBuf`,
6257 `Default for Box<str>`,
6258 `Default for Box<CStr>`,
6259 `Default for Box<OsStr>`,
6260 `From<&CStr> for Box<CStr>`,
6261 `From<&OsStr> for Box<OsStr>`,
6262 `From<&Path> for Box<Path>`
6263 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6264 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6265 * [Slightly optimize `slice::sort`][39538]
6266 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6267 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6268 `Box<str>` implements `From<&str>`][39438]
6269 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6270 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6271 * [`format!` estimates the needed capacity before writing a string][39356]
6272 * [Support unprivileged symlink creation in Windows][38921]
6273 * [`PathBuf` implements `Default`][38764]
6274 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6275 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6276 and poor hash functions.
6281 * [Add `cargo check --all`][cargo/3731]
6282 * [Add an option to ignore SSL revocation checking][cargo/3699]
6283 * [Add `cargo run --package`][cargo/3691]
6284 * [Add `required_features`][cargo/3667]
6285 * [Assume `build.rs` is a build script][cargo/3664]
6286 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6291 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6293 * [The "Unstable Book" documents nightly-only features][ubook]
6294 * [Improve the style of the sidebar in rustdoc output][40265]
6295 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6296 * [Fix MSP430 breakage due to `i128`][40257]
6297 * [Preliminary Solaris/SPARCv9 support][39903]
6298 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6299 run without installing the MSVC runtime.
6300 * [`rustdoc --test` includes file names in test names][39788]
6301 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6302 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6303 * [Initial support for `aarch64-unknown-freebsd`][39491]
6304 * [Initial support for `i686-unknown-netbsd`][39426]
6305 * [This release no longer includes the old makefile build system][39431]. Rust
6306 is built with a custom build system, written in Rust, and with Cargo.
6307 * [Add Debug implementations for libcollection structs][39002]
6308 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6309 * [`--test-threads=0` produces an error][38945]
6310 * [`rustup` installs documentation by default][40526]
6311 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6312 WinDbg and Visual Studio to improve the debugging experience.
6317 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6318 workaround, either use MSVC 2015 or run vcvars.bat.
6319 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6320 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6321 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6323 * [`format!` and `Display::to_string` panic if an underlying formatting
6324 implementation returns an error][40117]. Previously the error was silently
6325 ignored. It is incorrect for `write_fmt` to return an error when writing
6327 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6328 crates were marked stable and could be accessed from the stable toolchain.
6329 * [Rust git source no longer includes vendored crates][39728]. Those that need
6330 to build with vendored crates should build from release tarballs.
6331 * [Fix inert attributes from `proc_macro_derives`][39572]
6332 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6333 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6335 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6336 existing code generally ignores the type of dead-code unless a type-hint is
6337 provided; this can cause surprising inference interactions particularly around
6338 defaulting. The new code uniformly ignores the result type of dead-code.
6339 * [Tuple-struct constructors with private fields are no longer visible][38932]
6340 * [Lifetime parameters that do not appear in the arguments are now considered
6341 early-bound][38897], resolving a soundness bug (#[32330]). The
6342 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6344 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6345 * [Make transmuting from fn item types to pointer-sized types a hard
6348 [27787]: https://github.com/rust-lang/rust/issues/27787
6349 [32330]: https://github.com/rust-lang/rust/issues/32330
6350 [34198]: https://github.com/rust-lang/rust/pull/34198
6351 [38161]: https://github.com/rust-lang/rust/pull/38161
6352 [38368]: https://github.com/rust-lang/rust/pull/38368
6353 [38584]: https://github.com/rust-lang/rust/issues/38584
6354 [38661]: https://github.com/rust-lang/rust/pull/38661
6355 [38764]: https://github.com/rust-lang/rust/pull/38764
6356 [38864]: https://github.com/rust-lang/rust/issues/38864
6357 [38897]: https://github.com/rust-lang/rust/pull/38897
6358 [38921]: https://github.com/rust-lang/rust/pull/38921
6359 [38932]: https://github.com/rust-lang/rust/pull/38932
6360 [38945]: https://github.com/rust-lang/rust/pull/38945
6361 [38981]: https://github.com/rust-lang/rust/pull/38981
6362 [39002]: https://github.com/rust-lang/rust/pull/39002
6363 [39116]: https://github.com/rust-lang/rust/pull/39116
6364 [39193]: https://github.com/rust-lang/rust/pull/39193
6365 [39265]: https://github.com/rust-lang/rust/pull/39265
6366 [39356]: https://github.com/rust-lang/rust/pull/39356
6367 [39372]: https://github.com/rust-lang/rust/pull/39372
6368 [39426]: https://github.com/rust-lang/rust/pull/39426
6369 [39431]: https://github.com/rust-lang/rust/pull/39431
6370 [39438]: https://github.com/rust-lang/rust/pull/39438
6371 [39440]: https://github.com/rust-lang/rust/pull/39440
6372 [39485]: https://github.com/rust-lang/rust/pull/39485
6373 [39491]: https://github.com/rust-lang/rust/pull/39491
6374 [39518]: https://github.com/rust-lang/rust/pull/39518
6375 [39538]: https://github.com/rust-lang/rust/pull/39538
6376 [39572]: https://github.com/rust-lang/rust/pull/39572
6377 [39633]: https://github.com/rust-lang/rust/pull/39633
6378 [39642]: https://github.com/rust-lang/rust/pull/39642
6379 [39728]: https://github.com/rust-lang/rust/pull/39728
6380 [39761]: https://github.com/rust-lang/rust/pull/39761
6381 [39788]: https://github.com/rust-lang/rust/pull/39788
6382 [39793]: https://github.com/rust-lang/rust/pull/39793
6383 [39837]: https://github.com/rust-lang/rust/pull/39837
6384 [39843]: https://github.com/rust-lang/rust/pull/39843
6385 [39851]: https://github.com/rust-lang/rust/pull/39851
6386 [39903]: https://github.com/rust-lang/rust/pull/39903
6387 [39939]: https://github.com/rust-lang/rust/pull/39939
6388 [39953]: https://github.com/rust-lang/rust/pull/39953
6389 [39960]: https://github.com/rust-lang/rust/pull/39960
6390 [39990]: https://github.com/rust-lang/rust/pull/39990
6391 [39995]: https://github.com/rust-lang/rust/pull/39995
6392 [40008]: https://github.com/rust-lang/rust/pull/40008
6393 [40009]: https://github.com/rust-lang/rust/pull/40009
6394 [40027]: https://github.com/rust-lang/rust/pull/40027
6395 [40028]: https://github.com/rust-lang/rust/pull/40028
6396 [40037]: https://github.com/rust-lang/rust/pull/40037
6397 [40117]: https://github.com/rust-lang/rust/pull/40117
6398 [40166]: https://github.com/rust-lang/rust/pull/40166
6399 [40245]: https://github.com/rust-lang/rust/pull/40245
6400 [40257]: https://github.com/rust-lang/rust/pull/40257
6401 [40261]: https://github.com/rust-lang/rust/pull/40261
6402 [40265]: https://github.com/rust-lang/rust/pull/40265
6403 [40319]: https://github.com/rust-lang/rust/pull/40319
6404 [40336]: https://github.com/rust-lang/rust/pull/40336
6405 [40526]: https://github.com/rust-lang/rust/pull/40526
6406 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6407 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6408 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6409 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6410 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6411 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6412 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6413 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6414 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6415 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6416 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6417 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6418 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6419 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6420 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6421 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6422 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6423 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6424 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6425 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6426 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6427 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6428 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6429 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6430 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6431 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6432 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6433 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6434 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6435 [ubook]: https://doc.rust-lang.org/unstable-book/
6438 Version 1.16.0 (2017-03-16)
6439 ===========================
6444 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6445 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6446 match patterns][38069]
6447 * [Clean up semantics of `self` in an import list][38313]
6448 * [`Self` may appear in `impl` headers][38920]
6449 * [`Self` may appear in struct expressions][39282]
6454 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6455 a `.rmeta` file containing only crate metadata][38571]. This can be
6456 used by tools like the Rust Language Service to perform
6457 metadata-only builds.
6458 * [Levenshtein based typo suggestions now work in most places, while
6459 previously they worked only for fields and sometimes for local
6460 variables][38927]. Together with the overhaul of "no
6461 resolution"/"unexpected resolution" errors (#[38154]) they result in
6462 large and systematic improvement in resolution diagnostics.
6463 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6465 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6466 * [`rustc` no longer attempts to provide "consider using an explicit
6467 lifetime" suggestions][37057]. They were inaccurate.
6472 * [`VecDeque::truncate`]
6473 * [`VecDeque::resize`]
6474 * [`String::insert_str`]
6475 * [`Duration::checked_add`]
6476 * [`Duration::checked_sub`]
6477 * [`Duration::checked_div`]
6478 * [`Duration::checked_mul`]
6481 * [`SocketAddr::is_ipv4`]
6482 * [`SocketAddr::is_ipv6`]
6483 * [`IpAddr::is_ipv4`]
6484 * [`IpAddr::is_ipv6`]
6486 * [`Vec::dedup_by_key`]
6487 * [`Result::unwrap_or_default`]
6488 * [`<*const T>::wrapping_offset`]
6489 * [`<*mut T>::wrapping_offset`]
6490 * `CommandExt::creation_flags`
6491 * [`File::set_permissions`]
6492 * [`String::split_off`]
6497 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6498 their argument by `Borrow` parameter][37761]
6499 * [All public types in std implement `Debug`][38006]
6500 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6501 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6502 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6504 * [std: Fix partial writes in `LineWriter`][38062]
6505 * [std: Clamp max read/write sizes on Unix][38622]
6506 * [Use more specific panic message for `&str` slicing errors][38066]
6507 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6508 functionality cannot be achieved in std currently.
6509 * [`writeln!`, like `println!`, now accepts a form with no string
6510 or formatting arguments, to just print a newline][38469]
6511 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6512 * [Reduce the size of static data in `std_unicode::tables`][38781]
6513 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6514 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6516 * [`Duration` implements `Sum`][38712]
6517 * [`String` implements `ToSocketAddrs`][39048]
6522 * [The `cargo check` command does a type check of a project without
6523 building it][cargo/3296]
6524 * [crates.io will display CI badges from Travis and AppVeyor, if
6525 specified in Cargo.toml][cargo/3546]
6526 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6527 * [Compilation profiles accept integer values for `debug`, in addition
6528 to `true` and `false`. These are passed to `rustc` as the value to
6529 `-C debuginfo`][cargo/3534]
6530 * [Implement `cargo --version --verbose`][cargo/3604]
6531 * [All builds now output 'dep-info' build dependencies compatible with
6532 make and ninja][cargo/3557]
6533 * [Build all workspace members with `build --all`][cargo/3511]
6534 * [Document all workspace members with `doc --all`][cargo/3515]
6535 * [Path deps outside workspace are not members][cargo/3443]
6540 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6541 the path to the Rust implementation][38589]
6542 * [The `armv7-linux-androideabi` target no longer enables NEON
6543 extensions, per Google's ABI guide][38413]
6544 * [The stock standard library can be compiled for Redox OS][38401]
6545 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6547 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6549 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6554 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6555 match patterns][38069]
6556 * In this release, references to uninhabited types can not be
6557 pattern-matched. This was accidentally allowed in 1.15.
6558 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6559 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6561 * [Clean up semantics of `self` in an import list][38313]
6562 * Reimplemented lifetime elision. This change was almost entirely compatible
6563 with existing code, but it did close a number of small bugs and loopholes,
6564 as well as being more accepting in some other [cases][41105].
6566 [37057]: https://github.com/rust-lang/rust/pull/37057
6567 [37761]: https://github.com/rust-lang/rust/pull/37761
6568 [38006]: https://github.com/rust-lang/rust/pull/38006
6569 [38051]: https://github.com/rust-lang/rust/pull/38051
6570 [38062]: https://github.com/rust-lang/rust/pull/38062
6571 [38622]: https://github.com/rust-lang/rust/pull/38622
6572 [38066]: https://github.com/rust-lang/rust/pull/38066
6573 [38069]: https://github.com/rust-lang/rust/pull/38069
6574 [38131]: https://github.com/rust-lang/rust/pull/38131
6575 [38154]: https://github.com/rust-lang/rust/pull/38154
6576 [38274]: https://github.com/rust-lang/rust/pull/38274
6577 [38304]: https://github.com/rust-lang/rust/pull/38304
6578 [38313]: https://github.com/rust-lang/rust/pull/38313
6579 [38327]: https://github.com/rust-lang/rust/pull/38327
6580 [38401]: https://github.com/rust-lang/rust/pull/38401
6581 [38413]: https://github.com/rust-lang/rust/pull/38413
6582 [38469]: https://github.com/rust-lang/rust/pull/38469
6583 [38559]: https://github.com/rust-lang/rust/pull/38559
6584 [38571]: https://github.com/rust-lang/rust/pull/38571
6585 [38580]: https://github.com/rust-lang/rust/pull/38580
6586 [38589]: https://github.com/rust-lang/rust/pull/38589
6587 [38670]: https://github.com/rust-lang/rust/pull/38670
6588 [38712]: https://github.com/rust-lang/rust/pull/38712
6589 [38726]: https://github.com/rust-lang/rust/pull/38726
6590 [38781]: https://github.com/rust-lang/rust/pull/38781
6591 [38798]: https://github.com/rust-lang/rust/pull/38798
6592 [38909]: https://github.com/rust-lang/rust/pull/38909
6593 [38920]: https://github.com/rust-lang/rust/pull/38920
6594 [38927]: https://github.com/rust-lang/rust/pull/38927
6595 [39048]: https://github.com/rust-lang/rust/pull/39048
6596 [39282]: https://github.com/rust-lang/rust/pull/39282
6597 [39379]: https://github.com/rust-lang/rust/pull/39379
6598 [41105]: https://github.com/rust-lang/rust/issues/41105
6599 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6600 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6601 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6602 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6603 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6604 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6605 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6606 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6607 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6608 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6609 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6610 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6611 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6612 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6613 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6614 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6615 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6616 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6617 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6618 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6619 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6620 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6621 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6622 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6623 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6624 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6625 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6626 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6627 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6630 Version 1.15.1 (2017-02-09)
6631 ===========================
6633 * [Fix IntoIter::as_mut_slice's signature][39466]
6634 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6636 [39466]: https://github.com/rust-lang/rust/pull/39466
6637 [39523]: https://github.com/rust-lang/rust/pull/39523
6640 Version 1.15.0 (2017-02-02)
6641 ===========================
6646 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6647 stable. This allows popular code-generating crates like Serde and Diesel to
6648 work ergonomically. [RFC 1681].
6649 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6650 with curly braces][36868]. Part of [RFC 1506].
6651 * [A number of minor changes to name resolution have been activated][37127].
6652 They add up to more consistent semantics, allowing for future evolution of
6653 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6654 details of what is different. The breaking changes here have been transitioned
6655 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6656 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6658 * [`?Sized` can be used in `where` clauses][37791]
6659 * [There is now a limit on the size of monomorphized types and it can be
6660 modified with the `#![type_size_limit]` crate attribute, similarly to
6661 the `#![recursion_limit]` attribute][37789]
6666 * [On Windows, the compiler will apply dllimport attributes when linking to
6667 extern functions][37973]. Additional attributes and flags can control which
6668 library kind is linked and its name. [RFC 1717].
6669 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6670 * [The `--test` flag works with procedural macro crates][38107]
6671 * [Fix `extern "aapcs" fn` ABI][37814]
6672 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6673 * [The `format!` expander recognizes incorrect `printf` and shell-style
6674 formatting directives and suggests the correct format][37613].
6675 * [Only report one error for all unused imports in an import list][37456]
6677 Compiler Performance
6678 --------------------
6680 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6681 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6682 * [Don't clone in `UnificationTable::probe`][37848]
6683 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6684 * [Use small vectors in type walker][37760]
6685 * [Macro expansion performance was improved][37701]
6686 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6687 * [Replace FNV with a faster hash function][37229]
6692 * [`std::iter::Iterator::min_by`]
6693 * [`std::iter::Iterator::max_by`]
6694 * [`std::os::*::fs::FileExt`]
6695 * [`std::sync::atomic::Atomic*::get_mut`]
6696 * [`std::sync::atomic::Atomic*::into_inner`]
6697 * [`std::vec::IntoIter::as_slice`]
6698 * [`std::vec::IntoIter::as_mut_slice`]
6699 * [`std::sync::mpsc::Receiver::try_iter`]
6700 * [`std::os::unix::process::CommandExt::before_exec`]
6701 * [`std::rc::Rc::strong_count`]
6702 * [`std::rc::Rc::weak_count`]
6703 * [`std::sync::Arc::strong_count`]
6704 * [`std::sync::Arc::weak_count`]
6705 * [`std::char::encode_utf8`]
6706 * [`std::char::encode_utf16`]
6707 * [`std::cell::Ref::clone`]
6708 * [`std::io::Take::into_inner`]
6713 * [The standard sorting algorithm has been rewritten for dramatic performance
6714 improvements][38192]. It is a hybrid merge sort, drawing influences from
6715 Timsort. Previously it was a naive merge sort.
6716 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6717 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6719 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6720 and `char_indices().last()`][37882]
6721 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6722 * [Chinese characters display correctly in `fmt::Debug`][37855]
6723 * [Derive `Default` for `Duration`][37699]
6724 * [Support creation of anonymous pipes on WinXP/2k][37677]
6725 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6726 * [Don't pass overlapped handles to processes][38835]
6731 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6732 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6733 should instead check the variable at runtime with `std::env`. That the value
6734 was set at build time was a bug, and incorrect when cross-compiling. This
6735 change is known to cause breakage.
6736 * [Add `--all` flag to `cargo test`][cargo/3221]
6737 * [Compile statically against the MSVC CRT][cargo/3363]
6738 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6739 * [Link OpenSSL statically on OSX][cargo/3311]
6740 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6741 * [Test for bad path overrides with summaries][cargo/3336]
6742 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6743 * [Fix retrying crate downloads for network errors][cargo/3348]
6744 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6745 * [Emit more info on --message-format=json][cargo/3319]
6746 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6747 * [Don't ignore errors in workspace manifest][cargo/3409]
6748 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6753 * [Test runners (binaries built with `--test`) now support a `--list` argument
6754 that lists the tests it contains][38185]
6755 * [Test runners now support a `--exact` argument that makes the test filter
6756 match exactly, instead of matching only a substring of the test name][38181]
6757 * [rustdoc supports a `--playground-url` flag][37763]
6758 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6763 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6764 continue to be used in this release by passing `--disable-rustbuild` to the
6765 configure script, but they will be deleted soon. Note that the new build
6766 system uses a different on-disk layout that will likely affect any scripts
6768 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6770 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6771 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6777 * [A number of minor changes to name resolution have been activated][37127].
6778 They add up to more consistent semantics, allowing for future evolution of
6779 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6780 details of what is different. The breaking changes here have been transitioned
6781 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6782 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6783 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6784 should instead check the variable at runtime with `std::env`. That the value
6785 was set at build time was a bug, and incorrect when cross-compiling. This
6786 change is known to cause breakage.
6787 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6788 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6789 1.10 and is now an error by default. It will become a hard error in the near
6791 * [The semantics relating modules to file system directories are changing in
6792 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6793 lint, which is a warning in this release, and will become a hard error in the
6795 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6796 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6797 the underlying iterator][37834]
6799 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6800 [33685]: https://github.com/rust-lang/rust/issues/33685
6801 [36868]: https://github.com/rust-lang/rust/pull/36868
6802 [37127]: https://github.com/rust-lang/rust/pull/37127
6803 [37229]: https://github.com/rust-lang/rust/pull/37229
6804 [37456]: https://github.com/rust-lang/rust/pull/37456
6805 [37527]: https://github.com/rust-lang/rust/pull/37527
6806 [37602]: https://github.com/rust-lang/rust/pull/37602
6807 [37613]: https://github.com/rust-lang/rust/pull/37613
6808 [37615]: https://github.com/rust-lang/rust/pull/37615
6809 [37636]: https://github.com/rust-lang/rust/pull/37636
6810 [37627]: https://github.com/rust-lang/rust/pull/37627
6811 [37642]: https://github.com/rust-lang/rust/pull/37642
6812 [37677]: https://github.com/rust-lang/rust/pull/37677
6813 [37699]: https://github.com/rust-lang/rust/pull/37699
6814 [37701]: https://github.com/rust-lang/rust/pull/37701
6815 [37705]: https://github.com/rust-lang/rust/pull/37705
6816 [37749]: https://github.com/rust-lang/rust/pull/37749
6817 [37760]: https://github.com/rust-lang/rust/pull/37760
6818 [37763]: https://github.com/rust-lang/rust/pull/37763
6819 [37764]: https://github.com/rust-lang/rust/pull/37764
6820 [37789]: https://github.com/rust-lang/rust/pull/37789
6821 [37791]: https://github.com/rust-lang/rust/pull/37791
6822 [37814]: https://github.com/rust-lang/rust/pull/37814
6823 [37817]: https://github.com/rust-lang/rust/pull/37817
6824 [37834]: https://github.com/rust-lang/rust/pull/37834
6825 [37848]: https://github.com/rust-lang/rust/pull/37848
6826 [37855]: https://github.com/rust-lang/rust/pull/37855
6827 [37882]: https://github.com/rust-lang/rust/pull/37882
6828 [37888]: https://github.com/rust-lang/rust/pull/37888
6829 [37973]: https://github.com/rust-lang/rust/pull/37973
6830 [37979]: https://github.com/rust-lang/rust/pull/37979
6831 [38086]: https://github.com/rust-lang/rust/pull/38086
6832 [38107]: https://github.com/rust-lang/rust/pull/38107
6833 [38117]: https://github.com/rust-lang/rust/pull/38117
6834 [38134]: https://github.com/rust-lang/rust/pull/38134
6835 [38146]: https://github.com/rust-lang/rust/pull/38146
6836 [38181]: https://github.com/rust-lang/rust/pull/38181
6837 [38182]: https://github.com/rust-lang/rust/pull/38182
6838 [38185]: https://github.com/rust-lang/rust/pull/38185
6839 [38192]: https://github.com/rust-lang/rust/pull/38192
6840 [38279]: https://github.com/rust-lang/rust/pull/38279
6841 [38835]: https://github.com/rust-lang/rust/pull/38835
6842 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6843 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6844 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6845 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6846 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6847 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6848 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6849 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6850 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6851 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6852 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6853 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6854 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6855 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6856 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6857 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6858 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6859 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6860 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6861 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6862 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6863 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6864 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6865 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6866 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6867 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6868 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6869 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6870 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6871 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6872 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6873 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6874 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6875 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6876 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6877 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6878 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6881 Version 1.14.0 (2016-12-22)
6882 ===========================
6887 * [`..` matches multiple tuple fields in enum variants, structs
6888 and tuples][36843]. [RFC 1492].
6889 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6890 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6891 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6892 dereferencing][36822]
6897 * [Mark enums with non-zero discriminant as non-zero][37224]
6898 * [Lower-case `static mut` names are linted like other
6899 statics and consts][37162]
6900 * [Fix ICE on some macros in const integer positions
6901 (e.g. `[u8; m!()]`)][36819]
6902 * [Improve error message and snippet for "did you mean `x`"][36798]
6903 * [Add a panic-strategy field to the target specification][36794]
6904 * [Include LLVM version in `--version --verbose`][37200]
6906 Compile-time Optimizations
6907 --------------------------
6909 * [Improve macro expansion performance][37569]
6910 * [Shrink `Expr_::ExprInlineAsm`][37445]
6911 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6912 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6913 * [Avoid more allocations when compiling html5ever][37373]
6914 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6915 * [Avoid some allocations in the macro parser][37318]
6916 * [Use a faster deflate setting][37298]
6917 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6918 during interning of slices][37270]
6919 * [Optimize `write_metadata`][37267]
6920 * [Don't process obligation forest cycles when stalled][37231]
6921 * [Avoid many `CrateConfig` clones][37161]
6922 * [Optimize `Substs::super_fold_with`][37108]
6923 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6924 * [Speed up `plug_leaks`][36917]
6929 * [`println!()`, with no arguments, prints newline][36825].
6930 Previously, an empty string was required to achieve the same.
6931 * [`Wrapping` impls standard binary and unary operators, as well as
6932 the `Sum` and `Product` iterators][37356]
6933 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6935 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6936 `VecDeque` iterators][37315]
6937 * [Improve `SipHasher` performance on small values][37312]
6938 * [Add Iterator trait TrustedLen to enable better FromIterator /
6940 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6941 * [`ReadDir` implements `Debug`][37221]
6942 * [Implement `RefUnwindSafe` for atomic types][37178]
6943 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6944 * [Avoid allocations in `Decoder::read_str`][37064]
6945 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6946 * [Impl `Debug` for raw pointers to unsized data][36880]
6947 * [Don't reuse `HashMap` random seeds][37470]
6948 * [The internal memory layout of `HashMap` is more cache-friendly, for
6949 significant improvements in some operations][36692]
6950 * [`HashMap` uses less memory on 32-bit architectures][36595]
6951 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6956 * [Expose rustc cfg values to build scripts][cargo/3243]
6957 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6958 * [Fix passing --features when testing multiple packages][cargo/3280]
6959 * [Use a single profile set per workspace][cargo/3249]
6960 * [Load `replace` sections from lock files][cargo/3220]
6961 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6966 * [rustup is the recommended Rust installation method][1.14rustup]
6967 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6968 S390x. These are [tier 2] platforms and may have major defects. Follow the
6969 instructions on the website to install, or add the targets to an existing
6970 installation with `rustup target add`. The new target triples are:
6971 - `mips-unknown-linux-gnu`
6972 - `mipsel-unknown-linux-gnu`
6973 - `mips64-unknown-linux-gnuabi64`
6974 - `mips64el-unknown-linux-gnuabi64 `
6975 - `powerpc-unknown-linux-gnu`
6976 - `powerpc64-unknown-linux-gnu`
6977 - `powerpc64le-unknown-linux-gnu`
6978 - `s390x-unknown-linux-gnu `
6979 * This release includes target (std) builds for ARM Linux running MUSL
6980 libc. These are [tier 2] platforms and may have major defects. Add the
6981 following triples to an existing rustup installation with `rustup target add`:
6982 - `arm-unknown-linux-musleabi`
6983 - `arm-unknown-linux-musleabihf`
6984 - `armv7-unknown-linux-musleabihf`
6985 * This release includes [experimental support for WebAssembly][1.14wasm], via
6986 the `wasm32-unknown-emscripten` target. This target is known to have major
6987 defects. Please test, report, and fix.
6988 * rustup no longer installs documentation by default. Run `rustup
6989 component add rust-docs` to install.
6990 * [Fix line stepping in debugger][37310]
6991 * [Enable line number debuginfo in releases][37280]
6996 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6997 * [Add support for Fuchsia OS][37313]
6998 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7003 * [A number of forward-compatibility lints used by the compiler
7004 to gradually introduce language changes have been converted
7005 to deny by default][36894]:
7006 - ["use of inaccessible extern crate erroneously allowed"][36886]
7007 - ["type parameter default erroneously allowed in invalid location"][36887]
7008 - ["detects super or self keywords at the beginning of global path"][36888]
7009 - ["two overlapping inherent impls define an item with the same name
7010 were erroneously allowed"][36889]
7011 - ["floating-point constants cannot be used in patterns"][36890]
7012 - ["constants of struct or enum type can only be used in a pattern if
7013 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7014 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7015 * [Prohibit patterns in trait methods without bodies][37378]
7016 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7017 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7018 * [The `$crate` macro variable is accepted in fewer locations][37213]
7019 * [Impls specifying extra region requirements beyond the trait
7020 they implement are rejected][37167]
7021 * [Enums may not be unsized][37111]. Unsized enums are intended to
7022 work but never have. For now they are forbidden.
7023 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7025 [tier 2]: https://forge.rust-lang.org/platform-support.html
7026 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7027 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7028 [36430]: https://github.com/rust-lang/rust/pull/36430
7029 [36595]: https://github.com/rust-lang/rust/pull/36595
7030 [36692]: https://github.com/rust-lang/rust/pull/36692
7031 [36767]: https://github.com/rust-lang/rust/pull/36767
7032 [36794]: https://github.com/rust-lang/rust/pull/36794
7033 [36798]: https://github.com/rust-lang/rust/pull/36798
7034 [36819]: https://github.com/rust-lang/rust/pull/36819
7035 [36822]: https://github.com/rust-lang/rust/pull/36822
7036 [36825]: https://github.com/rust-lang/rust/pull/36825
7037 [36843]: https://github.com/rust-lang/rust/pull/36843
7038 [36880]: https://github.com/rust-lang/rust/pull/36880
7039 [36886]: https://github.com/rust-lang/rust/issues/36886
7040 [36887]: https://github.com/rust-lang/rust/issues/36887
7041 [36888]: https://github.com/rust-lang/rust/issues/36888
7042 [36889]: https://github.com/rust-lang/rust/issues/36889
7043 [36890]: https://github.com/rust-lang/rust/issues/36890
7044 [36891]: https://github.com/rust-lang/rust/issues/36891
7045 [36892]: https://github.com/rust-lang/rust/issues/36892
7046 [36894]: https://github.com/rust-lang/rust/pull/36894
7047 [36917]: https://github.com/rust-lang/rust/pull/36917
7048 [36993]: https://github.com/rust-lang/rust/pull/36993
7049 [37037]: https://github.com/rust-lang/rust/pull/37037
7050 [37064]: https://github.com/rust-lang/rust/pull/37064
7051 [37094]: https://github.com/rust-lang/rust/pull/37094
7052 [37108]: https://github.com/rust-lang/rust/pull/37108
7053 [37111]: https://github.com/rust-lang/rust/pull/37111
7054 [37161]: https://github.com/rust-lang/rust/pull/37161
7055 [37162]: https://github.com/rust-lang/rust/pull/37162
7056 [37167]: https://github.com/rust-lang/rust/pull/37167
7057 [37178]: https://github.com/rust-lang/rust/pull/37178
7058 [37200]: https://github.com/rust-lang/rust/pull/37200
7059 [37213]: https://github.com/rust-lang/rust/pull/37213
7060 [37221]: https://github.com/rust-lang/rust/pull/37221
7061 [37224]: https://github.com/rust-lang/rust/pull/37224
7062 [37230]: https://github.com/rust-lang/rust/pull/37230
7063 [37231]: https://github.com/rust-lang/rust/pull/37231
7064 [37247]: https://github.com/rust-lang/rust/pull/37247
7065 [37267]: https://github.com/rust-lang/rust/pull/37267
7066 [37270]: https://github.com/rust-lang/rust/pull/37270
7067 [37273]: https://github.com/rust-lang/rust/pull/37273
7068 [37280]: https://github.com/rust-lang/rust/pull/37280
7069 [37298]: https://github.com/rust-lang/rust/pull/37298
7070 [37306]: https://github.com/rust-lang/rust/pull/37306
7071 [37310]: https://github.com/rust-lang/rust/pull/37310
7072 [37312]: https://github.com/rust-lang/rust/pull/37312
7073 [37313]: https://github.com/rust-lang/rust/pull/37313
7074 [37315]: https://github.com/rust-lang/rust/pull/37315
7075 [37318]: https://github.com/rust-lang/rust/pull/37318
7076 [37322]: https://github.com/rust-lang/rust/pull/37322
7077 [37326]: https://github.com/rust-lang/rust/pull/37326
7078 [37351]: https://github.com/rust-lang/rust/pull/37351
7079 [37356]: https://github.com/rust-lang/rust/pull/37356
7080 [37367]: https://github.com/rust-lang/rust/pull/37367
7081 [37373]: https://github.com/rust-lang/rust/pull/37373
7082 [37378]: https://github.com/rust-lang/rust/pull/37378
7083 [37389]: https://github.com/rust-lang/rust/pull/37389
7084 [37392]: https://github.com/rust-lang/rust/pull/37392
7085 [37427]: https://github.com/rust-lang/rust/pull/37427
7086 [37439]: https://github.com/rust-lang/rust/pull/37439
7087 [37445]: https://github.com/rust-lang/rust/pull/37445
7088 [37470]: https://github.com/rust-lang/rust/pull/37470
7089 [37569]: https://github.com/rust-lang/rust/pull/37569
7090 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7091 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7092 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7093 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7094 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7095 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7096 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7099 Version 1.13.0 (2016-11-10)
7100 ===========================
7105 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7106 errors, like the `try!` macro, described in [RFC 0243].
7107 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7108 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7109 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7110 * [Fix lifetime rules for 'if' conditions][36029]
7111 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7116 * [Add the `-C link-arg` argument][36574]
7117 * [Remove the old AST-based backend from rustc_trans][35764]
7118 * [Don't enable NEON by default on armv7 Linux][35814]
7119 * [Fix debug line number info for macro expansions][35238]
7120 * [Do not emit "class method" debuginfo for types that are not
7121 DICompositeType][36008]
7122 * [Warn about multiple conflicting #[repr] hints][34623]
7123 * [When sizing DST, don't double-count nested struct prefixes][36351]
7124 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7125 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7126 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7127 * [Expand macros without recursing to avoid stack overflows][36214]
7132 * [Replace macro backtraces with labeled local uses][35702]
7133 * [Improve error message for misplaced doc comments][33922]
7134 * [Buffer unix and lock windows to prevent message interleaving][35975]
7135 * [Update lifetime errors to specifically note temporaries][36171]
7136 * [Special case a few colors for Windows][36178]
7137 * [Suggest `use self` when such an import resolves][36289]
7138 * [Be more specific when type parameter shadows primitive type][36338]
7139 * Many minor improvements
7141 Compile-time Optimizations
7142 --------------------------
7144 * [Compute and cache HIR hashes at beginning][35854]
7145 * [Don't hash types in loan paths][36004]
7146 * [Cache projections in trans][35761]
7147 * [Optimize the parser's last token handling][36527]
7148 * [Only instantiate #[inline] functions in codegen units referencing
7149 them][36524]. This leads to big improvements in cases where crates export
7150 define many inline functions without using them directly.
7151 * [Lazily allocate TypedArena's first chunk][36592]
7152 * [Don't allocate during default HashSet creation][36734]
7159 * [`overflowing_abs`]
7160 * [`RefCell::try_borrow`]
7161 * [`RefCell::try_borrow_mut`]
7166 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7167 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7169 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7170 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7171 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7172 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7173 * [Use arc4rand on FreeBSD][35884]
7174 * [memrchr: Correct aligned offset computation][35969]
7175 * [Improve Demangling of Rust Symbols][36059]
7176 * [Use monotonic time in condition variables][35048]
7177 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7178 * [Implement conversion traits for `char`][35755]
7179 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7180 * [Zero first byte of CString on drop][36264]
7181 * [Inherit overflow checks for sum and product][36372]
7182 * [Add missing Eq implementations][36423]
7183 * [Implement `Debug` for `DirEntry`][36631]
7184 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7186 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7187 * [Implement more traits for `std::io::ErrorKind`][35911]
7188 * [Optimize BinaryHeap bounds checking][36072]
7189 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7190 `extend_with_element`][36355]
7191 * [Fix overflow checking in unsigned pow()][34942]
7196 * This release includes security fixes to both curl and OpenSSL.
7197 * [Fix transitive doctests when panic=abort][cargo/3021]
7198 * [Add --all-features flag to cargo][cargo/3038]
7199 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7200 * [Don't parse the home directory more than once][cargo/3078]
7201 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7202 * [Update OpenSSL to 1.0.2j][cargo/3121]
7203 * [Add license and license_file to cargo metadata output][cargo/3110]
7204 * [Make crates-io registry URL optional in config; ignore all changes to
7205 source.crates-io][cargo/3089]
7206 * [Don't download dependencies from other platforms][cargo/3123]
7207 * [Build transitive dev-dependencies when needed][cargo/3125]
7208 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7209 * [Avoid updating registry when adding existing deps][cargo/3144]
7210 * [Warn about path overrides that won't work][cargo/3136]
7211 * [Use workspaces during `cargo install`][cargo/3146]
7212 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7213 * [Add --message-format flag][cargo/3000]
7214 * [Pass target environment for rustdoc][cargo/3205]
7215 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7216 * [Update curl and curl-sys][cargo/3241]
7217 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7222 * [rustdoc: Add the `--sysroot` argument][36586]
7223 * [rustdoc: Fix a couple of issues with the search results][35655]
7224 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7225 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7226 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7231 * [Remove unmaintained style guide][35124]
7232 * [Add s390x support][36369]
7233 * [Initial work at Haiku OS support][36727]
7234 * [Add mips-uclibc targets][35734]
7235 * [Crate-ify compiler-rt into compiler-builtins][35021]
7236 * [Add rustc version info (git hash + date) to dist tarball][36213]
7237 * Many documentation improvements
7242 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7243 * [Deny (by default) transmuting from fn item types to pointer-sized
7244 types][34923]. Continuing the long transition to zero-sized fn items,
7246 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7248 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7249 * [Fix lifetime rules for 'if' conditions][36029].
7250 * [Inherit overflow checks for sum and product][36372].
7251 * [Forbid user-defined macros named "macro_rules"][36730].
7253 [33922]: https://github.com/rust-lang/rust/pull/33922
7254 [34623]: https://github.com/rust-lang/rust/pull/34623
7255 [34923]: https://github.com/rust-lang/rust/pull/34923
7256 [34942]: https://github.com/rust-lang/rust/pull/34942
7257 [35021]: https://github.com/rust-lang/rust/pull/35021
7258 [35048]: https://github.com/rust-lang/rust/pull/35048
7259 [35074]: https://github.com/rust-lang/rust/pull/35074
7260 [35124]: https://github.com/rust-lang/rust/pull/35124
7261 [35234]: https://github.com/rust-lang/rust/pull/35234
7262 [35238]: https://github.com/rust-lang/rust/pull/35238
7263 [35354]: https://github.com/rust-lang/rust/pull/35354
7264 [35559]: https://github.com/rust-lang/rust/pull/35559
7265 [35585]: https://github.com/rust-lang/rust/pull/35585
7266 [35627]: https://github.com/rust-lang/rust/pull/35627
7267 [35655]: https://github.com/rust-lang/rust/pull/35655
7268 [35702]: https://github.com/rust-lang/rust/pull/35702
7269 [35707]: https://github.com/rust-lang/rust/pull/35707
7270 [35728]: https://github.com/rust-lang/rust/pull/35728
7271 [35734]: https://github.com/rust-lang/rust/pull/35734
7272 [35755]: https://github.com/rust-lang/rust/pull/35755
7273 [35761]: https://github.com/rust-lang/rust/pull/35761
7274 [35764]: https://github.com/rust-lang/rust/pull/35764
7275 [35814]: https://github.com/rust-lang/rust/pull/35814
7276 [35854]: https://github.com/rust-lang/rust/pull/35854
7277 [35871]: https://github.com/rust-lang/rust/pull/35871
7278 [35884]: https://github.com/rust-lang/rust/pull/35884
7279 [35911]: https://github.com/rust-lang/rust/pull/35911
7280 [35969]: https://github.com/rust-lang/rust/pull/35969
7281 [35975]: https://github.com/rust-lang/rust/pull/35975
7282 [36004]: https://github.com/rust-lang/rust/pull/36004
7283 [36008]: https://github.com/rust-lang/rust/pull/36008
7284 [36014]: https://github.com/rust-lang/rust/pull/36014
7285 [36029]: https://github.com/rust-lang/rust/pull/36029
7286 [36059]: https://github.com/rust-lang/rust/pull/36059
7287 [36072]: https://github.com/rust-lang/rust/pull/36072
7288 [36101]: https://github.com/rust-lang/rust/pull/36101
7289 [36104]: https://github.com/rust-lang/rust/pull/36104
7290 [36171]: https://github.com/rust-lang/rust/pull/36171
7291 [36173]: https://github.com/rust-lang/rust/pull/36173
7292 [36178]: https://github.com/rust-lang/rust/pull/36178
7293 [36213]: https://github.com/rust-lang/rust/pull/36213
7294 [36214]: https://github.com/rust-lang/rust/pull/36214
7295 [36264]: https://github.com/rust-lang/rust/pull/36264
7296 [36266]: https://github.com/rust-lang/rust/pull/36266
7297 [36289]: https://github.com/rust-lang/rust/pull/36289
7298 [36338]: https://github.com/rust-lang/rust/pull/36338
7299 [36351]: https://github.com/rust-lang/rust/pull/36351
7300 [36355]: https://github.com/rust-lang/rust/pull/36355
7301 [36369]: https://github.com/rust-lang/rust/pull/36369
7302 [36372]: https://github.com/rust-lang/rust/pull/36372
7303 [36423]: https://github.com/rust-lang/rust/pull/36423
7304 [36482]: https://github.com/rust-lang/rust/pull/36482
7305 [36505]: https://github.com/rust-lang/rust/pull/36505
7306 [36524]: https://github.com/rust-lang/rust/pull/36524
7307 [36527]: https://github.com/rust-lang/rust/pull/36527
7308 [36551]: https://github.com/rust-lang/rust/pull/36551
7309 [36574]: https://github.com/rust-lang/rust/pull/36574
7310 [36586]: https://github.com/rust-lang/rust/pull/36586
7311 [36592]: https://github.com/rust-lang/rust/pull/36592
7312 [36631]: https://github.com/rust-lang/rust/pull/36631
7313 [36721]: https://github.com/rust-lang/rust/pull/36721
7314 [36727]: https://github.com/rust-lang/rust/pull/36727
7315 [36730]: https://github.com/rust-lang/rust/pull/36730
7316 [36734]: https://github.com/rust-lang/rust/pull/36734
7317 [36754]: https://github.com/rust-lang/rust/pull/36754
7318 [36995]: https://github.com/rust-lang/rust/pull/36995
7319 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7320 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7321 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7322 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7323 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7324 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7325 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7326 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7327 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7328 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7329 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7330 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7331 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7332 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7333 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7334 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7335 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7336 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7337 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7338 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7339 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7340 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7341 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7342 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7343 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7344 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7345 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7346 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7347 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7348 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7349 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7350 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7353 Version 1.12.1 (2016-10-20)
7354 ===========================
7359 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7360 * [Confusion with double negation and booleans][36856]
7361 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7362 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7363 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7364 * [Corrupted memory after updated to 1.12][36936]
7365 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7366 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7367 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7369 [36381]: https://github.com/rust-lang/rust/issues/36381
7370 [36856]: https://github.com/rust-lang/rust/issues/36856
7371 [36875]: https://github.com/rust-lang/rust/issues/36875
7372 [36924]: https://github.com/rust-lang/rust/issues/36924
7373 [36926]: https://github.com/rust-lang/rust/issues/36926
7374 [36936]: https://github.com/rust-lang/rust/issues/36936
7375 [37026]: https://github.com/rust-lang/rust/issues/37026
7376 [37112]: https://github.com/rust-lang/rust/issues/37112
7377 [37153]: https://github.com/rust-lang/rust/issues/37153
7380 Version 1.12.0 (2016-09-29)
7381 ===========================
7386 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7387 This translation pass is far simpler than the previous AST->LLVM pass, and
7388 creates opportunities to perform new optimizations directly on the MIR. It
7389 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7390 * [`rustc` presents a new, more readable error format, along with
7391 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7392 Most common editors supporting Rust have been updated to work with it. It was
7393 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7398 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7399 This translation pass is far simpler than the previous AST->LLVM pass, and
7400 creates opportunities to perform new optimizations directly on the MIR. It
7401 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7402 * [Print the Rust target name, not the LLVM target name, with
7403 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7404 * [The computation of `TypeId` is correct in some cases where it was previously
7405 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7406 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7407 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7408 `--print relocation-models`, and `--print code-models` print the available
7409 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7410 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7411 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7412 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7413 These targets produce statically-linked binaries. There are no binary release
7419 * [`rustc` presents a new, more readable error format, along with
7420 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7421 Most common editors supporting Rust have been updated to work with it. It was
7422 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7423 * [In error descriptions, references are now described in plain English,
7424 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7425 * [In error type descriptions, unknown numeric types are named `{integer}` or
7426 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7427 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7432 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7433 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7434 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7435 useful](https://github.com/rust-lang/rust/pull/34908)
7436 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7437 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7438 * [Semicolons are properly required as statement delimiters inside
7439 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7440 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7445 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7446 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7447 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7448 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7449 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7450 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7451 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7452 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7453 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7454 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7455 Both on Unix and Windows.
7456 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7457 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7458 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7459 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7460 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7461 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7462 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7463 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7468 * [The `format!` macro and friends now allow a single argument to be formatted
7469 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7470 * [The lifetime bounds on `[T]::binary_search_by` and
7471 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7472 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7473 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7474 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7475 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7476 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7477 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7478 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7479 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7480 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7481 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7482 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7483 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7484 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7485 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7486 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7487 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7488 * [`mpsc::sync_channel` `Receiver`s return any available message before
7489 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7490 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7491 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7496 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7497 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7498 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7499 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7500 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7501 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7502 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7503 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7504 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7505 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7506 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7507 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7508 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7509 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7510 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7511 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7516 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7517 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7522 * [Test binaries now support a `--test-threads` argument to specify the number
7523 of threads used to run tests, and which acts the same as the
7524 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7525 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7526 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7527 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7528 * [Rust releases now come with source packages that can be installed by rustup
7529 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7530 The resulting source code can be used by tools and IDES, located in the
7531 sysroot under `lib/rustlib/src`.
7536 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7537 * Many minor improvements to the documentation.
7538 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7543 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7544 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7545 * [When formatting strings, if "precision" is specified, the "fill",
7546 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7547 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7550 Version 1.11.0 (2016-08-18)
7551 ===========================
7556 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7557 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7558 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7559 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7564 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7565 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7566 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7567 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7568 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7569 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7570 (in libcore - previously stabilized in libstd)
7571 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7572 (in libcore - previously stabilized in libstd)
7573 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7574 (in libcore - previously stabilized in libstd)
7575 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7576 (in libcore - previously stabilized in libstd)
7577 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7578 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7579 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7580 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7585 * [The `thread_local!` macro supports multiple definitions in a single
7586 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7587 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7588 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7589 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7590 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7591 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7592 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7593 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7598 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7599 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7600 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7601 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7602 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7603 and `-vv` prints warnings for all crates.
7604 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7605 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7606 This provides room for expansion by arbitrary tools.
7607 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7608 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7609 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7610 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7611 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7612 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7613 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7618 * [Caching projections speeds up type check dramatically for some
7619 workloads](https://github.com/rust-lang/rust/pull/33816)
7620 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7621 This hasher is faster, but is believed to provide sufficient
7622 protection from collision attacks.
7623 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7628 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7629 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7630 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7631 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7632 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7637 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7638 * [When emitting debug info, rustc emits frame pointers for closures,
7639 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7640 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7641 * Many more errors have been given error codes and extended
7643 * API documentation continues to be improved, with many new examples
7648 * [rustc no longer hangs when dependencies recursively re-export
7649 submodules](https://github.com/rust-lang/rust/pull/34542)
7650 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7651 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7652 rewritten](https://github.com/rust-lang/rust/pull/33895)
7653 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7654 No targets use this yet, but it works toward AVR support.
7659 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7660 * [The new follow-set rules that place restrictions on `macro_rules!`
7661 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7662 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7663 and has been a warning since 1.10.
7664 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7665 This causes breakage in some corner cases.
7668 Version 1.10.0 (2016-07-07)
7669 ===========================
7674 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7675 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7676 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7677 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7678 * [`panic!` can be converted to a runtime abort with the
7679 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7680 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7681 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7682 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7683 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7684 Note that Cargo does not yet directly support cdylibs.
7689 * `os::windows::fs::OpenOptionsExt::access_mode`
7690 * `os::windows::fs::OpenOptionsExt::share_mode`
7691 * `os::windows::fs::OpenOptionsExt::custom_flags`
7692 * `os::windows::fs::OpenOptionsExt::attributes`
7693 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7694 * `os::unix::fs::OpenOptionsExt::custom_flags`
7695 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7696 * `Default for sync::Weak`
7697 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7698 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7699 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7700 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7701 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7702 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7703 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7704 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7705 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7706 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7707 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7708 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7709 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7710 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7711 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7712 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7713 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7714 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7715 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7716 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7717 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7718 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7719 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7720 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7721 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7722 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7723 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7724 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7725 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7726 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7727 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7728 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7729 * Read/Write/RawFd impls for `UnixStream`
7730 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7731 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7732 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7733 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7734 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7735 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7736 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7737 * RawFd impls for `UnixListener`
7738 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7739 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7740 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7741 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7742 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7743 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7744 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7745 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7746 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7747 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7748 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7749 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7750 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7751 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7752 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7753 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7754 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7755 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7756 * RawFd impls for `UnixDatagram`
7757 * `{BTree,Hash}Map::values_mut`
7758 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7763 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7764 The semantics of this minor method are subtle and probably not what
7766 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7767 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7768 will fall back to `/dev/urandom` temporarily to avoid blocking
7769 during early boot](https://github.com/rust-lang/rust/pull/33086).
7770 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7771 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7772 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7773 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7774 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7775 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7776 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7780 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7781 This controls the runtime behavior of the `panic!` macro
7782 and can be either "unwind" (the default), or "abort".
7783 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7784 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7785 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7786 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7787 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7788 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7789 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7790 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7791 By default they are retried twice, which can be customized with the
7792 `net.retry` value in `.cargo/config`.
7793 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7794 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7795 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7796 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7797 Makes it possible to install multiple crates in parallel.
7798 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7799 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7800 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7801 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7802 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7803 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7808 * [rustc memory usage was reduced by refactoring the context used for
7809 type checking](https://github.com/rust-lang/rust/pull/33425).
7810 * [Speed up creation of `HashMap`s by caching the random keys used
7811 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7812 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7813 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7814 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7815 10x faster than the previous lookup tables.
7816 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7821 * Many incremental improvements to documentation and rustdoc.
7822 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7823 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7824 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7825 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7826 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7827 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7828 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7833 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7834 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7835 * [`std` no longer prints backtraces on platforms where the running
7836 module must be loaded with `env::current_exe`, which can't be relied
7837 on](https://github.com/rust-lang/rust/pull/33554).
7838 * This release includes std binaries for the i586-unknown-linux-gnu,
7839 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7840 i586 target is for old x86 hardware without SSE2, and the armv7
7841 target is for Android running on modern ARM architectures.
7842 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7843 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7844 * [On Unix the runtime aborts by calling `libc::abort` instead of
7845 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7846 * [Rust is now bootstrapped from the previous release of Rust,
7847 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7852 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7853 * [`target_env` for Linux ARM targets is just `gnu`, not
7854 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7855 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7856 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7857 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7858 Affects how macros are parsed.
7859 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7860 * [Feature-gated attributes on macro-generated macro invocations are
7861 now rejected](https://github.com/rust-lang/rust/pull/32791).
7862 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7863 This caused some minor changes to type inference.
7866 Version 1.9.0 (2016-05-26)
7867 ==========================
7872 * The `#[deprecated]` attribute when applied to an API will generate
7873 warnings when used. The warnings may be suppressed with
7874 `#[allow(deprecated)]`. [RFC 1270].
7875 * [`fn` item types are zero sized, and each `fn` names a unique
7876 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7877 `transmute` on a `fn` type will generate a warning for a few cycles,
7878 then will be converted to an error.
7879 * [Field and method resolution understand visibility, so private
7880 fields and methods cannot prevent the proper use of public fields
7881 and methods][1.9fv].
7882 * [The parser considers unicode codepoints in the
7883 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7889 * [`std::panic::catch_unwind`] (renamed from `recover`)
7890 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7891 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7892 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7893 * [`str::is_char_boundary`]
7894 * [`<*const T>::as_ref`]
7895 * [`<*mut T>::as_ref`]
7896 * [`<*mut T>::as_mut`]
7897 * [`AsciiExt::make_ascii_uppercase`]
7898 * [`AsciiExt::make_ascii_lowercase`]
7899 * [`char::decode_utf16`]
7900 * [`char::DecodeUtf16`]
7901 * [`char::DecodeUtf16Error`]
7902 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7903 * [`BTreeSet::take`]
7904 * [`BTreeSet::replace`]
7907 * [`HashSet::replace`]
7909 * [`OsString::with_capacity`]
7910 * [`OsString::clear`]
7911 * [`OsString::capacity`]
7912 * [`OsString::reserve`]
7913 * [`OsString::reserve_exact`]
7914 * [`OsStr::is_empty`]
7916 * [`std::os::unix::thread`]
7919 * [`JoinHandleExt::as_pthread_t`]
7920 * [`JoinHandleExt::into_pthread_t`]
7921 * [`HashSet::hasher`]
7922 * [`HashMap::hasher`]
7923 * [`CommandExt::exec`]
7924 * [`File::try_clone`]
7925 * [`SocketAddr::set_ip`]
7926 * [`SocketAddr::set_port`]
7927 * [`SocketAddrV4::set_ip`]
7928 * [`SocketAddrV4::set_port`]
7929 * [`SocketAddrV6::set_ip`]
7930 * [`SocketAddrV6::set_port`]
7931 * [`SocketAddrV6::set_flowinfo`]
7932 * [`SocketAddrV6::set_scope_id`]
7933 * [`slice::copy_from_slice`]
7934 * [`ptr::read_volatile`]
7935 * [`ptr::write_volatile`]
7936 * [`OpenOptions::create_new`]
7937 * [`TcpStream::set_nodelay`]
7938 * [`TcpStream::nodelay`]
7939 * [`TcpStream::set_ttl`]
7940 * [`TcpStream::ttl`]
7941 * [`TcpStream::set_only_v6`]
7942 * [`TcpStream::only_v6`]
7943 * [`TcpStream::take_error`]
7944 * [`TcpStream::set_nonblocking`]
7945 * [`TcpListener::set_ttl`]
7946 * [`TcpListener::ttl`]
7947 * [`TcpListener::set_only_v6`]
7948 * [`TcpListener::only_v6`]
7949 * [`TcpListener::take_error`]
7950 * [`TcpListener::set_nonblocking`]
7951 * [`UdpSocket::set_broadcast`]
7952 * [`UdpSocket::broadcast`]
7953 * [`UdpSocket::set_multicast_loop_v4`]
7954 * [`UdpSocket::multicast_loop_v4`]
7955 * [`UdpSocket::set_multicast_ttl_v4`]
7956 * [`UdpSocket::multicast_ttl_v4`]
7957 * [`UdpSocket::set_multicast_loop_v6`]
7958 * [`UdpSocket::multicast_loop_v6`]
7959 * [`UdpSocket::set_multicast_ttl_v6`]
7960 * [`UdpSocket::multicast_ttl_v6`]
7961 * [`UdpSocket::set_ttl`]
7962 * [`UdpSocket::ttl`]
7963 * [`UdpSocket::set_only_v6`]
7964 * [`UdpSocket::only_v6`]
7965 * [`UdpSocket::join_multicast_v4`]
7966 * [`UdpSocket::join_multicast_v6`]
7967 * [`UdpSocket::leave_multicast_v4`]
7968 * [`UdpSocket::leave_multicast_v6`]
7969 * [`UdpSocket::take_error`]
7970 * [`UdpSocket::connect`]
7971 * [`UdpSocket::send`]
7972 * [`UdpSocket::recv`]
7973 * [`UdpSocket::set_nonblocking`]
7978 * [`std::sync::Once` is poisoned if its initialization function
7980 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7981 * [Most types implement `fmt::Debug`][1.9db].
7982 * [The default buffer size used by `BufReader` and `BufWriter` was
7983 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7984 used by other languages.
7985 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7986 `Duration` additionally implements `*=` and `/=`][1.9ta].
7987 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7988 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7989 * [`Chain` implements `BufRead`][1.9ch].
7990 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7995 * [Cargo can now run concurrently][1.9cc].
7996 * [Top-level overrides allow specific revisions of crates to be
7997 overridden through the entire crate graph][1.9ct]. This is intended
7998 to make upgrades easier for large projects, by allowing crates to be
7999 forked temporarily until they've been upgraded and republished.
8000 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8001 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8002 on the commandline][1.9cf]. `rustc` arguments can also be specified
8003 in the `build.rustflags` configuration key.
8008 * [The time complexity of comparing variables for equivalence during type
8009 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8010 to major compilation time improvement in some scenarios.
8011 * [`ToString` is specialized for `str`, giving it the same performance
8012 as `to_owned`][1.9ts].
8013 * [Spawning processes with `Command::output` no longer creates extra
8015 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8016 for C-like enums][1.9cl].
8021 * [Passing the `--quiet` flag to a test runner will produce
8022 much-abbreviated output][1.9q].
8023 * The Rust Project now publishes std binaries for the
8024 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8025 `i586-pc-windows-msvc` targets.
8030 * [`std::sync::Once` is poisoned if its initialization function
8032 * [It is illegal to define methods with the same name in overlapping
8033 inherent `impl` blocks][1.9sn].
8034 * [`fn` item types are zero sized, and each `fn` names a unique
8035 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8036 `transmute` on a `fn` type will generate a warning for a few cycles,
8037 then will be converted to an error.
8038 * [Improvements to const evaluation may trigger new errors when integer
8039 literals are out of range][1.9ce].
8042 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8043 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8044 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8045 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8046 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8047 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8048 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8049 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8050 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8051 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8052 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8053 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8054 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8055 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8056 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8057 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8058 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8059 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8060 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8061 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8062 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8063 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8064 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8065 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8066 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8067 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8068 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8069 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8070 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8071 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8072 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8073 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8074 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8075 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8076 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8077 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8078 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8079 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8080 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8081 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8082 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8083 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8084 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8085 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8086 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8087 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8088 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8089 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8090 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8091 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8092 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8093 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8094 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8095 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8096 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8097 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8098 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8099 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8100 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8101 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8102 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8103 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8104 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8105 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8106 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8107 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8108 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8109 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8110 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8111 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8112 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8113 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8114 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8115 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8116 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8117 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8118 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8119 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8120 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8121 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8122 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8123 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8124 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8125 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8126 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8127 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8128 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8129 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8130 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8131 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8132 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8133 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8134 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8135 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8136 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8137 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8138 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8139 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8140 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8141 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8142 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8143 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8144 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8145 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8146 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8147 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8148 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8149 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8150 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8151 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8154 Version 1.8.0 (2016-04-14)
8155 ==========================
8160 * Rust supports overloading of compound assignment statements like
8161 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8162 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8163 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8165 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8166 addition to the non-braced form, `struct Foo;`. [RFC 218].
8172 * [`str::encode_utf16`] (renamed from `utf16_units`)
8173 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8176 * [`ptr::drop_in_place`]
8178 * [`time::SystemTime`]
8180 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8181 * [`Instant::elapsed`]
8182 * [`SystemTime::now`]
8183 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8184 * [`SystemTime::elapsed`]
8185 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8186 * [`SystemTimeError`]
8187 * [`SystemTimeError::duration`]
8188 * Various impls for `SystemTimeError`
8190 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8191 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8192 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8193 * [The `write!` and `writeln!` macros correctly emit errors if any of
8194 their arguments can't be formatted][1.8w].
8195 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8196 * [The Unix-specific `raw` modules, which contain a number of
8197 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8198 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8199 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8200 across platforms was making it difficult to implement `std`
8201 correctly. Those that need these definitions should use the `libc`
8203 * The Unix-specific `MetadataExt` traits, including
8204 `os::unix::fs::MetadataExt`, which expose values such as inode
8205 numbers [no longer return platform-specific types][1.8r], but
8206 instead return widened integers. [RFC 1415].
8207 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8208 * [Atomic loads and stores are not volatile][1.8a].
8209 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8214 * [Inlining hash functions lead to a 3% compile-time improvement in
8215 some workloads][1.8h].
8216 * When using jemalloc, its symbols are [unprefixed so that it
8217 overrides the libc malloc implementation][1.8h]. This means that for
8218 rustc, LLVM is now using jemalloc, which results in a 6%
8219 compile-time improvement on a specific workload.
8220 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8225 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8226 i686-pc-windows-msvc is now considered a tier-1 platform.
8227 * [The `--print targets` flag prints a list of supported targets][1.8t].
8228 * [The `--print cfg` flag prints the `cfg`s defined for the current
8230 * [`rustc` can be built with an new Cargo-based build system, written
8231 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8232 build system. To enable it configure with `configure --rustbuild`.
8233 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8234 variants while also indicating the total number of missing variants
8235 if more than 3][1.8m].
8236 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8237 * The Rust Project now publishes binary releases of the standard
8238 library for a number of tier-2 targets:
8239 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8240 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8241 `x86_64-rumprun-netbsd`. These can be installed with
8242 tools such as [multirust][1.8mr].
8247 * [`cargo init` creates a new Cargo project in the current
8248 directory][1.8ci]. It is otherwise like `cargo new`.
8249 * [Cargo has configuration keys for `-v` and
8250 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8251 `[term]` section of `.cargo/config`.
8252 * [Configuration keys that evaluate to strings or integers can be set
8253 via environment variables][1.8ce]. For example the `build.jobs` key
8254 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8255 precedence over config files.
8256 * [Target-specific dependencies support Rust `cfg` syntax for
8257 describing targets][1.8cfg] so that dependencies for multiple
8258 targets can be specified together. [RFC 1361].
8259 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8260 `RUSTDOC` take precedence over the `build.target-dir`,
8261 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8262 * [The child process tree is killed on Windows when Cargo is
8264 * [The `build.target` configuration value sets the target platform,
8265 like `--target`][1.8ct].
8270 * [Unstable compiler flags have been further restricted][1.8u]. Since
8271 1.0 `-Z` flags have been considered unstable, and other flags that
8272 were considered unstable additionally required passing `-Z
8273 unstable-options` to access. Unlike unstable language and library
8274 features though, these options have been accessible on the stable
8275 release channel. Going forward, *new unstable flags will not be
8276 available on the stable release channel*, and old unstable flags
8277 will warn about their usage. In the future, all unstable flags will
8278 be unavailable on the stable release channel.
8279 * [It is no longer possible to `match` on empty enum variants using
8280 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8281 * The Unix-specific `MetadataExt` traits, including
8282 `os::unix::fs::MetadataExt`, which expose values such as inode
8283 numbers [no longer return platform-specific types][1.8r], but
8284 instead return widened integers. [RFC 1415].
8285 * [Modules sourced from the filesystem cannot appear within arbitrary
8286 blocks, but only within other modules][1.8mf].
8287 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8288 * On Unix, [stack overflow triggers a runtime abort instead of a
8290 * [`Command::spawn` and its equivalents return an error if any of
8291 its command-line arguments contain interior `NUL`s][1.8n].
8292 * [Tuple and unit enum variants from other crates are in the type
8294 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8295 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8296 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8297 instead of `foo.lib`.
8300 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8301 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8302 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8303 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8304 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8305 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8306 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8307 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8308 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8309 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8310 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8311 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8312 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8313 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8314 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8315 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8316 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8317 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8318 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8319 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8320 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8321 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8322 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8323 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8324 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8325 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8326 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8327 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8328 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8329 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8330 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8331 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8332 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8333 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8334 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8335 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8336 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8337 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8338 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8339 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8340 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8341 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8342 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8343 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8344 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8345 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8346 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8347 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8348 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8349 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8350 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8351 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8352 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8353 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8354 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8355 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8356 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8357 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8358 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8359 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8362 Version 1.7.0 (2016-03-03)
8363 ==========================
8370 * [`Path::strip_prefix`] (renamed from relative_from)
8371 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8373 * [`Ipv4Addr::is_loopback`]
8374 * [`Ipv4Addr::is_private`]
8375 * [`Ipv4Addr::is_link_local`]
8376 * [`Ipv4Addr::is_multicast`]
8377 * [`Ipv4Addr::is_broadcast`]
8378 * [`Ipv4Addr::is_documentation`]
8380 * [`Ipv6Addr::is_unspecified`]
8381 * [`Ipv6Addr::is_loopback`]
8382 * [`Ipv6Addr::is_multicast`]
8385 * [`Vec::as_mut_slice`]
8387 * [`String::as_str`]
8388 * [`String::as_mut_str`]
8390 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8392 * `<[T]>::`[`sort_by_key`]
8393 * checked, saturated, and overflowing operations
8394 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8395 * [`i32::saturating_mul`]
8396 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8397 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8398 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8399 * [`u32::saturating_mul`]
8400 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8401 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8402 * and checked, saturated, and overflowing operations for other primitive types
8404 * [`ffi::IntoStringError`]
8405 * [`CString::into_string`]
8406 * [`CString::into_bytes`]
8407 * [`CString::into_bytes_with_nul`]
8408 * `From<CString> for Vec<u8>`
8410 * [`IntoStringError::into_cstring`]
8411 * [`IntoStringError::utf8_error`]
8412 * `Error for IntoStringError`
8414 * [`std::hash::BuildHasher`]
8415 * [`BuildHasher::Hasher`]
8416 * [`BuildHasher::build_hasher`]
8417 * [`std::hash::BuildHasherDefault`]
8418 * [`HashMap::with_hasher`]
8419 * [`HashMap::with_capacity_and_hasher`]
8420 * [`HashSet::with_hasher`]
8421 * [`HashSet::with_capacity_and_hasher`]
8422 * [`std::collections::hash_map::RandomState`]
8423 * [`RandomState::new`]
8424 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8425 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8426 from bytes is faster.
8427 * [The performance of `LineWriter` (and thus `io::stdout`) was
8428 improved by using `memchr` to search for newlines][1.7m].
8429 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8430 `f64` variants were stabilized previously.
8431 * [`BTreeMap` was rewritten to use less memory and improve the performance
8432 of insertion and iteration, the latter by as much as 5x][1.7bm].
8433 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8434 covariant over their contained type][1.7bt].
8435 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8436 over their contained type][1.7ll].
8437 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8439 * [`Any` is implemented for unsized types][1.7a].
8440 * [`Hash` is implemented for `Duration`][1.7h].
8445 * [When running tests with `--test`, rustdoc will pass `--cfg`
8446 arguments to the compiler][1.7dt].
8447 * [The compiler is built with RPATH information by default][1.7rpa].
8448 This means that it will be possible to run `rustc` when installed in
8449 unusual configurations without configuring the dynamic linker search
8451 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8452 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8453 over `LD_LIBRARY_PATH`.
8458 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8459 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8460 * [The `rerun-if-changed` build script directive no longer causes the
8461 build script to incorrectly run twice in certain scenarios][1.7rr].
8466 * Soundness fixes to the interactions between associated types and
8467 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8468 code that violates the new rules. This is a significant change that
8469 is known to break existing code, so it has emitted warnings for the
8470 new error cases since 1.4 to give crate authors time to adapt. The
8471 details of what is changing are subtle; read the RFC for more.
8472 * [Several bugs in the compiler's visibility calculations were
8473 fixed][1.7v]. Since this was found to break significant amounts of
8474 code, the new errors will be emitted as warnings for several release
8475 cycles, under the `private_in_public` lint.
8476 * Defaulted type parameters were accidentally accepted in positions
8477 that were not intended. In this release, [defaulted type parameters
8478 appearing outside of type definitions will generate a
8479 warning][1.7d], which will become an error in future releases.
8480 * [Parsing "." as a float results in an error instead of 0][1.7p].
8481 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8482 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8484 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8485 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8486 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8487 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8488 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8489 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8490 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8491 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8492 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8493 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8494 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8495 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8496 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8497 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8498 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8499 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8500 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8501 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8502 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8503 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8504 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8505 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8506 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8507 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8508 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8509 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8510 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8511 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8512 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8513 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8514 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8515 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8516 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8517 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8518 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8519 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8520 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8521 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8522 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8523 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8524 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8525 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8526 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8527 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8528 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8529 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8530 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8531 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8532 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8533 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8534 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8535 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8536 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8537 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8538 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8539 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8540 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8541 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8542 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8543 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8544 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8545 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8546 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8547 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8548 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8549 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8550 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8551 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8552 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8553 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8554 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8555 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8556 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8557 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8558 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8559 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8560 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8561 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8562 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8565 Version 1.6.0 (2016-01-21)
8566 ==========================
8571 * The `#![no_std]` attribute causes a crate to not be linked to the
8572 standard library, but only the [core library][1.6co], as described
8573 in [RFC 1184]. The core library defines common types and traits but
8574 has no platform dependencies whatsoever, and is the basis for Rust
8575 software in environments that cannot support a full port of the
8576 standard library, such as operating systems. Most of the core
8577 library is now stable.
8583 [`Read::read_exact`],
8584 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8585 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8586 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8587 [`os::unix::fs::DirBuilderExt`],
8588 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8589 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8590 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8591 [`collections::hash_map::Drain`],
8592 [`collections::hash_map::HashMap::drain`],
8593 [`collections::hash_set::Drain`],
8594 [`collections::hash_set::HashSet::drain`],
8595 [`collections::binary_heap::Drain`],
8596 [`collections::binary_heap::BinaryHeap::drain`],
8597 [`Vec::extend_from_slice`] (renamed from `push_all`),
8598 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8599 [`RwLock::into_inner`],
8600 [`Iterator::min_by_key`] (renamed from `min_by`),
8601 [`Iterator::max_by_key`] (renamed from `max_by`).
8602 * The [core library][1.6co] is stable, as are most of its APIs.
8603 * [The `assert_eq!` macro supports arguments that don't implement
8604 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8606 * Several timer functions that take duration in milliseconds [are
8607 deprecated in favor of those that take `Duration`][1.6ms]. These
8608 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8609 `thread::park_timeout_ms`.
8610 * The algorithm by which `Vec` reserves additional elements was
8611 [tweaked to not allocate excessive space][1.6a] while still growing
8613 * `From` conversions are [implemented from integers to floats][1.6f]
8614 in cases where the conversion is lossless. Thus they are not
8615 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8616 or `f64`. They are also not implemented for `isize` and `usize`
8617 because the implementations would be platform-specific. `From` is
8618 also implemented from `f32` to `f64`.
8619 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8620 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8621 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8622 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8624 * Sorting slices that are already sorted [is 50% faster in some
8630 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8631 * Cargo build scripts can specify their dependencies by emitting the
8632 [`rerun-if-changed`][1.6rr] key.
8633 * crates.io will reject publication of crates with dependencies that
8634 have a wildcard version constraint. Crates with wildcard
8635 dependencies were seen to cause a variety of problems, as described
8636 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8638 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8639 release folder. A variety of artifacts that Cargo failed to clean
8640 are now correctly deleted.
8645 * The `unreachable_code` lint [warns when a function call's argument
8647 * The parser indicates [failures that may be caused by
8648 confusingly-similar Unicode characters][1.6uc]
8649 * Certain macro errors [are reported at definition time][1.6m], not
8655 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8656 environment variable when locating crates. This was a pre-cargo
8657 feature for integrating with the package manager that was
8658 accidentally never removed.
8659 * [A number of bugs were fixed in the privacy checker][1.6p] that
8660 could cause previously-accepted code to break.
8661 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8662 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8663 struct pattern syntax (`Foo(..)`) can no longer be used to match
8664 unit structs. This is a warning now, but will become an error in
8665 future releases. Patterns that share the same name as a const are
8667 * A bug was fixed that causes [rustc not to apply default type
8668 parameters][1.6xc] when resolving certain method implementations of
8669 traits defined in other crates.
8671 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8672 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8673 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8674 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8675 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8676 [1.6co]: http://doc.rust-lang.org/core/index.html
8677 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8678 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8679 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8680 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8681 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8682 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8683 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8684 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8685 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8686 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8687 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8688 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8689 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8690 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8691 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8692 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8693 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8694 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8695 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8696 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8697 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8698 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8699 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8700 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8701 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8702 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8703 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8704 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8705 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8706 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8707 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8708 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8709 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8710 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8711 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8712 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8713 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8714 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8715 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8716 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8717 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8720 Version 1.5.0 (2015-12-10)
8721 ==========================
8723 * ~700 changes, numerous bugfixes
8729 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8730 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8731 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8732 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8733 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8734 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8735 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8736 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8737 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8738 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8739 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8740 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8741 [`Path::read_link`], [`Path::symlink_metadata`],
8742 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8743 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8744 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8745 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8746 [`slice::split_first_mut`], [`slice::split_first`],
8747 [`slice::split_last_mut`], [`slice::split_last`],
8748 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8749 [`str::MatchIndices`], [`str::RMatchIndices`],
8750 [`str::match_indices`], [`str::rmatch_indices`],
8751 [`str::slice_mut_unchecked`], [`string::ParseError`].
8752 * Rust applications hosted on crates.io can be installed locally to
8753 `~/.cargo/bin` with the [`cargo install`] command. Among other
8754 things this makes it easier to augment Cargo with new subcommands:
8755 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8756 invoked as `cargo foo`.
8757 * Crates with wildcard (`*`) dependencies will [emit warnings when
8758 published][1.5w]. In 1.6 it will no longer be possible to publish
8759 crates with wildcard dependencies.
8764 * The rules determining when a particular lifetime must outlive
8765 a particular value (known as '[dropck]') have been [modified
8766 to not rely on parametricity][1.5p].
8767 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8768 and `Arc`][1.5a]. Because these smart pointer types implement
8769 `Deref`, this causes breakage in cases where the interior type
8770 contains methods of the same name.
8771 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8772 that they could drop their content. Soundness fix.
8773 * All method invocations are [properly checked][1.5wf1] for
8774 [well-formedness][1.5wf2]. Soundness fix.
8775 * Traits whose supertraits contain `Self` are [not object
8776 safe][1.5o]. Soundness fix.
8777 * Target specifications support a [`no_default_libraries`][1.5nd]
8778 setting that controls whether `-nodefaultlibs` is passed to the
8779 linker, and in turn the `is_like_windows` setting no longer affects
8780 the `-nodefaultlibs` flag.
8781 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8782 * The `#[inline]` and `#[repr]` attributes [can only appear
8783 in valid locations][1.5at].
8784 * Native libraries linked from the local crate are [passed to
8785 the linker before native libraries from upstream crates][1.5nl].
8786 * Two rarely-used attributes, `#[no_debug]` and
8787 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8788 * Negation of unsigned integers, which has been a warning for
8789 several releases, [is now behind a feature gate and will
8790 generate errors][1.5nu].
8791 * The parser accidentally accepted visibility modifiers on
8792 enum variants, a bug [which has been fixed][1.5ev].
8793 * [A bug was fixed that allowed `use` statements to import unstable
8799 * When evaluating expressions at compile-time that are not
8800 compile-time constants (const-evaluating expressions in non-const
8801 contexts), incorrect code such as overlong bitshifts and arithmetic
8802 overflow will [generate a warning instead of an error][1.5ce],
8803 delaying the error until runtime. This will allow the
8804 const-evaluator to be expanded in the future backwards-compatibly.
8805 * The `improper_ctypes` lint [no longer warns about using `isize` and
8806 `usize` in FFI][1.5ict].
8811 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8813 * `Default` is [implemented for mutable slices][1.5d].
8814 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8815 * There are now `From` conversions [between floating point
8816 types][1.5f] where the conversions are lossless.
8817 * There are now `From` conversions [between integer types][1.5i] where
8818 the conversions are lossless.
8819 * [`fs::Metadata` implements `Clone`][1.5fs].
8820 * The `parse` method [accepts a leading "+" when parsing
8822 * [`AsMut` is implemented for `Vec`][1.5am].
8823 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8824 been optimized][1.5cf] and no longer rely on the default impl.
8825 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8826 `unsafe extern "C"` function types now [implement `Clone`,
8827 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8828 `fmt::Debug` for up to 12 arguments][1.5fp].
8829 * [Dropping `Vec`s is much faster in unoptimized builds when the
8830 element types don't implement `Drop`][1.5dv].
8831 * A bug that caused in incorrect behavior when [combining `VecDeque`
8832 with zero-sized types][1.5vdz] was resolved.
8833 * [`PartialOrd` for slices is faster][1.5po].
8838 * [Crate metadata size was reduced by 20%][1.5md].
8839 * [Improvements to code generation reduced the size of libcore by 3.3
8840 MB and rustc's memory usage by 18MB][1.5m].
8841 * [Improvements to deref translation increased performance in
8842 unoptimized builds][1.5dr].
8843 * Various errors in trait resolution [are deduplicated to only be
8844 reported once][1.5te].
8845 * Rust has preliminary [support for rumprun kernels][1.5rr].
8846 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8848 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8849 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8850 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8851 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8852 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8853 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8854 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8855 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8856 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8857 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8858 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8859 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8860 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8861 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8862 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8863 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8864 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8865 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8866 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8867 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8868 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8869 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8870 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8871 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8872 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8873 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8874 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8875 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8876 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8877 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8878 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8879 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8880 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8881 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8882 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8883 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8884 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8885 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8886 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8887 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8888 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8889 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8890 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8891 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8892 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8893 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8894 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8895 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8896 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8897 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8898 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8899 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8900 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8901 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8902 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8903 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8904 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8905 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8906 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8907 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8908 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8909 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8910 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8911 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8912 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8913 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8914 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8915 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8916 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8917 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8918 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8919 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8920 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8921 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8922 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8923 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8924 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8925 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8926 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8927 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8928 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8929 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8930 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8931 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8932 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8933 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8934 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8935 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8936 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8938 Version 1.4.0 (2015-10-29)
8939 ==========================
8941 * ~1200 changes, numerous bugfixes
8946 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8947 GNU) are now supported and recommended for use.
8952 * [Several changes have been made to fix type soundness and improve
8953 the behavior of associated types][sound]. See [RFC 1214]. Although
8954 we have mostly introduced these changes as warnings this release, to
8955 become errors next release, there are still some scenarios that will
8956 see immediate breakage.
8957 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8958 line breaks in addition to `\n`][crlf].
8959 * [Loans of `'static` lifetime extend to the end of a function][stat].
8960 * [`str::parse` no longer introduces avoidable rounding error when
8961 parsing floating point numbers. Together with earlier changes to
8962 float formatting/output, "round trips" like f.to_string().parse()
8963 now preserve the value of f exactly. Additionally, leading plus
8964 signs are now accepted][fp3].
8970 * `use` statements that import multiple items [can now rename
8971 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8972 * [Binops work correctly on fat pointers][binfat].
8973 * `pub extern crate`, which does not behave as expected, [issues a
8974 warning][pec] until a better solution is found.
8979 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8980 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8981 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8982 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8983 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8984 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8985 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8986 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8987 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8988 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8989 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8990 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8991 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8992 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8993 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8994 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8995 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8996 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8998 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8999 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9000 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9001 `f64::from_str_radix`.
9002 * [Reverse-searching strings is faster with the 'two-way'
9004 * [`std::io::copy` allows `?Sized` arguments][cc].
9005 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9006 [override `count`, `nth` and `last` with an *O*(1)
9007 implementation][it].
9008 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9009 * [`IntoRawFd` has been added to the Unix-specific prelude,
9010 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9012 * [`Extend<String>` and `FromIterator<String` are both implemented for
9014 * [`IntoIterator` is implemented for references to `Option` and
9016 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9017 Copy`][ext] as part of [RFC 839]. This will cause type inference
9018 breakage in rare situations.
9019 * [`BinaryHeap` implements `Debug`][bh2].
9020 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9022 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9023 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9024 * [String comparison is faster][faststr].
9025 * `&mut T` where `T: std::fmt::Write` [also implements
9026 `std::fmt::Write`][mutw].
9027 * [A stable regression in `VecDeque::push_back` and other
9028 capacity-altering methods that caused panics for zero-sized types
9030 * [Function pointers implement traits for up to 12 parameters][fp2].
9035 * The compiler [no longer uses the 'morestack' feature to prevent
9036 stack overflow][mm]. Instead it uses guard pages and stack
9037 probes (though stack probes are not yet implemented on any platform
9039 * [The compiler matches traits faster when projections are involved][p].
9040 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9042 * [Cargo now displays useful information about what its doing during
9043 `cargo update`][cu].
9045 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9046 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9047 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9048 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9049 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9050 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9051 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9052 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9053 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9054 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9055 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9056 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9057 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9058 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9059 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9060 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9061 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9062 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9063 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9064 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9065 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9066 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9067 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9068 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9069 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9070 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9071 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9072 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9073 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9074 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9075 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9076 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9077 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9078 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9079 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9080 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9081 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9082 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9083 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9084 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9085 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9086 [bh2]: https://github.com/rust-lang/rust/pull/28156
9087 [binfat]: https://github.com/rust-lang/rust/pull/28270
9088 [bm]: https://github.com/rust-lang/rust/pull/28197
9089 [cc]: https://github.com/rust-lang/rust/pull/27531
9090 [crlf]: https://github.com/rust-lang/rust/pull/28034
9091 [cu]: https://github.com/rust-lang/cargo/pull/1931
9092 [d]: https://github.com/rust-lang/rust/pull/27825
9093 [dep]: https://github.com/rust-lang/rust/pull/28339
9094 [es]: https://github.com/rust-lang/rust/pull/27956
9095 [ext]: https://github.com/rust-lang/rust/pull/28094
9096 [faststr]: https://github.com/rust-lang/rust/pull/28338
9097 [ffi]: https://github.com/rust-lang/rust/pull/28779
9098 [fp]: https://github.com/rust-lang/rust/pull/28268
9099 [fp2]: https://github.com/rust-lang/rust/pull/28560
9100 [fp3]: https://github.com/rust-lang/rust/pull/27307
9101 [i]: https://github.com/rust-lang/rust/pull/27451
9102 [into2]: https://github.com/rust-lang/rust/pull/28039
9103 [it]: https://github.com/rust-lang/rust/pull/27652
9104 [mm]: https://github.com/rust-lang/rust/pull/27338
9105 [mutw]: https://github.com/rust-lang/rust/pull/28368
9106 [sound]: https://github.com/rust-lang/rust/pull/27641
9107 [p]: https://github.com/rust-lang/rust/pull/27866
9108 [pec]: https://github.com/rust-lang/rust/pull/28486
9109 [pr]: https://github.com/rust-lang/rust/pull/27896
9110 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9111 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9112 [s]: https://github.com/rust-lang/rust/pull/27474
9113 [stab]: https://github.com/rust-lang/rust/pull/28339
9114 [stat]: https://github.com/rust-lang/rust/pull/28321
9115 [vd]: https://github.com/rust-lang/rust/pull/28494
9117 Version 1.3.0 (2015-09-17)
9118 ==============================
9120 * ~900 changes, numerous bugfixes
9125 * The [new object lifetime defaults][nold] have been [turned
9126 on][nold2] after a cycle of warnings about the change. Now types
9127 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9128 being interpreted as `&'a Box<Trait+'a>` to `&'a
9129 Box<Trait+'static>`.
9130 * [The Rustonomicon][nom] is a new book in the official documentation
9131 that dives into writing unsafe Rust.
9132 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9133 timekeeping is employed by other std APIs, as well as out-of-tree
9139 * The [new object lifetime defaults][nold] have been [turned
9140 on][nold2] after a cycle of warnings about the change.
9141 * There is a known [regression][lr] in how object lifetime elision is
9142 interpreted, the proper solution for which is undetermined.
9143 * The `#[prelude_import]` attribute, an internal implementation
9144 detail, was accidentally stabilized previously. [It has been put
9145 behind the `prelude_import` feature gate][pi]. This change is
9146 believed to break no existing code.
9147 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9148 [more sane for dynamically sized types][dst3]. Code that relied on
9149 the previous behavior is thought to be broken.
9150 * The `dropck` rules, which checks that destructors can't access
9151 destroyed values, [have been updated][dropck] to match the
9152 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9153 cause some previously-compiling code to no longer build.
9158 * The [new object lifetime defaults][nold] have been [turned
9159 on][nold2] after a cycle of warnings about the change.
9160 * Semicolons may [now follow types and paths in
9161 macros](https://github.com/rust-lang/rust/pull/27000).
9162 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9163 [more sane for dynamically sized types][dst3]. Code that relied on
9164 the previous behavior is not known to exist, and suspected to be
9166 * `'static` variables [may now be recursive][st].
9167 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9168 implementations correctly.
9169 * The `dropck` rules, which checks that destructors can't access
9170 destroyed values, [have been updated][dropck] to match the
9176 * The [`Duration`] API, [has been stabilized][ds], as well as the
9177 `std::time` module, which presently contains only `Duration`.
9178 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9179 * The owned C string, [`CString`], implements [`Borrow`] and the
9180 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9181 these allow C strings to be borrowed and cloned in generic code.
9182 * [`CStr`] implements [`Debug`].
9183 * [`AtomicPtr`] implements [`Debug`].
9184 * [`Error`] trait objects [can be downcast to their concrete types][e]
9185 in many common configurations, using the [`is`], [`downcast`],
9186 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9188 * Searching for substrings now [employs the two-way algorithm][search]
9189 instead of doing a naive search. This gives major speedups to a
9190 number of methods, including [`contains`][sc], [`find`][sf],
9191 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9192 [`ends_with`][sew] are also faster.
9193 * The performance of `PartialEq` for slices is [much faster][ps].
9194 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9195 is overridden and optimized by the implementations for scalars.
9196 * The [`Hasher`] trait now has a number of specialized `write_*`
9197 methods for primitive types, for efficiency.
9198 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9199 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9200 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9201 of [`std::error::Error::cause`][iec] also delegates to the inner
9203 * [`process::Child`][pc] gained the [`id`] method, which returns a
9204 `u32` representing the platform-specific process identifier.
9205 * The [`connect`] method on slices is deprecated, replaced by the new
9206 [`join`] method (note that both of these are on the *unstable*
9207 [`SliceConcatExt`] trait, but through the magic of the prelude are
9208 available to stable code anyway).
9209 * The [`Div`] operator is implemented for [`Wrapping`] types.
9210 * [`DerefMut` is implemented for `String`][dms].
9211 * Performance of SipHash (the default hasher for `HashMap`) is
9212 [better for long data][sh].
9213 * [`AtomicPtr`] implements [`Send`].
9214 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9215 are now [specialized to use uninitialized buffers for increased
9217 * Lifetime parameters of foreign functions [are now resolved
9223 * Rust can now, with some coercion, [produce programs that run on
9224 Windows XP][xp], though XP is not considered a supported platform.
9225 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9226 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9227 recommended for use in 1.3, though should be fully-functional
9228 in the [64-bit 1.4 beta][b14].
9229 * On Fedora-based systems installation will [properly configure the
9230 dynamic linker][fl].
9231 * The compiler gained many new extended error descriptions, which can
9232 be accessed with the `--explain` flag.
9233 * The `dropck` pass, which checks that destructors can't access
9234 destroyed values, [has been rewritten][27261]. This fixes some
9235 soundness holes, and as such will cause some previously-compiling
9236 code to no longer build.
9237 * `rustc` now uses [LLVM to write archive files where possible][ar].
9238 Eventually this will eliminate the compiler's dependency on the ar
9240 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9241 supported FreeBSD on x86_64).
9242 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9243 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9245 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9246 will kill the process instead of leaking][nlp].
9248 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9249 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9250 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9251 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9252 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9253 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9254 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9255 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9256 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9257 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9258 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9259 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9260 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9261 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9262 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9263 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9264 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9265 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9266 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9267 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9268 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9269 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9270 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9271 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9272 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9273 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9274 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9275 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9276 [ar]: https://github.com/rust-lang/rust/pull/26926
9277 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9278 [dms]: https://github.com/rust-lang/rust/pull/26241
9279 [27261]: https://github.com/rust-lang/rust/pull/27261
9280 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9281 [ds]: https://github.com/rust-lang/rust/pull/26818
9282 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9283 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9284 [dst3]: https://github.com/rust-lang/rust/pull/27351
9285 [e]: https://github.com/rust-lang/rust/pull/24793
9286 [f]: https://github.com/rust-lang/rust/pull/26588
9287 [26959]: https://github.com/rust-lang/rust/pull/26959
9288 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9289 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9290 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9291 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9292 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9293 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9294 [lic]: https://github.com/rust-lang/rust/pull/26583
9295 [lnu]: https://github.com/rust-lang/rust/pull/27026
9296 [lr]: https://github.com/rust-lang/rust/issues/27248
9297 [lum]: https://github.com/rust-lang/rust/pull/26378
9298 [lur]: https://github.com/rust-lang/rust/pull/26783
9299 [nlp]: https://github.com/rust-lang/rust/pull/27176
9300 [nold2]: https://github.com/rust-lang/rust/pull/27045
9301 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9302 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9303 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9304 [pi]: https://github.com/rust-lang/rust/pull/26699
9305 [ps]: https://github.com/rust-lang/rust/pull/26884
9306 [rte]: https://github.com/rust-lang/rust/pull/26950
9307 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9308 [search]: https://github.com/rust-lang/rust/pull/26327
9309 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9310 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9311 [sh]: https://github.com/rust-lang/rust/pull/27280
9312 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9313 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9314 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9315 [st]: https://github.com/rust-lang/rust/pull/26630
9316 [win1]: https://github.com/rust-lang/rust/pull/26569
9317 [win2]: https://github.com/rust-lang/rust/pull/26741
9318 [win3]: https://github.com/rust-lang/rust/pull/26741
9319 [win4]: https://github.com/rust-lang/rust/pull/27210
9320 [xp]: https://github.com/rust-lang/rust/pull/26569
9322 Version 1.2.0 (2015-08-07)
9323 ==========================
9325 * ~1200 changes, numerous bugfixes
9330 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9331 like `Rc` to contain types without a fixed size, arrays and trait
9332 objects, finally enabling use of `Rc<[T]>` and completing the
9333 implementation of DST.
9334 * [Parallel codegen][parcodegen] is now working again, which can
9335 substantially speed up large builds in debug mode; It also gets
9336 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9337 jobs). It's not enabled by default, but will be "in the near
9338 future". It can be activated with the `-C codegen-units=N` flag to
9340 * This is the first release with [experimental support for linking
9341 with the MSVC linker and lib C on Windows (instead of using the GNU
9342 variants via MinGW)][win]. It is yet recommended only for the most
9343 intrepid Rustaceans.
9344 * Benchmark compilations are showing a 30% improvement in
9345 bootstrapping over 1.1.
9350 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9351 unicode case mapping, which is a previously-planned change in
9352 behavior and considered a bugfix.
9353 * [`mem::align_of`] now specifies [the *minimum alignment* for
9354 T][align], which is usually the alignment programs are interested
9355 in, and the same value reported by clang's
9356 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9358 * [The `#[packed]` attribute is no longer silently accepted by the
9359 compiler][packed]. This attribute did nothing and code that
9360 mentioned it likely did not work as intended.
9361 * Associated type defaults are [now behind the
9362 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9363 defaults *did not work*, but could be mentioned syntactically. As
9364 such this breakage has minimal impact.
9369 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9370 matching against dereferenceable values.
9375 * The [`Extend`] trait, which grows a collection from an iterator, is
9376 implemented over iterators of references, for `String`, `Vec`,
9377 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9378 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9379 * The [`iter::once`] function returns an iterator that yields a single
9380 element, and [`iter::empty`] returns an iterator that yields no
9382 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9383 over substring matches.
9384 * [`Cell`] and [`RefCell`] both implement `Eq`.
9385 * A number of methods for wrapping arithmetic are added to the
9386 integral types, [`wrapping_div`], [`wrapping_rem`],
9387 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9388 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9389 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9390 type.. It is illegal for the default arithmetic operations in Rust
9391 to overflow; the desire to wrap must be explicit.
9392 * The `{:#?}` formatting specifier [displays the alternate,
9393 pretty-printed][debugfmt] form of the `Debug` formatter. This
9394 feature was actually introduced prior to 1.0 with little
9396 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9397 for writing data to formatted strings, similar to [`io::Write`].
9398 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9399 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9400 are used by code generators to emit implementations of [`Debug`].
9401 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9402 methods that convert case, following Unicode case mapping.
9403 * It is now easier to handle poisoned locks. The [`PoisonError`]
9404 type, returned by failing lock operations, exposes `into_inner`,
9405 `get_ref`, and `get_mut`, which all give access to the inner lock
9406 guard, and allow the poisoned lock to continue to operate. The
9407 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9408 poisoned lock without attempting to take the lock.
9409 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9410 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9411 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9412 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9414 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9420 * `rustc` employs smarter heuristics for guessing at [typos].
9421 * `rustc` emits more efficient code for [no-op conversions between
9422 unsafe pointers][nop].
9423 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9424 resulting in faster compile times and smaller code.
9426 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9427 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9428 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9429 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9430 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9431 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9432 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9433 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9434 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9435 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9436 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9437 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9438 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9439 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9440 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9441 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9442 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9443 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9444 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9445 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9446 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9447 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9448 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9449 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9450 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9451 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9452 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9453 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9454 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9455 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9456 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9457 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9458 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9459 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9460 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9461 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9462 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9463 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9464 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9465 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9466 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9467 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9468 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9469 [align]: https://github.com/rust-lang/rust/pull/25646
9470 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9471 [typos]: https://github.com/rust-lang/rust/pull/26087
9472 [nop]: https://github.com/rust-lang/rust/pull/26336
9473 [fat]: https://github.com/rust-lang/rust/pull/26411
9474 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9475 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9476 [packed]: https://github.com/rust-lang/rust/pull/25541
9477 [ad]: https://github.com/rust-lang/rust/pull/27382
9478 [win]: https://github.com/rust-lang/rust/pull/25350
9480 Version 1.1.0 (2015-06-25)
9481 =========================
9483 * ~850 changes, numerous bugfixes
9488 * The [`std::fs` module has been expanded][fs] to expand the set of
9489 functionality exposed:
9490 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9491 don't incur a syscall on some platforms.
9492 * A `symlink_metadata` function has been added.
9493 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9494 access to all underlying information.
9495 * The compiler now contains extended explanations of many errors. When an error
9496 with an explanation occurs the compiler suggests using the `--explain` flag
9497 to read the explanation. Error explanations are also [available online][err-index].
9498 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9499 well as other work, the time to bootstrap the compiler decreased by
9505 * The [`str::split_whitespace`] method splits a string on unicode
9506 whitespace boundaries.
9507 * On both Windows and Unix, new extension traits provide conversion of
9508 I/O types to and from the underlying system handles. On Unix, these
9509 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9510 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9511 `TcpListener`, and `UpdSocket`. Further implementations for
9512 `std::process` will be stabilized later.
9513 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9514 Windows, symlinks can be created with
9515 `std::os::windows::symlink_dir` and
9516 `std::os::windows::symlink_file`.
9517 * The `mpsc::Receiver` type can now be converted into an iterator with
9518 `into_iter` on the [`IntoIterator`] trait.
9519 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9520 implementation of the [`From`] trait.
9521 * The `Debug` implementation for `RangeFull` [creates output that is
9522 more consistent with other implementations][rf].
9523 * [`Debug` is implemented for `File`][file].
9524 * The `Default` implementation for `Arc` [no longer requires `Sync +
9526 * [The `Iterator` methods `count`, `nth`, and `last` have been
9527 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9528 * Incorrect handling of paths on Windows has been improved in both the
9529 compiler and the standard library.
9530 * [`AtomicPtr` gained a `Default` implementation][ap].
9531 * In accordance with Rust's policy on arithmetic overflow `abs` now
9532 [panics on overflow when debug assertions are enabled][abs].
9533 * The [`Cloned`] iterator, which was accidentally left unstable for
9534 1.0 [has been stabilized][c].
9535 * The [`Incoming`] iterator, which iterates over incoming TCP
9536 connections, and which was accidentally unnamable in 1.0, [is now
9537 properly exported][inc].
9538 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9539 `sift_up` or `sift_down` panic][bh].
9540 * The [`split_off`] method of `LinkedList` [no longer corrupts
9541 the list in certain scenarios][ll].
9546 * Type checking performance [has improved notably][sk] with
9547 [multiple improvements][pre].
9548 * The compiler [suggests code changes][ch] for more errors.
9549 * rustc and it's build system have experimental support for [building
9550 toolchains against MUSL][m] instead of glibc on Linux.
9551 * The compiler defines the `target_env` cfg value, which is used for
9552 distinguishing toolchains that are otherwise for the same
9553 platform. Presently this is set to `gnu` for common GNU Linux
9554 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9555 * The [`cargo rustc`][crc] command invokes a build with custom flags
9557 * [Android executables are always position independent][pie].
9558 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9559 with `Drop`][24935].
9561 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9562 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9563 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9564 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9565 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9566 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9567 [rf]: https://github.com/rust-lang/rust/pull/24491
9568 [err-index]: https://doc.rust-lang.org/error-index.html
9569 [sk]: https://github.com/rust-lang/rust/pull/24615
9570 [pre]: https://github.com/rust-lang/rust/pull/25323
9571 [file]: https://github.com/rust-lang/rust/pull/24598
9572 [ch]: https://github.com/rust-lang/rust/pull/24683
9573 [arc]: https://github.com/rust-lang/rust/pull/24695
9574 [si]: https://github.com/rust-lang/rust/pull/24701
9575 [ap]: https://github.com/rust-lang/rust/pull/24834
9576 [m]: https://github.com/rust-lang/rust/pull/24777
9577 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9578 [crc]: https://github.com/rust-lang/cargo/pull/1568
9579 [pie]: https://github.com/rust-lang/rust/pull/24953
9580 [abs]: https://github.com/rust-lang/rust/pull/25441
9581 [c]: https://github.com/rust-lang/rust/pull/25496
9582 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9583 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9584 [inc]: https://github.com/rust-lang/rust/pull/25522
9585 [bh]: https://github.com/rust-lang/rust/pull/25856
9586 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9587 [ll]: https://github.com/rust-lang/rust/pull/26022
9588 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9589 [24935]: https://github.com/rust-lang/rust/pull/24935
9591 Version 1.0.0 (2015-05-15)
9592 ========================
9594 * ~1500 changes, numerous bugfixes
9599 * The vast majority of the standard library is now `#[stable]`. It is
9600 no longer possible to use unstable features with a stable build of
9602 * Many popular crates on [crates.io] now work on the stable release
9604 * Arithmetic on basic integer types now [checks for overflow in debug
9610 * Several [restrictions have been added to trait coherence][coh] in
9611 order to make it easier for upstream authors to change traits
9612 without breaking downstream code.
9613 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9614 improve error messages and macro behavior. For example, `0b1234` is
9615 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9616 * Trait bounds [are always invariant][inv], eliminating the need for
9617 the `PhantomFn` and `MarkerTrait` lang items, which have been
9619 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9620 "foo" as bar` syntax has been replaced with `extern crate foo as
9621 bar`, and Cargo now automatically translates "-" in *package* names
9622 to underscore for the crate name.
9623 * [Lifetime shadowing is an error][lt].
9624 * [`Send` no longer implies `'static`][send-rfc].
9625 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9626 `MyType::default()`.
9627 * Primitive types [now have inherent methods][prim-inherent],
9628 obviating the need for extension traits like `SliceExt`.
9629 * Methods with `Self: Sized` in their `where` clause are [considered
9630 object-safe][self-sized], allowing many extension traits like
9631 `IteratorExt` to be merged into the traits they extended.
9632 * You can now [refer to associated types][assoc-where] whose
9633 corresponding trait bounds appear only in a `where` clause.
9634 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9635 like `Send` and `Sync` are now library-defined.
9636 * A [Reflect trait][reflect] was introduced, which means that
9637 downcasting via the `Any` trait is effectively limited to concrete
9638 types. This helps retain the potentially-important "parametricity"
9639 property: generic code cannot behave differently for different type
9640 arguments except in minor ways.
9641 * The `unsafe_destructor` feature is now deprecated in favor of the
9642 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9648 * The `thread_local` module [has been renamed to `std::thread`][th].
9649 * The methods of `IteratorExt` [have been moved to the `Iterator`
9650 trait itself][23300].
9651 * Several traits that implement Rust's conventions for type
9652 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9653 [centralized in the `std::convert` module][con].
9654 * The `FromError` trait [was removed in favor of `From`][fe].
9655 * The basic sleep function [has moved to
9656 `std::thread::sleep_ms`][slp].
9657 * The `splitn` function now takes an `n` parameter that represents the
9658 number of items yielded by the returned iterator [instead of the
9659 number of 'splits'][spl].
9660 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9661 * [Derived implementations of `PartialOrd` now order enums according
9662 to their explicitly-assigned discriminants][po].
9663 * [Methods for searching strings are generic over `Pattern`s][pat],
9664 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9666 * [In method resolution, object methods are resolved before inherent
9668 * [`String::from_str` has been deprecated in favor of the `From` impl,
9669 `String::from`][24517].
9670 * [`io::Error` implements `Sync`][ios].
9671 * [The `words` method on `&str` has been replaced with
9672 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9674 * The new path and IO modules are complete and `#[stable]`. This
9675 was the major library focus for this cycle.
9676 * The path API was [revised][path-normalize] to normalize `.`,
9677 adjusting the tradeoffs in favor of the most common usage.
9678 * A large number of remaining APIs in `std` were also stabilized
9679 during this cycle; about 75% of the non-deprecated API surface
9681 * The new [string pattern API][string-pattern] landed, which makes
9682 the string slice API much more internally consistent and flexible.
9683 * A new set of [generic conversion traits][conversion] replaced
9684 many existing ad hoc traits.
9685 * Generic numeric traits were [completely removed][num-traits]. This
9686 was made possible thanks to inherent methods for primitive types,
9687 and the removal gives maximal flexibility for designing a numeric
9688 hierarchy in the future.
9689 * The `Fn` traits are now related via [inheritance][fn-inherit]
9690 and provide ergonomic [blanket implementations][fn-blanket].
9691 * The `Index` and `IndexMut` traits were changed to
9692 [take the index by value][index-value], enabling code like
9693 `hash_map["string"]` to work.
9694 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9695 `Copy` data is known to be `Clone` as well.
9700 * Many errors now have extended explanations that can be accessed with
9701 the `--explain` flag to `rustc`.
9702 * Many new examples have been added to the standard library
9704 * rustdoc has received a number of improvements focused on completion
9706 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9707 * Much headway was made on ecosystem-wide CI, making it possible
9708 to [compare builds for breakage][ci-compare].
9711 [crates.io]: http://crates.io
9712 [clo]: https://github.com/rust-lang/rust/pull/24034
9713 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9714 [con]: https://github.com/rust-lang/rust/pull/23875
9715 [cr]: https://github.com/rust-lang/rust/pull/23419
9716 [fe]: https://github.com/rust-lang/rust/pull/23879
9717 [23300]: https://github.com/rust-lang/rust/pull/23300
9718 [inv]: https://github.com/rust-lang/rust/pull/23938
9719 [ios]: https://github.com/rust-lang/rust/pull/24133
9720 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9721 [lt]: https://github.com/rust-lang/rust/pull/24057
9722 [meth]: https://github.com/rust-lang/rust/pull/24056
9723 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9724 [po]: https://github.com/rust-lang/rust/pull/24270
9725 [24517]: https://github.com/rust-lang/rust/pull/24517
9726 [slp]: https://github.com/rust-lang/rust/pull/23949
9727 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9728 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9729 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9730 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9731 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9732 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9733 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9734 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9735 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9736 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9737 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9738 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9739 [reflect]: https://github.com/rust-lang/rust/pull/23712
9740 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9741 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9742 [index-value]: https://github.com/rust-lang/rust/pull/23601
9743 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9744 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9745 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9746 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9747 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9748 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9751 Version 1.0.0-alpha.2 (2015-02-20)
9752 =====================================
9754 * ~1300 changes, numerous bugfixes
9758 * The various I/O modules were [overhauled][io-rfc] to reduce
9759 unnecessary abstractions and provide better interoperation with
9760 the underlying platform. The old `io` module remains temporarily
9762 * The standard library now [participates in feature gating][feat],
9763 so use of unstable libraries now requires a `#![feature(...)]`
9764 attribute. The impact of this change is [described on the
9765 forum][feat-forum]. [RFC][feat-rfc].
9769 * `for` loops [now operate on the `IntoIterator` trait][into],
9770 which eliminates the need to call `.iter()`, etc. to iterate
9771 over collections. There are some new subtleties to remember
9772 though regarding what sort of iterators various types yield, in
9773 particular that `for foo in bar { }` yields values from a move
9774 iterator, destroying the original collection. [RFC][into-rfc].
9775 * Objects now have [default lifetime bounds][obj], so you don't
9776 have to write `Box<Trait+'static>` when you don't care about
9777 storing references. [RFC][obj-rfc].
9778 * In types that implement `Drop`, [lifetimes must outlive the
9779 value][drop]. This will soon make it possible to safely
9780 implement `Drop` for types where `#[unsafe_destructor]` is now
9781 required. Read the [gorgeous RFC][drop-rfc] for details.
9782 * The fully qualified <T as Trait>::X syntax lets you set the Self
9783 type for a trait method or associated type. [RFC][ufcs-rfc].
9784 * References to types that implement `Deref<U>` now [automatically
9785 coerce to references][deref] to the dereferenced type `U`,
9786 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9787 should eliminate many unsightly uses of `&*`, as when converting
9788 from references to vectors into references to
9789 slices. [RFC][deref-rfc].
9790 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9791 `|:|`) is obsolete and closure kind is inferred from context.
9792 * [`Self` is a keyword][Self].
9796 * The `Show` and `String` formatting traits [have been
9797 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9798 their related purposes. Automatically getting a string
9799 conversion to use with `format!("{:?}", something_to_debug)` is
9800 now written `#[derive(Debug)]`.
9801 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9802 OsStr}`, provide strings in platform-specific encodings for easier
9803 interop with system APIs. [RFC][osstr-rfc].
9804 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9805 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9806 creating raw pointers.
9810 * Certain long error messages of the form 'expected foo found bar'
9811 are now [split neatly across multiple
9812 lines][multiline]. Examples in the PR.
9813 * On Unix Rust can be [uninstalled][un] by running
9814 `/usr/local/lib/rustlib/uninstall.sh`.
9815 * The `#[rustc_on_unimplemented]` attribute, requiring the
9816 'on_unimplemented' feature, lets rustc [display custom error
9817 messages when a trait is expected to be implemented for a type
9822 * Rust is tested against a [LALR grammar][lalr], which parses
9823 almost all the Rust files that rustc does.
9825 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9826 [close]: https://github.com/rust-lang/rust/pull/21843
9827 [deref]: https://github.com/rust-lang/rust/pull/21351
9828 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9829 [drop]: https://github.com/rust-lang/rust/pull/21972
9830 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9831 [feat]: https://github.com/rust-lang/rust/pull/21248
9832 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9833 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9834 [fmt]: https://github.com/rust-lang/rust/pull/21457
9835 [into]: https://github.com/rust-lang/rust/pull/20790
9836 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9837 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9838 [lalr]: https://github.com/rust-lang/rust/pull/21452
9839 [multiline]: https://github.com/rust-lang/rust/pull/19870
9840 [obj]: https://github.com/rust-lang/rust/pull/22230
9841 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9842 [onun]: https://github.com/rust-lang/rust/pull/20889
9843 [osstr]: https://github.com/rust-lang/rust/pull/21488
9844 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9845 [Self]: https://github.com/rust-lang/rust/pull/22158
9846 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9847 [un]: https://github.com/rust-lang/rust/pull/22256
9850 Version 1.0.0-alpha (2015-01-09)
9851 ==================================
9853 * ~2400 changes, numerous bugfixes
9857 * The language itself is considered feature complete for 1.0,
9858 though there will be many usability improvements and bugfixes
9859 before the final release.
9860 * Nearly 50% of the public API surface of the standard library has
9861 been declared 'stable'. Those interfaces are unlikely to change
9863 * The long-running debate over integer types has been
9864 [settled][ints]: Rust will ship with types named `isize` and
9865 `usize`, rather than `int` and `uint`, for pointer-sized
9866 integers. Guidelines will be rolled out during the alpha cycle.
9867 * Most crates that are not `std` have been moved out of the Rust
9868 distribution into the Cargo ecosystem so they can evolve
9869 separately and don't need to be stabilized as quickly, including
9870 'time', 'getopts', 'num', 'regex', and 'term'.
9871 * Documentation continues to be expanded with more API coverage, more
9872 examples, and more in-depth explanations. The guides have been
9873 consolidated into [The Rust Programming Language][trpl].
9874 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9875 * All official Rust binary installers now come with [Cargo], the
9876 Rust package manager.
9880 * Closures have been [completely redesigned][unboxed] to be
9881 implemented in terms of traits, can now be used as generic type
9882 bounds and thus monomorphized and inlined, or via an opaque
9883 pointer (boxed) as in the old system. The new system is often
9884 referred to as 'unboxed' closures.
9885 * Traits now support [associated types][assoc], allowing families
9886 of related types to be defined together and used generically in
9888 * Enum variants are [namespaced by their type names][enum].
9889 * [`where` clauses][where] provide a more versatile and attractive
9890 syntax for specifying generic bounds, though the previous syntax
9892 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9894 * Rust [no longer has a runtime][rt] of any description, and only
9895 supports OS threads, not green threads.
9896 * At long last, Rust has been overhauled for 'dynamically-sized
9897 types' ([DST]), which integrates 'fat pointers' (object types,
9898 arrays, and `str`) more deeply into the type system, making it
9900 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9901 `..j` that produce range types and which, when combined with the
9902 `Index` operator and multidispatch, leads to a convenient slice
9904 * The new range syntax revealed an ambiguity in the fixed-length
9905 array syntax, so now fixed length arrays [are written `[T;
9907 * The `Copy` trait is no longer implemented automatically. Unsafe
9908 pointers no longer implement `Sync` and `Send` so types
9909 containing them don't automatically either. `Sync` and `Send`
9910 are now 'unsafe traits' so one can "forcibly" implement them via
9911 `unsafe impl` if a type confirms to the requirements for them
9912 even though the internals do not (e.g. structs containing unsafe
9913 pointers like `Arc`). These changes are intended to prevent some
9914 footguns and are collectively known as [opt-in built-in
9915 traits][oibit] (though `Sync` and `Send` will soon become pure
9916 library types unknown to the compiler).
9917 * Operator traits now take their operands [by value][ops], and
9918 comparison traits can use multidispatch to compare one type
9919 against multiple other types, allowing e.g. `String` to be
9920 compared with `&str`.
9921 * `if let` and `while let` are no longer feature-gated.
9922 * Rust has adopted a more [uniform syntax for escaping unicode
9923 characters][unicode].
9924 * `macro_rules!` [has been declared stable][mac]. Though it is a
9925 flawed system it is sufficiently popular that it must be usable
9926 for 1.0. Effort has gone into [future-proofing][mac-future] it
9927 in ways that will allow other macro systems to be developed in
9928 parallel, and won't otherwise impact the evolution of the
9930 * The prelude has been [pared back significantly][prelude] such
9931 that it is the minimum necessary to support the most pervasive
9932 code patterns, and through [generalized where clauses][where]
9933 many of the prelude extension traits have been consolidated.
9934 * Rust's rudimentary reflection [has been removed][refl], as it
9935 incurred too much code generation for little benefit.
9936 * [Struct variants][structvars] are no longer feature-gated.
9937 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9938 known as 'higher-ranked trait bounds', this crucially allows
9939 unboxed closures to work.
9940 * Macros invocations surrounded by parens or square brackets and
9941 not terminated by a semicolon are [parsed as
9942 expressions][macros], which makes expressions like `vec![1i32,
9943 2, 3].len()` work as expected.
9944 * Trait objects now implement their traits automatically, and
9945 traits that can be coerced to objects now must be [object
9947 * Automatically deriving traits is now done with `#[derive(...)]`
9948 not `#[deriving(...)]` for [consistency with other naming
9949 conventions][derive].
9950 * Importing the containing module or enum at the same time as
9951 items or variants they contain is [now done with `self` instead
9952 of `mod`][self], as in use `foo::{self, bar}`
9953 * Glob imports are no longer feature-gated.
9954 * The `box` operator and `box` patterns have been feature-gated
9955 pending a redesign. For now unique boxes should be allocated
9956 like other containers, with `Box::new`.
9960 * A [series][coll1] of [efforts][coll2] to establish
9961 [conventions][coll3] for collections types has resulted in API
9962 improvements throughout the standard library.
9963 * New [APIs for error handling][err] provide ergonomic interop
9964 between error types, and [new conventions][err-conv] describe
9965 more clearly the recommended error handling strategies in Rust.
9966 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9967 it is easier to discuss failure in the context of error handling
9968 without making clarifications as to whether you are referring to
9969 the 'fail' macro or failure more generally.
9970 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9971 syscall when available.
9972 * The 'serialize' crate has been renamed 'rustc-serialize' and
9973 moved out of the distribution to Cargo. Although it is widely
9974 used now, it is expected to be superseded in the near future.
9975 * The `Show` formatter, typically implemented with
9976 `#[derive(Show)]` is [now requested with the `{:?}`
9977 specifier][show] and is intended for use by all types, for uses
9978 such as `println!` debugging. The new `String` formatter must be
9979 implemented by hand, uses the `{}` specifier, and is intended
9980 for full-fidelity conversions of things that can logically be
9981 represented as strings.
9985 * [Flexible target specification][flex] allows rustc's code
9986 generation to be configured to support otherwise-unsupported
9988 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9989 respective debuggers with Rust-appropriate pretty-printing.
9990 * The Windows installation of Rust is distributed with the
9991 MinGW components currently required to link binaries on that
9996 * Nullable enum optimizations have been extended to more types so
9997 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9998 space than the inner types themselves.
9999 * Work has begun on supporting AArch64.
10001 [Cargo]: https://crates.io
10002 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10003 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10004 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10005 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10006 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10007 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10008 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10009 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10010 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10011 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10012 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10013 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10014 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10015 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10016 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10017 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10018 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10019 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10020 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10021 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10022 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10023 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10024 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10025 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10026 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10027 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10028 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10029 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10030 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10031 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10032 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10033 [trpl]: https://doc.rust-lang.org/book/index.html
10034 [rbe]: http://rustbyexample.com/
10037 Version 0.12.0 (2014-10-09)
10038 =============================
10040 * ~1900 changes, numerous bugfixes
10044 * The introductory documentation (now called The Rust Guide) has
10045 been completely rewritten, as have a number of supplementary
10047 * Rust's package manager, Cargo, continues to improve and is
10048 sometimes considered to be quite awesome.
10049 * Many API's in `std` have been reviewed and updated for
10050 consistency with the in-development Rust coding
10051 guidelines. The standard library documentation tracks
10052 stabilization progress.
10053 * Minor libraries have been moved out-of-tree to the rust-lang org
10054 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10055 be installed with Cargo.
10056 * Lifetime elision allows lifetime annotations to be left off of
10057 function declarations in many common scenarios.
10058 * Rust now works on 64-bit Windows.
10061 * Indexing can be overloaded with the `Index` and `IndexMut`
10063 * The `if let` construct takes a branch only if the `let` pattern
10064 matches, currently behind the 'if_let' feature gate.
10065 * 'where clauses', a more flexible syntax for specifying trait
10066 bounds that is more aesthetic, have been added for traits and
10067 free functions. Where clauses will in the future make it
10068 possible to constrain associated types, which would be
10069 impossible with the existing syntax.
10070 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10071 the 'slicing_syntax' feature gate, and can be overloaded with
10072 the `Slice` or `SliceMut` traits.
10073 * The syntax for matching of sub-slices has been changed to use a
10074 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10075 consistency with other uses of `..` and to future-proof
10076 potential additional uses of the syntax.
10077 * The syntax for matching inclusive ranges in patterns has changed
10078 from `0..3` to `0...4` to be consistent with the exclusive range
10079 syntax for slicing.
10080 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10081 c]`) has been put behind the 'advanced_slice_patterns' feature
10082 gate and may be removed in the future.
10083 * Components of tuples and tuple structs can be extracted using
10084 the `value.0` syntax, currently behind the `tuple_indexing`
10086 * The `#[crate_id]` attribute is no longer supported; versioning
10087 is handled by the package manager.
10088 * Renaming crate imports are now written `extern crate foo as bar`
10089 instead of `extern crate bar = foo`.
10090 * Renaming use statements are now written `use foo as bar` instead
10091 of `use bar = foo`.
10092 * `let` and `match` bindings and argument names in macros are now
10094 * The new, more efficient, closure types ('unboxed closures') have
10095 been added under a feature gate, 'unboxed_closures'. These will
10096 soon replace the existing closure types, once higher-ranked
10097 trait lifetimes are added to the language.
10098 * `move` has been added as a keyword, for indicating closures
10099 that capture by value.
10100 * Mutation and assignment is no longer allowed in pattern guards.
10101 * Generic structs and enums can now have trait bounds.
10102 * The `Share` trait is now called `Sync` to free up the term
10103 'shared' to refer to 'shared reference' (the default reference
10105 * Dynamically-sized types have been mostly implemented,
10106 unifying the behavior of fat-pointer types with the rest of the
10108 * As part of dynamically-sized types, the `Sized` trait has been
10109 introduced, which qualifying types implement by default, and
10110 which type parameters expect by default. To specify that a type
10111 parameter does not need to be sized, write `<Sized? T>`. Most
10112 types are `Sized`, notable exceptions being unsized arrays
10113 (`[T]`) and trait types.
10114 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10115 * Lifetime bounds can now be applied to type parameters and object
10117 * The old, reference counted GC type, `Gc<T>` which was once
10118 denoted by the `@` sigil, has finally been removed. GC will be
10119 revisited in the future.
10122 * Library documentation has been improved for a number of modules.
10123 * Bit-vectors, collections::bitv has been modernized.
10124 * The url crate is deprecated in favor of
10125 http://github.com/servo/rust-url, which can be installed with
10127 * Most I/O stream types can be cloned and subsequently closed from
10128 a different thread.
10129 * A `std::time::Duration` type has been added for use in I/O
10130 methods that rely on timers, as well as in the 'time' crate's
10131 `Timespec` arithmetic.
10132 * The runtime I/O abstraction layer that enabled the green thread
10133 scheduler to do non-thread-blocking I/O has been removed, along
10134 with the libuv-based implementation employed by the green thread
10135 scheduler. This will greatly simplify the future I/O work.
10136 * `collections::btree` has been rewritten to have a more
10137 idiomatic and efficient design.
10140 * rustdoc output now indicates the stability levels of API's.
10141 * The `--crate-name` flag can specify the name of the crate
10142 being compiled, like `#[crate_name]`.
10143 * The `-C metadata` specifies additional metadata to hash into
10144 symbol names, and `-C extra-filename` specifies additional
10145 information to put into the output filename, for use by the
10146 package manager for versioning.
10147 * debug info generation has continued to improve and should be
10148 more reliable under both gdb and lldb.
10149 * rustc has experimental support for compiling in parallel
10150 using the `-C codegen-units` flag.
10151 * rustc no longer encodes rpath information into binaries by
10155 * Stack usage has been optimized with LLVM lifetime annotations.
10156 * Official Rust binaries on Linux are more compatible with older
10157 kernels and distributions, built on CentOS 5.10.
10160 Version 0.11.0 (2014-07-02)
10161 ==========================
10163 * ~1700 changes, numerous bugfixes
10166 * ~[T] has been removed from the language. This type is superseded by
10168 * ~str has been removed from the language. This type is superseded by
10170 * ~T has been removed from the language. This type is superseded by the
10172 * @T has been removed from the language. This type is superseded by the
10173 standard library's std::gc::Gc<T> type.
10174 * Struct fields are now all private by default.
10175 * Vector indices and shift amounts are both required to be a `uint`
10176 instead of any integral type.
10177 * Byte character, byte string, and raw byte string literals are now all
10178 supported by prefixing the normal literal with a `b`.
10179 * Multiple ABIs are no longer allowed in an ABI string
10180 * The syntax for lifetimes on closures/procedures has been tweaked
10181 slightly: `<'a>|A, B|: 'b + K -> T`
10182 * Floating point modulus has been removed from the language; however it
10183 is still provided by a library implementation.
10184 * Private enum variants are now disallowed.
10185 * The `priv` keyword has been removed from the language.
10186 * A closure can no longer be invoked through a &-pointer.
10187 * The `use foo, bar, baz;` syntax has been removed from the language.
10188 * The transmute intrinsic no longer works on type parameters.
10189 * Statics now allow blocks/items in their definition.
10190 * Trait bounds are separated from objects with + instead of : now.
10191 * Objects can no longer be read while they are mutably borrowed.
10192 * The address of a static is now marked as insignificant unless the
10193 #[inline(never)] attribute is placed it.
10194 * The #[unsafe_destructor] attribute is now behind a feature gate.
10195 * Struct literals are no longer allowed in ambiguous positions such as
10196 if, while, match, and for..in.
10197 * Declaration of lang items and intrinsics are now feature-gated by
10199 * Integral literals no longer default to `int`, and floating point
10200 literals no longer default to `f64`. Literals must be suffixed with an
10201 appropriate type if inference cannot determine the type of the
10203 * The Box<T> type is no longer implicitly borrowed to &mut T.
10204 * Procedures are now required to not capture borrowed references.
10207 * The standard library is now a "facade" over a number of underlying
10208 libraries. This means that development on the standard library should
10209 be speedier due to smaller crates, as well as a clearer line between
10211 * A new library, libcore, lives under the standard library's facade
10212 which is Rust's "0-assumption" library, suitable for embedded and
10213 kernel development for example.
10214 * A regex crate has been added to the standard distribution. This crate
10215 includes statically compiled regular expressions.
10216 * The unwrap/unwrap_err methods on Result require a Show bound for
10217 better error messages.
10218 * The return types of the std::comm primitives have been centralized
10219 around the Result type.
10220 * A number of I/O primitives have gained the ability to time out their
10222 * A number of I/O primitives have gained the ability to close their
10223 reading/writing halves to cancel pending operations.
10224 * Reverse iterator methods have been removed in favor of `rev()` on
10225 their forward-iteration counterparts.
10226 * A bitflags! macro has been added to enable easy interop with C and
10227 management of bit flags.
10228 * A debug_assert! macro is now provided which is disabled when
10229 `--cfg ndebug` is passed to the compiler.
10230 * A graphviz crate has been added for creating .dot files.
10231 * The std::cast module has been migrated into std::mem.
10232 * The std::local_data api has been migrated from freestanding functions
10233 to being based on methods.
10234 * The Pod trait has been renamed to Copy.
10235 * jemalloc has been added as the default allocator for types.
10236 * The API for allocating memory has been changed to use proper alignment
10237 and sized deallocation
10238 * Connecting a TcpStream or binding a TcpListener is now based on a
10239 string address and a u16 port. This allows connecting to a hostname as
10241 * The Reader trait now contains a core method, read_at_least(), which
10242 correctly handles many repeated 0-length reads.
10243 * The process-spawning API is now centered around a builder-style
10245 * The :? printing qualifier has been moved from the standard library to
10246 an external libdebug crate.
10247 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10248 have been renamed to Eq/Ord.
10249 * The select/plural methods have been removed from format!. The escapes
10250 for { and } have also changed from \{ and \} to {{ and }},
10252 * The TaskBuilder API has been re-worked to be a true builder, and
10253 extension traits for spawning native/green tasks have been added.
10256 * All breaking changes to the language or libraries now have their
10257 commit message annotated with `[breaking-change]` to allow for easy
10258 discovery of breaking changes.
10259 * The compiler will now try to suggest how to annotate lifetimes if a
10260 lifetime-related error occurs.
10261 * Debug info continues to be improved greatly with general bug fixes and
10262 better support for situations like link time optimization (LTO).
10263 * Usage of syntax extensions when cross-compiling has been fixed.
10264 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10265 -fdata-sections and --gc-sections has been enabled by default
10266 * The compiler is now stricter about where it will load module files
10267 from when a module is declared via `mod foo;`.
10268 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10269 Syntax extensions are now discovered via a "plugin registrar" type
10270 which will be extended in the future to other various plugins.
10271 * Lints have been restructured to allow for dynamically loadable lints.
10272 * A number of rustdoc improvements:
10273 * The HTML output has been visually redesigned.
10274 * Markdown is now powered by hoedown instead of sundown.
10275 * Searching heuristics have been greatly improved.
10276 * The search index has been reduced in size by a great amount.
10277 * Cross-crate documentation via `pub use` has been greatly improved.
10278 * Primitive types are now hyperlinked and documented.
10279 * Documentation has been moved from static.rust-lang.org/doc to
10281 * A new sandbox, play.rust-lang.org, is available for running and
10282 sharing rust code examples on-line.
10283 * Unused attributes are now more robustly warned about.
10284 * The dead_code lint now warns about unused struct fields.
10285 * Cross-compiling to iOS is now supported.
10286 * Cross-compiling to mipsel is now supported.
10287 * Stability attributes are now inherited by default and no longer apply
10288 to intra-crate usage, only inter-crate usage.
10289 * Error message related to non-exhaustive match expressions have been
10293 Version 0.10 (2014-04-03)
10294 =========================
10296 * ~1500 changes, numerous bugfixes
10299 * A new RFC process is now in place for modifying the language.
10300 * Patterns with `@`-pointers have been removed from the language.
10301 * Patterns with unique vectors (`~[T]`) have been removed from the
10303 * Patterns with unique strings (`~str`) have been removed from the
10305 * `@str` has been removed from the language.
10306 * `@[T]` has been removed from the language.
10307 * `@self` has been removed from the language.
10308 * `@Trait` has been removed from the language.
10309 * Headers on `~` allocations which contain `@` boxes inside the type for
10310 reference counting have been removed.
10311 * The semantics around the lifetimes of temporary expressions have changed,
10312 see #3511 and #11585 for more information.
10313 * Cross-crate syntax extensions are now possible, but feature gated. See
10314 #11151 for more information. This includes both `macro_rules!` macros as
10315 well as syntax extensions such as `format!`.
10316 * New lint modes have been added, and older ones have been turned on to be
10318 * Unnecessary parentheses
10319 * Uppercase statics
10321 * Uppercase variables
10322 * Publicly visible private types
10323 * `#[deriving]` with raw pointers
10324 * Unsafe functions can no longer be coerced to closures.
10325 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10326 * The `#[simd]` attribute is now behind a feature gate.
10327 * Visibility is no longer allowed on `extern crate` statements, and
10328 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10329 * Trailing commas are now allowed in argument lists and tuple patterns.
10330 * The `do` keyword has been removed, it is now a reserved keyword.
10331 * Default type parameters have been implemented, but are feature gated.
10332 * Borrowed variables through captures in closures are now considered soundly.
10333 * `extern mod` is now `extern crate`
10334 * The `Freeze` trait has been removed.
10335 * The `Share` trait has been added for types that can be shared among
10337 * Labels in macros are now hygienic.
10338 * Expression/statement macro invocations can be delimited with `{}` now.
10339 * Treatment of types allowed in `static mut` locations has been tweaked.
10340 * The `*` and `.` operators are now overloadable through the `Deref` and
10342 * `~Trait` and `proc` no longer have `Send` bounds by default.
10343 * Partial type hints are now supported with the `_` type marker.
10344 * An `Unsafe` type was introduced for interior mutability. It is now
10345 considered undefined to transmute from `&T` to `&mut T` without using the
10347 * The #[linkage] attribute was implemented for extern statics/functions.
10348 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10349 * `Pod` was renamed to `Copy`.
10352 * The `libextra` library has been removed. It has now been decomposed into
10353 component libraries with smaller and more focused nuggets of
10354 functionality. The full list of libraries can be found on the
10355 documentation index page.
10356 * std: `std::condition` has been removed. All I/O errors are now propagated
10357 through the `Result` type. In order to assist with error handling, a
10358 `try!` macro for unwrapping errors with an early return and a lint for
10359 unused results has been added. See #12039 for more information.
10360 * std: The `vec` module has been renamed to `slice`.
10361 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10362 This will become the only growable vector in the future.
10363 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10364 are now found at `std::io::BufferedReader` instead of
10365 `std::io::buffered::BufferedReader`.
10366 * std: `print` and `println` are no longer in the prelude, the `print!` and
10367 `println!` macros are intended to be used instead.
10368 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10369 attempts to statically prevent cycles.
10370 * std: The standard distribution is adopting the policy of pushing failure
10371 to the user rather than failing in libraries. Many functions (such as
10372 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10373 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10374 deriving mode: `#[deriving(Show)]`.
10375 * std: `ToStr` is now implemented for all types implementing `Show`.
10376 * std: The formatting trait methods now take `&self` instead of `&T`
10377 * std: The `invert()` method on iterators has been renamed to `rev()`
10378 * std: `std::num` has seen a reduction in the genericity of its traits,
10379 consolidating functionality into a few core traits.
10380 * std: Backtraces are now printed on task failure if the environment
10381 variable `RUST_BACKTRACE` is present.
10382 * std: Naming conventions for iterators have been standardized. More details
10383 can be found on the wiki's style guide.
10384 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10385 still implement the function.
10386 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10387 * std: `assert_approx_eq!` has been removed
10388 * std: The `e` and `E` formatting specifiers for floats have been added to
10389 print them in exponential notation.
10390 * std: The `Times` trait has been removed
10391 * std: Indications of variance and opting out of builtin bounds is done
10392 through marker types in `std::kinds::marker` now
10393 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10394 `#[deriving(Hash)]` is now possible.
10395 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10396 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10397 * std: `Chan::new` is now `channel()`.
10398 * std: A new synchronous channel type has been implemented.
10399 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10400 * std: `hashmap` and `trie` have been moved to `libcollections`
10401 * std: `run` has been rolled into `io::process`
10402 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10403 * std: The equality and comparison traits have seen some reorganization.
10404 * std: `rand` has moved to `librand`.
10405 * std: `to_{lower,upper}case` has been implemented for `char`.
10406 * std: Logging has been moved to `liblog`.
10407 * collections: `HashMap` has been rewritten for higher performance and less
10409 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10410 it can be booted manually. The runtime guide has more information and
10412 * native: All I/O functionality except signals has been implemented.
10413 * green: Task spawning with `libgreen` has been optimized with stack caching
10414 and various trimming of code.
10415 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10416 * sync: The `extra::sync` module has been updated to modern rust (and moved
10417 to the `sync` library), tweaking and improving various interfaces while
10418 dropping redundant functionality.
10419 * sync: A new `Barrier` type has been added to the `sync` library.
10420 * sync: An efficient mutex for native and green tasks has been implemented.
10421 * serialize: The `base64` module has seen some improvement. It treats
10422 newlines better, has non-string error values, and has seen general
10424 * fourcc: A `fourcc!` macro was introduced
10425 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10426 hexadecimal literal.
10429 * `rustpkg` has been deprecated and removed from the main repository. Its
10430 replacement, `cargo`, is under development.
10431 * Nightly builds of rust are now available
10432 * The memory usage of rustc has been improved many times throughout this
10434 * The build process supports disabling rpath support for the rustc binary
10436 * Code generation has improved in some cases, giving more information to the
10437 LLVM optimization passes to enable more extensive optimizations.
10438 * Debuginfo compatibility with lldb on OSX has been restored.
10439 * The master branch is now gated on an android bot, making building for
10440 android much more reliable.
10441 * Output flags have been centralized into one `--emit` flag.
10442 * Crate type flags have been centralized into one `--crate-type` flag.
10443 * Codegen flags have been consolidated behind a `-C` flag.
10444 * Linking against outdated crates now has improved error messages.
10445 * Error messages with lifetimes will often suggest how to annotate the
10446 function to fix the error.
10447 * Many more types are documented in the standard library, and new guides
10449 * Many `rustdoc` improvements:
10450 * code blocks are syntax highlighted.
10451 * render standalone markdown files.
10452 * the --test flag tests all code blocks by default.
10453 * exported macros are displayed.
10454 * re-exported types have their documentation inlined at the location of the
10456 * search works across crates that have been rendered to the same output
10460 Version 0.9 (2014-01-09)
10461 ==========================
10463 * ~1800 changes, numerous bugfixes
10466 * The `float` type has been removed. Use `f32` or `f64` instead.
10467 * A new facility for enabling experimental features (feature gating) has
10468 been added, using the crate-level `#[feature(foo)]` attribute.
10469 * Managed boxes (@) are now behind a feature gate
10470 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10471 standard library's `Gc` or `Rc` types instead.
10472 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10473 * Jumping back to the top of a loop is now done with `continue` instead of
10475 * Strings can no longer be mutated through index assignment.
10476 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10477 hash delimiters, as in `r###"foo"###`.
10478 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10480 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10481 * `@fn`s have been removed.
10482 * `do` only works with procs in order to make it obvious what the cost
10484 * Single-element tuple-like structs can no longer be dereferenced to
10485 obtain the inner value. A more comprehensive solution for overloading
10486 the dereference operator will be provided in the future.
10487 * The `#[link(...)]` attribute has been replaced with
10488 `#[crate_id = "name#vers"]`.
10489 * Empty `impl`s must be terminated with empty braces and may not be
10490 terminated with a semicolon.
10491 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10492 no longer has any special meaning.
10493 * The old `fmt!` string formatting macro has been removed.
10494 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10495 `print!` and `println!`.
10496 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10497 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10498 `extern mod foo = "bar"` instead.
10499 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10500 * Macros can have attributes.
10501 * Macros can expand to items with attributes.
10502 * Macros can expand to multiple items.
10503 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10504 * Comments may be nested.
10505 * Values automatically coerce to trait objects they implement, without
10507 * Enum discriminants are no longer an entire word but as small as needed to
10508 contain all the variants. The `repr` attribute can be used to override
10509 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10510 `#[repr(C)]` to match C enums.
10511 * Non-string literals are not allowed in attributes (they never worked).
10512 * The FFI now supports variadic functions.
10513 * Octal numeric literals, as in `0o7777`.
10514 * The `concat!` syntax extension performs compile-time string concatenation.
10515 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10516 removed as Rust no longer uses segmented stacks.
10517 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10518 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10519 not `*`; ignoring remaining fields of a struct is also done with `..`,
10520 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10521 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10522 * `rustc` supports the "system" calling convention, which defaults to the
10523 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10525 * The `type_overflow` lint (default: warn) checks literals for overflow.
10526 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10527 * The `attribute_usage` lint (default: warn) warns about unknown
10529 * The `unknown_features` lint (default: warn) warns about unknown
10531 * The `dead_code` lint (default: warn) checks for dead code.
10532 * Rust libraries can be linked statically to one another
10533 * `#[link_args]` is behind the `link_args` feature gate.
10534 * Native libraries are now linked with `#[link(name = "foo")]`
10535 * Native libraries can be statically linked to a rust crate
10536 (`#[link(name = "foo", kind = "static")]`).
10537 * Native OS X frameworks are now officially supported
10538 (`#[link(name = "foo", kind = "framework")]`).
10539 * The `#[thread_local]` attribute creates thread-local (not task-local)
10540 variables. Currently behind the `thread_local` feature gate.
10541 * The `return` keyword may be used in closures.
10542 * Types that can be copied via a memcpy implement the `Pod` kind.
10543 * The `cfg` attribute can now be used on struct fields and enum variants.
10546 * std: The `option` and `result` API's have been overhauled to make them
10547 simpler, more consistent, and more composable.
10548 * std: The entire `std::io` module has been replaced with one that is
10549 more comprehensive and that properly interfaces with the underlying
10550 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10552 * std: `io::util` contains a number of useful implementations of
10553 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10554 `ZeroReader`, `TeeReader`.
10555 * std: The reference counted pointer type `extra::rc` moved into std.
10556 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10557 just a wrapper around it).
10558 * std: The `Either` type has been removed.
10559 * std: `fmt::Default` can be implemented for any type to provide default
10560 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10561 * std: The `rand` API continues to be tweaked.
10562 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10563 on failure in gdb, is now named `rust_fail`.
10564 * std: The `each_key` and `each_value` methods on `HashMap` have been
10565 replaced by the `keys` and `values` iterators.
10566 * std: Functions dealing with type size and alignment have moved from the
10567 `sys` module to the `mem` module.
10568 * std: The `path` module was written and API changed.
10569 * std: `str::from_utf8` has been changed to cast instead of allocate.
10570 * std: `starts_with` and `ends_with` methods added to vectors via the
10571 `ImmutableEqVector` trait, which is in the prelude.
10572 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10573 if the index is out of bounds.
10574 * std: Task failure no longer propagates between tasks, as the model was
10575 complex, expensive, and incompatible with thread-based tasks.
10576 * std: The `Any` type can be used for dynamic typing.
10577 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10579 * std: Methods that produce iterators generally do not have an `_iter`
10581 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10582 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10583 * std: `util::ignore` renamed to `prelude::drop`.
10584 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10586 * std: `vec::raw` has seen a lot of cleanup and API changes.
10587 * std: The standard library no longer includes any C++ code, and very
10588 minimal C, eliminating the dependency on libstdc++.
10589 * std: Runtime scheduling and I/O functionality has been factored out into
10590 extensible interfaces and is now implemented by two different crates:
10591 libnative, for native threading and I/O; and libgreen, for green threading
10592 and I/O. This paves the way for using the standard library in more limited
10593 embedded environments.
10594 * std: The `comm` module has been rewritten to be much faster, have a
10595 simpler, more consistent API, and to work for both native and green
10597 * std: All libuv dependencies have been moved into the rustuv crate.
10598 * native: New implementations of runtime scheduling on top of OS threads.
10599 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10601 * green: The green thread scheduler and message passing types are almost
10602 entirely lock-free.
10603 * extra: The `flatpipes` module had bitrotted and was removed.
10604 * extra: All crypto functions have been removed and Rust now has a policy of
10605 not reimplementing crypto in the standard library. In the future crypto
10606 will be provided by external crates with bindings to established libraries.
10607 * extra: `c_vec` has been modernized.
10608 * extra: The `sort` module has been removed. Use the `sort` method on
10612 * The `rust` and `rusti` commands have been removed, due to lack of
10614 * `rustdoc` was completely rewritten.
10615 * `rustdoc` can test code examples in documentation.
10616 * `rustpkg` can test packages with the argument, 'test'.
10617 * `rustpkg` supports arbitrary dependencies, including C libraries.
10618 * `rustc`'s support for generating debug info is improved again.
10619 * `rustc` has better error reporting for unbalanced delimiters.
10620 * `rustc`'s JIT support was removed due to bitrot.
10621 * Executables and static libraries can be built with LTO (-Z lto)
10622 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10626 Version 0.8 (2013-09-26)
10627 ============================
10629 * ~2200 changes, numerous bugfixes
10632 * The `for` loop syntax has changed to work with the `Iterator` trait.
10633 * At long last, unwinding works on Windows.
10634 * Default methods are ready for use.
10635 * Many trait inheritance bugs fixed.
10636 * Owned and borrowed trait objects work more reliably.
10637 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10638 * rustc can omit emission of code for the `debug!` macro if it is passed
10640 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10641 for foo.rs, then foo/mod.rs, and will generate an error when both are
10643 * Strings no longer contain trailing nulls. The new `std::c_str` module
10644 provides new mechanisms for converting to C strings.
10645 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10646 * The FFI has been overhauled such that foreign functions are called directly,
10647 instead of through a stack-switching wrapper.
10648 * Calling a foreign function must be done through a Rust function with the
10649 `#[fixed_stack_segment]` attribute.
10650 * The `externfn!` macro can be used to declare both a foreign function and
10651 a `#[fixed_stack_segment]` wrapper at once.
10652 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10653 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10654 * `priv` is disallowed everywhere except for struct fields and enum variants.
10655 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10656 * `ref` bindings in irrefutable patterns work correctly now.
10657 * `char` is now prevented from containing invalid code points.
10658 * Casting to `bool` is no longer allowed.
10659 * `\0` is now accepted as an escape in chars and strings.
10660 * `yield` is a reserved keyword.
10661 * `typeof` is a reserved keyword.
10662 * Crates may be imported by URL with `extern mod foo = "url";`.
10663 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10664 * Static vectors can be initialized with repeating elements,
10665 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10666 * Static structs can be initialized with functional record update,
10667 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10668 * `cfg!` can be used to conditionally execute code based on the crate
10669 configuration, similarly to `#[cfg(...)]`.
10670 * The `unnecessary_qualification` lint detects unneeded module
10671 prefixes (default: allow).
10672 * Arithmetic operations have been implemented on the SIMD types in
10673 `std::unstable::simd`.
10674 * Exchange allocation headers were removed, reducing memory usage.
10675 * `format!` implements a completely new, extensible, and higher-performance
10676 string formatting system. It will replace `fmt!`.
10677 * `print!` and `println!` write formatted strings (using the `format!`
10678 extension) to stdout.
10679 * `write!` and `writeln!` write formatted strings (using the `format!`
10680 extension) to the new Writers in `std::rt::io`.
10681 * The library section in which a function or static is placed may
10682 be specified with `#[link_section = "..."]`.
10683 * The `proto!` syntax extension for defining bounded message protocols
10685 * `macro_rules!` is hygienic for `let` declarations.
10686 * The `#[export_name]` attribute specifies the name of a symbol.
10687 * `unreachable!` can be used to indicate unreachable code, and fails
10691 * std: Transitioned to the new runtime, written in Rust.
10692 * std: Added an experimental I/O library, `rt::io`, based on the new
10694 * std: A new generic `range` function was added to the prelude, replacing
10695 `uint::range` and friends.
10696 * std: `range_rev` no longer exists. Since range is an iterator it can be
10697 reversed with `range(lo, hi).invert()`.
10698 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10699 renamed to `unwrap_or`.
10700 * std: The `iterator` module was renamed to `iter`.
10701 * std: Integral types now support the `checked_add`, `checked_sub`, and
10702 `checked_mul` operations for detecting overflow.
10703 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10705 * std: Methods are standardizing on conventions for casting methods:
10706 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10708 * std: The `CString` type in `c_str` provides new ways to convert to and
10710 * std: `DoubleEndedIterator` can yield elements in two directions.
10711 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10713 * std: `str::from_bytes` renamed to `str::from_utf8`.
10714 * std: `pop_opt` and `shift_opt` methods added to vectors.
10715 * std: The task-local data interface no longer uses @, and keys are
10716 no longer function pointers.
10717 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10718 * std: Added `SharedPort` to `comm`.
10719 * std: `Eq` has a default method for `ne`; only `eq` is required
10720 in implementations.
10721 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10722 is required in implementations.
10723 * std: `is_utf8` performance is improved, impacting many string functions.
10724 * std: `os::MemoryMap` provides cross-platform mmap.
10725 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10726 are not 'in-bounds' are considered undefined.
10727 * std: Many freestanding functions in `vec` removed in favor of methods.
10728 * std: Many freestanding functions on scalar types removed in favor of
10730 * std: Many options to task builders were removed since they don't make
10731 sense in the new scheduler design.
10732 * std: More containers implement `FromIterator` so can be created by the
10734 * std: More complete atomic types in `unstable::atomics`.
10735 * std: `comm::PortSet` removed.
10736 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10737 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10738 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10739 default implementations.
10740 * std: Various `from_str` functions were removed in favor of a generic
10741 `from_str` which is available in the prelude.
10742 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10743 * extra: `dlist`, the doubly-linked list was modernized.
10744 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10745 * extra: Added `glob` module, replacing `std::os::glob`.
10746 * extra: `rope` was removed.
10747 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10748 * extra: `net`, and `timer` were removed. The experimental replacements
10749 are `std::rt::io::net` and `std::rt::io::timer`.
10750 * extra: Iterators implemented for `SmallIntMap`.
10751 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10752 * extra: `SmallIntSet` removed. Use `BitvSet`.
10753 * extra: Performance of JSON parsing greatly improved.
10754 * extra: `semver` updated to SemVer 2.0.0.
10755 * extra: `term` handles more terminals correctly.
10756 * extra: `dbg` module removed.
10757 * extra: `par` module removed.
10758 * extra: `future` was cleaned up, with some method renames.
10759 * extra: Most free functions in `getopts` were converted to methods.
10762 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10763 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10764 similarly to gcc's `--march` flag.
10765 * rustc's performance compiling small crates is much better.
10766 * rustpkg has received many improvements.
10767 * rustpkg supports git tags as package IDs.
10768 * rustpkg builds into target-specific directories so it can be used for
10770 * The number of concurrent test tasks is controlled by the environment
10771 variable RUST_TEST_TASKS.
10772 * The test harness can now report metrics for benchmarks.
10773 * All tools have man pages.
10774 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10775 * The runtime uses jemalloc for allocations.
10776 * Segmented stacks are temporarily disabled as part of the transition to
10777 the new runtime. Stack overflows are possible!
10778 * A new documentation backend, rustdoc_ng, is available for use. It is
10779 still invoked through the normal `rustdoc` command.
10782 Version 0.7 (2013-07-03)
10783 =======================
10785 * ~2000 changes, numerous bugfixes
10788 * `impl`s no longer accept a visibility qualifier. Put them on methods
10790 * The borrow checker has been rewritten with flow-sensitivity, fixing
10791 many bugs and inconveniences.
10792 * The `self` parameter no longer implicitly means `&'self self`,
10793 and can be explicitly marked with a lifetime.
10794 * Overloadable compound operators (`+=`, etc.) have been temporarily
10795 removed due to bugs.
10796 * The `for` loop protocol now requires `for`-iterators to return `bool`
10797 so they compose better.
10798 * The `Durable` trait is replaced with the `'static` bounds.
10799 * Trait default methods work more often.
10800 * Structs with the `#[packed]` attribute have byte alignment and
10801 no padding between fields.
10802 * Type parameters bound by `Copy` must now be copied explicitly with
10803 the `copy` keyword.
10804 * It is now illegal to move out of a dereferenced unsafe pointer.
10805 * `Option<~T>` is now represented as a nullable pointer.
10806 * `@mut` does dynamic borrow checks correctly.
10807 * The `main` function is only detected at the topmost level of the crate.
10808 The `#[main]` attribute is still valid anywhere.
10809 * Struct fields may no longer be mutable. Use inherited mutability.
10810 * The `#[no_send]` attribute makes a type that would otherwise be
10812 * The `#[no_freeze]` attribute makes a type that would otherwise be
10814 * Unbounded recursion will abort the process after reaching the limit
10815 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10816 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10817 are never implicitly copyable.
10818 * `#[static_assert]` makes compile-time assertions about static bools.
10819 * At long last, 'argument modes' no longer exist.
10820 * The rarely used `use mod` statement no longer exists.
10822 * Syntax extensions
10823 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10825 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10826 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10827 `#[deriving(...)]`.
10828 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10829 and unsuffixed integer literals.
10832 * The `core` crate was renamed to `std`.
10833 * The `std` crate was renamed to `extra`.
10834 * More and improved documentation.
10835 * std: `iterator` module for external iterator objects.
10836 * Many old-style (internal, higher-order function) iterators replaced by
10837 implementations of `Iterator`.
10838 * std: Many old internal vector and string iterators,
10839 incl. `any`, `all`. removed.
10840 * std: The `finalize` method of `Drop` renamed to `drop`.
10841 * std: The `drop` method now takes `&mut self` instead of `&self`.
10842 * std: The prelude no longer re-exports any modules, only types and traits.
10843 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10844 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10845 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10846 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10847 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10848 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10849 * std: Many types implement `Clone`.
10850 * std: `path` type renamed to `Path`.
10851 * std: `mut` module and `Mut` type removed.
10852 * std: Many standalone functions removed in favor of methods and iterators
10853 in `vec`, `str`. In the future methods will also work as functions.
10854 * std: `reinterpret_cast` removed. Use `transmute`.
10855 * std: ascii string handling in `std::ascii`.
10856 * std: `Rand` is implemented for ~/@.
10857 * std: `run` module for spawning processes overhauled.
10858 * std: Various atomic types added to `unstable::atomic`.
10859 * std: Various types implement `Zero`.
10860 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10861 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10862 * std: Added `os::mkdir_recursive`.
10863 * std: Added `os::glob` function performs filesystems globs.
10864 * std: `FuzzyEq` renamed to `ApproxEq`.
10865 * std: `Map` now defines `pop` and `swap` methods.
10866 * std: `Cell` constructors converted to static methods.
10867 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10868 * extra: `flate` module moved from `std` to `extra`.
10869 * extra: `fileinput` module for iterating over a series of files.
10870 * extra: `Complex` number type and `complex` module.
10871 * extra: `Rational` number type and `rational` module.
10872 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10873 * extra: `term` uses terminfo now, is more correct.
10874 * extra: `arc` functions converted to methods.
10875 * extra: Implementation of fixed output size variations of SHA-2.
10878 * `unused_variables` lint mode for unused variables (default: warn).
10879 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10881 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10883 * `dead_assignment` lint mode for unread variables (default: warn).
10884 * `unnecessary_allocation` lint mode detects some heap allocations that are
10885 immediately borrowed so could be written without allocating (default: warn).
10886 * `missing_doc` lint mode (default: allow).
10887 * `unreachable_code` lint mode (default: warn).
10888 * The `rusti` command has been rewritten and a number of bugs addressed.
10889 * rustc outputs in color on more terminals.
10890 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10891 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10892 * Compiling with `-g` will make the binary record information about
10893 dynamic borrowcheck failures for debugging.
10894 * rustdoc has a nicer stylesheet.
10895 * Various improvements to rustdoc.
10896 * Improvements to rustpkg (see the detailed release notes).
10899 Version 0.6 (2013-04-03)
10900 ========================
10902 * ~2100 changes, numerous bugfixes
10905 * The self type parameter in traits is now spelled `Self`
10906 * The `self` parameter in trait and impl methods must now be explicitly
10907 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10908 * Static methods no longer require the `static` keyword and instead
10909 are distinguished by the lack of a `self` parameter
10910 * Replaced the `Durable` trait with the `'static` lifetime
10911 * The old closure type syntax with the trailing sigil has been
10912 removed in favor of the more consistent leading sigil
10913 * `super` is a keyword, and may be prefixed to paths
10914 * Trait bounds are separated with `+` instead of whitespace
10915 * Traits are implemented with `impl Trait for Type`
10916 instead of `impl Type: Trait`
10917 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10918 * The `export` keyword has finally been removed
10919 * The `move` keyword has been removed (see "Semantic changes")
10920 * The interior mutability qualifier on vectors, `[mut T]`, has been
10921 removed. Use `&mut [T]`, etc.
10922 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10923 * `fail` is no longer a keyword. Use `fail!()`
10924 * `assert` is no longer a keyword. Use `assert!()`
10925 * `log` is no longer a keyword. use `debug!`, etc.
10926 * 1-tuples may be represented as `(T,)`
10927 * Struct fields may no longer be `mut`. Use inherited mutability,
10928 `@mut T`, `core::mut` or `core::cell`
10929 * `extern mod { ... }` is no longer valid syntax for foreign
10930 function modules. Use extern blocks: `extern { ... }`
10931 * Newtype enums removed. Use tuple-structs.
10932 * Trait implementations no longer support visibility modifiers
10933 * Pattern matching over vectors improved and expanded
10934 * `const` renamed to `static` to correspond to lifetime name,
10935 and make room for future `static mut` unsafe mutable globals.
10936 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10937 * `Clone` implementations can be automatically generated with
10938 `#[deriving(Clone)]`
10939 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10940 instead of `foo as Bar`.
10941 * Fixed length vector types are now written as `[int, .. 3]`
10942 instead of `[int * 3]`.
10943 * Fixed length vector types can express the length as a constant
10944 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10947 * Types with owned pointers or custom destructors move by default,
10948 eliminating the `move` keyword
10949 * All foreign functions are considered unsafe
10950 * &mut is now unaliasable
10951 * Writes to borrowed @mut pointers are prevented dynamically
10953 * The name of the main function can be customized using #[main]
10954 * The default type of an inferred closure is &fn instead of @fn
10955 * `use` statements may no longer be "chained" - they cannot import
10956 identifiers imported by previous `use` statements
10957 * `use` statements are crate relative, importing from the "top"
10958 of the crate by default. Paths may be prefixed with `super::`
10959 or `self::` to change the search behavior.
10960 * Method visibility is inherited from the implementation declaration
10961 * Structural records have been removed
10962 * Many more types can be used in static items, including enums
10963 'static-lifetime pointers and vectors
10964 * Pattern matching over vectors improved and expanded
10965 * Typechecking of closure types has been overhauled to
10966 improve inference and eliminate unsoundness
10967 * Macros leave scope at the end of modules, unless that module is
10968 tagged with #[macro_escape]
10971 * Added big integers to `std::bigint`
10972 * Removed `core::oldcomm` module
10973 * Added pipe-based `core::comm` module
10974 * Numeric traits have been reorganized under `core::num`
10975 * `vec::slice` finally returns a slice
10976 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10977 * Containers reorganized around traits in `core::container`
10978 * `core::dvec` removed, `~[T]` is a drop-in replacement
10979 * `core::send_map` renamed to `core::hashmap`
10980 * `std::map` removed; replaced with `core::hashmap`
10981 * `std::treemap` reimplemented as an owned balanced tree
10982 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10983 * `core::trie` added as a fast ordered map for integer keys
10984 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10985 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10986 overload the comparison operators, whereas `TotalOrd` is used
10987 by certain container types
10990 * Replaced the 'cargo' package manager with 'rustpkg'
10991 * Added all-purpose 'rust' tool
10992 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10993 * rustc now *attempts* to offer spelling suggestions
10994 * Improved support for ARM and Android
10995 * Preliminary MIPS backend
10996 * Improved foreign function ABI implementation for x86, x86_64
10997 * Various memory usage improvements
10998 * Rust code may be embedded in foreign code under limited circumstances
10999 * Inline assembler supported by new asm!() syntax extension.
11002 Version 0.5 (2012-12-21)
11003 ===========================
11005 * ~900 changes, numerous bugfixes
11008 * Removed `<-` move operator
11009 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11010 * Removed old fixed length vector syntax - `[T]/N`
11011 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11012 * Macros may now expand to items and statements
11013 * `a.b()` is always parsed as a method call, never as a field projection
11014 * `Eq` and `IterBytes` implementations can be automatically generated
11015 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11016 * Removed the special crate language for `.rc` files
11017 * Function arguments may consist of any irrefutable pattern
11020 * `&` and `~` pointers may point to objects
11021 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11022 * Enum variants may be structs
11023 * Destructors can be added to all nominal types with the Drop trait
11024 * Structs and nullary enum variants may be constants
11025 * Values that cannot be implicitly copied are now automatically moved
11026 without writing `move` explicitly
11027 * `&T` may now be coerced to `*T`
11028 * Coercions happen in `let` statements as well as function calls
11029 * `use` statements now take crate-relative paths
11030 * The module and type namespaces have been merged so that static
11031 method names can be resolved under the trait in which they are
11034 * Improved support for language features
11035 * Trait inheritance works in many scenarios
11036 * More support for explicit self arguments in methods - `self`, `&self`
11037 `@self`, and `~self` all generally work as expected
11038 * Static methods work in more situations
11039 * Experimental: Traits may declare default methods for the implementations
11043 * New condition handling system in `core::condition`
11044 * Timsort added to `std::sort`
11045 * New priority queue, `std::priority_queue`
11046 * Pipes for serializable types, `std::flatpipes'
11047 * Serialization overhauled to be trait-based
11048 * Expanded `getopts` definitions
11049 * Moved futures to `std`
11050 * More functions are pure now
11051 * `core::comm` renamed to `oldcomm`. Still deprecated
11052 * `rustdoc` and `cargo` are libraries now
11055 * Added a preliminary REPL, `rusti`
11056 * License changed from MIT to dual MIT/APL2
11059 Version 0.4 (2012-10-15)
11060 ==========================
11062 * ~2000 changes, numerous bugfixes
11065 * All keywords are now strict and may not be used as identifiers anywhere
11066 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11067 'of', 'with', 'to', 'class'.
11068 * Classes are replaced with simpler structs
11069 * Explicit method self types
11070 * `ret` became `return` and `alt` became `match`
11071 * `import` is now `use`; `use is now `extern mod`
11072 * `extern mod { ... }` is now `extern { ... }`
11073 * `use mod` is the recommended way to import modules
11074 * `pub` and `priv` replace deprecated export lists
11075 * The syntax of `match` pattern arms now uses fat arrow (=>)
11076 * `main` no longer accepts an args vector; use `os::args` instead
11079 * Trait implementations are now coherent, ala Haskell typeclasses
11080 * Trait methods may be static
11081 * Argument modes are deprecated
11082 * Borrowed pointers are much more mature and recommended for use
11083 * Strings and vectors in the static region are stored in constant memory
11084 * Typestate was removed
11085 * Resolution rewritten to be more reliable
11086 * Support for 'dual-mode' data structures (freezing and thawing)
11089 * Most binary operators can now be overloaded via the traits in
11091 * `std::net::url` for representing URLs
11092 * Sendable hash maps in `core::send_map`
11093 * `core::task' gained a (currently unsafe) task-local storage API
11096 * An efficient new intertask communication primitive called the pipe,
11097 along with a number of higher-level channel types, in `core::pipes`
11098 * `std::arc`, an atomically reference counted, immutable, shared memory
11100 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11101 * Futures are now based on pipes and sendable
11102 * More robust linked task failure
11103 * Improved task builder API
11106 * Improved error reporting
11107 * Preliminary JIT support
11108 * Preliminary work on precise GC
11109 * Extensive architectural improvements to rustc
11110 * Begun a transition away from buggy C++-based reflection (shape) code to
11111 Rust-based (visitor) code
11112 * All hash functions and tables converted to secure, randomized SipHash
11115 Version 0.3 (2012-07-12)
11116 ========================
11118 * ~1900 changes, numerous bugfixes
11120 * New coding conveniences
11121 * Integer-literal suffix inference
11122 * Per-item control over warnings, errors
11123 * #[cfg(windows)] and #[cfg(unix)] attributes
11124 * Documentation comments
11125 * More compact closure syntax
11126 * 'do' expressions for treating higher-order functions as
11128 * *-patterns (wildcard extended to all constructor fields)
11131 * Name resolution pass and exhaustiveness checker rewritten
11132 * Region pointers and borrow checking supersede alias
11134 * Init-ness checking is now provided by a region-based liveness
11135 pass instead of the typestate pass; same for last-use analysis
11136 * Extensive work on region pointers
11138 * Experimental new language features
11139 * Slices and fixed-size, interior-allocated vectors
11140 * #!-comments for lang versioning, shell execution
11141 * Destructors and iface implementation for classes;
11142 type-parameterized classes and class methods
11143 * 'const' type kind for types that can be used to implement
11144 shared-memory concurrency patterns
11148 * Removal of various obsolete features
11149 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11150 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11152 * Constructs: do-while loops ('do' repurposed), fn binding,
11153 resources (replaced by destructors)
11155 * Compiler reorganization
11156 * Syntax-layer of compiler split into separate crate
11157 * Clang (from LLVM project) integrated into build
11158 * Typechecker split into sub-modules
11161 * New time functions
11162 * Extension methods for many built-in types
11163 * Arc: atomic-refcount read-only / exclusive-use shared cells
11164 * Par: parallel map and search routines
11165 * Extensive work on libuv interface
11166 * Much vector code moved to libraries
11167 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11168 #include, #include_str, #include_bin
11170 * Tool improvements
11171 * Cargo automatically resolves dependencies
11174 Version 0.2 (2012-03-29)
11175 =========================
11177 * >1500 changes, numerous bugfixes
11179 * New docs and doc tooling
11181 * New port: FreeBSD x86_64
11183 * Compilation model enhancements
11184 * Generics now specialized, multiply instantiated
11185 * Functions now inlined across separate crates
11187 * Scheduling, stack and threading fixes
11188 * Noticeably improved message-passing performance
11189 * Explicit schedulers
11193 * Experimental new language features
11194 * Operator overloading
11198 * Various language extensions
11199 * C-callback function types: 'crust fn ...'
11200 * Infinite-loop construct: 'loop { ... }'
11201 * Shorten 'mutable' to 'mut'
11202 * Required mutable-local qualifier: 'let mut ...'
11203 * Basic glob-exporting: 'export foo::*;'
11204 * Alt now exhaustive, 'alt check' for runtime-checked
11205 * Block-function form of 'for' loop, with 'break' and 'ret'.
11208 * AST quasi-quote syntax extension
11209 * Revived libuv interface
11210 * New modules: core::{future, iter}, std::arena
11211 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11212 * Extensive cleanup, regularization in libstd, libcore
11215 Version 0.1 (2012-01-20)
11216 ===============================
11218 * Most language features work, including:
11219 * Unique pointers, unique closures, move semantics
11220 * Interface-constrained generics
11221 * Static interface dispatch
11223 * Multithread task scheduling
11224 * Typestate predicates
11225 * Failure unwinding, destructors
11226 * Pattern matching and destructuring assignment
11227 * Lightweight block-lambda syntax
11228 * Preliminary macro-by-example
11230 * Compiler works with the following configurations:
11231 * Linux: x86 and x86_64 hosts and targets
11232 * macOS: x86 and x86_64 hosts and targets
11233 * Windows: x86 hosts and targets
11235 * Cross compilation / multi-target configuration supported.
11237 * Preliminary API-documentation and package-management tools included.
11241 * Documentation is incomplete.
11243 * Performance is below intended target.
11245 * Standard library APIs are subject to extensive change, reorganization.
11247 * Language-level versioning is not yet operational - future code will
11248 break unexpectedly.