1 Version 1.60.0 (2022-04-07)
2 ==========================
6 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
7 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
11 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
12 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
13 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
14 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
15 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
16 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
17 - [Fix invalid removal of newlines from doc comments][92357]
18 - [Add kernel target for RustyHermit][92670]
19 - [Deny mixing bin crate type with lib crate types][92933]
20 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
21 - [Upgrade to LLVM 14][93577]
23 \* Refer to Rust's [platform support page][platform-support-doc] for more
24 information on Rust's tiered platform support.
28 - [Guarantee call order for `sort_by_cached_key`][89621]
29 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
30 - [Make `Instant::{duration_since, elapsed, sub}` saturating and remove workarounds][89926]
31 - [Change PhantomData type for `BuildHasherDefault` (and more)][92630]
35 - [`Arc::new_cyclic`][arc_new_cyclic]
36 - [`Rc::new_cyclic`][rc_new_cyclic]
37 - [`slice::EscapeAscii`][slice_escape_ascii]
38 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
39 - [`u8::escape_ascii`][u8_escape_ascii]
40 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
41 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
42 - [`MaybeUninit::assume_init_read`][assume_init_read]
43 - [`i8::abs_diff`][i8_abs_diff]
44 - [`i16::abs_diff`][i16_abs_diff]
45 - [`i32::abs_diff`][i32_abs_diff]
46 - [`i64::abs_diff`][i64_abs_diff]
47 - [`i128::abs_diff`][i128_abs_diff]
48 - [`isize::abs_diff`][isize_abs_diff]
49 - [`u8::abs_diff`][u8_abs_diff]
50 - [`u16::abs_diff`][u16_abs_diff]
51 - [`u32::abs_diff`][u32_abs_diff]
52 - [`u64::abs_diff`][u64_abs_diff]
53 - [`u128::abs_diff`][u128_abs_diff]
54 - [`usize::abs_diff`][usize_abs_diff]
55 - [`Display for io::ErrorKind`][display_error_kind]
56 - [`From<u8> for ExitCode`][from_u8_exit_code]
57 - [`Not for !` (the "never" type)][not_never]
58 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
59 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
63 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
64 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
65 - [Stabilize namespaced and weak dependency features.][cargo/10269]
66 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
67 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
71 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
72 - [Drop rustc-docs from complete profile][93742]
73 - [bootstrap: tidy up flag handling for llvm build][93918]
77 - [Remove compiler-rt linking hack on Android][83822]
78 - In a future release we're planning to increase the baseline requirements for
79 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
80 your feedback in [PR #95026][95026].
85 These changes provide no direct user facing benefits, but represent significant
86 improvements to the internals and overall performance of rustc
89 - [Switch all libraries to the 2021 edition][92068]
91 [83822]: https://github.com/rust-lang/rust/pull/83822
92 [86374]: https://github.com/rust-lang/rust/pull/86374
93 [87487]: https://github.com/rust-lang/rust/pull/87487
94 [89621]: https://github.com/rust-lang/rust/pull/89621
95 [89926]: https://github.com/rust-lang/rust/pull/89926
96 [90132]: https://github.com/rust-lang/rust/pull/90132
97 [90247]: https://github.com/rust-lang/rust/pull/90247
98 [91606]: https://github.com/rust-lang/rust/pull/91606
99 [92068]: https://github.com/rust-lang/rust/pull/92068
100 [92300]: https://github.com/rust-lang/rust/pull/92300
101 [92357]: https://github.com/rust-lang/rust/pull/92357
102 [92383]: https://github.com/rust-lang/rust/pull/92383
103 [92630]: https://github.com/rust-lang/rust/pull/92630
104 [92670]: https://github.com/rust-lang/rust/pull/92670
105 [92800]: https://github.com/rust-lang/rust/pull/92800
106 [92933]: https://github.com/rust-lang/rust/pull/92933
107 [93566]: https://github.com/rust-lang/rust/pull/93566
108 [93577]: https://github.com/rust-lang/rust/pull/93577
109 [93658]: https://github.com/rust-lang/rust/pull/93658
110 [93742]: https://github.com/rust-lang/rust/pull/93742
111 [93824]: https://github.com/rust-lang/rust/pull/93824
112 [93918]: https://github.com/rust-lang/rust/pull/93918
113 [95026]: https://github.com/rust-lang/rust/pull/95026
115 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
116 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
117 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
118 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
119 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
121 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
122 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
123 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
124 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
125 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
126 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
127 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
128 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
129 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
130 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
131 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
132 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
133 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
134 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
135 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
136 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
137 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
138 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
139 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
140 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
141 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
142 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
143 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
144 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
145 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
147 Version 1.59.0 (2022-02-24)
148 ==========================
153 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
154 - [Stabilize destructuring assignment][90521]
155 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
156 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
161 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
162 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
163 - [Fix sparc64 ABI for aggregates with floating point members][91003]
164 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
165 - [Add support for riscv64gc-unknown-freebsd][91284]
166 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
167 - [Soft disable incremental compilation][94124]
169 This release disables incremental compilation, unless the user has explicitly
170 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
171 This is due to a known and relatively frequently occurring bug in incremental
172 compilation, which causes builds to issue internal compiler errors. This
173 particular bug is already fixed on nightly, but that fix has not yet rolled out
174 to stable and is deemed too risky for a direct stable backport.
176 As always, we encourage users to test with nightly and report bugs so that we
177 can track failures and fix issues earlier.
179 See [94124] for more details.
181 [94124]: https://github.com/rust-lang/rust/issues/94124
186 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
191 - [`std::thread::available_parallelism`][available_parallelism]
192 - [`Result::copied`][result-copied]
193 - [`Result::cloned`][result-cloned]
194 - [`arch::asm!`][asm]
195 - [`arch::global_asm!`][global_asm]
196 - [`ops::ControlFlow::is_break`][is_break]
197 - [`ops::ControlFlow::is_continue`][is_continue]
198 - [`TryFrom<char> for u8`][try_from_char_u8]
199 - [`char::TryFromCharError`][try_from_char_err]
200 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
202 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
203 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
204 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
205 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
206 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
207 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
208 - [`DoubleEndedIterator for ToLowercase`][lowercase]
209 - [`DoubleEndedIterator for ToUppercase`][uppercase]
210 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
211 - [`UnwindSafe for Once`][unwindsafe_once]
212 - [`RefUnwindSafe for Once`][refunwindsafe_once]
213 - [armv8 neon intrinsics for aarch64][stdarch/1266]
217 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
218 - [`mem::MaybeUninit::assume_init`][muninit_init]
219 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
220 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
225 - [Stabilize the `strip` profile option][cargo/10088]
226 - [Stabilize future-incompat-report][cargo/10165]
227 - [Support abbreviating `--release` as `-r`][cargo/10133]
228 - [Support `term.quiet` configuration][cargo/10152]
229 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
234 - [Refactor weak symbols in std::sys::unix][90846]
235 This may add new, versioned, symbols when building with a newer glibc, as the
236 standard library uses weak linkage rather than dynamically attempting to load
237 certain symbols at runtime.
238 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
239 This adds a future compatibility lint to supporting the use of cfg_attr
240 wrapping either crate_type or crate_name specification within Rust files;
241 it is recommended that users migrate to setting the equivalent command line
243 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
244 This may expose new names, leading to conflicts with preexisting names in a
245 given namespace and a compilation failure.
246 - [Cargo will document libraries before binaries.][cargo/10172]
247 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
248 - [Weaken guarantee around advancing underlying iterators in zip][83791]
249 - [Make split_inclusive() on an empty slice yield an empty output][89825]
250 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
251 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
256 These changes provide no direct user facing benefits, but represent significant
257 improvements to the internals and overall performance of rustc
260 - [Fix many cases of normalization-related ICEs][91255]
261 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
262 - [Store liveness in interval sets for region inference][90637]
264 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
265 unstable feature.][91867]
267 [91867]: https://github.com/rust-lang/rust/issues/91867
268 [83744]: https://github.com/rust-lang/rust/pull/83744/
269 [83791]: https://github.com/rust-lang/rust/pull/83791/
270 [85013]: https://github.com/rust-lang/rust/pull/85013/
271 [89825]: https://github.com/rust-lang/rust/pull/89825/
272 [89999]: https://github.com/rust-lang/rust/pull/89999/
273 [90128]: https://github.com/rust-lang/rust/pull/90128/
274 [90207]: https://github.com/rust-lang/rust/pull/90207/
275 [90521]: https://github.com/rust-lang/rust/pull/90521/
276 [90586]: https://github.com/rust-lang/rust/pull/90586/
277 [90637]: https://github.com/rust-lang/rust/pull/90637/
278 [90833]: https://github.com/rust-lang/rust/pull/90833/
279 [90846]: https://github.com/rust-lang/rust/pull/90846/
280 [91003]: https://github.com/rust-lang/rust/pull/91003/
281 [91172]: https://github.com/rust-lang/rust/pull/91172/
282 [91255]: https://github.com/rust-lang/rust/pull/91255/
283 [91284]: https://github.com/rust-lang/rust/pull/91284/
284 [91535]: https://github.com/rust-lang/rust/pull/91535/
285 [91593]: https://github.com/rust-lang/rust/pull/91593/
286 [91728]: https://github.com/rust-lang/rust/pull/91728/
287 [91878]: https://github.com/rust-lang/rust/pull/91878/
288 [91896]: https://github.com/rust-lang/rust/pull/91896/
289 [91926]: https://github.com/rust-lang/rust/pull/91926/
290 [91984]: https://github.com/rust-lang/rust/pull/91984/
291 [92020]: https://github.com/rust-lang/rust/pull/92020/
292 [92034]: https://github.com/rust-lang/rust/pull/92034/
293 [92137]: https://github.com/rust-lang/rust/pull/92137/
294 [92483]: https://github.com/rust-lang/rust/pull/92483/
295 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
296 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
297 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
298 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
299 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
300 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
301 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
302 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
304 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
305 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
306 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
307 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
308 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
309 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
310 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
311 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
312 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
313 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
314 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
315 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
316 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
317 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
318 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
319 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
320 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
321 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
322 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
323 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
324 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
325 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
326 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
327 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
328 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
329 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
331 Version 1.58.1 (2022-01-19)
332 ===========================
334 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
335 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
336 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
337 * [Fix wrong error message displayed when some imports are missing][91254]
338 * [Fix rustfmt not formatting generated files from stdin][92912]
340 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
341 [91254]: https://github.com/rust-lang/rust/pull/91254
342 [92912]: https://github.com/rust-lang/rust/pull/92912
343 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
344 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
346 Version 1.58.0 (2022-01-13)
347 ==========================
352 - [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.
353 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
354 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
359 - [Add LLVM CFI support to the Rust compiler][89652]
360 - [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.
361 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
362 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
363 - [Update the minimum external LLVM to 12][90175]
364 - [Add `x86_64-unknown-none` at Tier 3*][89062]
365 - [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.
366 - [Don't abort compilation after giving a lint error][87337]
367 - [Error messages point at the source of trait bound obligations in more places][89580]
369 \* Refer to Rust's [platform support page][platform-support-doc] for more
370 information on Rust's tiered platform support.
375 - [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.
376 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
377 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
378 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
379 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
380 - [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).
385 - [`Metadata::is_symlink`]
386 - [`Path::is_symlink`]
387 - [`{integer}::saturating_div`]
388 - [`Option::unwrap_unchecked`]
389 - [`Result::unwrap_unchecked`]
390 - [`Result::unwrap_err_unchecked`]
393 These APIs are now usable in const contexts:
396 - [`Duration::checked_add`]
397 - [`Duration::saturating_add`]
398 - [`Duration::checked_sub`]
399 - [`Duration::saturating_sub`]
400 - [`Duration::checked_mul`]
401 - [`Duration::saturating_mul`]
402 - [`Duration::checked_div`]
407 - [Add --message-format for install command][cargo/10107]
408 - [Warn when alias shadows external subcommand][cargo/10082]
413 - [Show all Deref implementations recursively in rustdoc][90183]
414 - [Use computed visibility in rustdoc][88447]
419 - [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.
420 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
421 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
422 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
423 - [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.
424 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
429 These changes provide no direct user facing benefits, but represent significant
430 improvements to the internals and overall performance of rustc
433 - [Implement coherence checks for negative trait impls][90104]
434 - [Add rustc lint, warning when iterating over hashmaps][89558]
435 - [Optimize live point computation][90491]
436 - [Enable verification for 1/32nd of queries loaded from disk][90361]
437 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
439 [87337]: https://github.com/rust-lang/rust/pull/87337/
440 [87467]: https://github.com/rust-lang/rust/pull/87467/
441 [87704]: https://github.com/rust-lang/rust/pull/87704/
442 [88041]: https://github.com/rust-lang/rust/pull/88041/
443 [88447]: https://github.com/rust-lang/rust/pull/88447/
444 [88601]: https://github.com/rust-lang/rust/pull/88601/
445 [89062]: https://github.com/rust-lang/rust/pull/89062/
446 [89174]: https://github.com/rust-lang/rust/pull/89174/
447 [89551]: https://github.com/rust-lang/rust/pull/89551/
448 [89558]: https://github.com/rust-lang/rust/pull/89558/
449 [89580]: https://github.com/rust-lang/rust/pull/89580/
450 [89652]: https://github.com/rust-lang/rust/pull/89652/
451 [90041]: https://github.com/rust-lang/rust/pull/90041/
452 [90058]: https://github.com/rust-lang/rust/pull/90058/
453 [90104]: https://github.com/rust-lang/rust/pull/90104/
454 [90117]: https://github.com/rust-lang/rust/pull/90117/
455 [90175]: https://github.com/rust-lang/rust/pull/90175/
456 [90183]: https://github.com/rust-lang/rust/pull/90183/
457 [90297]: https://github.com/rust-lang/rust/pull/90297/
458 [90329]: https://github.com/rust-lang/rust/pull/90329/
459 [90361]: https://github.com/rust-lang/rust/pull/90361/
460 [90417]: https://github.com/rust-lang/rust/pull/90417/
461 [90473]: https://github.com/rust-lang/rust/pull/90473/
462 [90491]: https://github.com/rust-lang/rust/pull/90491/
463 [90733]: https://github.com/rust-lang/rust/pull/90733/
464 [90833]: https://github.com/rust-lang/rust/pull/90833/
465 [90846]: https://github.com/rust-lang/rust/pull/90846/
466 [91026]: https://github.com/rust-lang/rust/pull/91026/
467 [91207]: https://github.com/rust-lang/rust/pull/91207/
468 [91255]: https://github.com/rust-lang/rust/pull/91255/
469 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
470 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
471 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
472 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
473 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
474 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
475 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
476 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
477 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
478 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
480 Version 1.57.0 (2021-12-02)
481 ==========================
486 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
487 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
488 - [Allow panicking in constant evaluation.][89508]
489 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
494 - [Create more accurate debuginfo for vtables.][89597]
495 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
496 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
497 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
498 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
500 \* Refer to Rust's [platform support page][platform-support-doc] for more
501 information on Rust's tiered platform support.
506 - [Avoid allocations and copying in `Vec::leak`][89337]
507 - [Add `#[repr(i8)]` to `Ordering`][89507]
508 - [Optimize `File::read_to_end` and `read_to_string`][89582]
509 - [Update to Unicode 14.0][89614]
510 - [Many more functions are marked `#[must_use]`][89692], producing a warning
511 when ignoring their return value. This helps catch mistakes such as expecting
512 a function to mutate a value in place rather than return a new value.
517 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
518 - [`[T; N]::as_slice`][`array::as_slice`]
519 - [`collections::TryReserveError`]
520 - [`HashMap::try_reserve`]
521 - [`HashSet::try_reserve`]
522 - [`String::try_reserve`]
523 - [`String::try_reserve_exact`]
524 - [`Vec::try_reserve`]
525 - [`Vec::try_reserve_exact`]
526 - [`VecDeque::try_reserve`]
527 - [`VecDeque::try_reserve_exact`]
528 - [`Iterator::map_while`]
530 - [`proc_macro::is_available`]
531 - [`Command::get_program`]
532 - [`Command::get_args`]
533 - [`Command::get_envs`]
534 - [`Command::get_current_dir`]
538 These APIs are now usable in const contexts:
540 - [`hint::unreachable_unchecked`]
545 - [Stabilize custom profiles][cargo/9943]
550 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
551 This will break some builds that set `#![deny(dead_code)]`.
555 These changes provide no direct user facing benefits, but represent significant
556 improvements to the internals and overall performance of rustc
559 - [Added an experimental backend for codegen with `libgccjit`.][87260]
561 [85200]: https://github.com/rust-lang/rust/pull/85200/
562 [86191]: https://github.com/rust-lang/rust/pull/86191/
563 [87220]: https://github.com/rust-lang/rust/pull/87220/
564 [87260]: https://github.com/rust-lang/rust/pull/87260/
565 [88321]: https://github.com/rust-lang/rust/pull/88321/
566 [88529]: https://github.com/rust-lang/rust/pull/88529/
567 [88690]: https://github.com/rust-lang/rust/pull/88690/
568 [88952]: https://github.com/rust-lang/rust/pull/88952/
569 [89337]: https://github.com/rust-lang/rust/pull/89337/
570 [89507]: https://github.com/rust-lang/rust/pull/89507/
571 [89508]: https://github.com/rust-lang/rust/pull/89508/
572 [89582]: https://github.com/rust-lang/rust/pull/89582/
573 [89597]: https://github.com/rust-lang/rust/pull/89597/
574 [89614]: https://github.com/rust-lang/rust/pull/89614/
575 [89692]: https://github.com/rust-lang/rust/issues/89692/
576 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
577 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
578 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
579 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
580 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
581 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
582 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
583 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
584 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
585 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
586 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
587 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
588 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
589 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
590 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
591 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
592 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
593 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
594 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
595 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
596 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
598 Version 1.56.1 (2021-11-01)
599 ===========================
601 - New lints to detect the presence of bidirectional-override Unicode
602 codepoints in the compiled source code ([CVE-2021-42574])
604 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
606 Version 1.56.0 (2021-10-21)
607 ========================
612 - [The 2021 Edition is now stable.][rust#88100]
613 See [the edition guide][rust-2021-edition-guide] for more details.
614 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
615 - [Union field access is permitted in `const fn`.][rust#85769]
617 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
622 - [Upgrade to LLVM 13.][rust#87570]
623 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
624 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
625 - [Warnings can be forced on with `--force-warn`.][rust#87472]
626 This feature is primarily intended for usage by `cargo fix`, rather than end users.
627 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
628 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
629 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
631 \* Refer to Rust's [platform support page][platform-support-doc] for more
632 information on Rust's tiered platform support.
637 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
638 The Windows console still requires valid Unicode, but this change allows
639 splitting a UTF-8 character across multiple write calls. This allows, for
640 instance, programs that just read and write data buffers (e.g. copying a file
641 to stdout) without regard for Unicode or character boundaries.
642 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
643 For this use case, atomics scale much better under contention.
644 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
645 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
646 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
647 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
648 - [Treat invalid environment variable names as non-existent.][rust#86183]
649 Previously, the environment functions would panic if given a variable name
650 with an internal null character or equal sign (`=`). Now, these functions will
651 just treat such names as non-existent variables, since the OS cannot represent
652 the existence of a variable with such a name.
657 - [`std::os::unix::fs::chroot`]
658 - [`UnsafeCell::raw_get`]
659 - [`BufWriter::into_parts`]
660 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
661 These APIs were previously stable in `std`, but are now also available in `core`.
663 - [`String::shrink_to`]
664 - [`OsString::shrink_to`]
665 - [`PathBuf::shrink_to`]
666 - [`BinaryHeap::shrink_to`]
667 - [`VecDeque::shrink_to`]
668 - [`HashMap::shrink_to`]
669 - [`HashSet::shrink_to`]
671 These APIs are now usable in const contexts:
673 - [`std::mem::transmute`]
674 - [`[T]::first`][`slice::first`]
675 - [`[T]::split_first`][`slice::split_first`]
676 - [`[T]::last`][`slice::last`]
677 - [`[T]::split_last`][`slice::split_last`]
682 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
683 This has no effect at present on dependency version selection.
684 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
685 that support Rust code to include a crate's specified minimum version in the test matrix for that
691 - [Update to new argument parsing rules on Windows.][rust#87580]
692 This adjusts Rust's standard library to match the behavior of the standard
693 libraries for C/C++. The rules have changed slightly over time, and this PR
694 brings us to the latest set of rules (changed in 2008).
695 - [Disallow the aapcs calling convention on aarch64][rust#88399]
696 This was already not supported by LLVM; this change surfaces this lack of
697 support with a better error message.
698 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
699 - [Warn when an escaped newline skips multiple lines.][rust#87671]
700 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
701 may return different values on glibc <= 2.24.][rust#81825]
702 Rust now invokes the `clone3` system call directly, when available, to use new functionality
703 available via that system call. Older versions of glibc cache the result of `getpid`, and only
704 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
705 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
709 These changes provide no direct user facing benefits, but represent significant
710 improvements to the internals and overall performance of rustc
713 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
714 This improves the performance of most Rust builds.
715 - [Unify representation of macros in internal data structures.][rust#88019]
716 This change fixes a host of bugs with the handling of macros by the compiler,
719 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
720 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
721 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
722 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
723 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
724 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
725 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
726 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
727 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
728 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
729 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
730 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
731 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
732 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
733 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
734 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
735 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
736 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
737 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
738 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
739 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
740 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
741 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
742 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
743 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
744 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
745 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
746 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
747 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
748 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
749 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
750 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
751 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
752 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
753 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
754 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
755 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
756 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
757 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
758 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
759 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
760 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
762 Version 1.55.0 (2021-09-09)
763 ============================
767 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
768 will end at the maximum value of the integer.][83918]
769 - [You can now explicitly import the prelude of different editions
770 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
774 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
776 \* Refer to Rust's [platform support page][platform-support-doc] for more
777 information on Rust's tiered platform support.
782 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
783 These improvements should in general provide faster string parsing of floats,
784 no longer reject certain valid floating point values, and reduce
785 the produced code size for non-stripped artifacts.
786 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
793 - [`IntoInnerError::into_error`]
794 - [`IntoInnerError::into_parts`]
795 - [`MaybeUninit::assume_init_mut`]
796 - [`MaybeUninit::assume_init_ref`]
797 - [`MaybeUninit::write`]
799 - [`ops::ControlFlow`]
801 - [`x86::_bittestandcomplement`]
802 - [`x86::_bittestandreset`]
803 - [`x86::_bittestandset`]
804 - [`x86_64::_bittest64`]
805 - [`x86_64::_bittestandcomplement64`]
806 - [`x86_64::_bittestandreset64`]
807 - [`x86_64::_bittestandset64`]
809 The following previously stable functions are now `const`.
811 - [`str::from_utf8_unchecked`]
816 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
817 rustc in parallel such as when using `cargo test`.][cargo/9675]
818 - [The package definition in `cargo metadata` now includes the `"default_run"`
819 field from the manifest.][cargo/9550]
820 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
821 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
822 of packages.][cargo/9663]
826 - [Added "Go to item on exact match" search option.][85876]
827 - [The "Implementors" section on traits no longer shows redundant
828 method definitions.][85970]
829 - [Trait implementations are toggled open by default.][86260] This should make the
830 implementations more searchable by tools like `CTRL+F` in your browser.
831 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
832 through type aliases.][86334]
833 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
834 "Trait Implementations" section.][86513]
839 - [std functions that return an `io::Error` will no longer use the
840 `ErrorKind::Other` variant.][85746] This is to better reflect that these
841 kinds of errors could be categorised [into newer more specific `ErrorKind`
842 variants][79965], and that they do not represent a user error.
843 - [Using environment variable names with `process::Command` on Windows now
844 behaves as expected.][85270] Previously using envionment variables with
845 `Command` would cause them to be ASCII-uppercased.
846 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
847 with `rustdoc::`][86849]
848 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
849 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
850 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
853 [86849]: https://github.com/rust-lang/rust/pull/86849
854 [86513]: https://github.com/rust-lang/rust/pull/86513
855 [86334]: https://github.com/rust-lang/rust/pull/86334
856 [86260]: https://github.com/rust-lang/rust/pull/86260
857 [85970]: https://github.com/rust-lang/rust/pull/85970
858 [85876]: https://github.com/rust-lang/rust/pull/85876
859 [83572]: https://github.com/rust-lang/rust/pull/83572
860 [86294]: https://github.com/rust-lang/rust/pull/86294
861 [86858]: https://github.com/rust-lang/rust/pull/86858
862 [86761]: https://github.com/rust-lang/rust/pull/86761
863 [85746]: https://github.com/rust-lang/rust/pull/85746
864 [85270]: https://github.com/rust-lang/rust/pull/85270
865 [83918]: https://github.com/rust-lang/rust/pull/83918
866 [79965]: https://github.com/rust-lang/rust/pull/79965
867 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
868 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
869 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
870 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
871 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
872 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
873 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
874 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
875 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
876 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
877 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
878 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
879 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
880 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
881 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
882 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
883 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
884 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
885 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
886 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
887 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
888 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
891 Version 1.54.0 (2021-07-29)
892 ============================
895 -----------------------
897 - [You can now use macros for values in some built-in attributes.][83366]
898 This primarily allows you to call macros within the `#[doc]` attribute. For
899 example, to include external documentation in your crate, you can now write
902 #![doc = include_str!("README.md")]
905 - [You can now cast between unsized slice types (and types which contain
906 unsized slices) in `const fn`.][85078]
907 - [You can now use multiple generic lifetimes with `impl Trait` where the
908 lifetimes don't explicitly outlive another.][84701] In code this means
909 that you can now have `impl Trait<'a, 'b>` where as before you could
910 only have `impl Trait<'a, 'b> where 'b: 'a`.
913 -----------------------
915 - [Rustc will now search for custom JSON targets in
916 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
917 directory.][83800] You can find your sysroot directory by running
918 `rustc --print sysroot`.
919 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
920 - [You can now use `#[target_feature]` on safe functions when targeting
921 WebAssembly platforms.][84988]
922 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
923 - [Added tier 3\* support for `bpfel-unknown-none`
924 and `bpfeb-unknown-none`.][79608]
925 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
927 \* Refer to Rust's [platform support page][platform-support-doc] for more
928 information on Rust's tiered platform support.
931 -----------------------
933 - [`panic::panic_any` will now `#[track_caller]`.][85745]
934 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
935 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
936 - [The implementations of vendor intrinsics in core::arch have been
937 significantly refactored.][83278] The main user-visible changes are
938 a 50% reduction in the size of libcore.rlib and stricter validation
939 of constant operands passed to intrinsics. The latter is technically
940 a breaking change, but allows Rust to more closely match the C vendor
946 - [`BTreeMap::into_keys`]
947 - [`BTreeMap::into_values`]
948 - [`HashMap::into_keys`]
949 - [`HashMap::into_values`]
951 - [`VecDeque::binary_search`]
952 - [`VecDeque::binary_search_by`]
953 - [`VecDeque::binary_search_by_key`]
954 - [`VecDeque::partition_point`]
959 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
960 the dependency graph.][cargo/9520]
961 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
962 in the tree ][cargo/9499]
963 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
964 macro dependencies.][cargo/9488]
965 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
966 This variable points to a directory that integration tests and benches
967 can use as a "scratchpad" for testing filesystem operations.
971 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
972 - [Previously unsound code is no longer permitted where different constructors in branches
973 could require different lifetimes.][85574]
974 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
975 than before and may reject some previously accepted code.
976 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
977 when compiled with `codegen-units = 1`.][86063]
979 [85574]: https://github.com/rust-lang/rust/issues/85574
980 [86831]: https://github.com/rust-lang/rust/issues/86831
981 [86063]: https://github.com/rust-lang/rust/issues/86063
982 [79608]: https://github.com/rust-lang/rust/pull/79608
983 [84988]: https://github.com/rust-lang/rust/pull/84988
984 [84701]: https://github.com/rust-lang/rust/pull/84701
985 [84072]: https://github.com/rust-lang/rust/pull/84072
986 [85745]: https://github.com/rust-lang/rust/pull/85745
987 [84744]: https://github.com/rust-lang/rust/pull/84744
988 [85078]: https://github.com/rust-lang/rust/pull/85078
989 [84717]: https://github.com/rust-lang/rust/pull/84717
990 [83800]: https://github.com/rust-lang/rust/pull/83800
991 [83366]: https://github.com/rust-lang/rust/pull/83366
992 [83278]: https://github.com/rust-lang/rust/pull/83278
993 [85292]: https://github.com/rust-lang/rust/pull/85292
994 [82834]: https://github.com/rust-lang/rust/pull/82834
995 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
996 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
997 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
998 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
999 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1000 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1001 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1002 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1003 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1004 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1005 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1007 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1009 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1011 Version 1.53.0 (2021-06-17)
1012 ============================
1015 -----------------------
1016 - [You can now use unicode for identifiers.][83799] This allows multilingual
1017 identifiers but still doesn't allow glyphs that are not considered characters
1018 such as `◆` or `🦀`. More specifically you can now use any identifier that
1019 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1020 is the same standard as languages like Python, however Rust uses NFC
1021 normalization which may be different from other languages.
1022 - [You can now specify "or patterns" inside pattern matches.][79278]
1023 Previously you could only use `|` (OR) on complete patterns. E.g.
1027 matches!(x, Some(1) | Some(2));
1029 matches!(x, Some(1 | 2));
1031 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1032 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1033 to change semantics to being a pattern fragment in a future edition.
1036 -----------------------
1037 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1038 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1039 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1041 \* Refer to Rust's [platform support page][platform-support-doc] for more
1042 information on Rust's tiered platform support.
1045 -----------------------
1046 - [Abort messages will now forward to `android_set_abort_message` on
1047 Android platforms when available.][81469]
1048 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1049 - [Arrays of any length now implement `IntoIterator`.][84147]
1050 Currently calling `.into_iter()` as a method on an array will
1051 return `impl Iterator<Item=&T>`, but this may change in a
1052 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1053 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1054 - [`leading_zeros`, and `trailing_zeros` are now available on all
1055 `NonZero` integer types.][84082]
1056 - [`{f32, f64}::from_str` now parse and print special values
1057 (`NaN`, `-0`) according to IEEE 754.][78618]
1058 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1059 - [Add the `BITS` associated constant to all numeric types.][82565]
1063 - [`AtomicBool::fetch_update`]
1064 - [`AtomicPtr::fetch_update`]
1065 - [`BTreeMap::retain`]
1066 - [`BTreeSet::retain`]
1067 - [`BufReader::seek_relative`]
1068 - [`DebugStruct::non_exhaustive`]
1070 - [`Duration::ZERO`]
1071 - [`Duration::is_zero`]
1072 - [`Duration::saturating_add`]
1073 - [`Duration::saturating_mul`]
1074 - [`Duration::saturating_sub`]
1075 - [`ErrorKind::Unsupported`]
1076 - [`Option::insert`]
1077 - [`Ordering::is_eq`]
1078 - [`Ordering::is_ge`]
1079 - [`Ordering::is_gt`]
1080 - [`Ordering::is_le`]
1081 - [`Ordering::is_lt`]
1082 - [`Ordering::is_ne`]
1083 - [`OsStr::is_ascii`]
1084 - [`OsStr::make_ascii_lowercase`]
1085 - [`OsStr::make_ascii_uppercase`]
1086 - [`OsStr::to_ascii_lowercase`]
1087 - [`OsStr::to_ascii_uppercase`]
1088 - [`Peekable::peek_mut`]
1089 - [`Rc::decrement_strong_count`]
1090 - [`Rc::increment_strong_count`]
1091 - [`Vec::extend_from_within`]
1092 - [`array::from_mut`]
1093 - [`array::from_ref`]
1094 - [`cmp::max_by_key`]
1096 - [`cmp::min_by_key`]
1098 - [`f32::is_subnormal`]
1099 - [`f64::is_subnormal`]
1102 -----------------------
1103 - [Cargo now supports git repositories where the default `HEAD` branch is not
1104 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1105 which can handle default branches correctly.
1106 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1107 - [The `authors` field is no longer included in `Cargo.toml` for new
1108 projects.][cargo/9282]
1111 -----------------------
1112 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1113 without hyperlinks.][81764]
1117 - [Implement token-based handling of attributes during expansion][82608]
1118 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1119 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1120 to confusion and potential security vulnerabilities and [is no
1121 longer recommended][ietf6943].
1122 - [The added `BITS` constant may conflict with external definitions.][85667]
1123 In particular, this was known to be a problem in the `lexical-core` crate,
1124 but they have published fixes for semantic versions 0.4 through 0.7. To
1125 update this dependency alone, use `cargo update -p lexical-core`.
1126 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1130 These changes provide no direct user facing benefits, but represent significant
1131 improvements to the internals and overall performance of rustc and
1134 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1135 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1136 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1137 - [Rework rustdoc const type][82873]
1139 [85667]: https://github.com/rust-lang/rust/pull/85667
1140 [83386]: https://github.com/rust-lang/rust/pull/83386
1141 [82771]: https://github.com/rust-lang/rust/pull/82771
1142 [84147]: https://github.com/rust-lang/rust/pull/84147
1143 [84082]: https://github.com/rust-lang/rust/pull/84082
1144 [83799]: https://github.com/rust-lang/rust/pull/83799
1145 [83681]: https://github.com/rust-lang/rust/pull/83681
1146 [83652]: https://github.com/rust-lang/rust/pull/83652
1147 [83387]: https://github.com/rust-lang/rust/pull/83387
1148 [82873]: https://github.com/rust-lang/rust/pull/82873
1149 [82864]: https://github.com/rust-lang/rust/pull/82864
1150 [82608]: https://github.com/rust-lang/rust/pull/82608
1151 [82565]: https://github.com/rust-lang/rust/pull/82565
1152 [80525]: https://github.com/rust-lang/rust/pull/80525
1153 [79278]: https://github.com/rust-lang/rust/pull/79278
1154 [78618]: https://github.com/rust-lang/rust/pull/78618
1155 [77704]: https://github.com/rust-lang/rust/pull/77704
1156 [83941]: https://github.com/rust-lang/rust/pull/83941
1157 [83065]: https://github.com/rust-lang/rust/pull/83065
1158 [81764]: https://github.com/rust-lang/rust/pull/81764
1159 [81469]: https://github.com/rust-lang/rust/pull/81469
1160 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1161 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1162 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1163 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1164 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1165 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1166 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1167 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1168 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1169 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1170 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1171 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1172 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1173 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1174 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1175 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1176 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1177 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1178 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1179 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1180 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1181 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1182 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1183 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1184 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1185 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1186 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1187 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1188 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1189 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1190 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1191 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1192 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1193 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1194 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1195 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1196 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1197 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1198 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1199 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1200 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1203 Version 1.52.1 (2021-05-10)
1204 ============================
1206 This release disables incremental compilation, unless the user has explicitly
1207 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1209 This is due to the widespread, and frequently occurring, breakage encountered by
1210 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1211 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1212 newly added incremental verification are still present in past stable versions,
1213 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1216 These problems only affect incremental builds, so release builds with Cargo
1217 should not be affected unless the user has explicitly opted into incremental.
1218 Debug and check builds are affected.
1220 See [84970] for more details.
1222 [84970]: https://github.com/rust-lang/rust/issues/84970
1224 Version 1.52.0 (2021-05-06)
1225 ============================
1229 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1230 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1231 is allowed by default, and may become a warning or hard error in a
1233 - [You can now cast mutable references to arrays to a pointer of the same type as
1234 the element.][81479]
1238 - [Upgraded the default LLVM to LLVM 12.][81451]
1240 Added tier 3\* support for the following targets.
1242 - [`s390x-unknown-linux-musl`][82166]
1243 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1244 - [`powerpc-unknown-openbsd`][82733]
1246 \* Refer to Rust's [platform support page][platform-support-doc] for more
1247 information on Rust's tiered platform support.
1251 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1252 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1253 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1254 - [All integer division and remainder operations are now `const`.][80962]
1258 - [`Arguments::as_str`]
1260 - [`char::REPLACEMENT_CHARACTER`]
1261 - [`char::UNICODE_VERSION`]
1262 - [`char::decode_utf16`]
1263 - [`char::from_digit`]
1264 - [`char::from_u32_unchecked`]
1265 - [`char::from_u32`]
1266 - [`slice::partition_point`]
1267 - [`str::rsplit_once`]
1268 - [`str::split_once`]
1270 The following previously stable APIs are now `const`.
1272 - [`char::len_utf8`]
1273 - [`char::len_utf16`]
1274 - [`char::to_ascii_uppercase`]
1275 - [`char::to_ascii_lowercase`]
1276 - [`char::eq_ignore_ascii_case`]
1277 - [`u8::to_ascii_uppercase`]
1278 - [`u8::to_ascii_lowercase`]
1279 - [`u8::eq_ignore_ascii_case`]
1283 - [Rustdoc lints are now treated as a tool lint, meaning that
1284 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1285 Using the old style is still allowed, and will become a warning in
1287 - [Rustdoc now supports argument files.][82261]
1288 - [Rustdoc now generates smart punctuation for documentation.][79423]
1289 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1297 - [You can now pass multiple filters to tests.][81356] E.g.
1298 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1299 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1300 allowing you to see `std` symbols when debugging.][82218]
1304 These changes provide no direct user facing benefits, but represent significant
1305 improvements to the internals and overall performance of rustc and
1308 - [Check the result cache before the DepGraph when ensuring queries][81855]
1309 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1310 - [Only store a LocalDefId in some HIR nodes][81611]
1311 - [Store HIR attributes in a side table][79519]
1315 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1316 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1317 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1318 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1319 languages in code blocks.][78429]
1320 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1321 - [Changes in how proc macros handle whitespace may lead to panics when used
1322 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1323 - [Turn `#[derive]` into a regular macro attribute][79078]
1325 [84136]: https://github.com/rust-lang/rust/issues/84136
1326 [80763]: https://github.com/rust-lang/rust/pull/80763
1327 [82166]: https://github.com/rust-lang/rust/pull/82166
1328 [82121]: https://github.com/rust-lang/rust/pull/82121
1329 [81879]: https://github.com/rust-lang/rust/pull/81879
1330 [82261]: https://github.com/rust-lang/rust/pull/82261
1331 [82218]: https://github.com/rust-lang/rust/pull/82218
1332 [82216]: https://github.com/rust-lang/rust/pull/82216
1333 [82202]: https://github.com/rust-lang/rust/pull/82202
1334 [81855]: https://github.com/rust-lang/rust/pull/81855
1335 [81766]: https://github.com/rust-lang/rust/pull/81766
1336 [81744]: https://github.com/rust-lang/rust/pull/81744
1337 [81611]: https://github.com/rust-lang/rust/pull/81611
1338 [81479]: https://github.com/rust-lang/rust/pull/81479
1339 [81451]: https://github.com/rust-lang/rust/pull/81451
1340 [81356]: https://github.com/rust-lang/rust/pull/81356
1341 [80962]: https://github.com/rust-lang/rust/pull/80962
1342 [80553]: https://github.com/rust-lang/rust/pull/80553
1343 [80527]: https://github.com/rust-lang/rust/pull/80527
1344 [79519]: https://github.com/rust-lang/rust/pull/79519
1345 [79423]: https://github.com/rust-lang/rust/pull/79423
1346 [79208]: https://github.com/rust-lang/rust/pull/79208
1347 [78429]: https://github.com/rust-lang/rust/pull/78429
1348 [82733]: https://github.com/rust-lang/rust/pull/82733
1349 [82594]: https://github.com/rust-lang/rust/pull/82594
1350 [79078]: https://github.com/rust-lang/rust/pull/79078
1351 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1352 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1353 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1354 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1355 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1356 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1357 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1358 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1359 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1360 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1361 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1362 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1363 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1364 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1365 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1366 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1367 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1368 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1369 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1370 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1371 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1372 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1374 Version 1.51.0 (2021-03-25)
1375 ============================
1379 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1380 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1381 E.g. you can now write the following. Note: Only values of primitive integers,
1382 `bool`, or `char` types are currently permitted.
1384 struct GenericArray<T, const LENGTH: usize> {
1388 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1389 const fn last(&self) -> Option<&T> {
1393 Some(&self.inner[LENGTH - 1])
1403 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1404 This option controls whether debug information is split across multiple files
1405 or packed into a single file. **Note** This option is unstable on other platforms.
1406 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1407 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1408 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1409 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1411 \* Refer to Rust's [platform support page][platform-support-doc] for more
1412 information on Rust's tiered platform support.
1417 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1418 - [`str` now implements `AsMut<str>`.][80279]
1419 - [`u64` and `u128` now implement `From<char>`.][79502]
1420 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1421 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1422 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1423 - [`io::Empty` now implements `io::Seek`.][78044]
1424 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1425 `T: ?Sized` types.][80764]
1426 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1432 - [`Arc::decrement_strong_count`]
1433 - [`Arc::increment_strong_count`]
1434 - [`Once::call_once_force`]
1435 - [`Peekable::next_if_eq`]
1436 - [`Peekable::next_if`]
1437 - [`Seek::stream_position`]
1438 - [`array::IntoIter`]
1439 - [`panic::panic_any`]
1441 - [`ptr::addr_of_mut!`]
1442 - [`slice::fill_with`]
1443 - [`slice::split_inclusive_mut`]
1444 - [`slice::split_inclusive`]
1445 - [`slice::strip_prefix`]
1446 - [`slice::strip_suffix`]
1447 - [`str::split_inclusive`]
1448 - [`sync::OnceState`]
1450 - [`VecDeque::range`]
1451 - [`VecDeque::range_mut`]
1455 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1456 codegen option.][cargo/9112]
1457 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1458 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1459 to avoid unifying features of dependencies where that unification could be unwanted.
1460 Such as using the same dependency with a `std` feature in a build scripts and
1461 proc-macros, while using the `no-std` feature in the final binary. See the
1462 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1467 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1468 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1469 documentation.][79642]
1471 Various improvements to intra-doc links:
1473 - [You can link to non-path primitives such as `slice`.][80181]
1474 - [You can link to associated items.][74489]
1475 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1479 - [You can now pass `--include-ignored` to tests (e.g. with
1480 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1485 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1486 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1488 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1489 for the distributed artifacts.][81521]
1490 - `armv5te-unknown-linux-gnueabi`
1491 - `sparc64-unknown-linux-gnu`
1492 - `thumbv7neon-unknown-linux-gnueabihf`
1493 - `armv7-unknown-linux-gnueabi`
1494 - `x86_64-unknown-linux-gnux32`
1495 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1500 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1502 [79135]: https://github.com/rust-lang/rust/pull/79135
1503 [74489]: https://github.com/rust-lang/rust/pull/74489
1504 [76934]: https://github.com/rust-lang/rust/pull/76934
1505 [79570]: https://github.com/rust-lang/rust/pull/79570
1506 [80181]: https://github.com/rust-lang/rust/pull/80181
1507 [79642]: https://github.com/rust-lang/rust/pull/79642
1508 [80945]: https://github.com/rust-lang/rust/pull/80945
1509 [80279]: https://github.com/rust-lang/rust/pull/80279
1510 [80053]: https://github.com/rust-lang/rust/pull/80053
1511 [79502]: https://github.com/rust-lang/rust/pull/79502
1512 [75180]: https://github.com/rust-lang/rust/pull/75180
1513 [81521]: https://github.com/rust-lang/rust/pull/81521
1514 [80968]: https://github.com/rust-lang/rust/pull/80968
1515 [80959]: https://github.com/rust-lang/rust/pull/80959
1516 [80718]: https://github.com/rust-lang/rust/pull/80718
1517 [80653]: https://github.com/rust-lang/rust/pull/80653
1518 [80579]: https://github.com/rust-lang/rust/pull/80579
1519 [79998]: https://github.com/rust-lang/rust/pull/79998
1520 [78044]: https://github.com/rust-lang/rust/pull/78044
1521 [81455]: https://github.com/rust-lang/rust/pull/81455
1522 [80764]: https://github.com/rust-lang/rust/pull/80764
1523 [80749]: https://github.com/rust-lang/rust/pull/80749
1524 [80662]: https://github.com/rust-lang/rust/pull/80662
1525 [79134]: https://github.com/rust-lang/rust/pull/79134
1526 [80966]: https://github.com/rust-lang/rust/pull/80966
1527 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1528 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1529 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1530 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1531 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1532 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1533 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1534 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1535 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1536 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1537 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1538 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1539 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1540 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1541 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1542 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1543 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1544 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1545 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1546 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1547 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1548 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1549 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1551 Version 1.50.0 (2021-02-11)
1552 ============================
1555 -----------------------
1556 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1557 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1558 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1561 -----------------------
1562 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1563 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1564 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1565 - [Dropped support for all cloudabi targets.][78439]
1567 \* Refer to Rust's [platform support page][platform-support-doc] for more
1568 information on Rust's tiered platform support.
1571 -----------------------
1573 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1574 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1575 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1576 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1577 up the same amount of space as `File`.
1583 - [`btree_map::Entry::or_insert_with_key`]
1586 - [`hash_map::Entry::or_insert_with_key`]
1590 - [`UnsafeCell::get_mut`]
1592 The following previously stable methods are now `const`.
1594 - [`IpAddr::is_ipv4`]
1595 - [`IpAddr::is_ipv6`]
1596 - [`IpAddr::is_unspecified`]
1597 - [`IpAddr::is_loopback`]
1598 - [`IpAddr::is_multicast`]
1599 - [`Ipv4Addr::octets`]
1600 - [`Ipv4Addr::is_loopback`]
1601 - [`Ipv4Addr::is_private`]
1602 - [`Ipv4Addr::is_link_local`]
1603 - [`Ipv4Addr::is_multicast`]
1604 - [`Ipv4Addr::is_broadcast`]
1605 - [`Ipv4Addr::is_documentation`]
1606 - [`Ipv4Addr::to_ipv6_compatible`]
1607 - [`Ipv4Addr::to_ipv6_mapped`]
1608 - [`Ipv6Addr::segments`]
1609 - [`Ipv6Addr::is_unspecified`]
1610 - [`Ipv6Addr::is_loopback`]
1611 - [`Ipv6Addr::is_multicast`]
1612 - [`Ipv6Addr::to_ipv4`]
1615 - [`Layout::from_size_align`]
1616 - `pow` for all integer types.
1617 - `checked_pow` for all integer types.
1618 - `saturating_pow` for all integer types.
1619 - `wrapping_pow` for all integer types.
1620 - `next_power_of_two` for all unsigned integer types.
1621 - `checked_next_power_of_two` for all unsigned integer types.
1624 -----------------------
1626 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1627 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1628 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1629 contents of that directory for changes.][cargo/8973]
1630 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1635 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1636 - [Running tests will now print the total time taken to execute.][75752]
1641 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1642 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1643 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1644 unhygenic `macro_rules!` macros.][79472]
1645 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1646 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1647 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1648 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1649 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1650 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1652 [74989]: https://github.com/rust-lang/rust/pull/74989
1653 [79261]: https://github.com/rust-lang/rust/pull/79261
1654 [79896]: https://github.com/rust-lang/rust/pull/79896
1655 [79484]: https://github.com/rust-lang/rust/pull/79484
1656 [79472]: https://github.com/rust-lang/rust/pull/79472
1657 [79270]: https://github.com/rust-lang/rust/pull/79270
1658 [79003]: https://github.com/rust-lang/rust/pull/79003
1659 [78864]: https://github.com/rust-lang/rust/pull/78864
1660 [78636]: https://github.com/rust-lang/rust/pull/78636
1661 [78439]: https://github.com/rust-lang/rust/pull/78439
1662 [78343]: https://github.com/rust-lang/rust/pull/78343
1663 [78296]: https://github.com/rust-lang/rust/pull/78296
1664 [78068]: https://github.com/rust-lang/rust/pull/78068
1665 [75752]: https://github.com/rust-lang/rust/pull/75752
1666 [74699]: https://github.com/rust-lang/rust/pull/74699
1667 [78142]: https://github.com/rust-lang/rust/pull/78142
1668 [77484]: https://github.com/rust-lang/rust/pull/77484
1669 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1670 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1671 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1672 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1673 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1674 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1675 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1676 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1677 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1678 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1679 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1680 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1681 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1682 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1683 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1684 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1685 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1686 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1687 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1688 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1689 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1690 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1691 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1692 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1693 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1694 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1695 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1696 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1697 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1698 [`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
1699 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1700 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1701 [`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
1702 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1705 Version 1.49.0 (2020-12-31)
1706 ============================
1709 -----------------------
1711 - [Unions can now implement `Drop`, and you can now have a field in a union
1712 with `ManuallyDrop<T>`.][77547]
1713 - [You can now cast uninhabited enums to integers.][76199]
1714 - [You can now bind by reference and by move in patterns.][76119] This
1715 allows you to selectively borrow individual components of a type. E.g.
1723 let person = Person {
1724 name: String::from("Alice"),
1728 // `name` is moved out of person, but `age` is referenced.
1729 let Person { name, ref age } = person;
1730 println!("{} {}", name, age);
1734 -----------------------
1736 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1737 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1738 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1739 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1740 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1741 - [Output from threads spawned in tests is now captured.][78227]
1742 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1744 \* Refer to Rust's [platform support page][platform-support-doc] for more
1745 information on Rust's tiered platform support.
1748 -----------------------
1750 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1751 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1756 - [`slice::select_nth_unstable`]
1757 - [`slice::select_nth_unstable_by`]
1758 - [`slice::select_nth_unstable_by_key`]
1760 The following previously stable methods are now `const`.
1762 - [`Poll::is_ready`]
1763 - [`Poll::is_pending`]
1766 -----------------------
1767 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1768 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1769 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1770 variable will be set if the crate being built is one the user selected to build, either
1771 with `-p` or through defaults.
1772 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1778 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1779 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1780 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1781 Previously such invalid or unused attributes could be ignored.
1782 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1783 read [this post about the changes][rustdoc-ws-post] for more details.
1784 - [Trait bounds are no longer inferred for associated types.][79904]
1788 These changes provide no direct user facing benefits, but represent significant
1789 improvements to the internals and overall performance of rustc and
1792 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1793 Local Storage model.][78201]
1794 - [Calculate visibilities once in resolve.][78077]
1795 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1796 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1799 [75991]: https://github.com/rust-lang/rust/pull/75991
1800 [78951]: https://github.com/rust-lang/rust/pull/78951
1801 [78848]: https://github.com/rust-lang/rust/pull/78848
1802 [78746]: https://github.com/rust-lang/rust/pull/78746
1803 [78376]: https://github.com/rust-lang/rust/pull/78376
1804 [78228]: https://github.com/rust-lang/rust/pull/78228
1805 [78227]: https://github.com/rust-lang/rust/pull/78227
1806 [78201]: https://github.com/rust-lang/rust/pull/78201
1807 [78109]: https://github.com/rust-lang/rust/pull/78109
1808 [78077]: https://github.com/rust-lang/rust/pull/78077
1809 [77997]: https://github.com/rust-lang/rust/pull/77997
1810 [77703]: https://github.com/rust-lang/rust/pull/77703
1811 [77547]: https://github.com/rust-lang/rust/pull/77547
1812 [77015]: https://github.com/rust-lang/rust/pull/77015
1813 [76199]: https://github.com/rust-lang/rust/pull/76199
1814 [76119]: https://github.com/rust-lang/rust/pull/76119
1815 [75914]: https://github.com/rust-lang/rust/pull/75914
1816 [79004]: https://github.com/rust-lang/rust/pull/79004
1817 [78676]: https://github.com/rust-lang/rust/pull/78676
1818 [79904]: https://github.com/rust-lang/rust/issues/79904
1819 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1820 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1821 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1822 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1823 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1824 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1825 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1826 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1827 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1828 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1830 Version 1.48.0 (2020-11-19)
1831 ==========================
1836 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1837 is still rejected *semantically*, but can now be parsed by procedural macros.
1841 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1842 `rustc` whether to link its own C runtime and libraries or to rely on a external
1843 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1844 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1845 Note: If you're using cargo you must explicitly pass the `--target` flag.
1846 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1848 \* Refer to Rust's [platform support page][platform-support-doc] for more
1849 information on Rust's tiered platform support.
1853 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1854 and `&Stderr`.][76275]
1855 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1856 - [The `matches!` macro now supports having a trailing comma.][74880]
1857 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1858 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1862 - [`slice::as_ptr_range`]
1863 - [`slice::as_mut_ptr_range`]
1864 - [`VecDeque::make_contiguous`]
1865 - [`future::pending`]
1868 The following previously stable methods are now `const fn`'s:
1870 - [`Option::is_some`]
1871 - [`Option::is_none`]
1872 - [`Option::as_ref`]
1874 - [`Result::is_err`]
1875 - [`Result::as_ref`]
1876 - [`Ordering::reverse`]
1877 - [`Ordering::then`]
1884 - [You can now link to items in `rustdoc` using the intra-doc link
1885 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1886 a link to `std::future`'s documentation. See ["Linking to items by
1887 name"][intradoc-links] for more information.
1888 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1889 when searching through `rustdoc`'s UI.][75740]
1893 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1894 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1895 promoted to `'static` lifetime any more inside `const fn`s.
1896 - [Associated type bindings on trait objects are now verified to meet the bounds
1897 declared on the trait when checking that they implement the trait.][27675]
1898 - [When trait bounds on associated types or opaque types are ambiguous, the
1899 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1900 - [Fixed recursive nonterminals not being expanded in macros during
1901 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1902 correctly handling recursive nonterminal tokens.
1903 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1904 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1905 in places where they have no effect.][73461]
1906 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1907 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1908 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1909 disallow zero-initialization.][71274]
1910 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1911 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1912 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1913 see the [`catch_unwind`] documentation for further information.
1919 These changes provide no direct user facing benefits, but represent significant
1920 improvements to the internals and overall performance of rustc and
1923 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1924 You can continue building with `make` by setting `ninja=false` in
1926 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1927 - [Made `ensure_sufficient_stack()` non-generic][76680]
1929 [78143]: https://github.com/rust-lang/rust/issues/78143
1930 [76680]: https://github.com/rust-lang/rust/pull/76680/
1931 [76030]: https://github.com/rust-lang/rust/pull/76030/
1932 [70212]: https://github.com/rust-lang/rust/pull/70212/
1933 [27675]: https://github.com/rust-lang/rust/issues/27675/
1934 [54121]: https://github.com/rust-lang/rust/issues/54121/
1935 [71274]: https://github.com/rust-lang/rust/pull/71274/
1936 [77386]: https://github.com/rust-lang/rust/pull/77386/
1937 [77153]: https://github.com/rust-lang/rust/pull/77153/
1938 [77055]: https://github.com/rust-lang/rust/pull/77055/
1939 [76275]: https://github.com/rust-lang/rust/pull/76275/
1940 [76310]: https://github.com/rust-lang/rust/pull/76310/
1941 [76420]: https://github.com/rust-lang/rust/pull/76420/
1942 [76158]: https://github.com/rust-lang/rust/pull/76158/
1943 [75857]: https://github.com/rust-lang/rust/pull/75857/
1944 [75585]: https://github.com/rust-lang/rust/pull/75585/
1945 [75740]: https://github.com/rust-lang/rust/pull/75740/
1946 [75502]: https://github.com/rust-lang/rust/pull/75502/
1947 [74880]: https://github.com/rust-lang/rust/pull/74880/
1948 [74922]: https://github.com/rust-lang/rust/pull/74922/
1949 [74430]: https://github.com/rust-lang/rust/pull/74430/
1950 [74194]: https://github.com/rust-lang/rust/pull/74194/
1951 [73461]: https://github.com/rust-lang/rust/pull/73461/
1952 [73166]: https://github.com/rust-lang/rust/pull/73166/
1953 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1954 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1955 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1956 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1957 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1958 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1959 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1960 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1961 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1962 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1963 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1964 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1965 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1966 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1967 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1970 Version 1.47.0 (2020-10-08)
1971 ==========================
1975 - [Closures will now warn when not used.][74869]
1979 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1980 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1982 - [Upgraded to LLVM 11.][73526]
1983 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1984 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1985 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1987 \* Refer to Rust's [platform support page][platform-support-doc] for more
1988 information on Rust's tiered platform support.
1992 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1993 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1994 those of length less than 33.][74060]
1995 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1996 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1997 `PartialEq`, and `PartialOrd`.][73583]
2001 - [`Ident::new_raw`]
2002 - [`Range::is_empty`]
2003 - [`RangeInclusive::is_empty`]
2004 - [`Result::as_deref`]
2005 - [`Result::as_deref_mut`]
2007 - [`pointer::offset_from`]
2011 The following previously stable APIs have now been made const.
2013 - [The `new` method for all `NonZero` integers.][73858]
2014 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2015 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2016 methods for all integers.][73858]
2017 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2018 signed integers.][73858]
2019 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2020 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2021 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2022 `is_ascii_control` methods for `char` and `u8`.][73858]
2026 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2027 You can override this by setting the following in your `Cargo.toml`.
2029 [profile.release.build-override]
2032 - [`cargo-help` will now display man pages for commands rather just the
2033 `--help` text.][cargo/8456]
2034 - [`cargo-metadata` now emits a `test` field indicating if a target has
2035 tests enabled.][cargo/8478]
2036 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2037 - [`cargo-publish` will now use an alternative registry by default if it's the
2038 only registry specified in `package.publish`.][cargo/8571]
2042 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2043 type based search.][75366]
2044 - [Added the Ayu theme to rustdoc.][71237]
2048 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2049 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2050 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2051 help to preserve more span information.][73084] These changes may cause
2052 compiliation errors if your macro was unhygenic or didn't correctly handle
2054 - [Moved support for the CloudABI target to tier 3.][75568]
2055 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2056 - [Added the `rustc-docs` component.][75560] This allows you to install
2057 and read the documentation for the compiler internal APIs. (Currently only
2058 available for `x86_64-unknown-linux-gnu`.)
2063 - [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.
2065 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2066 [75048]: https://github.com/rust-lang/rust/pull/75048/
2067 [74163]: https://github.com/rust-lang/rust/pull/74163/
2068 [71237]: https://github.com/rust-lang/rust/pull/71237/
2069 [74869]: https://github.com/rust-lang/rust/pull/74869/
2070 [73858]: https://github.com/rust-lang/rust/pull/73858/
2071 [75716]: https://github.com/rust-lang/rust/pull/75716/
2072 [75560]: https://github.com/rust-lang/rust/pull/75560/
2073 [75568]: https://github.com/rust-lang/rust/pull/75568/
2074 [75366]: https://github.com/rust-lang/rust/pull/75366/
2075 [75204]: https://github.com/rust-lang/rust/pull/75204/
2076 [74650]: https://github.com/rust-lang/rust/pull/74650/
2077 [74419]: https://github.com/rust-lang/rust/pull/74419/
2078 [73964]: https://github.com/rust-lang/rust/pull/73964/
2079 [74021]: https://github.com/rust-lang/rust/pull/74021/
2080 [74060]: https://github.com/rust-lang/rust/pull/74060/
2081 [73893]: https://github.com/rust-lang/rust/pull/73893/
2082 [73526]: https://github.com/rust-lang/rust/pull/73526/
2083 [73583]: https://github.com/rust-lang/rust/pull/73583/
2084 [73084]: https://github.com/rust-lang/rust/pull/73084/
2085 [73197]: https://github.com/rust-lang/rust/pull/73197/
2086 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2087 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2088 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2089 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2090 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2091 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2092 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2093 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2094 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2095 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2096 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2097 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2098 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2099 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2102 Version 1.46.0 (2020-08-27)
2103 ==========================
2107 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2108 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2109 const functions.][73862]
2110 - [The `#[track_caller]` attribute can now be added to functions to use the
2111 function's caller's location information for panic messages.][72445]
2112 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2113 `x.0.0` over `(x.0).0`.
2114 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2115 You currently can't use `mem::transmute` in constant functions.
2119 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2120 - [Enabled static "Position Independent Executables" by default
2121 for `x86_64-unknown-linux-musl`.][70740]
2125 - [`mem::forget` is now a `const fn`.][73887]
2126 - [`String` now implements `From<char>`.][73466]
2127 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2128 integer types.][73032]
2129 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2130 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2131 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2132 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2133 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2134 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2139 - [`vec::Drain::as_slice`]
2143 Added a number of new environment variables that are now available when
2144 compiling your crate.
2146 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2147 the specific binary being compiled and the name of the crate.
2148 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2149 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2153 - [The target configuration option `abi_blacklist` has been renamed
2154 to `unsupported_abis`.][74150] The old name will still continue to work.
2155 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2156 This was previously accepted but will become a hard error in a future release.
2157 - [Rustc will fail to compile if you have a struct with
2158 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2160 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2161 ensure that spans have the correct information, and may cause breakage if you
2162 were relying on receiving spans with dummy information.
2163 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2164 a legacy installer that was replaced by a MSI installer a few years ago but
2165 was still being built.
2166 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2167 - [Rustc will no longer accept overlapping trait implementations that only
2168 differ in how the lifetime was bound.][72493]
2169 - [Rustc now correctly relates the lifetime of an existential associated
2170 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2171 you to pass a shorter lifetime than expected.
2172 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2173 The library will need to be installed for `rustc` to work, even though we
2174 expect it to be already available on most systems.
2175 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2177 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2178 exact output returned by rustc's pretty printing is an unstable
2179 implementation detail: we recommend any macro relying on it to switch to a
2180 more robust parsing system.
2182 [75453]: https://github.com/rust-lang/rust/issues/75453/
2183 [74820]: https://github.com/rust-lang/rust/issues/74820/
2184 [74420]: https://github.com/rust-lang/rust/issues/74420/
2185 [74109]: https://github.com/rust-lang/rust/pull/74109/
2186 [74150]: https://github.com/rust-lang/rust/pull/74150/
2187 [73862]: https://github.com/rust-lang/rust/pull/73862/
2188 [73887]: https://github.com/rust-lang/rust/pull/73887/
2189 [73466]: https://github.com/rust-lang/rust/pull/73466/
2190 [73516]: https://github.com/rust-lang/rust/pull/73516/
2191 [73293]: https://github.com/rust-lang/rust/pull/73293/
2192 [73007]: https://github.com/rust-lang/rust/pull/73007/
2193 [73032]: https://github.com/rust-lang/rust/pull/73032/
2194 [72920]: https://github.com/rust-lang/rust/pull/72920/
2195 [72569]: https://github.com/rust-lang/rust/pull/72569/
2196 [72583]: https://github.com/rust-lang/rust/pull/72583/
2197 [72584]: https://github.com/rust-lang/rust/pull/72584/
2198 [72717]: https://github.com/rust-lang/rust/pull/72717/
2199 [72437]: https://github.com/rust-lang/rust/pull/72437/
2200 [72445]: https://github.com/rust-lang/rust/pull/72445/
2201 [72486]: https://github.com/rust-lang/rust/pull/72486/
2202 [72493]: https://github.com/rust-lang/rust/pull/72493/
2203 [72331]: https://github.com/rust-lang/rust/pull/72331/
2204 [71896]: https://github.com/rust-lang/rust/pull/71896/
2205 [71660]: https://github.com/rust-lang/rust/pull/71660/
2206 [71322]: https://github.com/rust-lang/rust/pull/71322/
2207 [70740]: https://github.com/rust-lang/rust/pull/70740/
2208 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2209 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2210 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2211 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2212 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2215 Version 1.45.2 (2020-08-03)
2216 ==========================
2218 * [Fix bindings in tuple struct patterns][74954]
2219 * [Fix track_caller integration with trait objects][74784]
2221 [74954]: https://github.com/rust-lang/rust/issues/74954
2222 [74784]: https://github.com/rust-lang/rust/issues/74784
2225 Version 1.45.1 (2020-07-30)
2226 ==========================
2228 * [Fix const propagation with references.][73613]
2229 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2230 * [Avoid spurious implicit region bound.][74509]
2231 * [Install clippy on x.py install][74457]
2233 [73613]: https://github.com/rust-lang/rust/pull/73613
2234 [73078]: https://github.com/rust-lang/rust/issues/73078
2235 [74509]: https://github.com/rust-lang/rust/pull/74509
2236 [74457]: https://github.com/rust-lang/rust/pull/74457
2239 Version 1.45.0 (2020-07-16)
2240 ==========================
2244 - [Out of range float to int conversions using `as` has been defined as a saturating
2245 conversion.][71269] This was previously undefined behaviour, but you can use the
2246 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2247 may be desirable in rare performance sensitive situations.
2248 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2249 using `u64`.][70705]
2250 - [Function like procedural macros can now be used in expression, pattern, and statement
2251 positions.][68717] This means you can now use a function-like procedural macro
2252 anywhere you can use a declarative (`macro_rules!`) macro.
2256 - [You can now override individual target features through the `target-feature`
2257 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2258 equivalent to `-C target-feature=+avx2,+fma`.
2259 - [Added the `force-unwind-tables` flag.][69984] This option allows
2260 rustc to always generate unwind tables regardless of panic strategy.
2261 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2262 to include LLVM bitcode into generated `rlib`s (this is on by default).
2263 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2264 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2265 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2266 - [Upgraded to LLVM 10.][67759]
2268 \* Refer to Rust's [platform support page][platform-support-doc] for more
2269 information on Rust's tiered platform support.
2274 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2276 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2277 - [You can now use `char` with
2278 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2279 a range of codepoints.][72413] E.g.
2280 you can now write the following;
2282 for ch in 'a'..='z' {
2286 // Prints "abcdefghijklmnopqrstuvwxyz"
2288 - [`OsString` now implements `FromStr`.][71662]
2289 - [The `saturating_neg` method has been added to all signed integer primitive
2290 types, and the `saturating_abs` method has been added for all integer
2291 primitive types.][71886]
2292 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2293 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2295 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2296 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2297 integer types.][69813]
2298 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2299 integer types.][72324]
2300 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2305 - [`BTreeMap::remove_entry`]
2307 - [`rc::Weak::as_ptr`]
2308 - [`rc::Weak::from_raw`]
2309 - [`rc::Weak::into_raw`]
2310 - [`str::strip_prefix`]
2311 - [`str::strip_suffix`]
2312 - [`sync::Weak::as_ptr`]
2313 - [`sync::Weak::from_raw`]
2314 - [`sync::Weak::into_raw`]
2315 - [`char::UNICODE_VERSION`]
2316 - [`Span::resolved_at`]
2317 - [`Span::located_at`]
2318 - [`Span::mixed_site`]
2319 - [`unix::process::CommandExt::arg0`]
2324 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2329 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2330 `~~outdated information~~` becomes "~~outdated information~~".
2331 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2335 - [Trying to self initialize a static value (that is creating a value using
2336 itself) is unsound and now causes a compile error.][71140]
2337 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2338 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2339 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2340 previously undocumented and not intended for public use. Rustdoc still provides
2341 a non-zero exit code on errors.
2342 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2343 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2344 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2345 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2346 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2350 - [Make clippy a git subtree instead of a git submodule][70655]
2351 - [Unify the undo log of all snapshot types][69464]
2353 [71848]: https://github.com/rust-lang/rust/issues/71848/
2354 [73420]: https://github.com/rust-lang/rust/issues/73420/
2355 [72324]: https://github.com/rust-lang/rust/pull/72324/
2356 [71843]: https://github.com/rust-lang/rust/pull/71843/
2357 [71886]: https://github.com/rust-lang/rust/pull/71886/
2358 [72234]: https://github.com/rust-lang/rust/pull/72234/
2359 [72239]: https://github.com/rust-lang/rust/pull/72239/
2360 [72397]: https://github.com/rust-lang/rust/pull/72397/
2361 [72413]: https://github.com/rust-lang/rust/pull/72413/
2362 [72014]: https://github.com/rust-lang/rust/pull/72014/
2363 [72062]: https://github.com/rust-lang/rust/pull/72062/
2364 [72094]: https://github.com/rust-lang/rust/pull/72094/
2365 [72133]: https://github.com/rust-lang/rust/pull/72133/
2366 [67759]: https://github.com/rust-lang/rust/pull/67759/
2367 [71900]: https://github.com/rust-lang/rust/pull/71900/
2368 [71928]: https://github.com/rust-lang/rust/pull/71928/
2369 [71662]: https://github.com/rust-lang/rust/pull/71662/
2370 [71716]: https://github.com/rust-lang/rust/pull/71716/
2371 [71447]: https://github.com/rust-lang/rust/pull/71447/
2372 [71269]: https://github.com/rust-lang/rust/pull/71269/
2373 [71095]: https://github.com/rust-lang/rust/pull/71095/
2374 [71140]: https://github.com/rust-lang/rust/pull/71140/
2375 [70655]: https://github.com/rust-lang/rust/pull/70655/
2376 [70705]: https://github.com/rust-lang/rust/pull/70705/
2377 [69984]: https://github.com/rust-lang/rust/pull/69984/
2378 [69813]: https://github.com/rust-lang/rust/pull/69813/
2379 [69464]: https://github.com/rust-lang/rust/pull/69464/
2380 [68717]: https://github.com/rust-lang/rust/pull/68717/
2381 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2382 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2383 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2384 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2385 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2386 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2387 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2388 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2389 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2390 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2391 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2392 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2393 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2394 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2395 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2396 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2397 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2400 Version 1.44.1 (2020-06-18)
2401 ===========================
2403 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2404 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2405 * [Fix crashes when finding backtrace on macOS.][71397]
2406 * [Clippy applies lint levels into different files.][clippy/5356]
2408 [71397]: https://github.com/rust-lang/rust/issues/71397
2409 [73078]: https://github.com/rust-lang/rust/issues/73078
2410 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2411 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2414 Version 1.44.0 (2020-06-04)
2415 ==========================
2419 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2420 - [Added the `unused_braces` lint.][70081]
2422 **Syntax-only changes**
2424 - [Expansion-driven outline module parsing][69838]
2429 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2434 These are still rejected semantically, so you will likely receive an error but
2435 these changes can be seen and parsed by macros and conditional compilation.
2439 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2440 Additionally when in incremental mode rustc defaults to 256 codegen units.
2441 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2442 a panic is thrown.][67502]
2443 - [Added tier 3\* support for the `aarch64-unknown-none` and
2444 `aarch64-unknown-none-softfloat` targets.][68334]
2445 - [Added tier 3 support for `arm64-apple-tvos` and
2446 `x86_64-apple-tvos` targets.][68191]
2451 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2452 `vec![]` to be able to be used in `const` contexts.
2453 - [`convert::Infallible` now implements `Hash`.][70281]
2454 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2455 a `&mut OsStr`.][70048]
2456 - [Unicode 13 is now supported.][69929]
2457 - [`String` now implements `From<&mut str>`.][69661]
2458 - [`IoSlice` now implements `Copy`.][69403]
2459 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2460 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2461 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2462 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2463 integer types.][69373]
2467 - [`PathBuf::with_capacity`]
2468 - [`PathBuf::capacity`]
2469 - [`PathBuf::clear`]
2470 - [`PathBuf::reserve`]
2471 - [`PathBuf::reserve_exact`]
2472 - [`PathBuf::shrink_to_fit`]
2473 - [`f32::to_int_unchecked`]
2474 - [`f64::to_int_unchecked`]
2475 - [`Layout::align_to`]
2476 - [`Layout::pad_to_align`]
2478 - [`Layout::extend`]
2482 - [Added the `cargo tree` command which will print a tree graph of
2483 your dependencies.][cargo/8062] E.g.
2485 mdbook v0.3.2 (/Users/src/rust/mdbook)
2487 │ ├── html5ever v0.24.0
2489 │ │ │ └── cfg-if v0.1.9
2491 │ │ └── markup5ever v0.9.0
2492 │ │ ├── log v0.4.8 (*)
2494 │ │ │ └── phf_shared v0.7.24
2495 │ │ │ ├── siphasher v0.2.3
2496 │ │ │ └── unicase v1.4.2
2497 │ │ │ [build-dependencies]
2498 │ │ │ └── version_check v0.1.5
2501 You can also display dependencies on multiple versions of the same crate with
2502 `cargo tree -d` (short for `cargo tree --duplicates`).
2506 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2507 the version in the sidebar.][69494]
2511 - [Rustc now correctly generates static libraries on Windows GNU targets with
2512 the `.a` extension, rather than the previous `.lib`.][70937]
2513 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2514 - [The `file_name` property in JSON output of macro errors now points the actual
2515 source file rather than the previous format of `<NAME macros>`.][70969]
2516 **Note:** this may not point to a file that actually exists on the user's system.
2517 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2518 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2519 not allow zero initialization such as `NonZeroU8`.][66059] This was
2520 previously a warning.
2521 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2522 operator has been defined as a saturating operation.][71269] This was previously
2523 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2524 continue using the current behaviour, which may be desirable in rare performance
2525 sensitive situations.
2529 These changes provide no direct user facing benefits, but represent significant
2530 improvements to the internals and overall performance of rustc and
2533 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2534 - [Replace big JS dict with JSON parsing.][71250]
2536 [69373]: https://github.com/rust-lang/rust/pull/69373/
2537 [66059]: https://github.com/rust-lang/rust/pull/66059/
2538 [68191]: https://github.com/rust-lang/rust/pull/68191/
2539 [68899]: https://github.com/rust-lang/rust/pull/68899/
2540 [71147]: https://github.com/rust-lang/rust/pull/71147/
2541 [71250]: https://github.com/rust-lang/rust/pull/71250/
2542 [70937]: https://github.com/rust-lang/rust/pull/70937/
2543 [70969]: https://github.com/rust-lang/rust/pull/70969/
2544 [70632]: https://github.com/rust-lang/rust/pull/70632/
2545 [70281]: https://github.com/rust-lang/rust/pull/70281/
2546 [70345]: https://github.com/rust-lang/rust/pull/70345/
2547 [70048]: https://github.com/rust-lang/rust/pull/70048/
2548 [70081]: https://github.com/rust-lang/rust/pull/70081/
2549 [70156]: https://github.com/rust-lang/rust/pull/70156/
2550 [71269]: https://github.com/rust-lang/rust/pull/71269/
2551 [69838]: https://github.com/rust-lang/rust/pull/69838/
2552 [69929]: https://github.com/rust-lang/rust/pull/69929/
2553 [69661]: https://github.com/rust-lang/rust/pull/69661/
2554 [69778]: https://github.com/rust-lang/rust/pull/69778/
2555 [69494]: https://github.com/rust-lang/rust/pull/69494/
2556 [69403]: https://github.com/rust-lang/rust/pull/69403/
2557 [69033]: https://github.com/rust-lang/rust/pull/69033/
2558 [68692]: https://github.com/rust-lang/rust/pull/68692/
2559 [68334]: https://github.com/rust-lang/rust/pull/68334/
2560 [67502]: https://github.com/rust-lang/rust/pull/67502/
2561 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2562 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2563 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2564 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2565 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2566 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2567 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2568 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2569 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2570 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2571 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2572 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2573 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2576 Version 1.43.1 (2020-05-07)
2577 ===========================
2579 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2580 * [Fixed the stabilization of AVX-512 features.][71473]
2581 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2583 [71430]: https://github.com/rust-lang/rust/pull/71430
2584 [71473]: https://github.com/rust-lang/rust/issues/71473
2585 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2588 Version 1.43.0 (2020-04-23)
2589 ==========================
2593 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2594 the type inferred correctly.][68129]
2595 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2597 **Syntax only changes**
2598 - [Allow `type Foo: Ord` syntactically.][69361]
2599 - [Fuse associated and extern items up to defaultness.][69194]
2600 - [Syntactically allow `self` in all `fn` contexts.][68764]
2601 - [Merge `fn` syntax + cleanup item parsing.][68728]
2602 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2603 For example, you may now write:
2605 macro_rules! mac_trait {
2615 These are still rejected *semantically*, so you will likely receive an error but
2616 these changes can be seen and parsed by macros and
2617 conditional compilation.
2622 - [You can now pass multiple lint flags to rustc to override the previous
2623 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2624 everything in the `unused` lint group except `unused-variables` which
2625 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2626 everything in the `unused` lint group **including** `unused-variables` since
2627 the allow flag is specified before the deny flag (and therefore overridden).
2628 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2629 if they are available on `windows-gnu`.][67429]
2630 - [rustc now buffers errors/warnings printed in JSON.][69227]
2634 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2635 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2636 respectively.][69538] **Note** These conversions are only available when `N`
2638 - [You can now use associated constants on floats and integers directly, rather
2639 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2640 `f32::NAN` with no imports.
2641 - [`u8::is_ascii` is now `const`.][68984]
2642 - [`String` now implements `AsMut<str>`.][68742]
2643 - [Added the `primitive` module to `std` and `core`.][67637] This module
2644 reexports Rust's primitive types. This is mainly useful in macros
2645 where you want avoid these types being shadowed.
2646 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2647 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2651 - [`Once::is_completed`]
2656 - [`iter::once_with`]
2660 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2661 your environment.][cargo/7823]
2662 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2663 executable path when running integration tests or benchmarks.][cargo/7697]
2664 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2665 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2669 - [Certain checks in the `const_err` lint were deemed unrelated to const
2670 evaluation][69185], and have been moved to the `unconditional_panic` and
2671 `arithmetic_overflow` lints.
2676 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2677 has been a warning since 1.36.0.
2678 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2679 led to some instances being accepted, and now correctly emits a hard error.
2681 [69340]: https://github.com/rust-lang/rust/pull/69340
2685 These changes provide no direct user facing benefits, but represent significant
2686 improvements to the internals and overall performance of `rustc` and
2689 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2690 - [Improved how rustc generates drop code.][67332]
2691 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2692 - [traits: preallocate 2 Vecs of known initial size][69022]
2693 - [Avoid exponential behaviour when relating types][68772]
2694 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2695 - [Improve performance of coherence checks][68966]
2696 - [Deduplicate types in the generator witness][68672]
2697 - [Invert control in struct_lint_level.][68725]
2699 [67332]: https://github.com/rust-lang/rust/pull/67332/
2700 [67429]: https://github.com/rust-lang/rust/pull/67429/
2701 [67637]: https://github.com/rust-lang/rust/pull/67637/
2702 [67642]: https://github.com/rust-lang/rust/pull/67642/
2703 [67878]: https://github.com/rust-lang/rust/pull/67878/
2704 [67885]: https://github.com/rust-lang/rust/pull/67885/
2705 [68129]: https://github.com/rust-lang/rust/pull/68129/
2706 [68672]: https://github.com/rust-lang/rust/pull/68672/
2707 [68725]: https://github.com/rust-lang/rust/pull/68725/
2708 [68728]: https://github.com/rust-lang/rust/pull/68728/
2709 [68738]: https://github.com/rust-lang/rust/pull/68738/
2710 [68742]: https://github.com/rust-lang/rust/pull/68742/
2711 [68764]: https://github.com/rust-lang/rust/pull/68764/
2712 [68772]: https://github.com/rust-lang/rust/pull/68772/
2713 [68943]: https://github.com/rust-lang/rust/pull/68943/
2714 [68952]: https://github.com/rust-lang/rust/pull/68952/
2715 [68966]: https://github.com/rust-lang/rust/pull/68966/
2716 [68984]: https://github.com/rust-lang/rust/pull/68984/
2717 [69022]: https://github.com/rust-lang/rust/pull/69022/
2718 [69185]: https://github.com/rust-lang/rust/pull/69185/
2719 [69194]: https://github.com/rust-lang/rust/pull/69194/
2720 [69201]: https://github.com/rust-lang/rust/pull/69201/
2721 [69227]: https://github.com/rust-lang/rust/pull/69227/
2722 [69548]: https://github.com/rust-lang/rust/pull/69548/
2723 [69256]: https://github.com/rust-lang/rust/pull/69256/
2724 [69361]: https://github.com/rust-lang/rust/pull/69361/
2725 [69366]: https://github.com/rust-lang/rust/pull/69366/
2726 [69538]: https://github.com/rust-lang/rust/pull/69538/
2727 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2728 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2729 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2730 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2731 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2732 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2733 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2734 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2737 Version 1.42.0 (2020-03-12)
2738 ==========================
2742 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2744 fn foo(words: &[&str]) {
2746 ["Hello", "World", "!", ..] => println!("Hello World!"),
2747 ["Foo", "Bar", ..] => println!("Baz"),
2748 rest => println!("{:?}", rest),
2752 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2753 that you can create an enum that has the exact layout and ABI of the type
2755 - [You can now use outer attribute procedural macros on inline modules.][64273]
2756 - [There are some *syntax-only* changes:][67131]
2757 - `default` is syntactically allowed before items in `trait` definitions.
2758 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2759 leave out their bodies in favor of `;`.
2760 - Bounds on associated types in `impl`s are now syntactically allowed
2761 (e.g. `type Foo: Ord;`).
2762 - `...` (the C-variadic type) may occur syntactically directly as the type of
2763 any function parameter.
2765 These are still rejected *semantically*, so you will likely receive an error
2766 but these changes can be seen and parsed by procedural macros and
2767 conditional compilation.
2771 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2772 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2773 - [`Option::{expect,unwrap}` and
2774 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2775 pointing to the location where they were called, rather than
2776 `core`'s internals. ][67887]
2778 \* Refer to Rust's [platform support page][platform-support-doc] for more
2779 information on Rust's tiered platform support.
2783 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2784 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2785 to implement `Sized`.][67935]
2786 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2787 - [`Layout::new` is now `const`.][66254]
2788 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2793 - [`CondVar::wait_while`]
2794 - [`CondVar::wait_timeout_while`]
2796 - [`DebugMap::value`]
2797 - [`ManuallyDrop::take`]
2799 - [`ptr::slice_from_raw_parts_mut`]
2800 - [`ptr::slice_from_raw_parts`]
2804 - [You no longer need to include `extern crate proc_macro;` to be able to
2805 `use proc_macro;` in the `2018` edition.][cargo/7700]
2809 - [`Error::description` has been deprecated, and its use will now produce a
2810 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2812 [68253]: https://github.com/rust-lang/rust/pull/68253/
2813 [68348]: https://github.com/rust-lang/rust/pull/68348/
2814 [67935]: https://github.com/rust-lang/rust/pull/67935/
2815 [68339]: https://github.com/rust-lang/rust/pull/68339/
2816 [68122]: https://github.com/rust-lang/rust/pull/68122/
2817 [64273]: https://github.com/rust-lang/rust/pull/64273/
2818 [67712]: https://github.com/rust-lang/rust/pull/67712/
2819 [67887]: https://github.com/rust-lang/rust/pull/67887/
2820 [67131]: https://github.com/rust-lang/rust/pull/67131/
2821 [67233]: https://github.com/rust-lang/rust/pull/67233/
2822 [66899]: https://github.com/rust-lang/rust/pull/66899/
2823 [66919]: https://github.com/rust-lang/rust/pull/66919/
2824 [66254]: https://github.com/rust-lang/rust/pull/66254/
2825 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2826 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2827 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2828 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2829 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2830 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2831 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2832 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2833 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2836 Version 1.41.1 (2020-02-27)
2837 ===========================
2839 * [Always check types of static items][69145]
2840 * [Always check lifetime bounds of `Copy` impls][69145]
2841 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2843 [69225]: https://github.com/rust-lang/rust/issues/69225
2844 [69145]: https://github.com/rust-lang/rust/pull/69145
2847 Version 1.41.0 (2020-01-30)
2848 ===========================
2853 - [You can now pass type parameters to foreign items when implementing
2854 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2855 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2856 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2857 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2858 - [You can now use any valid identifier in a `format_args` macro.][66847]
2859 Previously identifiers starting with an underscore were not allowed.
2860 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2861 enum variants.][66183] These are still rejected semantically, but
2862 can be seen and parsed by procedural macros and conditional compilation.
2863 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2864 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2865 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2867 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2872 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2873 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2874 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2875 - [You can now pass an arguments file passing the `@path` syntax
2876 to rustc.][66172] Note that the format differs somewhat from what is
2877 found in other tooling; please see [the documentation][argfile-docs] for
2879 - [You can now provide `--extern` flag without a path, indicating that it is
2880 available from the search path or specified with an `-L` flag.][64882]
2882 \* Refer to Rust's [platform support page][platform-support-doc] for more
2883 information on Rust's tiered platform support.
2885 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2890 - [The `core::panic` module is now stable.][66771] It was already stable
2892 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2893 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2894 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2899 - [`Result::map_or`]
2900 - [`Result::map_or_else`]
2901 - [`std::rc::Weak::weak_count`]
2902 - [`std::rc::Weak::strong_count`]
2903 - [`std::sync::Weak::weak_count`]
2904 - [`std::sync::Weak::strong_count`]
2909 - [Cargo will now document all the private items for binary crates
2910 by default.][cargo/7593]
2911 - [`cargo-install` will now reinstall the package if it detects that it is out
2912 of date.][cargo/7560]
2913 - [Cargo.lock now uses a more git friendly format that should help to reduce
2914 merge conflicts.][cargo/7579]
2915 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2916 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2917 optimisation level to `2` for debug builds. You can also use
2918 `[profile.<profile>.build-override]` to override build scripts and
2924 - [You can now specify `edition` in documentation code blocks to compile the block
2925 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2926 should be compiled the 2018 edition of Rust.
2927 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2928 current theme with `--check-theme`.][54733]
2929 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2934 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2935 Apple targets.][apple-32bit-drop] This means that the source code is still
2936 available to build, but the targets are no longer being tested and release
2937 binaries for those platforms will no longer be distributed by the Rust project.
2938 Please refer to the linked blog post for more information.
2940 [54733]: https://github.com/rust-lang/rust/pull/54733/
2941 [61351]: https://github.com/rust-lang/rust/pull/61351/
2942 [62514]: https://github.com/rust-lang/rust/pull/62514/
2943 [67255]: https://github.com/rust-lang/rust/pull/67255/
2944 [66661]: https://github.com/rust-lang/rust/pull/66661/
2945 [66771]: https://github.com/rust-lang/rust/pull/66771/
2946 [66847]: https://github.com/rust-lang/rust/pull/66847/
2947 [66238]: https://github.com/rust-lang/rust/pull/66238/
2948 [66277]: https://github.com/rust-lang/rust/pull/66277/
2949 [66325]: https://github.com/rust-lang/rust/pull/66325/
2950 [66172]: https://github.com/rust-lang/rust/pull/66172/
2951 [66183]: https://github.com/rust-lang/rust/pull/66183/
2952 [65879]: https://github.com/rust-lang/rust/pull/65879/
2953 [65013]: https://github.com/rust-lang/rust/pull/65013/
2954 [64882]: https://github.com/rust-lang/rust/pull/64882/
2955 [64325]: https://github.com/rust-lang/rust/pull/64325/
2956 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2957 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2958 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2959 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2960 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2961 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2962 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2963 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2964 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2965 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2966 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2968 Version 1.40.0 (2019-12-19)
2969 ===========================
2973 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2974 `const` contexts.][65188] e.g.
2977 pub struct Point(i32, i32);
2979 const ORIGIN: Point = {
2980 let constructor = Point;
2986 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2987 indicate that there may be variants or fields added in the future.][64639]
2988 For example this requires adding a wild-card branch (`_ => {}`) to any match
2989 statements on a non-exhaustive `enum`. [(RFC 2008)]
2990 - [You can now use function-like procedural macros in `extern` blocks and in
2991 type positions.][63931] e.g. `type Generated = macro!();`
2992 - [Function-like and attribute procedural macros can now emit
2993 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2994 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2995 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2996 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3000 - [Added tier 3 support\* for the
3001 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3002 - [Added tier 3 support for the
3003 `aarch64-unknown-none-softfloat` target.][64589]
3004 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3005 `mips64el-unknown-linux-muslabi64` targets.][65843]
3007 \* Refer to Rust's [platform support page][platform-support-doc] for more
3008 information on Rust's tiered platform support.
3012 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3016 - [`BTreeMap::get_key_value`]
3017 - [`HashMap::get_key_value`]
3018 - [`Option::as_deref_mut`]
3019 - [`Option::as_deref`]
3020 - [`Option::flatten`]
3021 - [`UdpSocket::peer_addr`]
3022 - [`f32::to_be_bytes`]
3023 - [`f32::to_le_bytes`]
3024 - [`f32::to_ne_bytes`]
3025 - [`f64::to_be_bytes`]
3026 - [`f64::to_le_bytes`]
3027 - [`f64::to_ne_bytes`]
3028 - [`f32::from_be_bytes`]
3029 - [`f32::from_le_bytes`]
3030 - [`f32::from_ne_bytes`]
3031 - [`f64::from_be_bytes`]
3032 - [`f64::from_le_bytes`]
3033 - [`f64::from_ne_bytes`]
3040 - [Cargo will now always display warnings, rather than only on
3041 fresh builds.][cargo/7450]
3042 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3043 now produce an error.][cargo/7507] Previously these flags were ignored.
3044 - [You can now publish `dev-dependencies` without including
3045 a `version`.][cargo/7333]
3049 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3050 when running documentation tests with `rustdoc`.][63803]
3054 - [As previously announced, any previous NLL warnings in the 2015 edition are
3055 now hard errors.][64221]
3056 - [The `include!` macro will now warn if it failed to include the
3057 entire file.][64284] The `include!` macro unintentionally only includes the
3058 first _expression_ in a file, and this can be unintuitive. This will become
3059 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3060 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3061 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3062 or `extern` blocks now correctly emits a hard error.
3064 [65294]: https://github.com/rust-lang/rust/pull/65294/
3065 [66103]: https://github.com/rust-lang/rust/pull/66103/
3066 [65843]: https://github.com/rust-lang/rust/pull/65843/
3067 [65188]: https://github.com/rust-lang/rust/pull/65188/
3068 [65092]: https://github.com/rust-lang/rust/pull/65092/
3069 [64589]: https://github.com/rust-lang/rust/pull/64589/
3070 [64639]: https://github.com/rust-lang/rust/pull/64639/
3071 [64221]: https://github.com/rust-lang/rust/pull/64221/
3072 [64284]: https://github.com/rust-lang/rust/pull/64284/
3073 [63931]: https://github.com/rust-lang/rust/pull/63931/
3074 [64035]: https://github.com/rust-lang/rust/pull/64035/
3075 [63674]: https://github.com/rust-lang/rust/pull/63674/
3076 [63803]: https://github.com/rust-lang/rust/pull/63803/
3077 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3078 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3079 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3080 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3081 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3082 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3083 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3084 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3085 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3086 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3087 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3088 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3089 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3090 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3091 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3092 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3093 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3094 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3095 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3096 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3097 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3098 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3099 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3100 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3101 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3104 Version 1.39.0 (2019-11-07)
3105 ===========================
3109 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3110 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3111 - [You can now use certain attributes on function, closure, and function pointer
3112 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3113 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3114 attributes applied to items. e.g.
3117 #[cfg(windows)] slice: &[u16],
3118 #[cfg(not(windows))] slice: &[u8],
3123 - [You can now take shared references to bind-by-move patterns in the `if` guards
3124 of `match` arms.][63118] e.g.
3127 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3131 // ---- `nums` is bound by move.
3132 if nums.iter().sum::<u8>() == 10
3133 // ^------ `.iter()` implicitly takes a reference to `nums`.
3136 // ----------- Legal as `nums` was bound by move and so we have ownership.
3138 _ => unreachable!(),
3147 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3148 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3149 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3150 **Note** Cargo currently doesn't use this feature. Refer to
3151 [cargo#7315][cargo/7315] to track this feature's progress.
3152 - [You can now pass `--show-output` argument to test binaries to print the
3153 output of successful tests.][62600]
3156 \* Refer to Rust's [platform support page][platform-support-doc] for more
3157 information on Rust's tiered platform support.
3161 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3162 - [`LinkedList::new` is now a `const` function.][63684]
3163 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3164 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3165 now `const`.][63786]
3169 - [`Pin::into_inner`]
3170 - [`Instant::checked_duration_since`]
3171 - [`Instant::saturating_duration_since`]
3175 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3176 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3177 `--all` is now deprecated.
3181 - [You can now pass `-Clinker` to rustdoc to control the linker used
3182 for compiling doctests.][63834]
3186 - [Code that was previously accepted by the old borrow checker, but rejected by
3187 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3188 previously a warning, and will also become a hard error in the Rust 2015
3189 edition in the 1.40.0 release.
3190 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3191 run tests.][63827] This should improve performance when running a large
3193 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3194 recommended to use the `?` operator instead.
3195 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3198 [62600]: https://github.com/rust-lang/rust/pull/62600/
3199 [62672]: https://github.com/rust-lang/rust/pull/62672/
3200 [63118]: https://github.com/rust-lang/rust/pull/63118/
3201 [63209]: https://github.com/rust-lang/rust/pull/63209/
3202 [63402]: https://github.com/rust-lang/rust/pull/63402/
3203 [63565]: https://github.com/rust-lang/rust/pull/63565/
3204 [63595]: https://github.com/rust-lang/rust/pull/63595/
3205 [63684]: https://github.com/rust-lang/rust/pull/63684/
3206 [63698]: https://github.com/rust-lang/rust/pull/63698/
3207 [63770]: https://github.com/rust-lang/rust/pull/63770/
3208 [63786]: https://github.com/rust-lang/rust/pull/63786/
3209 [63827]: https://github.com/rust-lang/rust/pull/63827/
3210 [63834]: https://github.com/rust-lang/rust/pull/63834/
3211 [64010]: https://github.com/rust-lang/rust/pull/64010/
3212 [64028]: https://github.com/rust-lang/rust/pull/64028/
3213 [64334]: https://github.com/rust-lang/rust/pull/64334/
3214 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3215 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3216 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3217 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3218 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3219 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3221 Version 1.38.0 (2019-09-26)
3222 ==========================
3226 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3227 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3231 - [Added pipelined compilation support to `rustc`.][62766] This will
3232 improve compilation times in some cases. For further information please refer
3233 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3234 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3235 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3236 `x86_64-uwp-windows-msvc` targets.][60260]
3237 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3238 `armv7-unknown-linux-musleabi` targets.][63107]
3239 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3240 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3241 - [Upgraded to LLVM 9.][62592]
3243 \* Refer to Rust's [platform support page][platform-support-doc] for more
3244 information on Rust's tiered platform support.
3248 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3249 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3250 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3251 is available at `std::clone::Clone`). This also makes all built-in macros
3252 available in `std`/`core` root. e.g. `std::include_bytes!`.
3253 - [`str::Chars` now implements `Debug`.][63000]
3254 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3255 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3256 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3257 - [Added euclidean remainder and division operations (`div_euclid`,
3258 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3259 `overflowing`, and `wrapping` versions are available for all
3261 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3262 `PartialEq`.][61491]
3263 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3267 - [`<*const T>::cast`]
3268 - [`<*mut T>::cast`]
3269 - [`Duration::as_secs_f32`]
3270 - [`Duration::as_secs_f64`]
3271 - [`Duration::div_f32`]
3272 - [`Duration::div_f64`]
3273 - [`Duration::from_secs_f32`]
3274 - [`Duration::from_secs_f64`]
3275 - [`Duration::mul_f32`]
3276 - [`Duration::mul_f64`]
3277 - [`any::type_name`]
3281 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3282 - [You can now pass the `--features` option multiple times to enable
3283 multiple features.][cargo/7084]
3288 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3292 - [`rustc` will now warn about some incorrect uses of
3293 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3297 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3299 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3300 issues][62896] with certain crates such as libc.
3302 [60260]: https://github.com/rust-lang/rust/pull/60260/
3303 [61457]: https://github.com/rust-lang/rust/pull/61457/
3304 [61491]: https://github.com/rust-lang/rust/pull/61491/
3305 [61884]: https://github.com/rust-lang/rust/pull/61884/
3306 [61953]: https://github.com/rust-lang/rust/pull/61953/
3307 [62042]: https://github.com/rust-lang/rust/pull/62042/
3308 [62528]: https://github.com/rust-lang/rust/pull/62528/
3309 [62583]: https://github.com/rust-lang/rust/pull/62583/
3310 [62735]: https://github.com/rust-lang/rust/pull/62735/
3311 [62766]: https://github.com/rust-lang/rust/pull/62766/
3312 [62784]: https://github.com/rust-lang/rust/pull/62784/
3313 [62592]: https://github.com/rust-lang/rust/pull/62592/
3314 [62785]: https://github.com/rust-lang/rust/issues/62785/
3315 [62814]: https://github.com/rust-lang/rust/pull/62814/
3316 [62896]: https://github.com/rust-lang/rust/issues/62896/
3317 [63000]: https://github.com/rust-lang/rust/pull/63000/
3318 [63056]: https://github.com/rust-lang/rust/pull/63056/
3319 [63107]: https://github.com/rust-lang/rust/pull/63107/
3320 [63346]: https://github.com/rust-lang/rust/pull/63346/
3321 [63421]: https://github.com/rust-lang/rust/pull/63421/
3322 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3323 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3324 [63048]: https://github.com/rust-lang/rust/pull/63048
3325 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3326 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3327 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3328 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3329 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3330 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3331 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3332 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3333 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3334 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3335 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3336 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3337 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3339 Version 1.37.0 (2019-08-15)
3340 ==========================
3344 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3345 [`Box`][62228], or an [array][62235] and unused.
3346 - [You can now use the `cfg` and `cfg_attr` attributes on
3347 generic parameters.][61547]
3348 - [You can now use enum variants through type alias.][61682] e.g. You can
3349 write the following:
3351 type MyOption = Option<u8>;
3353 fn increment_or_zero(x: MyOption) -> u8 {
3355 MyOption::Some(y) => y + 1,
3356 MyOption::None => 0,
3360 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3361 `const _: u32 = 5;`.
3362 - [You can now use `#[repr(align(X)]` on enums.][61229]
3363 - [The `?` Kleene macro operator is now available in the
3364 2015 edition.][60932]
3368 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3369 and `-C profile-use` flags.][61268] For more information on how to use profile
3370 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3371 - [The `rust-lldb` wrapper script should now work again.][61827]
3375 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3379 - [`BufReader::buffer`]
3380 - [`BufWriter::buffer`]
3381 - [`Cell::from_mut`]
3382 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3383 - [`DoubleEndedIterator::nth_back`]
3385 - [`Wrapping::reverse_bits`]
3386 - [`i128::reverse_bits`]
3387 - [`i16::reverse_bits`]
3388 - [`i32::reverse_bits`]
3389 - [`i64::reverse_bits`]
3390 - [`i8::reverse_bits`]
3391 - [`isize::reverse_bits`]
3392 - [`slice::copy_within`]
3393 - [`u128::reverse_bits`]
3394 - [`u16::reverse_bits`]
3395 - [`u32::reverse_bits`]
3396 - [`u64::reverse_bits`]
3397 - [`u8::reverse_bits`]
3398 - [`usize::reverse_bits`]
3402 - [`Cargo.lock` files are now included by default when publishing executable crates
3403 with executables.][cargo/7026]
3404 - [You can now specify `default-run="foo"` in `[package]` to specify the
3405 default executable to use for `cargo run`.][cargo/7056]
3412 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3413 Please transition your code to using the `..=` syntax for inclusive
3415 - [Using a trait object without the `dyn` will now warn by default.][61203]
3416 Please transition your code to use `dyn Trait` for trait objects instead.
3418 [62228]: https://github.com/rust-lang/rust/pull/62228/
3419 [62235]: https://github.com/rust-lang/rust/pull/62235/
3420 [61802]: https://github.com/rust-lang/rust/pull/61802/
3421 [61827]: https://github.com/rust-lang/rust/pull/61827/
3422 [61547]: https://github.com/rust-lang/rust/pull/61547/
3423 [61682]: https://github.com/rust-lang/rust/pull/61682/
3424 [61268]: https://github.com/rust-lang/rust/pull/61268/
3425 [61342]: https://github.com/rust-lang/rust/pull/61342/
3426 [61347]: https://github.com/rust-lang/rust/pull/61347/
3427 [61100]: https://github.com/rust-lang/rust/pull/61100/
3428 [61203]: https://github.com/rust-lang/rust/pull/61203/
3429 [61229]: https://github.com/rust-lang/rust/pull/61229/
3430 [60932]: https://github.com/rust-lang/rust/pull/60932/
3431 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3432 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3433 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3434 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3435 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3436 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3437 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3438 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3439 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3440 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3441 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3442 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3443 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3444 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3445 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3446 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3447 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3448 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3449 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3450 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3451 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3452 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3453 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3456 Version 1.36.0 (2019-07-04)
3457 ==========================
3461 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3462 - [The order of traits in trait objects no longer affects the semantics of that
3463 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3464 `dyn fmt::Debug + Send`, where this was previously not the case.
3468 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3469 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3470 - [`mem::needs_drop` is now available as a const fn.][60364]
3471 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3472 - [`String` now implements `BorrowMut<str>`.][60404]
3473 - [`io::Cursor` now implements `Default`.][60234]
3474 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3475 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3476 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3477 environment has access to heap memory allocation.
3478 - [`String` now implements `From<&String>`.][59825]
3479 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3480 return a tuple of each argument when there is multiple arguments.
3481 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3486 - [`VecDeque::rotate_left`]
3487 - [`VecDeque::rotate_right`]
3488 - [`Iterator::copied`]
3490 - [`io::IoSliceMut`]
3491 - [`Read::read_vectored`]
3492 - [`Write::write_vectored`]
3493 - [`str::as_mut_ptr`]
3494 - [`mem::MaybeUninit`]
3495 - [`pointer::align_offset`]
3496 - [`future::Future`]
3498 - [`task::RawWaker`]
3499 - [`task::RawWakerVTable`]
3505 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3506 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3508 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3512 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3519 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3520 longer recommended, and will be deprecated in 1.39.0.
3522 [60318]: https://github.com/rust-lang/rust/pull/60318/
3523 [60364]: https://github.com/rust-lang/rust/pull/60364/
3524 [60370]: https://github.com/rust-lang/rust/pull/60370/
3525 [60404]: https://github.com/rust-lang/rust/pull/60404/
3526 [60234]: https://github.com/rust-lang/rust/pull/60234/
3527 [60244]: https://github.com/rust-lang/rust/pull/60244/
3528 [58623]: https://github.com/rust-lang/rust/pull/58623/
3529 [59648]: https://github.com/rust-lang/rust/pull/59648/
3530 [59675]: https://github.com/rust-lang/rust/pull/59675/
3531 [59825]: https://github.com/rust-lang/rust/pull/59825/
3532 [59826]: https://github.com/rust-lang/rust/pull/59826/
3533 [59445]: https://github.com/rust-lang/rust/pull/59445/
3534 [59114]: https://github.com/rust-lang/rust/pull/59114/
3535 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3536 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3537 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3538 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3539 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3540 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3541 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3542 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3543 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3544 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3545 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3546 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3547 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3548 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3549 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3550 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3551 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3552 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3553 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3554 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3557 Version 1.35.0 (2019-05-23)
3558 ==========================
3562 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3563 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3564 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3566 unsafe fn call_unsafe(func: unsafe fn()) {
3571 unsafe { call_unsafe(|| {}); }
3578 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3579 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3580 - [Added the `wasm32-unknown-wasi` target.][59464]
3585 - [`Thread` will now show its ID in `Debug` output.][59460]
3586 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3587 - [`alloc::System` now implements `Default`.][59451]
3588 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3590 - [`char::{ToLowercase, ToUppercase}` now
3591 implement `ExactSizeIterator`.][58778]
3592 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3593 - [Removed the `Read` trait bounds
3594 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3595 - [You can now call the `dbg!` macro without any parameters to print the file
3596 and line where it is called.][57847]
3597 - [In place ASCII case conversions are now up to 4× faster.][59283]
3598 e.g. `str::make_ascii_lowercase`
3599 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3606 - [`RefCell::replace_with`]
3607 - [`RefCell::map_split`]
3609 - [`Range::contains`]
3610 - [`RangeFrom::contains`]
3611 - [`RangeTo::contains`]
3612 - [`RangeInclusive::contains`]
3613 - [`RangeToInclusive::contains`]
3614 - [`Option::copied`]
3618 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3619 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3624 - [The Rust toolchain is now available natively for musl based distros.][58575]
3626 [59460]: https://github.com/rust-lang/rust/pull/59460/
3627 [59464]: https://github.com/rust-lang/rust/pull/59464/
3628 [59500]: https://github.com/rust-lang/rust/pull/59500/
3629 [59512]: https://github.com/rust-lang/rust/pull/59512/
3630 [59580]: https://github.com/rust-lang/rust/pull/59580/
3631 [59283]: https://github.com/rust-lang/rust/pull/59283/
3632 [59451]: https://github.com/rust-lang/rust/pull/59451/
3633 [59076]: https://github.com/rust-lang/rust/pull/59076/
3634 [58778]: https://github.com/rust-lang/rust/pull/58778/
3635 [58717]: https://github.com/rust-lang/rust/pull/58717/
3636 [58369]: https://github.com/rust-lang/rust/pull/58369/
3637 [58423]: https://github.com/rust-lang/rust/pull/58423/
3638 [58080]: https://github.com/rust-lang/rust/pull/58080/
3639 [57847]: https://github.com/rust-lang/rust/pull/57847/
3640 [58575]: https://github.com/rust-lang/rust/pull/58575
3641 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3642 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3643 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3644 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3645 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3646 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3647 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3648 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3649 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3650 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3651 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3652 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3654 Version 1.34.2 (2019-05-14)
3655 ===========================
3657 * [Destabilize the `Error::type_id` function due to a security
3658 vulnerability][60785] ([CVE-2019-12083])
3660 [60785]: https://github.com/rust-lang/rust/pull/60785
3661 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3663 Version 1.34.1 (2019-04-25)
3664 ===========================
3666 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3667 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3668 * [Fix Clippy panic when checking some macros][clippy/3805]
3670 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3671 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3672 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3674 Version 1.34.0 (2019-04-11)
3675 ==========================
3679 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3680 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3682 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3683 `#[attr{}]` procedural macros.][57367]
3684 - [You can now write `extern crate self as foo;`][57407] to import your
3685 crate's root into the extern prelude.
3690 - [You can now target `riscv64imac-unknown-none-elf` and
3691 `riscv64gc-unknown-none-elf`.][58406]
3692 - [You can now enable linker plugin LTO optimisations with
3693 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3694 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3696 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3701 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3702 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3703 the `Hash` trait to create an iterator.
3704 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3705 methods.][58421] Most notably you no longer require the `Ord` trait to create
3707 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3708 for all numeric types.][58044]
3709 - [Indexing a `str` is now generic over all types that
3710 implement `SliceIndex<str>`.][57604]
3711 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3712 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3713 produce a warning if their returning type is unused.
3714 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3715 `overflowing_pow` are now available for all numeric types.][57873] These are
3716 equivalent to methods such as `wrapping_add` for the `pow` operation.
3724 * [`Error::type_id`]
3725 * [`atomic::AtomicI16`]
3726 * [`atomic::AtomicI32`]
3727 * [`atomic::AtomicI64`]
3728 * [`atomic::AtomicI8`]
3729 * [`atomic::AtomicU16`]
3730 * [`atomic::AtomicU32`]
3731 * [`atomic::AtomicU64`]
3732 * [`atomic::AtomicU8`]
3733 * [`convert::Infallible`]
3734 * [`convert::TryFrom`]
3735 * [`convert::TryInto`]
3737 * [`iter::successors`]
3738 * [`num::NonZeroI128`]
3739 * [`num::NonZeroI16`]
3740 * [`num::NonZeroI32`]
3741 * [`num::NonZeroI64`]
3742 * [`num::NonZeroI8`]
3743 * [`num::NonZeroIsize`]
3744 * [`slice::sort_by_cached_key`]
3745 * [`str::escape_debug`]
3746 * [`str::escape_default`]
3747 * [`str::escape_unicode`]
3748 * [`str::split_ascii_whitespace`]
3751 * [`Instant::checked_add`]
3752 * [`Instant::checked_sub`]
3753 * [`SystemTime::checked_add`]
3754 * [`SystemTime::checked_sub`]
3758 - [You can now use alternative registries to crates.io.][cargo/6654]
3762 - [You can now use the `?` operator in your documentation tests without manually
3763 adding `fn main() -> Result<(), _> {}`.][56470]
3767 - [`Command::before_exec` is being replaced by the unsafe method
3768 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3769 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3770 can now use `const` functions in `static` variables.
3772 [58370]: https://github.com/rust-lang/rust/pull/58370/
3773 [58406]: https://github.com/rust-lang/rust/pull/58406/
3774 [58421]: https://github.com/rust-lang/rust/pull/58421/
3775 [58166]: https://github.com/rust-lang/rust/pull/58166/
3776 [58044]: https://github.com/rust-lang/rust/pull/58044/
3777 [58057]: https://github.com/rust-lang/rust/pull/58057/
3778 [58059]: https://github.com/rust-lang/rust/pull/58059/
3779 [57809]: https://github.com/rust-lang/rust/pull/57809/
3780 [57873]: https://github.com/rust-lang/rust/pull/57873/
3781 [57604]: https://github.com/rust-lang/rust/pull/57604/
3782 [57367]: https://github.com/rust-lang/rust/pull/57367/
3783 [57407]: https://github.com/rust-lang/rust/pull/57407/
3784 [57425]: https://github.com/rust-lang/rust/pull/57425/
3785 [57106]: https://github.com/rust-lang/rust/pull/57106/
3786 [56470]: https://github.com/rust-lang/rust/pull/56470/
3787 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3788 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3789 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3790 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3791 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3792 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3793 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3794 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3795 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3796 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3797 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3798 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3799 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3800 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3801 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3802 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3803 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3804 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3805 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3806 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3807 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3808 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3809 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3810 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3811 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3812 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3813 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3814 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3815 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3816 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3817 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3820 Version 1.33.0 (2019-02-28)
3821 ==========================
3825 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3826 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3827 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3828 E.g. You can have match statement on a `u8` that covers `0..=255` and
3829 you would no longer be required to have a `_ => unreachable!()` case.
3830 - [You can now have multiple patterns in `if let` and `while let`
3831 expressions.][57532] You can do this with the same syntax as a `match`
3841 let state = Creature::Crab("Ferris");
3843 if let Creature::Crab(name) | Creature::Person(name) = state {
3844 println!("This creature's name is: {}", name);
3848 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3849 this feature will by default produce a warning as this behaviour can be
3850 unintuitive. E.g. `if let _ = 5 {}`
3851 - [You can now use `let` bindings, assignments, expression statements,
3852 and irrefutable pattern destructuring in const functions.][57175]
3853 - [You can now call unsafe const functions.][57067] E.g.
3855 const unsafe fn foo() -> i32 { 5 }
3856 const fn bar() -> i32 {
3860 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3861 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3862 - [You can now specify a specific alignment with the `#[repr(packed)]`
3863 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3864 with an alignment of 2 bytes and a size of 6 bytes.
3865 - [You can now import an item from a module as an `_`.][56303] This allows you to
3866 import a trait's impls, and not have the name in the namespace. E.g.
3868 use std::io::Read as _;
3870 // Allowed as there is only one `Read` in the module.
3873 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3877 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3878 command line argument.][56351]
3879 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3880 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3881 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3882 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3883 information on Rust's platform support.
3884 - [Added support for the `thumbv7neon-linux-androideabi` and
3885 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3886 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3890 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3891 functions for all numeric types.][57566]
3892 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3893 are now `const` functions for all numeric types.][57105]
3894 - [The methods `is_positive` and `is_negative` are now `const` functions for
3895 all signed numeric types.][57105]
3896 - [The `get` method for all `NonZero` types is now `const`.][57167]
3897 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3898 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3899 numeric types.][57234]
3900 - [`Ipv4Addr::new` is now a `const` function][57234]
3904 - [`unix::FileExt::read_exact_at`]
3905 - [`unix::FileExt::write_all_at`]
3906 - [`Option::transpose`]
3907 - [`Result::transpose`]
3908 - [`convert::identity`]
3911 - [`marker::PhantomPinned`]
3912 - [`Vec::resize_with`]
3913 - [`VecDeque::resize_with`]
3914 - [`Duration::as_millis`]
3915 - [`Duration::as_micros`]
3916 - [`Duration::as_nanos`]
3921 - [You can now publish crates that require a feature flag to compile with
3922 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3923 - [Cargo should now rebuild a crate if a file was modified during the initial
3928 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3929 are now deprecated in the standard library, and their usage will now produce a warning.
3930 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3932 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3934 - [Libtest no longer creates a new thread for each test when
3935 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3937 [56243]: https://github.com/rust-lang/rust/pull/56243
3938 [56303]: https://github.com/rust-lang/rust/pull/56303/
3939 [56351]: https://github.com/rust-lang/rust/pull/56351/
3940 [56362]: https://github.com/rust-lang/rust/pull/56362
3941 [56642]: https://github.com/rust-lang/rust/pull/56642/
3942 [56769]: https://github.com/rust-lang/rust/pull/56769/
3943 [56805]: https://github.com/rust-lang/rust/pull/56805
3944 [56947]: https://github.com/rust-lang/rust/pull/56947/
3945 [57049]: https://github.com/rust-lang/rust/pull/57049/
3946 [57067]: https://github.com/rust-lang/rust/pull/57067/
3947 [57105]: https://github.com/rust-lang/rust/pull/57105
3948 [57130]: https://github.com/rust-lang/rust/pull/57130/
3949 [57167]: https://github.com/rust-lang/rust/pull/57167/
3950 [57175]: https://github.com/rust-lang/rust/pull/57175/
3951 [57234]: https://github.com/rust-lang/rust/pull/57234/
3952 [57332]: https://github.com/rust-lang/rust/pull/57332/
3953 [57465]: https://github.com/rust-lang/rust/pull/57465/
3954 [57532]: https://github.com/rust-lang/rust/pull/57532/
3955 [57535]: https://github.com/rust-lang/rust/pull/57535/
3956 [57566]: https://github.com/rust-lang/rust/pull/57566/
3957 [57615]: https://github.com/rust-lang/rust/pull/57615/
3958 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3959 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3960 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3961 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3962 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3963 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3964 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3965 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3966 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3967 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3968 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3969 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3970 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3971 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3972 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3973 [platform-support]: https://forge.rust-lang.org/platform-support.html
3975 Version 1.32.0 (2019-01-17)
3976 ==========================
3981 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3982 operator allows you to specify zero or one repetitions similar to the `*` and
3984 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3985 now always resolve to the item (`enum`, `struct`, etc.) available in the
3986 module if present, before resolving to a external crate or an item the prelude.][56759]
3989 enum Color { Red, Green, Blue }
3995 - [You can now match against `PhantomData<T>` types.][55837]
3996 - [You can now match against literals in macros with the `literal`
3997 specifier.][56072] This will match against a literal of any type.
3998 E.g. `1`, `'A'`, `"Hello World"`
3999 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4001 struct Point(i32, i32);
4004 pub fn new(x: i32, y: i32) -> Self {
4008 pub fn is_origin(&self) -> bool {
4016 - [Self can also now be used in type definitions.][56366] E.g.
4020 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4023 Cons(T, Box<Self>) // likewise here
4026 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4027 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4031 - [The default allocator has changed from jemalloc to the default allocator on
4032 your system.][55238] The compiler itself on Linux & macOS will still use
4033 jemalloc, but programs compiled with it will use the system allocator.
4034 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4038 - [`PathBuf` now implements `FromStr`.][55148]
4039 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4040 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4041 easily debug expressions in your rust program. E.g.
4044 let b = dbg!(a * 2) + 1;
4045 // ^-- prints: [src/main.rs:4] a * 2 = 4
4049 The following APIs are now `const` functions and can be used in a
4053 - [`UnsafeCell::get`]
4054 - [`char::is_ascii`]
4056 - [`ManuallyDrop::new`]
4057 - [`ManuallyDrop::into_inner`]
4058 - [`RangeInclusive::start`]
4059 - [`RangeInclusive::end`]
4060 - [`NonNull::as_ptr`]
4063 - [`Duration::as_secs`]
4064 - [`Duration::subsec_millis`]
4065 - [`Duration::subsec_micros`]
4066 - [`Duration::subsec_nanos`]
4068 - [`Ipv4Addr::is_unspecified`]
4070 - [`Ipv6Addr::octets`]
4074 - [`i8::to_be_bytes`]
4075 - [`i8::to_le_bytes`]
4076 - [`i8::to_ne_bytes`]
4077 - [`i8::from_be_bytes`]
4078 - [`i8::from_le_bytes`]
4079 - [`i8::from_ne_bytes`]
4080 - [`i16::to_be_bytes`]
4081 - [`i16::to_le_bytes`]
4082 - [`i16::to_ne_bytes`]
4083 - [`i16::from_be_bytes`]
4084 - [`i16::from_le_bytes`]
4085 - [`i16::from_ne_bytes`]
4086 - [`i32::to_be_bytes`]
4087 - [`i32::to_le_bytes`]
4088 - [`i32::to_ne_bytes`]
4089 - [`i32::from_be_bytes`]
4090 - [`i32::from_le_bytes`]
4091 - [`i32::from_ne_bytes`]
4092 - [`i64::to_be_bytes`]
4093 - [`i64::to_le_bytes`]
4094 - [`i64::to_ne_bytes`]
4095 - [`i64::from_be_bytes`]
4096 - [`i64::from_le_bytes`]
4097 - [`i64::from_ne_bytes`]
4098 - [`i128::to_be_bytes`]
4099 - [`i128::to_le_bytes`]
4100 - [`i128::to_ne_bytes`]
4101 - [`i128::from_be_bytes`]
4102 - [`i128::from_le_bytes`]
4103 - [`i128::from_ne_bytes`]
4104 - [`isize::to_be_bytes`]
4105 - [`isize::to_le_bytes`]
4106 - [`isize::to_ne_bytes`]
4107 - [`isize::from_be_bytes`]
4108 - [`isize::from_le_bytes`]
4109 - [`isize::from_ne_bytes`]
4110 - [`u8::to_be_bytes`]
4111 - [`u8::to_le_bytes`]
4112 - [`u8::to_ne_bytes`]
4113 - [`u8::from_be_bytes`]
4114 - [`u8::from_le_bytes`]
4115 - [`u8::from_ne_bytes`]
4116 - [`u16::to_be_bytes`]
4117 - [`u16::to_le_bytes`]
4118 - [`u16::to_ne_bytes`]
4119 - [`u16::from_be_bytes`]
4120 - [`u16::from_le_bytes`]
4121 - [`u16::from_ne_bytes`]
4122 - [`u32::to_be_bytes`]
4123 - [`u32::to_le_bytes`]
4124 - [`u32::to_ne_bytes`]
4125 - [`u32::from_be_bytes`]
4126 - [`u32::from_le_bytes`]
4127 - [`u32::from_ne_bytes`]
4128 - [`u64::to_be_bytes`]
4129 - [`u64::to_le_bytes`]
4130 - [`u64::to_ne_bytes`]
4131 - [`u64::from_be_bytes`]
4132 - [`u64::from_le_bytes`]
4133 - [`u64::from_ne_bytes`]
4134 - [`u128::to_be_bytes`]
4135 - [`u128::to_le_bytes`]
4136 - [`u128::to_ne_bytes`]
4137 - [`u128::from_be_bytes`]
4138 - [`u128::from_le_bytes`]
4139 - [`u128::from_ne_bytes`]
4140 - [`usize::to_be_bytes`]
4141 - [`usize::to_le_bytes`]
4142 - [`usize::to_ne_bytes`]
4143 - [`usize::from_be_bytes`]
4144 - [`usize::from_le_bytes`]
4145 - [`usize::from_ne_bytes`]
4149 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4150 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4154 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4158 - [The argument types for AVX's
4159 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4160 been changed from `*const` to `*mut` as the previous implementation
4164 [55148]: https://github.com/rust-lang/rust/pull/55148/
4165 [55238]: https://github.com/rust-lang/rust/pull/55238/
4166 [55280]: https://github.com/rust-lang/rust/pull/55280/
4167 [55610]: https://github.com/rust-lang/rust/pull/55610/
4168 [55663]: https://github.com/rust-lang/rust/pull/55663/
4169 [55702]: https://github.com/rust-lang/rust/pull/55702/
4170 [55837]: https://github.com/rust-lang/rust/pull/55837/
4171 [55843]: https://github.com/rust-lang/rust/pull/55843/
4172 [56072]: https://github.com/rust-lang/rust/pull/56072/
4173 [56245]: https://github.com/rust-lang/rust/pull/56245/
4174 [56365]: https://github.com/rust-lang/rust/pull/56365/
4175 [56366]: https://github.com/rust-lang/rust/pull/56366/
4176 [56395]: https://github.com/rust-lang/rust/pull/56395/
4177 [56759]: https://github.com/rust-lang/rust/pull/56759/
4178 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4179 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4180 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4181 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4182 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4183 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4184 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4185 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4186 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4187 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4188 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4189 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4190 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4191 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4192 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4193 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4194 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4195 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4196 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4197 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4198 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4199 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4200 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4201 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4202 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4203 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4204 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4205 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4206 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4207 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4208 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4209 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4210 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4211 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4212 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4213 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4214 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4215 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4216 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4217 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4218 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4219 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4220 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4221 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4222 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4223 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4224 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4225 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4226 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4227 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4228 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4229 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4230 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4231 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4232 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4233 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4234 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4235 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4236 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4237 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4238 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4239 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4240 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4241 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4242 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4243 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4244 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4245 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4246 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4247 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4248 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4249 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4250 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4251 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4252 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4253 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4254 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4255 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4256 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4257 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4258 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4259 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4260 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4261 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4262 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4263 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4264 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4265 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4266 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4267 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4268 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4269 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4270 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4273 Version 1.31.1 (2018-12-20)
4274 ===========================
4276 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4277 - [Fix broken go-to-definition in RLS][rls/1171]
4278 - [Fix infinite loop on hover in RLS][rls/1170]
4280 [56562]: https://github.com/rust-lang/rust/pull/56562
4281 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4282 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4284 Version 1.31.0 (2018-12-06)
4285 ==========================
4289 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4290 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4291 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4292 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4294 - [You can now define and use `const` functions.][54835] These are currently
4295 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4296 [language reference][const-reference] for what exactly is available.
4297 - [You can now use tool lints, which allow you to scope lints from external
4298 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4299 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4300 a crate, not just in exported functions.][54451]
4301 - [You can now use parentheses in pattern matches.][54497]
4305 - [Updated musl to 1.1.20][54430]
4309 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4310 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4311 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4312 into `Option<&mut T>` using the `From` trait.][53218]
4313 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4318 - [`slice::align_to`]
4319 - [`slice::align_to_mut`]
4320 - [`slice::chunks_exact`]
4321 - [`slice::chunks_exact_mut`]
4322 - [`slice::rchunks`]
4323 - [`slice::rchunks_mut`]
4324 - [`slice::rchunks_exact`]
4325 - [`slice::rchunks_exact_mut`]
4326 - [`Option::replace`]
4330 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4331 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4332 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4334 [52813]: https://github.com/rust-lang/rust/pull/52813/
4335 [53218]: https://github.com/rust-lang/rust/pull/53218/
4336 [54057]: https://github.com/rust-lang/rust/pull/54057/
4337 [54240]: https://github.com/rust-lang/rust/pull/54240/
4338 [54430]: https://github.com/rust-lang/rust/pull/54430/
4339 [54451]: https://github.com/rust-lang/rust/pull/54451/
4340 [54497]: https://github.com/rust-lang/rust/pull/54497/
4341 [54778]: https://github.com/rust-lang/rust/pull/54778/
4342 [54835]: https://github.com/rust-lang/rust/pull/54835/
4343 [54870]: https://github.com/rust-lang/rust/pull/54870/
4344 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4345 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4346 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4347 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4348 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4349 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4350 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4351 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4352 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4353 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4354 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4355 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4356 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4357 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4359 Version 1.30.1 (2018-11-08)
4360 ===========================
4362 - [Fixed overflow ICE in rustdoc][54199]
4363 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4365 [54199]: https://github.com/rust-lang/rust/pull/54199
4366 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4368 Version 1.30.0 (2018-10-25)
4369 ==========================
4373 - [Procedural macros are now available.][52081] These kinds of macros allow for
4374 more powerful code generation. There is a [new chapter available][proc-macros]
4375 in the Rust Programming Language book that goes further in depth.
4376 - [You can now use keywords as identifiers using the raw identifiers
4377 syntax (`r#`),][53236] e.g. `let r#for = true;`
4378 - [Using anonymous parameters in traits is now deprecated with a warning and
4379 will be a hard error in the 2018 edition.][53272]
4380 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4381 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4382 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4383 Previously, using a external crate in a module without a use statement
4384 required `let json = ::serde_json::from_str(foo);` but can now be written
4385 as `let json = serde_json::from_str(foo);`.
4386 - [You can now apply the `#[used]` attribute to static items to prevent the
4387 compiler from optimising them away, even if they appear to be unused,][51363]
4388 e.g. `#[used] static FOO: u32 = 1;`
4389 - [You can now import and reexport macros from other crates with the `use`
4390 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4391 the root module of the crate. If your macro relies on calling other local
4392 macros, it is recommended to export with the
4393 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4395 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4396 using the `vis` specifier.][53370]
4397 - [Non-macro attributes now allow all forms of literals, not just
4398 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4399 write `#[attr(true)]`.
4400 - [You can now specify a function to handle a panic in the Rust runtime with the
4401 `#[panic_handler]` attribute.][51366]
4405 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4406 - [Added the `aarch64-unknown-netbsd` target][53165]
4407 - [Upgraded to LLVM 8.][53611]
4411 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4415 - [`Ipv4Addr::BROADCAST`]
4416 - [`Ipv4Addr::LOCALHOST`]
4417 - [`Ipv4Addr::UNSPECIFIED`]
4418 - [`Ipv6Addr::LOCALHOST`]
4419 - [`Ipv6Addr::UNSPECIFIED`]
4420 - [`Iterator::find_map`]
4422 The following methods are replacement methods for `trim_left`, `trim_right`,
4423 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4425 - [`str::trim_end_matches`]
4427 - [`str::trim_start_matches`]
4428 - [`str::trim_start`]
4432 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4433 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4434 equivalent to calling `rustdoc --error-format=json`.
4435 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4439 - [`rustdoc` allows you to specify what edition to treat your code as with the
4440 `--edition` option.][54057]
4441 - [`rustdoc` now has the `--color` (specify whether to output color) and
4442 `--error-format` (specify error format, e.g. `json`) options.][53003]
4443 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4444 debug symbols.][53774]
4445 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4446 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4448 [50911]: https://github.com/rust-lang/rust/pull/50911/
4449 [51363]: https://github.com/rust-lang/rust/pull/51363/
4450 [51366]: https://github.com/rust-lang/rust/pull/51366/
4451 [52081]: https://github.com/rust-lang/rust/pull/52081/
4452 [53003]: https://github.com/rust-lang/rust/pull/53003/
4453 [53033]: https://github.com/rust-lang/rust/pull/53033/
4454 [53044]: https://github.com/rust-lang/rust/pull/53044/
4455 [53165]: https://github.com/rust-lang/rust/pull/53165/
4456 [53611]: https://github.com/rust-lang/rust/pull/53611/
4457 [53236]: https://github.com/rust-lang/rust/pull/53236/
4458 [53272]: https://github.com/rust-lang/rust/pull/53272/
4459 [53370]: https://github.com/rust-lang/rust/pull/53370/
4460 [53459]: https://github.com/rust-lang/rust/pull/53459/
4461 [53774]: https://github.com/rust-lang/rust/pull/53774/
4462 [53822]: https://github.com/rust-lang/rust/pull/53822/
4463 [54057]: https://github.com/rust-lang/rust/pull/54057/
4464 [54404]: https://github.com/rust-lang/rust/pull/54404/
4465 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4466 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4467 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4468 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4470 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4471 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4472 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4473 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4474 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4475 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4476 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4477 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4478 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4479 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4482 Version 1.29.2 (2018-10-11)
4483 ===========================
4485 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4486 - The `rls-preview` component on the windows-gnu targets has been restored.
4488 [54639]: https://github.com/rust-lang/rust/pull/54639
4491 Version 1.29.1 (2018-09-25)
4492 ===========================
4497 - The standard library's `str::repeat` function contained an out of bounds write
4498 caused by an integer overflow. This has been fixed by deterministically
4499 panicking when an overflow happens.
4501 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4505 Version 1.29.0 (2018-09-13)
4506 ==========================
4510 - [Bumped minimum LLVM version to 5.0.][51899]
4511 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4512 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4513 - [Upgraded to LLVM 7.][51966]
4517 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4518 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4519 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4520 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4522 - [`Cell<T>` now allows `T` to be unsized.][50494]
4523 - [`SocketAddr` is now stable on Redox.][52656]
4528 - [`Iterator::flatten`]
4533 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4534 `--locked` to disable this behavior.
4535 - [`cargo-install` will now allow you to cross compile an install
4536 using `--target`.][cargo/5614]
4537 - [Added the `cargo-fix` subcommand to automatically move project code from
4538 2015 edition to 2018.][cargo/5723]
4539 - [`cargo doc` can now optionally document private types using the
4540 `--document-private-items` flag.][cargo/5543]
4544 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4545 the specified level to that level.][52354] For example `--cap-lints warn`
4546 will demote `deny` and `forbid` lints to `warn`.
4547 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4548 fails and `101` if there is a panic.][52197]
4549 - [A preview of clippy has been made available through rustup.][51122]
4550 You can install the preview with `rustup component add clippy-preview`.
4554 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4555 Use `str::get_unchecked(begin..end)` instead.
4556 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4557 Consider using the `home_dir` function from
4558 https://crates.io/crates/dirs instead.
4559 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4560 - [`cfg` attributes and `--cfg` command line flags are now more
4561 strictly validated.][53893]
4563 [53893]: https://github.com/rust-lang/rust/pull/53893/
4564 [52861]: https://github.com/rust-lang/rust/pull/52861/
4565 [51966]: https://github.com/rust-lang/rust/pull/51966/
4566 [52656]: https://github.com/rust-lang/rust/pull/52656/
4567 [52239]: https://github.com/rust-lang/rust/pull/52239/
4568 [52330]: https://github.com/rust-lang/rust/pull/52330/
4569 [52354]: https://github.com/rust-lang/rust/pull/52354/
4570 [52402]: https://github.com/rust-lang/rust/pull/52402/
4571 [52197]: https://github.com/rust-lang/rust/pull/52197/
4572 [51807]: https://github.com/rust-lang/rust/pull/51807/
4573 [51899]: https://github.com/rust-lang/rust/pull/51899/
4574 [51912]: https://github.com/rust-lang/rust/pull/51912/
4575 [51619]: https://github.com/rust-lang/rust/pull/51619/
4576 [51656]: https://github.com/rust-lang/rust/pull/51656/
4577 [51178]: https://github.com/rust-lang/rust/pull/51178/
4578 [51122]: https://github.com/rust-lang/rust/pull/51122
4579 [50494]: https://github.com/rust-lang/rust/pull/50494/
4580 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4581 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4582 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4583 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4584 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4585 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4586 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4589 Version 1.28.0 (2018-08-02)
4590 ===========================
4594 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4595 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4596 the inner type across Foreign Function Interface (FFI) boundaries.
4597 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4598 and can now be used as identifiers.][51196]
4599 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4600 stable.][51241] This will allow users to specify a global allocator for
4602 - [Unit test functions marked with the `#[test]` attribute can now return
4603 `Result<(), E: Debug>` in addition to `()`.][51298]
4604 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4605 allows macros to easily target lifetimes.
4609 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4610 prioritise making smaller binary sizes. `z` is the same as `s` with the
4611 exception that it does not vectorise loops, which typically results in an even
4613 - [The short error format is now stable.][49546] Specified with
4614 `--error-format=short` this option will provide a more compressed output of
4615 rust error messages.
4616 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4617 - [Reduced the number of allocations in the macro parser.][50855] This can
4618 improve compile times of macro heavy crates on average by 5%.
4622 - [Implemented `Default` for `&mut str`.][51306]
4623 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4624 - [Implemented `Extend` for `()`.][50234]
4625 - [The `Debug` implementation of `time::Duration` should now be more easily
4626 human readable.][50364] Previously a `Duration` of one second would printed as
4627 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4628 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4629 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4630 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4631 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4632 for `PathBuf`.][50170]
4633 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4634 and `Wrapping<i128>`.][50465]
4635 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4636 possible.][51050] This can provide up to a 40% speed increase.
4637 - [Improved error messages when using `format!`.][50610]
4641 - [`Iterator::step_by`]
4642 - [`Path::ancestors`]
4643 - [`SystemTime::UNIX_EPOCH`]
4644 - [`alloc::GlobalAlloc`]
4646 - [`alloc::LayoutErr`]
4649 - [`alloc::alloc_zeroed`]
4650 - [`alloc::dealloc`]
4651 - [`alloc::realloc`]
4652 - [`alloc::handle_alloc_error`]
4653 - [`btree_map::Entry::or_default`]
4654 - [`fmt::Alignment`]
4655 - [`hash_map::Entry::or_default`]
4656 - [`iter::repeat_with`]
4657 - [`num::NonZeroUsize`]
4658 - [`num::NonZeroU128`]
4659 - [`num::NonZeroU16`]
4660 - [`num::NonZeroU32`]
4661 - [`num::NonZeroU64`]
4662 - [`num::NonZeroU8`]
4663 - [`ops::RangeBounds`]
4664 - [`slice::SliceIndex`]
4665 - [`slice::from_mut`]
4666 - [`slice::from_ref`]
4667 - [`{Any + Send + Sync}::downcast_mut`]
4668 - [`{Any + Send + Sync}::downcast_ref`]
4669 - [`{Any + Send + Sync}::is`]
4673 - [Cargo will now no longer allow you to publish crates with build scripts that
4674 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4675 considered to be immutable.
4679 - [The `suggestion_applicability` field in `rustc`'s json output is now
4680 stable.][50486] This will allow dev tools to check whether a code suggestion
4681 would apply to them.
4685 - [Rust will consider trait objects with duplicated constraints to be the same
4686 type as without the duplicated constraint.][51276] For example the below code will
4687 now fail to compile.
4692 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4695 impl Trait + Send + Send {
4696 fn test(&self) { println!("two"); }
4700 [49546]: https://github.com/rust-lang/rust/pull/49546/
4701 [50143]: https://github.com/rust-lang/rust/pull/50143/
4702 [50170]: https://github.com/rust-lang/rust/pull/50170/
4703 [50234]: https://github.com/rust-lang/rust/pull/50234/
4704 [50265]: https://github.com/rust-lang/rust/pull/50265/
4705 [50364]: https://github.com/rust-lang/rust/pull/50364/
4706 [50385]: https://github.com/rust-lang/rust/pull/50385/
4707 [50465]: https://github.com/rust-lang/rust/pull/50465/
4708 [50486]: https://github.com/rust-lang/rust/pull/50486/
4709 [50554]: https://github.com/rust-lang/rust/pull/50554/
4710 [50610]: https://github.com/rust-lang/rust/pull/50610/
4711 [50855]: https://github.com/rust-lang/rust/pull/50855/
4712 [51050]: https://github.com/rust-lang/rust/pull/51050/
4713 [51196]: https://github.com/rust-lang/rust/pull/51196/
4714 [51241]: https://github.com/rust-lang/rust/pull/51241/
4715 [51276]: https://github.com/rust-lang/rust/pull/51276/
4716 [51298]: https://github.com/rust-lang/rust/pull/51298/
4717 [51306]: https://github.com/rust-lang/rust/pull/51306/
4718 [51562]: https://github.com/rust-lang/rust/pull/51562/
4719 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4720 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4721 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4722 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4723 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4724 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4725 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4726 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4727 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4728 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4729 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4730 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4731 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4732 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4733 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4734 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4735 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4736 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4737 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4738 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4739 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4740 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4741 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4742 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4743 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4744 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4745 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4746 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4747 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4748 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4750 Version 1.27.2 (2018-07-20)
4751 ===========================
4756 - The borrow checker was fixed to avoid potential unsoundness when using
4757 match ergonomics: [#52213][52213].
4759 [52213]: https://github.com/rust-lang/rust/issues/52213
4761 Version 1.27.1 (2018-07-10)
4762 ===========================
4767 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4768 when running, which enabled executing code as some other user on a
4769 given machine. This release fixes that vulnerability; you can read
4770 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4772 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4777 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4778 match ergonomics: [#51415][51415], [#49534][49534].
4780 [51415]: https://github.com/rust-lang/rust/issues/51415
4781 [49534]: https://github.com/rust-lang/rust/issues/49534
4782 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4783 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4785 Version 1.27.0 (2018-06-21)
4786 ==========================
4790 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4791 be used as an identifier.
4792 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4793 bare `Trait` syntax, and should make it clearer when being used in tandem with
4794 `impl Trait` because it is equivalent to the following syntax:
4795 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4796 `Box<Trait> == Box<dyn Trait>`.
4797 - [Attributes on generic parameters such as types and lifetimes are
4798 now stable.][48851] e.g.
4799 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4800 - [The `#[must_use]` attribute can now also be used on functions as well as
4801 types.][48925] It provides a lint that by default warns users when the
4802 value returned by a function has not been used.
4806 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4810 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4811 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4812 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4813 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4814 the `cfg` attribute.
4815 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4816 std are now available in core.][49896]
4817 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4819 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4820 that the operation isn't done in place.
4821 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4822 the `#[must_use]` attribute][49533] to warn about unused potentially
4823 expensive allocations.
4827 - [`DoubleEndedIterator::rfind`]
4828 - [`DoubleEndedIterator::rfold`]
4829 - [`DoubleEndedIterator::try_rfold`]
4830 - [`Duration::from_micros`]
4831 - [`Duration::from_nanos`]
4832 - [`Duration::subsec_micros`]
4833 - [`Duration::subsec_millis`]
4834 - [`HashMap::remove_entry`]
4835 - [`Iterator::try_fold`]
4836 - [`Iterator::try_for_each`]
4838 - [`Option::filter`]
4839 - [`String::replace_range`]
4840 - [`Take::set_limit`]
4841 - [`hint::unreachable_unchecked`]
4842 - [`os::unix::process::parent_id`]
4843 - [`ptr::swap_nonoverlapping`]
4844 - [`slice::rsplit_mut`]
4846 - [`slice::swap_with_slice`]
4850 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4851 `readme`, and `repository` fields.][cargo/5386]
4852 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4853 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4854 a different directory than `target` for placing compilation artifacts.
4855 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4856 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4857 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4858 where cargo would infer a binary, Cargo will produce a warning. You can
4859 disable this feature ahead of time by setting any of the following to false:
4860 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4861 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4862 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4866 - [Added “The Rustc book” into the official documentation.][49707]
4867 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4868 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4872 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4873 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4874 compile, `"".is_empty()` will still compile.
4875 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4876 will only print the inner type.][48553] E.g.
4877 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4878 not `AtomicBool(true)`.
4879 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4880 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4881 alignment should cover all use cases.
4882 - The `.description()` method on the `std::error::Error` trait
4883 [has been soft-deprecated][50163]. It is no longer required to implement it.
4885 [48553]: https://github.com/rust-lang/rust/pull/48553/
4886 [48851]: https://github.com/rust-lang/rust/pull/48851/
4887 [48925]: https://github.com/rust-lang/rust/pull/48925/
4888 [49533]: https://github.com/rust-lang/rust/pull/49533/
4889 [49623]: https://github.com/rust-lang/rust/pull/49623/
4890 [49630]: https://github.com/rust-lang/rust/pull/49630/
4891 [49664]: https://github.com/rust-lang/rust/pull/49664/
4892 [49699]: https://github.com/rust-lang/rust/pull/49699/
4893 [49707]: https://github.com/rust-lang/rust/pull/49707/
4894 [49896]: https://github.com/rust-lang/rust/pull/49896/
4895 [49968]: https://github.com/rust-lang/rust/pull/49968/
4896 [50163]: https://github.com/rust-lang/rust/pull/50163
4897 [50177]: https://github.com/rust-lang/rust/pull/50177/
4898 [50378]: https://github.com/rust-lang/rust/pull/50378/
4899 [50423]: https://github.com/rust-lang/rust/pull/50423/
4900 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4901 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4902 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4903 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4904 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4905 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4906 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4907 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4908 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4909 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4910 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4911 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4912 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4913 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4914 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4915 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4916 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4917 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4918 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4919 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4920 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4921 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4922 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4923 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4924 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4925 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4926 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4927 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4928 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4931 Version 1.26.2 (2018-06-05)
4932 ==========================
4937 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4939 [51117]: https://github.com/rust-lang/rust/issues/51117
4942 Version 1.26.1 (2018-05-29)
4943 ==========================
4948 - [RLS now works on Windows.][50646]
4949 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4955 - [`fn main() -> impl Trait` no longer works for non-Termination
4957 This reverts an accidental stabilization.
4958 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4959 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4961 [50646]: https://github.com/rust-lang/rust/issues/50646
4962 [50656]: https://github.com/rust-lang/rust/pull/50656
4963 [50812]: https://github.com/rust-lang/rust/pull/50812
4964 [50950]: https://github.com/rust-lang/rust/issues/50950
4965 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4967 Version 1.26.0 (2018-05-10)
4968 ==========================
4972 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4973 implement either or both traits.][49299]
4974 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4975 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4976 lifetime can be elided.][49458]
4977 - [`impl Trait` is now stable allowing you to have abstract types in returns
4978 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4979 `fn open(path: impl AsRef<Path>)`.
4980 - [Pattern matching will now automatically apply dereferences.][49394]
4981 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4982 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4983 - [A lot of operations are now available in a const context.][46882] E.g. You
4984 can now index into constant arrays, reference and dereference into constants,
4985 and use tuple struct constructors.
4986 - [Fixed entry slice patterns are now stable.][48516] E.g.
4988 let points = [1, 2, 3, 4];
4990 [1, 2, 3, 4] => println!("All points were sequential."),
4991 _ => println!("Not all points were sequential."),
4998 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4999 - [Fixed exponential projection complexity on nested types.][48296]
5000 This can provide up to a ~12% reduction in compile times for certain crates.
5001 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5002 to remap path prefixes outputted by the compiler.
5003 - [Added `powerpc-unknown-netbsd` target.][48281]
5007 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5008 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5009 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5010 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5011 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5012 - [`ascii::escape_default` is now available in libcore.][48735]
5013 - [Trailing commas are now supported in std and core macros.][48056]
5014 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5015 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5020 - [`*const T::copy_to_nonoverlapping`]
5021 - [`*const T::copy_to`]
5022 - [`*const T::read_unaligned`]
5023 - [`*const T::read_volatile`]
5024 - [`*const T::read`]
5026 - [`*const T::wrapping_add`]
5027 - [`*const T::wrapping_sub`]
5029 - [`*mut T::copy_to_nonoverlapping`]
5030 - [`*mut T::copy_to`]
5031 - [`*mut T::read_unaligned`]
5032 - [`*mut T::read_volatile`]
5034 - [`*mut T::replace`]
5037 - [`*mut T::wrapping_add`]
5038 - [`*mut T::wrapping_sub`]
5039 - [`*mut T::write_bytes`]
5040 - [`*mut T::write_unaligned`]
5041 - [`*mut T::write_volatile`]
5044 - [`FromUtf8Error::as_bytes`]
5045 - [`LocalKey::try_with`]
5046 - [`Option::cloned`]
5047 - [`btree_map::Entry::and_modify`]
5048 - [`fs::read_to_string`]
5051 - [`hash_map::Entry::and_modify`]
5052 - [`iter::FusedIterator`]
5053 - [`ops::RangeInclusive`]
5054 - [`ops::RangeToInclusive`]
5056 - [`slice::rotate_left`]
5057 - [`slice::rotate_right`]
5058 - [`String::retain`]
5063 - [Cargo will now output path to custom commands when `-v` is
5064 passed with `--list`][cargo/5041]
5065 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5069 - [The second edition of "The Rust Programming Language" book is now recommended
5070 over the first.][48404]
5075 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5076 syntax is now invalid.
5078 use std::ops::Fn as dyn;
5079 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5081 - [The result of dereferences are no longer promoted to `'static`.][47408]
5085 const PAIR: &(i32, i32) = &(0, 1);
5086 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5089 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5090 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5092 - [Removed hoedown from rustdoc.][48274]
5093 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5095 [46882]: https://github.com/rust-lang/rust/pull/46882
5096 [47379]: https://github.com/rust-lang/rust/pull/47379
5097 [47408]: https://github.com/rust-lang/rust/pull/47408
5098 [47813]: https://github.com/rust-lang/rust/pull/47813
5099 [48056]: https://github.com/rust-lang/rust/pull/48056
5100 [48125]: https://github.com/rust-lang/rust/pull/48125
5101 [48235]: https://github.com/rust-lang/rust/pull/48235
5102 [48274]: https://github.com/rust-lang/rust/pull/48274
5103 [48281]: https://github.com/rust-lang/rust/pull/48281
5104 [48296]: https://github.com/rust-lang/rust/pull/48296
5105 [48326]: https://github.com/rust-lang/rust/pull/48326
5106 [48359]: https://github.com/rust-lang/rust/pull/48359
5107 [48404]: https://github.com/rust-lang/rust/pull/48404
5108 [48481]: https://github.com/rust-lang/rust/pull/48481
5109 [48516]: https://github.com/rust-lang/rust/pull/48516
5110 [48628]: https://github.com/rust-lang/rust/pull/48628
5111 [48629]: https://github.com/rust-lang/rust/pull/48629
5112 [48657]: https://github.com/rust-lang/rust/pull/48657
5113 [48735]: https://github.com/rust-lang/rust/pull/48735
5114 [48978]: https://github.com/rust-lang/rust/pull/48978
5115 [49101]: https://github.com/rust-lang/rust/pull/49101
5116 [49109]: https://github.com/rust-lang/rust/pull/49109
5117 [49162]: https://github.com/rust-lang/rust/pull/49162
5118 [49255]: https://github.com/rust-lang/rust/pull/49255
5119 [49299]: https://github.com/rust-lang/rust/pull/49299
5120 [49305]: https://github.com/rust-lang/rust/pull/49305
5121 [49394]: https://github.com/rust-lang/rust/pull/49394
5122 [49458]: https://github.com/rust-lang/rust/pull/49458
5123 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5124 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5125 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5126 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5127 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5128 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5129 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5130 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5131 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5132 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5133 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5134 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5135 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5136 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5137 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5138 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5139 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5140 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5141 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5142 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5143 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5144 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5145 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5146 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5147 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5148 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5149 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5150 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5151 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5152 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5153 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5154 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5155 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5156 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5157 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5158 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5159 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5160 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5161 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5162 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5163 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5164 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5167 Version 1.25.0 (2018-03-29)
5168 ==========================
5172 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5173 - [You can now use nested groups of imports.][47948]
5174 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5175 - [You can now have `|` at the start of a match arm.][47947] e.g.
5177 enum Foo { A, B, C }
5183 | Foo::B => println!("AB"),
5184 | Foo::C => println!("C"),
5191 - [Upgraded to LLVM 6.][47828]
5192 - [Added `-C lto=val` option.][47521]
5193 - [Added `i586-unknown-linux-musl` target][47282]
5197 - [Impl Send for `process::Command` on Unix.][47760]
5198 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5199 - [`UnsafeCell::into_inner` is now safe.][47204]
5200 - [Implement libstd for CloudABI.][47268]
5201 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5202 - [Implement `AsRef<Path>` for Component][46985]
5203 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5204 - [Moved `Duration` to libcore.][46666]
5208 - [`Location::column`]
5211 The following functions can now be used in a constant expression.
5212 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5213 - [`Duration::new`][47300]
5214 - [`Duration::from_secs`][47300]
5215 - [`Duration::from_millis`][47300]
5219 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5220 - [`cargo new` now defaults to creating a binary crate, instead of a
5221 library crate.][cargo/5029]
5225 - [Rust by example is now shipped with new releases][46196]
5229 - [Deprecated `net::lookup_host`.][47510]
5230 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5231 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5232 around indexing operations (see [#47349][47349]). This has been fixed (which also
5233 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5234 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5236 [33903]: https://github.com/rust-lang/rust/pull/33903
5237 [47947]: https://github.com/rust-lang/rust/pull/47947
5238 [47948]: https://github.com/rust-lang/rust/pull/47948
5239 [47760]: https://github.com/rust-lang/rust/pull/47760
5240 [47790]: https://github.com/rust-lang/rust/pull/47790
5241 [47828]: https://github.com/rust-lang/rust/pull/47828
5242 [47398]: https://github.com/rust-lang/rust/pull/47398
5243 [47510]: https://github.com/rust-lang/rust/pull/47510
5244 [47521]: https://github.com/rust-lang/rust/pull/47521
5245 [47204]: https://github.com/rust-lang/rust/pull/47204
5246 [47251]: https://github.com/rust-lang/rust/pull/47251
5247 [47268]: https://github.com/rust-lang/rust/pull/47268
5248 [47282]: https://github.com/rust-lang/rust/pull/47282
5249 [47300]: https://github.com/rust-lang/rust/pull/47300
5250 [47349]: https://github.com/rust-lang/rust/pull/47349
5251 [46931]: https://github.com/rust-lang/rust/pull/46931
5252 [46985]: https://github.com/rust-lang/rust/pull/46985
5253 [47006]: https://github.com/rust-lang/rust/pull/47006
5254 [46830]: https://github.com/rust-lang/rust/pull/46830
5255 [46095]: https://github.com/rust-lang/rust/pull/46095
5256 [46666]: https://github.com/rust-lang/rust/pull/46666
5257 [46196]: https://github.com/rust-lang/rust/pull/46196
5258 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5259 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5260 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5261 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5262 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5265 Version 1.24.1 (2018-03-01)
5266 ==========================
5268 - [Do not abort when unwinding through FFI][48251]
5269 - [Emit UTF-16 files for linker arguments on Windows][48318]
5270 - [Make the error index generator work again][48308]
5271 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5273 [48251]: https://github.com/rust-lang/rust/issues/48251
5274 [48308]: https://github.com/rust-lang/rust/issues/48308
5275 [48318]: https://github.com/rust-lang/rust/issues/48318
5276 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5279 Version 1.24.0 (2018-02-15)
5280 ==========================
5284 - [External `sysv64` ffi is now available.][46528]
5285 eg. `extern "sysv64" fn foo () {}`
5289 - [rustc now uses 16 codegen units by default for release builds.][46910]
5290 For the fastest builds, utilize `codegen-units=1`.
5291 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5292 - [Add `aarch64-unknown-openbsd` support][46760]
5296 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5297 improvement in performance in the majority of cases.
5298 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5299 with Windows.][46798]
5300 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5301 - [impl `From<bool>` for `AtomicBool`][46293]
5302 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5303 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5304 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5305 - [float::from_bits now just uses transmute.][46012] This provides
5306 some optimisations from LLVM.
5307 - [Copied `AsciiExt` methods onto `char`][46077]
5308 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5309 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5310 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5311 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5315 - [`RefCell::replace`]
5317 - [`atomic::spin_loop_hint`]
5319 The following functions can now be used in a constant expression.
5320 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5322 - [`AtomicBool::new`][46287]
5323 - [`AtomicUsize::new`][46287]
5324 - [`AtomicIsize::new`][46287]
5325 - [`AtomicPtr::new`][46287]
5326 - [`Cell::new`][46287]
5327 - [`{integer}::min_value`][46287]
5328 - [`{integer}::max_value`][46287]
5329 - [`mem::size_of`][46287]
5330 - [`mem::align_of`][46287]
5331 - [`ptr::null`][46287]
5332 - [`ptr::null_mut`][46287]
5333 - [`RefCell::new`][46287]
5334 - [`UnsafeCell::new`][46287]
5338 - [Added a `workspace.default-members` config that
5339 overrides implied `--all` in virtual workspaces.][cargo/4743]
5340 - [Enable incremental by default on development builds.][cargo/4817] Also added
5341 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5342 per-project or global basis respectively.
5349 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5350 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5351 in accordance with IETF RFC 4291 §2.2.
5352 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5353 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5354 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5355 - [Leading zeros in tuple struct members is now an error][47084]
5356 - [`column!()` macro is one-based instead of zero-based][46977]
5357 - [`fmt::Arguments` can no longer be shared across threads][45198]
5358 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5359 - [Cargo sets a different working directory for the compiler][cargo/4788]
5361 [44884]: https://github.com/rust-lang/rust/pull/44884
5362 [45198]: https://github.com/rust-lang/rust/pull/45198
5363 [45506]: https://github.com/rust-lang/rust/pull/45506
5364 [45990]: https://github.com/rust-lang/rust/pull/45990
5365 [46012]: https://github.com/rust-lang/rust/pull/46012
5366 [46077]: https://github.com/rust-lang/rust/pull/46077
5367 [46094]: https://github.com/rust-lang/rust/pull/46094
5368 [46284]: https://github.com/rust-lang/rust/pull/46284
5369 [46287]: https://github.com/rust-lang/rust/pull/46287
5370 [46293]: https://github.com/rust-lang/rust/pull/46293
5371 [46528]: https://github.com/rust-lang/rust/pull/46528
5372 [46671]: https://github.com/rust-lang/rust/pull/46671
5373 [46713]: https://github.com/rust-lang/rust/pull/46713
5374 [46735]: https://github.com/rust-lang/rust/pull/46735
5375 [46760]: https://github.com/rust-lang/rust/pull/46760
5376 [46798]: https://github.com/rust-lang/rust/pull/46798
5377 [46828]: https://github.com/rust-lang/rust/pull/46828
5378 [46831]: https://github.com/rust-lang/rust/pull/46831
5379 [46833]: https://github.com/rust-lang/rust/pull/46833
5380 [46910]: https://github.com/rust-lang/rust/pull/46910
5381 [46977]: https://github.com/rust-lang/rust/pull/46977
5382 [47018]: https://github.com/rust-lang/rust/pull/47018
5383 [47080]: https://github.com/rust-lang/rust/pull/47080
5384 [47084]: https://github.com/rust-lang/rust/pull/47084
5385 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5386 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5387 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5388 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5389 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5390 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5393 Version 1.23.0 (2018-01-04)
5394 ==========================
5398 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5399 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5400 Which should fix some confusing errors in some operations.
5404 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5405 undefined behavior.][45920]
5406 - [rustc now suggests renaming import if names clash.][45660]
5407 - [Display errors/warnings correctly when there are zero-width or
5408 wide characters.][45711]
5409 - [rustc now avoids unnecessary copies of arguments that are
5410 simple bindings][45380] This should improve memory usage on average by 5-10%.
5411 - [Updated musl used to build musl rustc to 1.1.17][45393]
5415 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5416 - [Implement Hash for raw pointers to unsized types][45483]
5417 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5418 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5419 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5420 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5421 and `<*mut T>::as_mut`][44932]
5422 - [Optimized `Thread::{park, unpark}` implementation][45524]
5423 - [Improved `SliceExt::binary_search` performance.][45333]
5424 - [impl `FromIterator<()>` for `()`][45379]
5425 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5433 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5434 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5435 - [Added unit test checking to `cargo check`][cargo/4592]
5436 - [Cargo now lets you install a specific version
5437 using `cargo install --version`][cargo/4637]
5441 - [Releases now ship with the Cargo book documentation.][45692]
5442 - [rustdoc now prints rendering warnings on every run.][45324]
5446 - [Changes have been made to type equality to make it more correct,
5447 in rare cases this could break some code.][45853] [Tracking issue for
5448 further information][45852]
5449 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5450 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5451 Android 9, the minimum supported version is Android 14.
5452 - [Bumped the minimum LLVM to 3.9][45326]
5454 [44042]: https://github.com/rust-lang/rust/pull/44042
5455 [44932]: https://github.com/rust-lang/rust/pull/44932
5456 [45267]: https://github.com/rust-lang/rust/pull/45267
5457 [45324]: https://github.com/rust-lang/rust/pull/45324
5458 [45326]: https://github.com/rust-lang/rust/pull/45326
5459 [45333]: https://github.com/rust-lang/rust/pull/45333
5460 [45379]: https://github.com/rust-lang/rust/pull/45379
5461 [45380]: https://github.com/rust-lang/rust/pull/45380
5462 [45393]: https://github.com/rust-lang/rust/pull/45393
5463 [45435]: https://github.com/rust-lang/rust/pull/45435
5464 [45483]: https://github.com/rust-lang/rust/pull/45483
5465 [45524]: https://github.com/rust-lang/rust/pull/45524
5466 [45571]: https://github.com/rust-lang/rust/pull/45571
5467 [45580]: https://github.com/rust-lang/rust/pull/45580
5468 [45610]: https://github.com/rust-lang/rust/pull/45610
5469 [45660]: https://github.com/rust-lang/rust/pull/45660
5470 [45692]: https://github.com/rust-lang/rust/pull/45692
5471 [45711]: https://github.com/rust-lang/rust/pull/45711
5472 [45772]: https://github.com/rust-lang/rust/pull/45772
5473 [45852]: https://github.com/rust-lang/rust/issues/45852
5474 [45853]: https://github.com/rust-lang/rust/pull/45853
5475 [45887]: https://github.com/rust-lang/rust/pull/45887
5476 [45920]: https://github.com/rust-lang/rust/pull/45920
5477 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5478 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5479 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5482 Version 1.22.1 (2017-11-22)
5483 ==========================
5485 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5487 [46183]: https://github.com/rust-lang/rust/pull/46183
5489 Version 1.22.0 (2017-11-22)
5490 ==========================
5494 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5495 - [Now accepts underscores in unicode escapes][43716]
5496 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5497 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5501 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5502 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5503 This should decrease compile times for debug builds.
5504 - [strict memory alignment now enabled on ARMv6][45094]
5505 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5509 - [Allow atomic operations up to 32 bits
5510 on `armv5te_unknown_linux_gnueabi`][44978]
5511 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5512 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5513 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5514 - [Properly detect overflow in `Instant += Duration`.][44220]
5515 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5516 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5517 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5524 - [Cargo will now build multi file examples in subdirectories of the `examples`
5525 folder that have a `main.rs` file.][cargo/4496]
5526 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5527 the old format will continue to work and can be updated with `cargo update`.
5528 - [Now supports vendoring git repositories][cargo/3992]
5532 - [`libbacktrace` is now available on Apple platforms.][44251]
5533 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5534 This now lets you specify that a given code example will fail to compile.
5538 - [The minimum Android version that rustc can build for has been bumped
5539 to `4.0` from `2.3`][45656]
5540 - [Allowing `T op= &T` for numeric types has broken some type
5541 inference cases][45480]
5544 [42526]: https://github.com/rust-lang/rust/pull/42526
5545 [43716]: https://github.com/rust-lang/rust/pull/43716
5546 [43949]: https://github.com/rust-lang/rust/pull/43949
5547 [44015]: https://github.com/rust-lang/rust/pull/44015
5548 [44220]: https://github.com/rust-lang/rust/pull/44220
5549 [44251]: https://github.com/rust-lang/rust/pull/44251
5550 [44287]: https://github.com/rust-lang/rust/pull/44287
5551 [44303]: https://github.com/rust-lang/rust/pull/44303
5552 [44456]: https://github.com/rust-lang/rust/pull/44456
5553 [44466]: https://github.com/rust-lang/rust/pull/44466
5554 [44895]: https://github.com/rust-lang/rust/pull/44895
5555 [44966]: https://github.com/rust-lang/rust/pull/44966
5556 [44978]: https://github.com/rust-lang/rust/pull/44978
5557 [45041]: https://github.com/rust-lang/rust/pull/45041
5558 [45064]: https://github.com/rust-lang/rust/pull/45064
5559 [45075]: https://github.com/rust-lang/rust/pull/45075
5560 [45094]: https://github.com/rust-lang/rust/pull/45094
5561 [45095]: https://github.com/rust-lang/rust/pull/45095
5562 [45480]: https://github.com/rust-lang/rust/issues/45480
5563 [45656]: https://github.com/rust-lang/rust/pull/45656
5564 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5565 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5566 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5573 Version 1.21.0 (2017-10-12)
5574 ==========================
5578 - [You can now use static references for literals.][43838]
5582 let x: &'static u32 = &0;
5585 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5588 my_macro!(Vec<i32>::new); // Always worked
5589 my_macro!(Vec::<i32>::new); // Now works
5594 - [Upgraded jemalloc to 4.5.0][43911]
5595 - [Enabled unwinding panics on Redox][43917]
5596 - [Now runs LLVM in parallel during translation phase.][43506]
5597 This should reduce peak memory usage.
5601 - [Generate builtin impls for `Clone` for all arrays and tuples that
5602 are `T: Clone`][43690]
5603 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5604 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5605 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5610 [`std::mem::discriminant`]
5614 - [You can now call `cargo install` with multiple package names][cargo/4216]
5615 - [Cargo commands inside a virtual workspace will now implicitly
5616 pass `--all`][cargo/4335]
5617 - [Added a `[patch]` section to `Cargo.toml` to handle
5618 prepublication dependencies][cargo/4123] [RFC 1969]
5619 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5620 like patterns][cargo/4270]
5621 - [Added the `--all-targets` option][cargo/4400]
5622 - [Using required dependencies as a feature is now deprecated and emits
5623 a warning][cargo/4364]
5628 - [Cargo docs are moving][43916]
5629 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5630 - [The rustdoc book is now available][43863]
5631 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5632 - [Added a preview of RLS has been made available through rustup][44204]
5633 Install with `rustup component add rls-preview`
5634 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5635 Previously only showed `std::os::unix`.
5639 - [Changes in method matching against higher-ranked types][43880] This may cause
5640 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5641 - [rustc's JSON error output's byte position start at top of file.][42973]
5642 Was previously relative to the rustc's internal `CodeMap` struct which
5643 required the unstable library `libsyntax` to correctly use.
5644 - [`unused_results` lint no longer ignores booleans][43728]
5646 [42565]: https://github.com/rust-lang/rust/pull/42565
5647 [42973]: https://github.com/rust-lang/rust/pull/42973
5648 [43348]: https://github.com/rust-lang/rust/pull/43348
5649 [43459]: https://github.com/rust-lang/rust/pull/43459
5650 [43506]: https://github.com/rust-lang/rust/pull/43506
5651 [43540]: https://github.com/rust-lang/rust/pull/43540
5652 [43690]: https://github.com/rust-lang/rust/pull/43690
5653 [43728]: https://github.com/rust-lang/rust/pull/43728
5654 [43838]: https://github.com/rust-lang/rust/pull/43838
5655 [43863]: https://github.com/rust-lang/rust/pull/43863
5656 [43880]: https://github.com/rust-lang/rust/pull/43880
5657 [43911]: https://github.com/rust-lang/rust/pull/43911
5658 [43916]: https://github.com/rust-lang/rust/pull/43916
5659 [43917]: https://github.com/rust-lang/rust/pull/43917
5660 [44204]: https://github.com/rust-lang/rust/pull/44204
5661 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5662 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5663 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5664 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5665 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5666 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5667 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5668 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5669 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5671 Version 1.20.0 (2017-08-31)
5672 ===========================
5676 - [Associated constants are now stabilised.][42809]
5677 - [A lot of macro bugs are now fixed.][42913]
5682 - [Struct fields are now properly coerced to the expected field type.][42807]
5683 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5684 `wasm32-experimental-emscripten` target.
5685 - [Changed some of the error messages to be more helpful.][42033]
5686 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5688 - [rustc now reports the total number of errors on compilation failure][43015]
5689 previously this was only the number of errors in the pass that failed.
5690 - [Expansion in rustc has been sped up 29x.][42533]
5691 - [added `msp430-none-elf` target.][43099]
5692 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5694 - [Fixes backtraces on Redox][43228]
5695 - [rustc now identifies different versions of same crate when absolute paths of
5696 different types match in an error message.][42826]
5702 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5703 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5705 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5706 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5707 - [Impl `Clone` for `DefaultHasher`.][42799]
5708 - [Impl `Sync` for `SyncSender`.][42397]
5709 - [Impl `FromStr` for `char`][42271]
5710 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5712 - [allow messages in the `unimplemented!()` macro.][42155]
5713 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5714 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5715 - [Upgrade to Unicode 10.0.0][42999]
5716 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5717 - [Skip the main thread's manual stack guard on Linux][43072]
5718 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5719 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5721 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5726 - [`CStr::into_c_string`]
5727 - [`CString::as_c_str`]
5728 - [`CString::into_boxed_c_str`]
5729 - [`Chain::get_mut`]
5730 - [`Chain::get_ref`]
5731 - [`Chain::into_inner`]
5732 - [`Option::get_or_insert_with`]
5733 - [`Option::get_or_insert`]
5734 - [`OsStr::into_os_string`]
5735 - [`OsString::into_boxed_os_str`]
5738 - [`Utf8Error::error_len`]
5739 - [`char::EscapeDebug`]
5740 - [`char::escape_debug`]
5741 - [`compile_error!`]
5742 - [`f32::from_bits`]
5744 - [`f64::from_bits`]
5746 - [`mem::ManuallyDrop`]
5747 - [`slice::sort_unstable_by_key`]
5748 - [`slice::sort_unstable_by`]
5749 - [`slice::sort_unstable`]
5750 - [`str::from_boxed_utf8_unchecked`]
5751 - [`str::as_bytes_mut`]
5752 - [`str::as_bytes_mut`]
5753 - [`str::from_utf8_mut`]
5754 - [`str::from_utf8_unchecked_mut`]
5756 - [`str::get_unchecked_mut`]
5757 - [`str::get_unchecked`]
5759 - [`str::into_boxed_bytes`]
5764 - [Cargo API token location moved from `~/.cargo/config` to
5765 `~/.cargo/credentials`.][cargo/3978]
5766 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5767 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5768 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5769 - [You can now specify version of a binary when installed through
5770 `cargo install` using `--vers`.][cargo/4229]
5771 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5772 failure.][cargo/4248]
5773 - [Changed the convention around which file is the crate root.][cargo/4259]
5778 - [Functions with `'static` in their return types will now not be as usable as
5779 if they were using lifetime parameters instead.][42417]
5780 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5781 takes the sign of NaN into account where previously didn't.][42430]
5783 [42033]: https://github.com/rust-lang/rust/pull/42033
5784 [42155]: https://github.com/rust-lang/rust/pull/42155
5785 [42271]: https://github.com/rust-lang/rust/pull/42271
5786 [42397]: https://github.com/rust-lang/rust/pull/42397
5787 [42417]: https://github.com/rust-lang/rust/pull/42417
5788 [42430]: https://github.com/rust-lang/rust/pull/42430
5789 [42431]: https://github.com/rust-lang/rust/pull/42431
5790 [42533]: https://github.com/rust-lang/rust/pull/42533
5791 [42571]: https://github.com/rust-lang/rust/pull/42571
5792 [42613]: https://github.com/rust-lang/rust/pull/42613
5793 [42799]: https://github.com/rust-lang/rust/pull/42799
5794 [42807]: https://github.com/rust-lang/rust/pull/42807
5795 [42809]: https://github.com/rust-lang/rust/pull/42809
5796 [42822]: https://github.com/rust-lang/rust/pull/42822
5797 [42826]: https://github.com/rust-lang/rust/pull/42826
5798 [42854]: https://github.com/rust-lang/rust/pull/42854
5799 [42913]: https://github.com/rust-lang/rust/pull/42913
5800 [42999]: https://github.com/rust-lang/rust/pull/42999
5801 [43011]: https://github.com/rust-lang/rust/pull/43011
5802 [43015]: https://github.com/rust-lang/rust/pull/43015
5803 [43072]: https://github.com/rust-lang/rust/pull/43072
5804 [43077]: https://github.com/rust-lang/rust/pull/43077
5805 [43097]: https://github.com/rust-lang/rust/pull/43097
5806 [43099]: https://github.com/rust-lang/rust/pull/43099
5807 [43170]: https://github.com/rust-lang/rust/pull/43170
5808 [43178]: https://github.com/rust-lang/rust/pull/43178
5809 [43185]: https://github.com/rust-lang/rust/pull/43185
5810 [43228]: https://github.com/rust-lang/rust/pull/43228
5811 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5812 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5813 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5814 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5815 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5816 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5817 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5818 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5819 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5820 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5821 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5822 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5823 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5824 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5825 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5826 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5827 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5828 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5829 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5830 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5831 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5832 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5833 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5834 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5835 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5836 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5837 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5838 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5839 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5840 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5841 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5842 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5843 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5844 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5845 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5846 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5847 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5848 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5851 Version 1.19.0 (2017-07-20)
5852 ===========================
5857 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5858 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5859 - [Macro recursion limit increased to 1024 from 64.][41676]
5860 - [Added lint for detecting unused macros.][41907]
5861 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5862 For example: `let x = loop { break 7; };`
5863 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5864 contain `Copy` types and cannot have a `Drop` implementation.
5865 Example: `union Foo { bar: u8, baz: usize }`
5866 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5867 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5872 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5873 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5874 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5875 you should use `--target armv7-linux-androideabi`.
5876 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5877 - [Minor optimisation of string operations.][42037]
5878 - [Compiler error message is now `aborting due to previous error(s)` instead of
5879 `aborting due to N previous errors`][42150] This was previously inaccurate and
5880 would only count certain kinds of errors.
5881 - [The compiler now supports Visual Studio 2017][42225]
5882 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5883 - [Added a lot][42264] of [new error codes][42302]
5884 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5885 libraries with C Run-time Libraries(CRT) to be statically linked.
5886 - [Fixed various ARM codegen bugs][42740]
5891 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5892 `Extend<Cow<'a, str>>`][41449]
5893 - [`Vec` now implements `From<&mut [T]>`][41530]
5894 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5895 - [`SplitWhitespace` now implements `Clone`][41659]
5896 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5898 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5899 macros, but for printing to stderr.
5904 - [`OsString::shrink_to_fit`]
5907 - [`thread::ThreadId`]
5912 - [Build scripts can now add environment variables to the environment
5913 the crate is being compiled in.
5914 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5915 - [Subcommands now replace the current process rather than spawning a new
5916 child process][cargo/3970]
5917 - [Workspace members can now accept glob file patterns][cargo/3979]
5918 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5919 the members in a given workspace.][cargo/3988]
5920 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5921 - [Target directory path is now in the cargo metadata][cargo/4022]
5922 - [Cargo no longer checks out a local working directory for the
5923 crates.io index][cargo/4026] This should provide smaller file size for the
5924 registry, and improve cloning times, especially on Windows machines.
5925 - [Added an `--exclude` option for excluding certain packages when using the
5926 `--all` option][cargo/4031]
5927 - [Cargo will now automatically retry when receiving a 5xx error
5928 from crates.io][cargo/4032]
5929 - [The `--features` option now accepts multiple comma or space
5930 delimited values.][cargo/4084]
5931 - [Added support for custom target specific runners][cargo/3954]
5936 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5938 - [Rust will now release XZ compressed packages][rust-installer/57]
5939 - [rustup will now prefer to download rust packages with
5940 XZ compression][rustup/1100] over GZip packages.
5941 - [Added the ability to escape `#` in rust documentation][41785] By adding
5942 additional `#`'s ie. `##` is now `#`
5947 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5948 - [`-Z` flags are now no longer allowed to be used on the stable
5949 compiler.][41751] This has been a warning for a year previous to this.
5950 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5951 longer works][42844]. Users should migrate to the built-in `check`
5952 command, which has been available since 1.16.
5953 - [Ending a float literal with `._` is now a hard error.
5954 Example: `42._` .][41946]
5955 - [Any use of a private `extern crate` outside of its module is now a
5956 hard error.][36886] This was previously a warning.
5957 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5958 relative while the `::` prefix makes a path absolute, but was ignored and the
5959 path was relative regardless.
5960 - [Floating point constants in match patterns is now a hard error][36890]
5961 This was previously a warning.
5962 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5963 match patterns is now a hard error][36891] This was previously a warning.
5964 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5966 - [From the pound escape, lines consisting of multiple `#`s are
5968 - [It is an error to re-export private enum variants][42460]. This is
5969 known to break a number of crates that depend on an older version of
5971 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5972 to use it to find the linker, and the build will fail where it did
5973 not previously][42607]
5975 [36886]: https://github.com/rust-lang/rust/issues/36886
5976 [36888]: https://github.com/rust-lang/rust/issues/36888
5977 [36890]: https://github.com/rust-lang/rust/issues/36890
5978 [36891]: https://github.com/rust-lang/rust/issues/36891
5979 [36892]: https://github.com/rust-lang/rust/issues/36892
5980 [37406]: https://github.com/rust-lang/rust/issues/37406
5981 [39983]: https://github.com/rust-lang/rust/pull/39983
5982 [41145]: https://github.com/rust-lang/rust/pull/41145
5983 [41192]: https://github.com/rust-lang/rust/pull/41192
5984 [41258]: https://github.com/rust-lang/rust/pull/41258
5985 [41370]: https://github.com/rust-lang/rust/pull/41370
5986 [41449]: https://github.com/rust-lang/rust/pull/41449
5987 [41530]: https://github.com/rust-lang/rust/pull/41530
5988 [41624]: https://github.com/rust-lang/rust/pull/41624
5989 [41656]: https://github.com/rust-lang/rust/pull/41656
5990 [41659]: https://github.com/rust-lang/rust/pull/41659
5991 [41676]: https://github.com/rust-lang/rust/pull/41676
5992 [41751]: https://github.com/rust-lang/rust/pull/41751
5993 [41764]: https://github.com/rust-lang/rust/pull/41764
5994 [41785]: https://github.com/rust-lang/rust/pull/41785
5995 [41873]: https://github.com/rust-lang/rust/pull/41873
5996 [41907]: https://github.com/rust-lang/rust/pull/41907
5997 [41946]: https://github.com/rust-lang/rust/pull/41946
5998 [42016]: https://github.com/rust-lang/rust/pull/42016
5999 [42037]: https://github.com/rust-lang/rust/pull/42037
6000 [42068]: https://github.com/rust-lang/rust/pull/42068
6001 [42150]: https://github.com/rust-lang/rust/pull/42150
6002 [42162]: https://github.com/rust-lang/rust/pull/42162
6003 [42225]: https://github.com/rust-lang/rust/pull/42225
6004 [42264]: https://github.com/rust-lang/rust/pull/42264
6005 [42302]: https://github.com/rust-lang/rust/pull/42302
6006 [42460]: https://github.com/rust-lang/rust/issues/42460
6007 [42607]: https://github.com/rust-lang/rust/issues/42607
6008 [42740]: https://github.com/rust-lang/rust/pull/42740
6009 [42844]: https://github.com/rust-lang/rust/issues/42844
6010 [42948]: https://github.com/rust-lang/rust/pull/42948
6011 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6012 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6013 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6014 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6015 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6016 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6017 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6018 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6019 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6020 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6021 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6022 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6023 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6024 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6025 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6026 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6027 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6028 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6029 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6030 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6031 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6032 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6035 Version 1.18.0 (2017-06-08)
6036 ===========================
6041 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6042 make the item visible to just that module tree. Also accepts the keyword
6043 `crate` to make something public to the whole crate but not users of the
6044 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6045 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6046 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6047 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6048 types like `Write + Send`, trailing `+` are now supported in trait objects,
6049 and better error reporting for trait objects starting with `?Sized`.
6050 - [0e+10 is now a valid floating point literal][40589]
6051 - [Now warns if you bind a lifetime parameter to 'static][40734]
6052 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6053 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6054 representation in some cases.][40377]
6059 - [rustc can now emit mir with `--emit mir`][39891]
6060 - [Improved LLVM IR for trivial functions][40367]
6061 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6062 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6063 opportunities found through profiling
6064 - [Improved backtrace formatting when panicking][38165]
6069 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6070 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6071 iteration or reallocation.
6072 - [Simplified HashMap Bucket interface][40561] provides performance
6073 improvements for iterating and cloning.
6074 - [Specialize Vec::from_elem to use calloc][40409]
6075 - [Fixed Race condition in fs::create_dir_all][39799]
6076 - [No longer caching stdio on Windows][40516]
6077 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6078 2.50%~ faster and in one case now 12.50% faster.
6079 - [Optimized `AtomicBool::fetch_nand`][41143]
6084 - [`Child::try_wait`]
6085 - [`HashMap::retain`]
6086 - [`HashSet::retain`]
6088 - [`TcpStream::peek`]
6089 - [`UdpSocket::peek`]
6090 - [`UdpSocket::peek_from`]
6095 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6096 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6097 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6098 - [Added Android build support][cargo/3885]
6099 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6100 of a certain type, for example `cargo build --bins` will build all
6102 - [Added support for haiku][cargo/3952]
6107 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6108 - [Rust now uses the official cross compiler for NetBSD][40612]
6109 - [rustdoc now accepts `#` at the start of files][40828]
6110 - [Fixed jemalloc support for musl][41168]
6115 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6116 always placed after the sign if it exists and before the digits. With the `#`
6117 flag the zeroes are placed after the prefix and before the digits.
6118 - [Due to the struct field optimisation][40377], using `transmute` on structs
6119 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6120 always been undefined behavior, but is now more likely to break in practice.
6121 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6122 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6123 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6124 - [Overlapping inherent `impl`s are now a hard error][40728]
6125 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6126 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6127 `out.asm` and `out.ll` instead of only one of the filetypes.
6128 - [ calling a function that returns `Self` will no longer work][41805] when
6129 the size of `Self` cannot be statically determined.
6130 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6131 this has caused a few regressions namely:
6133 - Changed the link order of local static/dynamic libraries (respecting the
6134 order on given rather than having the compiler reorder).
6135 - Changed how MinGW is linked, native code linked to dynamic libraries
6136 may require manually linking to the gcc support library (for the native
6139 [38165]: https://github.com/rust-lang/rust/pull/38165
6140 [39799]: https://github.com/rust-lang/rust/pull/39799
6141 [39891]: https://github.com/rust-lang/rust/pull/39891
6142 [40043]: https://github.com/rust-lang/rust/pull/40043
6143 [40241]: https://github.com/rust-lang/rust/pull/40241
6144 [40338]: https://github.com/rust-lang/rust/pull/40338
6145 [40367]: https://github.com/rust-lang/rust/pull/40367
6146 [40377]: https://github.com/rust-lang/rust/pull/40377
6147 [40409]: https://github.com/rust-lang/rust/pull/40409
6148 [40516]: https://github.com/rust-lang/rust/pull/40516
6149 [40556]: https://github.com/rust-lang/rust/pull/40556
6150 [40561]: https://github.com/rust-lang/rust/pull/40561
6151 [40589]: https://github.com/rust-lang/rust/pull/40589
6152 [40612]: https://github.com/rust-lang/rust/pull/40612
6153 [40723]: https://github.com/rust-lang/rust/pull/40723
6154 [40728]: https://github.com/rust-lang/rust/pull/40728
6155 [40731]: https://github.com/rust-lang/rust/pull/40731
6156 [40734]: https://github.com/rust-lang/rust/pull/40734
6157 [40805]: https://github.com/rust-lang/rust/pull/40805
6158 [40807]: https://github.com/rust-lang/rust/pull/40807
6159 [40828]: https://github.com/rust-lang/rust/pull/40828
6160 [40870]: https://github.com/rust-lang/rust/pull/40870
6161 [41085]: https://github.com/rust-lang/rust/pull/41085
6162 [41143]: https://github.com/rust-lang/rust/pull/41143
6163 [41168]: https://github.com/rust-lang/rust/pull/41168
6164 [41270]: https://github.com/rust-lang/rust/issues/41270
6165 [41469]: https://github.com/rust-lang/rust/pull/41469
6166 [41805]: https://github.com/rust-lang/rust/issues/41805
6167 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6168 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6169 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6170 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6171 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6172 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6173 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6174 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6175 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6176 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6177 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6178 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6179 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6180 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6183 Version 1.17.0 (2017-04-27)
6184 ===========================
6189 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6190 * [Fields of structs may be initialized without duplicating the field/variable
6191 names][39761]. [RFC 1682]
6192 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6193 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6194 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6195 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6196 `'b`. Soundness fix.
6197 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6198 * [Static variables may contain references to other statics][40027]
6203 * [Exit quickly on only `--emit dep-info`][40336]
6204 * [Make `-C relocation-model` more correctly determine whether the linker
6205 creates a position-independent executable][40245]
6206 * [Add `-C overflow-checks` to directly control whether integer overflow
6208 * [The rustc type checker now checks items on demand instead of in a single
6209 in-order pass][40008]. This is mostly an internal refactoring in support of
6210 future work, including incremental type checking, but also resolves [RFC
6211 1647], allowing `Self` to appear in `impl` `where` clauses.
6212 * [Optimize vtable loads][39995]
6213 * [Turn off vectorization for Emscripten targets][39990]
6214 * [Provide suggestions for unknown macros imported with `use`][39953]
6215 * [Fix ICEs in path resolution][39939]
6216 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6217 * [Add clearer error message using `&str + &str`][39116]
6228 * [`Ordering::then`]
6229 * [`Ordering::then_with`]
6230 * [`BTreeMap::range`]
6231 * [`BTreeMap::range_mut`]
6232 * [`collections::Bound`]
6233 * [`process::abort`]
6234 * [`ptr::read_unaligned`]
6235 * [`ptr::write_unaligned`]
6236 * [`Result::expect_err`]
6239 * [`Cell::into_inner`]
6245 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6246 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6247 * [`String` implements `FromIterator<&char>`][40028]
6248 * `Box` [implements][40009] a number of new conversions:
6249 `From<Box<str>> for String`,
6250 `From<Box<[T]>> for Vec<T>`,
6251 `From<Box<CStr>> for CString`,
6252 `From<Box<OsStr>> for OsString`,
6253 `From<Box<Path>> for PathBuf`,
6254 `Into<Box<str>> for String`,
6255 `Into<Box<[T]>> for Vec<T>`,
6256 `Into<Box<CStr>> for CString`,
6257 `Into<Box<OsStr>> for OsString`,
6258 `Into<Box<Path>> for PathBuf`,
6259 `Default for Box<str>`,
6260 `Default for Box<CStr>`,
6261 `Default for Box<OsStr>`,
6262 `From<&CStr> for Box<CStr>`,
6263 `From<&OsStr> for Box<OsStr>`,
6264 `From<&Path> for Box<Path>`
6265 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6266 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6267 * [Slightly optimize `slice::sort`][39538]
6268 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6269 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6270 `Box<str>` implements `From<&str>`][39438]
6271 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6272 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6273 * [`format!` estimates the needed capacity before writing a string][39356]
6274 * [Support unprivileged symlink creation in Windows][38921]
6275 * [`PathBuf` implements `Default`][38764]
6276 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6277 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6278 and poor hash functions.
6283 * [Add `cargo check --all`][cargo/3731]
6284 * [Add an option to ignore SSL revocation checking][cargo/3699]
6285 * [Add `cargo run --package`][cargo/3691]
6286 * [Add `required_features`][cargo/3667]
6287 * [Assume `build.rs` is a build script][cargo/3664]
6288 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6293 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6295 * [The "Unstable Book" documents nightly-only features][ubook]
6296 * [Improve the style of the sidebar in rustdoc output][40265]
6297 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6298 * [Fix MSP430 breakage due to `i128`][40257]
6299 * [Preliminary Solaris/SPARCv9 support][39903]
6300 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6301 run without installing the MSVC runtime.
6302 * [`rustdoc --test` includes file names in test names][39788]
6303 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6304 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6305 * [Initial support for `aarch64-unknown-freebsd`][39491]
6306 * [Initial support for `i686-unknown-netbsd`][39426]
6307 * [This release no longer includes the old makefile build system][39431]. Rust
6308 is built with a custom build system, written in Rust, and with Cargo.
6309 * [Add Debug implementations for libcollection structs][39002]
6310 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6311 * [`--test-threads=0` produces an error][38945]
6312 * [`rustup` installs documentation by default][40526]
6313 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6314 WinDbg and Visual Studio to improve the debugging experience.
6319 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6320 workaround, either use MSVC 2015 or run vcvars.bat.
6321 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6322 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6323 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6325 * [`format!` and `Display::to_string` panic if an underlying formatting
6326 implementation returns an error][40117]. Previously the error was silently
6327 ignored. It is incorrect for `write_fmt` to return an error when writing
6329 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6330 crates were marked stable and could be accessed from the stable toolchain.
6331 * [Rust git source no longer includes vendored crates][39728]. Those that need
6332 to build with vendored crates should build from release tarballs.
6333 * [Fix inert attributes from `proc_macro_derives`][39572]
6334 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6335 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6337 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6338 existing code generally ignores the type of dead-code unless a type-hint is
6339 provided; this can cause surprising inference interactions particularly around
6340 defaulting. The new code uniformly ignores the result type of dead-code.
6341 * [Tuple-struct constructors with private fields are no longer visible][38932]
6342 * [Lifetime parameters that do not appear in the arguments are now considered
6343 early-bound][38897], resolving a soundness bug (#[32330]). The
6344 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6346 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6347 * [Make transmuting from fn item types to pointer-sized types a hard
6350 [27787]: https://github.com/rust-lang/rust/issues/27787
6351 [32330]: https://github.com/rust-lang/rust/issues/32330
6352 [34198]: https://github.com/rust-lang/rust/pull/34198
6353 [38161]: https://github.com/rust-lang/rust/pull/38161
6354 [38368]: https://github.com/rust-lang/rust/pull/38368
6355 [38584]: https://github.com/rust-lang/rust/issues/38584
6356 [38661]: https://github.com/rust-lang/rust/pull/38661
6357 [38764]: https://github.com/rust-lang/rust/pull/38764
6358 [38864]: https://github.com/rust-lang/rust/issues/38864
6359 [38897]: https://github.com/rust-lang/rust/pull/38897
6360 [38921]: https://github.com/rust-lang/rust/pull/38921
6361 [38932]: https://github.com/rust-lang/rust/pull/38932
6362 [38945]: https://github.com/rust-lang/rust/pull/38945
6363 [38981]: https://github.com/rust-lang/rust/pull/38981
6364 [39002]: https://github.com/rust-lang/rust/pull/39002
6365 [39116]: https://github.com/rust-lang/rust/pull/39116
6366 [39193]: https://github.com/rust-lang/rust/pull/39193
6367 [39265]: https://github.com/rust-lang/rust/pull/39265
6368 [39356]: https://github.com/rust-lang/rust/pull/39356
6369 [39372]: https://github.com/rust-lang/rust/pull/39372
6370 [39426]: https://github.com/rust-lang/rust/pull/39426
6371 [39431]: https://github.com/rust-lang/rust/pull/39431
6372 [39438]: https://github.com/rust-lang/rust/pull/39438
6373 [39440]: https://github.com/rust-lang/rust/pull/39440
6374 [39485]: https://github.com/rust-lang/rust/pull/39485
6375 [39491]: https://github.com/rust-lang/rust/pull/39491
6376 [39518]: https://github.com/rust-lang/rust/pull/39518
6377 [39538]: https://github.com/rust-lang/rust/pull/39538
6378 [39572]: https://github.com/rust-lang/rust/pull/39572
6379 [39633]: https://github.com/rust-lang/rust/pull/39633
6380 [39642]: https://github.com/rust-lang/rust/pull/39642
6381 [39728]: https://github.com/rust-lang/rust/pull/39728
6382 [39761]: https://github.com/rust-lang/rust/pull/39761
6383 [39788]: https://github.com/rust-lang/rust/pull/39788
6384 [39793]: https://github.com/rust-lang/rust/pull/39793
6385 [39837]: https://github.com/rust-lang/rust/pull/39837
6386 [39843]: https://github.com/rust-lang/rust/pull/39843
6387 [39851]: https://github.com/rust-lang/rust/pull/39851
6388 [39903]: https://github.com/rust-lang/rust/pull/39903
6389 [39939]: https://github.com/rust-lang/rust/pull/39939
6390 [39953]: https://github.com/rust-lang/rust/pull/39953
6391 [39960]: https://github.com/rust-lang/rust/pull/39960
6392 [39990]: https://github.com/rust-lang/rust/pull/39990
6393 [39995]: https://github.com/rust-lang/rust/pull/39995
6394 [40008]: https://github.com/rust-lang/rust/pull/40008
6395 [40009]: https://github.com/rust-lang/rust/pull/40009
6396 [40027]: https://github.com/rust-lang/rust/pull/40027
6397 [40028]: https://github.com/rust-lang/rust/pull/40028
6398 [40037]: https://github.com/rust-lang/rust/pull/40037
6399 [40117]: https://github.com/rust-lang/rust/pull/40117
6400 [40166]: https://github.com/rust-lang/rust/pull/40166
6401 [40245]: https://github.com/rust-lang/rust/pull/40245
6402 [40257]: https://github.com/rust-lang/rust/pull/40257
6403 [40261]: https://github.com/rust-lang/rust/pull/40261
6404 [40265]: https://github.com/rust-lang/rust/pull/40265
6405 [40319]: https://github.com/rust-lang/rust/pull/40319
6406 [40336]: https://github.com/rust-lang/rust/pull/40336
6407 [40526]: https://github.com/rust-lang/rust/pull/40526
6408 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6409 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6410 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6411 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6412 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6413 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6414 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6415 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6416 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6417 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6418 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6419 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6420 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6421 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6422 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6423 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6424 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6425 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6426 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6427 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6428 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6429 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6430 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6431 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6432 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6433 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6434 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6435 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6436 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6437 [ubook]: https://doc.rust-lang.org/unstable-book/
6440 Version 1.16.0 (2017-03-16)
6441 ===========================
6446 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6447 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6448 match patterns][38069]
6449 * [Clean up semantics of `self` in an import list][38313]
6450 * [`Self` may appear in `impl` headers][38920]
6451 * [`Self` may appear in struct expressions][39282]
6456 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6457 a `.rmeta` file containing only crate metadata][38571]. This can be
6458 used by tools like the Rust Language Service to perform
6459 metadata-only builds.
6460 * [Levenshtein based typo suggestions now work in most places, while
6461 previously they worked only for fields and sometimes for local
6462 variables][38927]. Together with the overhaul of "no
6463 resolution"/"unexpected resolution" errors (#[38154]) they result in
6464 large and systematic improvement in resolution diagnostics.
6465 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6467 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6468 * [`rustc` no longer attempts to provide "consider using an explicit
6469 lifetime" suggestions][37057]. They were inaccurate.
6474 * [`VecDeque::truncate`]
6475 * [`VecDeque::resize`]
6476 * [`String::insert_str`]
6477 * [`Duration::checked_add`]
6478 * [`Duration::checked_sub`]
6479 * [`Duration::checked_div`]
6480 * [`Duration::checked_mul`]
6483 * [`SocketAddr::is_ipv4`]
6484 * [`SocketAddr::is_ipv6`]
6485 * [`IpAddr::is_ipv4`]
6486 * [`IpAddr::is_ipv6`]
6488 * [`Vec::dedup_by_key`]
6489 * [`Result::unwrap_or_default`]
6490 * [`<*const T>::wrapping_offset`]
6491 * [`<*mut T>::wrapping_offset`]
6492 * `CommandExt::creation_flags`
6493 * [`File::set_permissions`]
6494 * [`String::split_off`]
6499 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6500 their argument by `Borrow` parameter][37761]
6501 * [All public types in std implement `Debug`][38006]
6502 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6503 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6504 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6506 * [std: Fix partial writes in `LineWriter`][38062]
6507 * [std: Clamp max read/write sizes on Unix][38622]
6508 * [Use more specific panic message for `&str` slicing errors][38066]
6509 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6510 functionality cannot be achieved in std currently.
6511 * [`writeln!`, like `println!`, now accepts a form with no string
6512 or formatting arguments, to just print a newline][38469]
6513 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6514 * [Reduce the size of static data in `std_unicode::tables`][38781]
6515 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6516 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6518 * [`Duration` implements `Sum`][38712]
6519 * [`String` implements `ToSocketAddrs`][39048]
6524 * [The `cargo check` command does a type check of a project without
6525 building it][cargo/3296]
6526 * [crates.io will display CI badges from Travis and AppVeyor, if
6527 specified in Cargo.toml][cargo/3546]
6528 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6529 * [Compilation profiles accept integer values for `debug`, in addition
6530 to `true` and `false`. These are passed to `rustc` as the value to
6531 `-C debuginfo`][cargo/3534]
6532 * [Implement `cargo --version --verbose`][cargo/3604]
6533 * [All builds now output 'dep-info' build dependencies compatible with
6534 make and ninja][cargo/3557]
6535 * [Build all workspace members with `build --all`][cargo/3511]
6536 * [Document all workspace members with `doc --all`][cargo/3515]
6537 * [Path deps outside workspace are not members][cargo/3443]
6542 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6543 the path to the Rust implementation][38589]
6544 * [The `armv7-linux-androideabi` target no longer enables NEON
6545 extensions, per Google's ABI guide][38413]
6546 * [The stock standard library can be compiled for Redox OS][38401]
6547 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6549 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6551 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6556 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6557 match patterns][38069]
6558 * In this release, references to uninhabited types can not be
6559 pattern-matched. This was accidentally allowed in 1.15.
6560 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6561 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6563 * [Clean up semantics of `self` in an import list][38313]
6564 * Reimplemented lifetime elision. This change was almost entirely compatible
6565 with existing code, but it did close a number of small bugs and loopholes,
6566 as well as being more accepting in some other [cases][41105].
6568 [37057]: https://github.com/rust-lang/rust/pull/37057
6569 [37761]: https://github.com/rust-lang/rust/pull/37761
6570 [38006]: https://github.com/rust-lang/rust/pull/38006
6571 [38051]: https://github.com/rust-lang/rust/pull/38051
6572 [38062]: https://github.com/rust-lang/rust/pull/38062
6573 [38622]: https://github.com/rust-lang/rust/pull/38622
6574 [38066]: https://github.com/rust-lang/rust/pull/38066
6575 [38069]: https://github.com/rust-lang/rust/pull/38069
6576 [38131]: https://github.com/rust-lang/rust/pull/38131
6577 [38154]: https://github.com/rust-lang/rust/pull/38154
6578 [38274]: https://github.com/rust-lang/rust/pull/38274
6579 [38304]: https://github.com/rust-lang/rust/pull/38304
6580 [38313]: https://github.com/rust-lang/rust/pull/38313
6581 [38327]: https://github.com/rust-lang/rust/pull/38327
6582 [38401]: https://github.com/rust-lang/rust/pull/38401
6583 [38413]: https://github.com/rust-lang/rust/pull/38413
6584 [38469]: https://github.com/rust-lang/rust/pull/38469
6585 [38559]: https://github.com/rust-lang/rust/pull/38559
6586 [38571]: https://github.com/rust-lang/rust/pull/38571
6587 [38580]: https://github.com/rust-lang/rust/pull/38580
6588 [38589]: https://github.com/rust-lang/rust/pull/38589
6589 [38670]: https://github.com/rust-lang/rust/pull/38670
6590 [38712]: https://github.com/rust-lang/rust/pull/38712
6591 [38726]: https://github.com/rust-lang/rust/pull/38726
6592 [38781]: https://github.com/rust-lang/rust/pull/38781
6593 [38798]: https://github.com/rust-lang/rust/pull/38798
6594 [38909]: https://github.com/rust-lang/rust/pull/38909
6595 [38920]: https://github.com/rust-lang/rust/pull/38920
6596 [38927]: https://github.com/rust-lang/rust/pull/38927
6597 [39048]: https://github.com/rust-lang/rust/pull/39048
6598 [39282]: https://github.com/rust-lang/rust/pull/39282
6599 [39379]: https://github.com/rust-lang/rust/pull/39379
6600 [41105]: https://github.com/rust-lang/rust/issues/41105
6601 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6602 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6603 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6604 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6605 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6606 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6607 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6608 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6609 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6610 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6611 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6612 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6613 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6614 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6615 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6616 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6617 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6618 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6619 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6620 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6621 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6622 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6623 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6624 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6625 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6626 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6627 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6628 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6629 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6632 Version 1.15.1 (2017-02-09)
6633 ===========================
6635 * [Fix IntoIter::as_mut_slice's signature][39466]
6636 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6638 [39466]: https://github.com/rust-lang/rust/pull/39466
6639 [39523]: https://github.com/rust-lang/rust/pull/39523
6642 Version 1.15.0 (2017-02-02)
6643 ===========================
6648 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6649 stable. This allows popular code-generating crates like Serde and Diesel to
6650 work ergonomically. [RFC 1681].
6651 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6652 with curly braces][36868]. Part of [RFC 1506].
6653 * [A number of minor changes to name resolution have been activated][37127].
6654 They add up to more consistent semantics, allowing for future evolution of
6655 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6656 details of what is different. The breaking changes here have been transitioned
6657 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6658 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6660 * [`?Sized` can be used in `where` clauses][37791]
6661 * [There is now a limit on the size of monomorphized types and it can be
6662 modified with the `#![type_size_limit]` crate attribute, similarly to
6663 the `#![recursion_limit]` attribute][37789]
6668 * [On Windows, the compiler will apply dllimport attributes when linking to
6669 extern functions][37973]. Additional attributes and flags can control which
6670 library kind is linked and its name. [RFC 1717].
6671 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6672 * [The `--test` flag works with procedural macro crates][38107]
6673 * [Fix `extern "aapcs" fn` ABI][37814]
6674 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6675 * [The `format!` expander recognizes incorrect `printf` and shell-style
6676 formatting directives and suggests the correct format][37613].
6677 * [Only report one error for all unused imports in an import list][37456]
6679 Compiler Performance
6680 --------------------
6682 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6683 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6684 * [Don't clone in `UnificationTable::probe`][37848]
6685 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6686 * [Use small vectors in type walker][37760]
6687 * [Macro expansion performance was improved][37701]
6688 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6689 * [Replace FNV with a faster hash function][37229]
6694 * [`std::iter::Iterator::min_by`]
6695 * [`std::iter::Iterator::max_by`]
6696 * [`std::os::*::fs::FileExt`]
6697 * [`std::sync::atomic::Atomic*::get_mut`]
6698 * [`std::sync::atomic::Atomic*::into_inner`]
6699 * [`std::vec::IntoIter::as_slice`]
6700 * [`std::vec::IntoIter::as_mut_slice`]
6701 * [`std::sync::mpsc::Receiver::try_iter`]
6702 * [`std::os::unix::process::CommandExt::before_exec`]
6703 * [`std::rc::Rc::strong_count`]
6704 * [`std::rc::Rc::weak_count`]
6705 * [`std::sync::Arc::strong_count`]
6706 * [`std::sync::Arc::weak_count`]
6707 * [`std::char::encode_utf8`]
6708 * [`std::char::encode_utf16`]
6709 * [`std::cell::Ref::clone`]
6710 * [`std::io::Take::into_inner`]
6715 * [The standard sorting algorithm has been rewritten for dramatic performance
6716 improvements][38192]. It is a hybrid merge sort, drawing influences from
6717 Timsort. Previously it was a naive merge sort.
6718 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6719 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6721 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6722 and `char_indices().last()`][37882]
6723 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6724 * [Chinese characters display correctly in `fmt::Debug`][37855]
6725 * [Derive `Default` for `Duration`][37699]
6726 * [Support creation of anonymous pipes on WinXP/2k][37677]
6727 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6728 * [Don't pass overlapped handles to processes][38835]
6733 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6734 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6735 should instead check the variable at runtime with `std::env`. That the value
6736 was set at build time was a bug, and incorrect when cross-compiling. This
6737 change is known to cause breakage.
6738 * [Add `--all` flag to `cargo test`][cargo/3221]
6739 * [Compile statically against the MSVC CRT][cargo/3363]
6740 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6741 * [Link OpenSSL statically on OSX][cargo/3311]
6742 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6743 * [Test for bad path overrides with summaries][cargo/3336]
6744 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6745 * [Fix retrying crate downloads for network errors][cargo/3348]
6746 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6747 * [Emit more info on --message-format=json][cargo/3319]
6748 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6749 * [Don't ignore errors in workspace manifest][cargo/3409]
6750 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6755 * [Test runners (binaries built with `--test`) now support a `--list` argument
6756 that lists the tests it contains][38185]
6757 * [Test runners now support a `--exact` argument that makes the test filter
6758 match exactly, instead of matching only a substring of the test name][38181]
6759 * [rustdoc supports a `--playground-url` flag][37763]
6760 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6765 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6766 continue to be used in this release by passing `--disable-rustbuild` to the
6767 configure script, but they will be deleted soon. Note that the new build
6768 system uses a different on-disk layout that will likely affect any scripts
6770 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6772 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6773 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6779 * [A number of minor changes to name resolution have been activated][37127].
6780 They add up to more consistent semantics, allowing for future evolution of
6781 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6782 details of what is different. The breaking changes here have been transitioned
6783 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6784 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6785 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6786 should instead check the variable at runtime with `std::env`. That the value
6787 was set at build time was a bug, and incorrect when cross-compiling. This
6788 change is known to cause breakage.
6789 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6790 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6791 1.10 and is now an error by default. It will become a hard error in the near
6793 * [The semantics relating modules to file system directories are changing in
6794 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6795 lint, which is a warning in this release, and will become a hard error in the
6797 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6798 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6799 the underlying iterator][37834]
6801 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6802 [33685]: https://github.com/rust-lang/rust/issues/33685
6803 [36868]: https://github.com/rust-lang/rust/pull/36868
6804 [37127]: https://github.com/rust-lang/rust/pull/37127
6805 [37229]: https://github.com/rust-lang/rust/pull/37229
6806 [37456]: https://github.com/rust-lang/rust/pull/37456
6807 [37527]: https://github.com/rust-lang/rust/pull/37527
6808 [37602]: https://github.com/rust-lang/rust/pull/37602
6809 [37613]: https://github.com/rust-lang/rust/pull/37613
6810 [37615]: https://github.com/rust-lang/rust/pull/37615
6811 [37636]: https://github.com/rust-lang/rust/pull/37636
6812 [37627]: https://github.com/rust-lang/rust/pull/37627
6813 [37642]: https://github.com/rust-lang/rust/pull/37642
6814 [37677]: https://github.com/rust-lang/rust/pull/37677
6815 [37699]: https://github.com/rust-lang/rust/pull/37699
6816 [37701]: https://github.com/rust-lang/rust/pull/37701
6817 [37705]: https://github.com/rust-lang/rust/pull/37705
6818 [37749]: https://github.com/rust-lang/rust/pull/37749
6819 [37760]: https://github.com/rust-lang/rust/pull/37760
6820 [37763]: https://github.com/rust-lang/rust/pull/37763
6821 [37764]: https://github.com/rust-lang/rust/pull/37764
6822 [37789]: https://github.com/rust-lang/rust/pull/37789
6823 [37791]: https://github.com/rust-lang/rust/pull/37791
6824 [37814]: https://github.com/rust-lang/rust/pull/37814
6825 [37817]: https://github.com/rust-lang/rust/pull/37817
6826 [37834]: https://github.com/rust-lang/rust/pull/37834
6827 [37848]: https://github.com/rust-lang/rust/pull/37848
6828 [37855]: https://github.com/rust-lang/rust/pull/37855
6829 [37882]: https://github.com/rust-lang/rust/pull/37882
6830 [37888]: https://github.com/rust-lang/rust/pull/37888
6831 [37973]: https://github.com/rust-lang/rust/pull/37973
6832 [37979]: https://github.com/rust-lang/rust/pull/37979
6833 [38086]: https://github.com/rust-lang/rust/pull/38086
6834 [38107]: https://github.com/rust-lang/rust/pull/38107
6835 [38117]: https://github.com/rust-lang/rust/pull/38117
6836 [38134]: https://github.com/rust-lang/rust/pull/38134
6837 [38146]: https://github.com/rust-lang/rust/pull/38146
6838 [38181]: https://github.com/rust-lang/rust/pull/38181
6839 [38182]: https://github.com/rust-lang/rust/pull/38182
6840 [38185]: https://github.com/rust-lang/rust/pull/38185
6841 [38192]: https://github.com/rust-lang/rust/pull/38192
6842 [38279]: https://github.com/rust-lang/rust/pull/38279
6843 [38835]: https://github.com/rust-lang/rust/pull/38835
6844 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6845 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6846 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6847 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6848 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6849 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6850 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6851 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6852 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6853 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6854 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6855 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6856 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6857 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6858 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6859 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6860 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6861 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6862 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6863 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6864 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6865 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6866 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6867 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6868 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6869 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6870 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6871 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6872 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6873 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6874 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6875 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6876 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6877 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6878 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6879 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6880 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6883 Version 1.14.0 (2016-12-22)
6884 ===========================
6889 * [`..` matches multiple tuple fields in enum variants, structs
6890 and tuples][36843]. [RFC 1492].
6891 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6892 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6893 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6894 dereferencing][36822]
6899 * [Mark enums with non-zero discriminant as non-zero][37224]
6900 * [Lower-case `static mut` names are linted like other
6901 statics and consts][37162]
6902 * [Fix ICE on some macros in const integer positions
6903 (e.g. `[u8; m!()]`)][36819]
6904 * [Improve error message and snippet for "did you mean `x`"][36798]
6905 * [Add a panic-strategy field to the target specification][36794]
6906 * [Include LLVM version in `--version --verbose`][37200]
6908 Compile-time Optimizations
6909 --------------------------
6911 * [Improve macro expansion performance][37569]
6912 * [Shrink `Expr_::ExprInlineAsm`][37445]
6913 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6914 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6915 * [Avoid more allocations when compiling html5ever][37373]
6916 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6917 * [Avoid some allocations in the macro parser][37318]
6918 * [Use a faster deflate setting][37298]
6919 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6920 during interning of slices][37270]
6921 * [Optimize `write_metadata`][37267]
6922 * [Don't process obligation forest cycles when stalled][37231]
6923 * [Avoid many `CrateConfig` clones][37161]
6924 * [Optimize `Substs::super_fold_with`][37108]
6925 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6926 * [Speed up `plug_leaks`][36917]
6931 * [`println!()`, with no arguments, prints newline][36825].
6932 Previously, an empty string was required to achieve the same.
6933 * [`Wrapping` impls standard binary and unary operators, as well as
6934 the `Sum` and `Product` iterators][37356]
6935 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6937 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6938 `VecDeque` iterators][37315]
6939 * [Improve `SipHasher` performance on small values][37312]
6940 * [Add Iterator trait TrustedLen to enable better FromIterator /
6942 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6943 * [`ReadDir` implements `Debug`][37221]
6944 * [Implement `RefUnwindSafe` for atomic types][37178]
6945 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6946 * [Avoid allocations in `Decoder::read_str`][37064]
6947 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6948 * [Impl `Debug` for raw pointers to unsized data][36880]
6949 * [Don't reuse `HashMap` random seeds][37470]
6950 * [The internal memory layout of `HashMap` is more cache-friendly, for
6951 significant improvements in some operations][36692]
6952 * [`HashMap` uses less memory on 32-bit architectures][36595]
6953 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6958 * [Expose rustc cfg values to build scripts][cargo/3243]
6959 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6960 * [Fix passing --features when testing multiple packages][cargo/3280]
6961 * [Use a single profile set per workspace][cargo/3249]
6962 * [Load `replace` sections from lock files][cargo/3220]
6963 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6968 * [rustup is the recommended Rust installation method][1.14rustup]
6969 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6970 S390x. These are [tier 2] platforms and may have major defects. Follow the
6971 instructions on the website to install, or add the targets to an existing
6972 installation with `rustup target add`. The new target triples are:
6973 - `mips-unknown-linux-gnu`
6974 - `mipsel-unknown-linux-gnu`
6975 - `mips64-unknown-linux-gnuabi64`
6976 - `mips64el-unknown-linux-gnuabi64 `
6977 - `powerpc-unknown-linux-gnu`
6978 - `powerpc64-unknown-linux-gnu`
6979 - `powerpc64le-unknown-linux-gnu`
6980 - `s390x-unknown-linux-gnu `
6981 * This release includes target (std) builds for ARM Linux running MUSL
6982 libc. These are [tier 2] platforms and may have major defects. Add the
6983 following triples to an existing rustup installation with `rustup target add`:
6984 - `arm-unknown-linux-musleabi`
6985 - `arm-unknown-linux-musleabihf`
6986 - `armv7-unknown-linux-musleabihf`
6987 * This release includes [experimental support for WebAssembly][1.14wasm], via
6988 the `wasm32-unknown-emscripten` target. This target is known to have major
6989 defects. Please test, report, and fix.
6990 * rustup no longer installs documentation by default. Run `rustup
6991 component add rust-docs` to install.
6992 * [Fix line stepping in debugger][37310]
6993 * [Enable line number debuginfo in releases][37280]
6998 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6999 * [Add support for Fuchsia OS][37313]
7000 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7005 * [A number of forward-compatibility lints used by the compiler
7006 to gradually introduce language changes have been converted
7007 to deny by default][36894]:
7008 - ["use of inaccessible extern crate erroneously allowed"][36886]
7009 - ["type parameter default erroneously allowed in invalid location"][36887]
7010 - ["detects super or self keywords at the beginning of global path"][36888]
7011 - ["two overlapping inherent impls define an item with the same name
7012 were erroneously allowed"][36889]
7013 - ["floating-point constants cannot be used in patterns"][36890]
7014 - ["constants of struct or enum type can only be used in a pattern if
7015 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7016 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7017 * [Prohibit patterns in trait methods without bodies][37378]
7018 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7019 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7020 * [The `$crate` macro variable is accepted in fewer locations][37213]
7021 * [Impls specifying extra region requirements beyond the trait
7022 they implement are rejected][37167]
7023 * [Enums may not be unsized][37111]. Unsized enums are intended to
7024 work but never have. For now they are forbidden.
7025 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7027 [tier 2]: https://forge.rust-lang.org/platform-support.html
7028 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7029 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7030 [36430]: https://github.com/rust-lang/rust/pull/36430
7031 [36595]: https://github.com/rust-lang/rust/pull/36595
7032 [36692]: https://github.com/rust-lang/rust/pull/36692
7033 [36767]: https://github.com/rust-lang/rust/pull/36767
7034 [36794]: https://github.com/rust-lang/rust/pull/36794
7035 [36798]: https://github.com/rust-lang/rust/pull/36798
7036 [36819]: https://github.com/rust-lang/rust/pull/36819
7037 [36822]: https://github.com/rust-lang/rust/pull/36822
7038 [36825]: https://github.com/rust-lang/rust/pull/36825
7039 [36843]: https://github.com/rust-lang/rust/pull/36843
7040 [36880]: https://github.com/rust-lang/rust/pull/36880
7041 [36886]: https://github.com/rust-lang/rust/issues/36886
7042 [36887]: https://github.com/rust-lang/rust/issues/36887
7043 [36888]: https://github.com/rust-lang/rust/issues/36888
7044 [36889]: https://github.com/rust-lang/rust/issues/36889
7045 [36890]: https://github.com/rust-lang/rust/issues/36890
7046 [36891]: https://github.com/rust-lang/rust/issues/36891
7047 [36892]: https://github.com/rust-lang/rust/issues/36892
7048 [36894]: https://github.com/rust-lang/rust/pull/36894
7049 [36917]: https://github.com/rust-lang/rust/pull/36917
7050 [36993]: https://github.com/rust-lang/rust/pull/36993
7051 [37037]: https://github.com/rust-lang/rust/pull/37037
7052 [37064]: https://github.com/rust-lang/rust/pull/37064
7053 [37094]: https://github.com/rust-lang/rust/pull/37094
7054 [37108]: https://github.com/rust-lang/rust/pull/37108
7055 [37111]: https://github.com/rust-lang/rust/pull/37111
7056 [37161]: https://github.com/rust-lang/rust/pull/37161
7057 [37162]: https://github.com/rust-lang/rust/pull/37162
7058 [37167]: https://github.com/rust-lang/rust/pull/37167
7059 [37178]: https://github.com/rust-lang/rust/pull/37178
7060 [37200]: https://github.com/rust-lang/rust/pull/37200
7061 [37213]: https://github.com/rust-lang/rust/pull/37213
7062 [37221]: https://github.com/rust-lang/rust/pull/37221
7063 [37224]: https://github.com/rust-lang/rust/pull/37224
7064 [37230]: https://github.com/rust-lang/rust/pull/37230
7065 [37231]: https://github.com/rust-lang/rust/pull/37231
7066 [37247]: https://github.com/rust-lang/rust/pull/37247
7067 [37267]: https://github.com/rust-lang/rust/pull/37267
7068 [37270]: https://github.com/rust-lang/rust/pull/37270
7069 [37273]: https://github.com/rust-lang/rust/pull/37273
7070 [37280]: https://github.com/rust-lang/rust/pull/37280
7071 [37298]: https://github.com/rust-lang/rust/pull/37298
7072 [37306]: https://github.com/rust-lang/rust/pull/37306
7073 [37310]: https://github.com/rust-lang/rust/pull/37310
7074 [37312]: https://github.com/rust-lang/rust/pull/37312
7075 [37313]: https://github.com/rust-lang/rust/pull/37313
7076 [37315]: https://github.com/rust-lang/rust/pull/37315
7077 [37318]: https://github.com/rust-lang/rust/pull/37318
7078 [37322]: https://github.com/rust-lang/rust/pull/37322
7079 [37326]: https://github.com/rust-lang/rust/pull/37326
7080 [37351]: https://github.com/rust-lang/rust/pull/37351
7081 [37356]: https://github.com/rust-lang/rust/pull/37356
7082 [37367]: https://github.com/rust-lang/rust/pull/37367
7083 [37373]: https://github.com/rust-lang/rust/pull/37373
7084 [37378]: https://github.com/rust-lang/rust/pull/37378
7085 [37389]: https://github.com/rust-lang/rust/pull/37389
7086 [37392]: https://github.com/rust-lang/rust/pull/37392
7087 [37427]: https://github.com/rust-lang/rust/pull/37427
7088 [37439]: https://github.com/rust-lang/rust/pull/37439
7089 [37445]: https://github.com/rust-lang/rust/pull/37445
7090 [37470]: https://github.com/rust-lang/rust/pull/37470
7091 [37569]: https://github.com/rust-lang/rust/pull/37569
7092 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7093 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7094 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7095 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7096 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7097 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7098 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7101 Version 1.13.0 (2016-11-10)
7102 ===========================
7107 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7108 errors, like the `try!` macro, described in [RFC 0243].
7109 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7110 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7111 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7112 * [Fix lifetime rules for 'if' conditions][36029]
7113 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7118 * [Add the `-C link-arg` argument][36574]
7119 * [Remove the old AST-based backend from rustc_trans][35764]
7120 * [Don't enable NEON by default on armv7 Linux][35814]
7121 * [Fix debug line number info for macro expansions][35238]
7122 * [Do not emit "class method" debuginfo for types that are not
7123 DICompositeType][36008]
7124 * [Warn about multiple conflicting #[repr] hints][34623]
7125 * [When sizing DST, don't double-count nested struct prefixes][36351]
7126 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7127 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7128 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7129 * [Expand macros without recursing to avoid stack overflows][36214]
7134 * [Replace macro backtraces with labeled local uses][35702]
7135 * [Improve error message for misplaced doc comments][33922]
7136 * [Buffer unix and lock windows to prevent message interleaving][35975]
7137 * [Update lifetime errors to specifically note temporaries][36171]
7138 * [Special case a few colors for Windows][36178]
7139 * [Suggest `use self` when such an import resolves][36289]
7140 * [Be more specific when type parameter shadows primitive type][36338]
7141 * Many minor improvements
7143 Compile-time Optimizations
7144 --------------------------
7146 * [Compute and cache HIR hashes at beginning][35854]
7147 * [Don't hash types in loan paths][36004]
7148 * [Cache projections in trans][35761]
7149 * [Optimize the parser's last token handling][36527]
7150 * [Only instantiate #[inline] functions in codegen units referencing
7151 them][36524]. This leads to big improvements in cases where crates export
7152 define many inline functions without using them directly.
7153 * [Lazily allocate TypedArena's first chunk][36592]
7154 * [Don't allocate during default HashSet creation][36734]
7161 * [`overflowing_abs`]
7162 * [`RefCell::try_borrow`]
7163 * [`RefCell::try_borrow_mut`]
7168 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7169 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7171 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7172 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7173 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7174 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7175 * [Use arc4rand on FreeBSD][35884]
7176 * [memrchr: Correct aligned offset computation][35969]
7177 * [Improve Demangling of Rust Symbols][36059]
7178 * [Use monotonic time in condition variables][35048]
7179 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7180 * [Implement conversion traits for `char`][35755]
7181 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7182 * [Zero first byte of CString on drop][36264]
7183 * [Inherit overflow checks for sum and product][36372]
7184 * [Add missing Eq implementations][36423]
7185 * [Implement `Debug` for `DirEntry`][36631]
7186 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7188 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7189 * [Implement more traits for `std::io::ErrorKind`][35911]
7190 * [Optimize BinaryHeap bounds checking][36072]
7191 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7192 `extend_with_element`][36355]
7193 * [Fix overflow checking in unsigned pow()][34942]
7198 * This release includes security fixes to both curl and OpenSSL.
7199 * [Fix transitive doctests when panic=abort][cargo/3021]
7200 * [Add --all-features flag to cargo][cargo/3038]
7201 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7202 * [Don't parse the home directory more than once][cargo/3078]
7203 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7204 * [Update OpenSSL to 1.0.2j][cargo/3121]
7205 * [Add license and license_file to cargo metadata output][cargo/3110]
7206 * [Make crates-io registry URL optional in config; ignore all changes to
7207 source.crates-io][cargo/3089]
7208 * [Don't download dependencies from other platforms][cargo/3123]
7209 * [Build transitive dev-dependencies when needed][cargo/3125]
7210 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7211 * [Avoid updating registry when adding existing deps][cargo/3144]
7212 * [Warn about path overrides that won't work][cargo/3136]
7213 * [Use workspaces during `cargo install`][cargo/3146]
7214 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7215 * [Add --message-format flag][cargo/3000]
7216 * [Pass target environment for rustdoc][cargo/3205]
7217 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7218 * [Update curl and curl-sys][cargo/3241]
7219 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7224 * [rustdoc: Add the `--sysroot` argument][36586]
7225 * [rustdoc: Fix a couple of issues with the search results][35655]
7226 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7227 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7228 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7233 * [Remove unmaintained style guide][35124]
7234 * [Add s390x support][36369]
7235 * [Initial work at Haiku OS support][36727]
7236 * [Add mips-uclibc targets][35734]
7237 * [Crate-ify compiler-rt into compiler-builtins][35021]
7238 * [Add rustc version info (git hash + date) to dist tarball][36213]
7239 * Many documentation improvements
7244 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7245 * [Deny (by default) transmuting from fn item types to pointer-sized
7246 types][34923]. Continuing the long transition to zero-sized fn items,
7248 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7250 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7251 * [Fix lifetime rules for 'if' conditions][36029].
7252 * [Inherit overflow checks for sum and product][36372].
7253 * [Forbid user-defined macros named "macro_rules"][36730].
7255 [33922]: https://github.com/rust-lang/rust/pull/33922
7256 [34623]: https://github.com/rust-lang/rust/pull/34623
7257 [34923]: https://github.com/rust-lang/rust/pull/34923
7258 [34942]: https://github.com/rust-lang/rust/pull/34942
7259 [35021]: https://github.com/rust-lang/rust/pull/35021
7260 [35048]: https://github.com/rust-lang/rust/pull/35048
7261 [35074]: https://github.com/rust-lang/rust/pull/35074
7262 [35124]: https://github.com/rust-lang/rust/pull/35124
7263 [35234]: https://github.com/rust-lang/rust/pull/35234
7264 [35238]: https://github.com/rust-lang/rust/pull/35238
7265 [35354]: https://github.com/rust-lang/rust/pull/35354
7266 [35559]: https://github.com/rust-lang/rust/pull/35559
7267 [35585]: https://github.com/rust-lang/rust/pull/35585
7268 [35627]: https://github.com/rust-lang/rust/pull/35627
7269 [35655]: https://github.com/rust-lang/rust/pull/35655
7270 [35702]: https://github.com/rust-lang/rust/pull/35702
7271 [35707]: https://github.com/rust-lang/rust/pull/35707
7272 [35728]: https://github.com/rust-lang/rust/pull/35728
7273 [35734]: https://github.com/rust-lang/rust/pull/35734
7274 [35755]: https://github.com/rust-lang/rust/pull/35755
7275 [35761]: https://github.com/rust-lang/rust/pull/35761
7276 [35764]: https://github.com/rust-lang/rust/pull/35764
7277 [35814]: https://github.com/rust-lang/rust/pull/35814
7278 [35854]: https://github.com/rust-lang/rust/pull/35854
7279 [35871]: https://github.com/rust-lang/rust/pull/35871
7280 [35884]: https://github.com/rust-lang/rust/pull/35884
7281 [35911]: https://github.com/rust-lang/rust/pull/35911
7282 [35969]: https://github.com/rust-lang/rust/pull/35969
7283 [35975]: https://github.com/rust-lang/rust/pull/35975
7284 [36004]: https://github.com/rust-lang/rust/pull/36004
7285 [36008]: https://github.com/rust-lang/rust/pull/36008
7286 [36014]: https://github.com/rust-lang/rust/pull/36014
7287 [36029]: https://github.com/rust-lang/rust/pull/36029
7288 [36059]: https://github.com/rust-lang/rust/pull/36059
7289 [36072]: https://github.com/rust-lang/rust/pull/36072
7290 [36101]: https://github.com/rust-lang/rust/pull/36101
7291 [36104]: https://github.com/rust-lang/rust/pull/36104
7292 [36171]: https://github.com/rust-lang/rust/pull/36171
7293 [36173]: https://github.com/rust-lang/rust/pull/36173
7294 [36178]: https://github.com/rust-lang/rust/pull/36178
7295 [36213]: https://github.com/rust-lang/rust/pull/36213
7296 [36214]: https://github.com/rust-lang/rust/pull/36214
7297 [36264]: https://github.com/rust-lang/rust/pull/36264
7298 [36266]: https://github.com/rust-lang/rust/pull/36266
7299 [36289]: https://github.com/rust-lang/rust/pull/36289
7300 [36338]: https://github.com/rust-lang/rust/pull/36338
7301 [36351]: https://github.com/rust-lang/rust/pull/36351
7302 [36355]: https://github.com/rust-lang/rust/pull/36355
7303 [36369]: https://github.com/rust-lang/rust/pull/36369
7304 [36372]: https://github.com/rust-lang/rust/pull/36372
7305 [36423]: https://github.com/rust-lang/rust/pull/36423
7306 [36482]: https://github.com/rust-lang/rust/pull/36482
7307 [36505]: https://github.com/rust-lang/rust/pull/36505
7308 [36524]: https://github.com/rust-lang/rust/pull/36524
7309 [36527]: https://github.com/rust-lang/rust/pull/36527
7310 [36551]: https://github.com/rust-lang/rust/pull/36551
7311 [36574]: https://github.com/rust-lang/rust/pull/36574
7312 [36586]: https://github.com/rust-lang/rust/pull/36586
7313 [36592]: https://github.com/rust-lang/rust/pull/36592
7314 [36631]: https://github.com/rust-lang/rust/pull/36631
7315 [36721]: https://github.com/rust-lang/rust/pull/36721
7316 [36727]: https://github.com/rust-lang/rust/pull/36727
7317 [36730]: https://github.com/rust-lang/rust/pull/36730
7318 [36734]: https://github.com/rust-lang/rust/pull/36734
7319 [36754]: https://github.com/rust-lang/rust/pull/36754
7320 [36995]: https://github.com/rust-lang/rust/pull/36995
7321 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7322 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7323 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7324 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7325 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7326 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7327 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7328 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7329 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7330 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7331 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7332 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7333 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7334 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7335 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7336 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7337 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7338 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7339 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7340 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7341 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7342 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7343 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7344 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7345 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7346 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7347 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7348 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7349 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7350 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7351 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7352 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7355 Version 1.12.1 (2016-10-20)
7356 ===========================
7361 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7362 * [Confusion with double negation and booleans][36856]
7363 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7364 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7365 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7366 * [Corrupted memory after updated to 1.12][36936]
7367 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7368 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7369 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7371 [36381]: https://github.com/rust-lang/rust/issues/36381
7372 [36856]: https://github.com/rust-lang/rust/issues/36856
7373 [36875]: https://github.com/rust-lang/rust/issues/36875
7374 [36924]: https://github.com/rust-lang/rust/issues/36924
7375 [36926]: https://github.com/rust-lang/rust/issues/36926
7376 [36936]: https://github.com/rust-lang/rust/issues/36936
7377 [37026]: https://github.com/rust-lang/rust/issues/37026
7378 [37112]: https://github.com/rust-lang/rust/issues/37112
7379 [37153]: https://github.com/rust-lang/rust/issues/37153
7382 Version 1.12.0 (2016-09-29)
7383 ===========================
7388 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7389 This translation pass is far simpler than the previous AST->LLVM pass, and
7390 creates opportunities to perform new optimizations directly on the MIR. It
7391 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7392 * [`rustc` presents a new, more readable error format, along with
7393 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7394 Most common editors supporting Rust have been updated to work with it. It was
7395 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7400 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7401 This translation pass is far simpler than the previous AST->LLVM pass, and
7402 creates opportunities to perform new optimizations directly on the MIR. It
7403 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7404 * [Print the Rust target name, not the LLVM target name, with
7405 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7406 * [The computation of `TypeId` is correct in some cases where it was previously
7407 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7408 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7409 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7410 `--print relocation-models`, and `--print code-models` print the available
7411 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7412 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7413 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7414 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7415 These targets produce statically-linked binaries. There are no binary release
7421 * [`rustc` presents a new, more readable error format, along with
7422 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7423 Most common editors supporting Rust have been updated to work with it. It was
7424 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7425 * [In error descriptions, references are now described in plain English,
7426 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7427 * [In error type descriptions, unknown numeric types are named `{integer}` or
7428 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7429 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7434 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7435 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7436 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7437 useful](https://github.com/rust-lang/rust/pull/34908)
7438 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7439 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7440 * [Semicolons are properly required as statement delimiters inside
7441 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7442 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7447 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7448 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7449 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7450 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7451 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7452 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7453 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7454 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7455 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7456 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7457 Both on Unix and Windows.
7458 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7459 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7460 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7461 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7462 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7463 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7464 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7465 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7470 * [The `format!` macro and friends now allow a single argument to be formatted
7471 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7472 * [The lifetime bounds on `[T]::binary_search_by` and
7473 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7474 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7475 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7476 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7477 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7478 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7479 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7480 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7481 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7482 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7483 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7484 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7485 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7486 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7487 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7488 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7489 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7490 * [`mpsc::sync_channel` `Receiver`s return any available message before
7491 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7492 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7493 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7498 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7499 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7500 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7501 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7502 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7503 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7504 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7505 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7506 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7507 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7508 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7509 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7510 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7511 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7512 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7513 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7518 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7519 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7524 * [Test binaries now support a `--test-threads` argument to specify the number
7525 of threads used to run tests, and which acts the same as the
7526 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7527 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7528 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7529 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7530 * [Rust releases now come with source packages that can be installed by rustup
7531 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7532 The resulting source code can be used by tools and IDES, located in the
7533 sysroot under `lib/rustlib/src`.
7538 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7539 * Many minor improvements to the documentation.
7540 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7545 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7546 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7547 * [When formatting strings, if "precision" is specified, the "fill",
7548 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7549 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7552 Version 1.11.0 (2016-08-18)
7553 ===========================
7558 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7559 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7560 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7561 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7566 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7567 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7568 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7569 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7570 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7571 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7572 (in libcore - previously stabilized in libstd)
7573 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7574 (in libcore - previously stabilized in libstd)
7575 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7576 (in libcore - previously stabilized in libstd)
7577 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7578 (in libcore - previously stabilized in libstd)
7579 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7580 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7581 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7582 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7587 * [The `thread_local!` macro supports multiple definitions in a single
7588 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7589 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7590 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7591 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7592 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7593 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7594 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7595 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7600 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7601 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7602 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7603 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7604 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7605 and `-vv` prints warnings for all crates.
7606 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7607 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7608 This provides room for expansion by arbitrary tools.
7609 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7610 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7611 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7612 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7613 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7614 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7615 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7620 * [Caching projections speeds up type check dramatically for some
7621 workloads](https://github.com/rust-lang/rust/pull/33816)
7622 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7623 This hasher is faster, but is believed to provide sufficient
7624 protection from collision attacks.
7625 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7630 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7631 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7632 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7633 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7634 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7639 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7640 * [When emitting debug info, rustc emits frame pointers for closures,
7641 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7642 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7643 * Many more errors have been given error codes and extended
7645 * API documentation continues to be improved, with many new examples
7650 * [rustc no longer hangs when dependencies recursively re-export
7651 submodules](https://github.com/rust-lang/rust/pull/34542)
7652 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7653 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7654 rewritten](https://github.com/rust-lang/rust/pull/33895)
7655 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7656 No targets use this yet, but it works toward AVR support.
7661 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7662 * [The new follow-set rules that place restrictions on `macro_rules!`
7663 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7664 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7665 and has been a warning since 1.10.
7666 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7667 This causes breakage in some corner cases.
7670 Version 1.10.0 (2016-07-07)
7671 ===========================
7676 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7677 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7678 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7679 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7680 * [`panic!` can be converted to a runtime abort with the
7681 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7682 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7683 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7684 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7685 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7686 Note that Cargo does not yet directly support cdylibs.
7691 * `os::windows::fs::OpenOptionsExt::access_mode`
7692 * `os::windows::fs::OpenOptionsExt::share_mode`
7693 * `os::windows::fs::OpenOptionsExt::custom_flags`
7694 * `os::windows::fs::OpenOptionsExt::attributes`
7695 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7696 * `os::unix::fs::OpenOptionsExt::custom_flags`
7697 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7698 * `Default for sync::Weak`
7699 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7700 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7701 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7702 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7703 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7704 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7705 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7706 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7707 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7708 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7709 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7710 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7711 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7712 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7713 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7714 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7715 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7716 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7717 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7718 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7719 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7720 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7721 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7722 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7723 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7724 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7725 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7726 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7727 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7728 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7729 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7730 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7731 * Read/Write/RawFd impls for `UnixStream`
7732 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7733 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7734 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7735 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7736 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7737 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7738 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7739 * RawFd impls for `UnixListener`
7740 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7741 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7742 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7743 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7744 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7745 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7746 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7747 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7748 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7749 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7750 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7751 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7752 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7753 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7754 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7755 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7756 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7757 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7758 * RawFd impls for `UnixDatagram`
7759 * `{BTree,Hash}Map::values_mut`
7760 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7765 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7766 The semantics of this minor method are subtle and probably not what
7768 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7769 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7770 will fall back to `/dev/urandom` temporarily to avoid blocking
7771 during early boot](https://github.com/rust-lang/rust/pull/33086).
7772 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7773 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7774 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7775 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7776 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7777 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7778 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7782 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7783 This controls the runtime behavior of the `panic!` macro
7784 and can be either "unwind" (the default), or "abort".
7785 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7786 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7787 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7788 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7789 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7790 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7791 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7792 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7793 By default they are retried twice, which can be customized with the
7794 `net.retry` value in `.cargo/config`.
7795 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7796 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7797 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7798 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7799 Makes it possible to install multiple crates in parallel.
7800 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7801 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7802 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7803 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7804 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7805 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7810 * [rustc memory usage was reduced by refactoring the context used for
7811 type checking](https://github.com/rust-lang/rust/pull/33425).
7812 * [Speed up creation of `HashMap`s by caching the random keys used
7813 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7814 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7815 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7816 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7817 10x faster than the previous lookup tables.
7818 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7823 * Many incremental improvements to documentation and rustdoc.
7824 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7825 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7826 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7827 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7828 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7829 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7830 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7835 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7836 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7837 * [`std` no longer prints backtraces on platforms where the running
7838 module must be loaded with `env::current_exe`, which can't be relied
7839 on](https://github.com/rust-lang/rust/pull/33554).
7840 * This release includes std binaries for the i586-unknown-linux-gnu,
7841 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7842 i586 target is for old x86 hardware without SSE2, and the armv7
7843 target is for Android running on modern ARM architectures.
7844 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7845 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7846 * [On Unix the runtime aborts by calling `libc::abort` instead of
7847 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7848 * [Rust is now bootstrapped from the previous release of Rust,
7849 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7854 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7855 * [`target_env` for Linux ARM targets is just `gnu`, not
7856 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7857 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7858 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7859 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7860 Affects how macros are parsed.
7861 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7862 * [Feature-gated attributes on macro-generated macro invocations are
7863 now rejected](https://github.com/rust-lang/rust/pull/32791).
7864 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7865 This caused some minor changes to type inference.
7868 Version 1.9.0 (2016-05-26)
7869 ==========================
7874 * The `#[deprecated]` attribute when applied to an API will generate
7875 warnings when used. The warnings may be suppressed with
7876 `#[allow(deprecated)]`. [RFC 1270].
7877 * [`fn` item types are zero sized, and each `fn` names a unique
7878 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7879 `transmute` on a `fn` type will generate a warning for a few cycles,
7880 then will be converted to an error.
7881 * [Field and method resolution understand visibility, so private
7882 fields and methods cannot prevent the proper use of public fields
7883 and methods][1.9fv].
7884 * [The parser considers unicode codepoints in the
7885 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7891 * [`std::panic::catch_unwind`] (renamed from `recover`)
7892 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7893 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7894 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7895 * [`str::is_char_boundary`]
7896 * [`<*const T>::as_ref`]
7897 * [`<*mut T>::as_ref`]
7898 * [`<*mut T>::as_mut`]
7899 * [`AsciiExt::make_ascii_uppercase`]
7900 * [`AsciiExt::make_ascii_lowercase`]
7901 * [`char::decode_utf16`]
7902 * [`char::DecodeUtf16`]
7903 * [`char::DecodeUtf16Error`]
7904 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7905 * [`BTreeSet::take`]
7906 * [`BTreeSet::replace`]
7909 * [`HashSet::replace`]
7911 * [`OsString::with_capacity`]
7912 * [`OsString::clear`]
7913 * [`OsString::capacity`]
7914 * [`OsString::reserve`]
7915 * [`OsString::reserve_exact`]
7916 * [`OsStr::is_empty`]
7918 * [`std::os::unix::thread`]
7921 * [`JoinHandleExt::as_pthread_t`]
7922 * [`JoinHandleExt::into_pthread_t`]
7923 * [`HashSet::hasher`]
7924 * [`HashMap::hasher`]
7925 * [`CommandExt::exec`]
7926 * [`File::try_clone`]
7927 * [`SocketAddr::set_ip`]
7928 * [`SocketAddr::set_port`]
7929 * [`SocketAddrV4::set_ip`]
7930 * [`SocketAddrV4::set_port`]
7931 * [`SocketAddrV6::set_ip`]
7932 * [`SocketAddrV6::set_port`]
7933 * [`SocketAddrV6::set_flowinfo`]
7934 * [`SocketAddrV6::set_scope_id`]
7935 * [`slice::copy_from_slice`]
7936 * [`ptr::read_volatile`]
7937 * [`ptr::write_volatile`]
7938 * [`OpenOptions::create_new`]
7939 * [`TcpStream::set_nodelay`]
7940 * [`TcpStream::nodelay`]
7941 * [`TcpStream::set_ttl`]
7942 * [`TcpStream::ttl`]
7943 * [`TcpStream::set_only_v6`]
7944 * [`TcpStream::only_v6`]
7945 * [`TcpStream::take_error`]
7946 * [`TcpStream::set_nonblocking`]
7947 * [`TcpListener::set_ttl`]
7948 * [`TcpListener::ttl`]
7949 * [`TcpListener::set_only_v6`]
7950 * [`TcpListener::only_v6`]
7951 * [`TcpListener::take_error`]
7952 * [`TcpListener::set_nonblocking`]
7953 * [`UdpSocket::set_broadcast`]
7954 * [`UdpSocket::broadcast`]
7955 * [`UdpSocket::set_multicast_loop_v4`]
7956 * [`UdpSocket::multicast_loop_v4`]
7957 * [`UdpSocket::set_multicast_ttl_v4`]
7958 * [`UdpSocket::multicast_ttl_v4`]
7959 * [`UdpSocket::set_multicast_loop_v6`]
7960 * [`UdpSocket::multicast_loop_v6`]
7961 * [`UdpSocket::set_multicast_ttl_v6`]
7962 * [`UdpSocket::multicast_ttl_v6`]
7963 * [`UdpSocket::set_ttl`]
7964 * [`UdpSocket::ttl`]
7965 * [`UdpSocket::set_only_v6`]
7966 * [`UdpSocket::only_v6`]
7967 * [`UdpSocket::join_multicast_v4`]
7968 * [`UdpSocket::join_multicast_v6`]
7969 * [`UdpSocket::leave_multicast_v4`]
7970 * [`UdpSocket::leave_multicast_v6`]
7971 * [`UdpSocket::take_error`]
7972 * [`UdpSocket::connect`]
7973 * [`UdpSocket::send`]
7974 * [`UdpSocket::recv`]
7975 * [`UdpSocket::set_nonblocking`]
7980 * [`std::sync::Once` is poisoned if its initialization function
7982 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7983 * [Most types implement `fmt::Debug`][1.9db].
7984 * [The default buffer size used by `BufReader` and `BufWriter` was
7985 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7986 used by other languages.
7987 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7988 `Duration` additionally implements `*=` and `/=`][1.9ta].
7989 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7990 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7991 * [`Chain` implements `BufRead`][1.9ch].
7992 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7997 * [Cargo can now run concurrently][1.9cc].
7998 * [Top-level overrides allow specific revisions of crates to be
7999 overridden through the entire crate graph][1.9ct]. This is intended
8000 to make upgrades easier for large projects, by allowing crates to be
8001 forked temporarily until they've been upgraded and republished.
8002 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8003 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8004 on the commandline][1.9cf]. `rustc` arguments can also be specified
8005 in the `build.rustflags` configuration key.
8010 * [The time complexity of comparing variables for equivalence during type
8011 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8012 to major compilation time improvement in some scenarios.
8013 * [`ToString` is specialized for `str`, giving it the same performance
8014 as `to_owned`][1.9ts].
8015 * [Spawning processes with `Command::output` no longer creates extra
8017 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8018 for C-like enums][1.9cl].
8023 * [Passing the `--quiet` flag to a test runner will produce
8024 much-abbreviated output][1.9q].
8025 * The Rust Project now publishes std binaries for the
8026 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8027 `i586-pc-windows-msvc` targets.
8032 * [`std::sync::Once` is poisoned if its initialization function
8034 * [It is illegal to define methods with the same name in overlapping
8035 inherent `impl` blocks][1.9sn].
8036 * [`fn` item types are zero sized, and each `fn` names a unique
8037 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8038 `transmute` on a `fn` type will generate a warning for a few cycles,
8039 then will be converted to an error.
8040 * [Improvements to const evaluation may trigger new errors when integer
8041 literals are out of range][1.9ce].
8044 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8045 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8046 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8047 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8048 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8049 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8050 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8051 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8052 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8053 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8054 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8055 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8056 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8057 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8058 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8059 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8060 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8061 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8062 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8063 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8064 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8065 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8066 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8067 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8068 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8069 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8070 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8071 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8072 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8073 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8074 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8075 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8076 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8077 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8078 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8079 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8080 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8081 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8082 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8083 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8084 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8085 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8086 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8087 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8088 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8089 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8090 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8091 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8092 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8093 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8094 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8095 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8096 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8097 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8098 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8099 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8100 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8101 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8102 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8103 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8104 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8105 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8106 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8107 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8108 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8109 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8110 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8111 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8112 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8113 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8114 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8115 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8116 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8117 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8118 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8119 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8120 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8121 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8122 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8123 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8124 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8125 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8126 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8127 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8128 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8129 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8130 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8131 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8132 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8133 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8134 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8135 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8136 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8137 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8138 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8139 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8140 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8141 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8142 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8143 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8144 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8145 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8146 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8147 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8148 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8149 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8150 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8151 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8152 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8153 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8156 Version 1.8.0 (2016-04-14)
8157 ==========================
8162 * Rust supports overloading of compound assignment statements like
8163 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8164 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8165 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8167 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8168 addition to the non-braced form, `struct Foo;`. [RFC 218].
8174 * [`str::encode_utf16`] (renamed from `utf16_units`)
8175 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8178 * [`ptr::drop_in_place`]
8180 * [`time::SystemTime`]
8182 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8183 * [`Instant::elapsed`]
8184 * [`SystemTime::now`]
8185 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8186 * [`SystemTime::elapsed`]
8187 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8188 * [`SystemTimeError`]
8189 * [`SystemTimeError::duration`]
8190 * Various impls for `SystemTimeError`
8192 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8193 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8194 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8195 * [The `write!` and `writeln!` macros correctly emit errors if any of
8196 their arguments can't be formatted][1.8w].
8197 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8198 * [The Unix-specific `raw` modules, which contain a number of
8199 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8200 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8201 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8202 across platforms was making it difficult to implement `std`
8203 correctly. Those that need these definitions should use the `libc`
8205 * The Unix-specific `MetadataExt` traits, including
8206 `os::unix::fs::MetadataExt`, which expose values such as inode
8207 numbers [no longer return platform-specific types][1.8r], but
8208 instead return widened integers. [RFC 1415].
8209 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8210 * [Atomic loads and stores are not volatile][1.8a].
8211 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8216 * [Inlining hash functions lead to a 3% compile-time improvement in
8217 some workloads][1.8h].
8218 * When using jemalloc, its symbols are [unprefixed so that it
8219 overrides the libc malloc implementation][1.8h]. This means that for
8220 rustc, LLVM is now using jemalloc, which results in a 6%
8221 compile-time improvement on a specific workload.
8222 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8227 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8228 i686-pc-windows-msvc is now considered a tier-1 platform.
8229 * [The `--print targets` flag prints a list of supported targets][1.8t].
8230 * [The `--print cfg` flag prints the `cfg`s defined for the current
8232 * [`rustc` can be built with an new Cargo-based build system, written
8233 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8234 build system. To enable it configure with `configure --rustbuild`.
8235 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8236 variants while also indicating the total number of missing variants
8237 if more than 3][1.8m].
8238 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8239 * The Rust Project now publishes binary releases of the standard
8240 library for a number of tier-2 targets:
8241 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8242 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8243 `x86_64-rumprun-netbsd`. These can be installed with
8244 tools such as [multirust][1.8mr].
8249 * [`cargo init` creates a new Cargo project in the current
8250 directory][1.8ci]. It is otherwise like `cargo new`.
8251 * [Cargo has configuration keys for `-v` and
8252 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8253 `[term]` section of `.cargo/config`.
8254 * [Configuration keys that evaluate to strings or integers can be set
8255 via environment variables][1.8ce]. For example the `build.jobs` key
8256 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8257 precedence over config files.
8258 * [Target-specific dependencies support Rust `cfg` syntax for
8259 describing targets][1.8cfg] so that dependencies for multiple
8260 targets can be specified together. [RFC 1361].
8261 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8262 `RUSTDOC` take precedence over the `build.target-dir`,
8263 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8264 * [The child process tree is killed on Windows when Cargo is
8266 * [The `build.target` configuration value sets the target platform,
8267 like `--target`][1.8ct].
8272 * [Unstable compiler flags have been further restricted][1.8u]. Since
8273 1.0 `-Z` flags have been considered unstable, and other flags that
8274 were considered unstable additionally required passing `-Z
8275 unstable-options` to access. Unlike unstable language and library
8276 features though, these options have been accessible on the stable
8277 release channel. Going forward, *new unstable flags will not be
8278 available on the stable release channel*, and old unstable flags
8279 will warn about their usage. In the future, all unstable flags will
8280 be unavailable on the stable release channel.
8281 * [It is no longer possible to `match` on empty enum variants using
8282 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8283 * The Unix-specific `MetadataExt` traits, including
8284 `os::unix::fs::MetadataExt`, which expose values such as inode
8285 numbers [no longer return platform-specific types][1.8r], but
8286 instead return widened integers. [RFC 1415].
8287 * [Modules sourced from the filesystem cannot appear within arbitrary
8288 blocks, but only within other modules][1.8mf].
8289 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8290 * On Unix, [stack overflow triggers a runtime abort instead of a
8292 * [`Command::spawn` and its equivalents return an error if any of
8293 its command-line arguments contain interior `NUL`s][1.8n].
8294 * [Tuple and unit enum variants from other crates are in the type
8296 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8297 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8298 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8299 instead of `foo.lib`.
8302 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8303 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8304 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8305 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8306 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8307 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8308 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8309 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8310 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8311 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8312 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8313 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8314 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8315 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8316 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8317 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8318 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8319 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8320 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8321 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8322 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8323 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8324 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8325 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8326 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8327 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8328 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8329 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8330 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8331 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8332 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8333 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8334 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8335 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8336 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8337 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8338 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8339 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8340 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8341 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8342 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8343 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8344 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8345 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8346 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8347 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8348 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8349 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8350 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8351 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8352 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8353 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8354 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8355 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8356 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8357 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8358 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8359 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8360 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8361 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8364 Version 1.7.0 (2016-03-03)
8365 ==========================
8372 * [`Path::strip_prefix`] (renamed from relative_from)
8373 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8375 * [`Ipv4Addr::is_loopback`]
8376 * [`Ipv4Addr::is_private`]
8377 * [`Ipv4Addr::is_link_local`]
8378 * [`Ipv4Addr::is_multicast`]
8379 * [`Ipv4Addr::is_broadcast`]
8380 * [`Ipv4Addr::is_documentation`]
8382 * [`Ipv6Addr::is_unspecified`]
8383 * [`Ipv6Addr::is_loopback`]
8384 * [`Ipv6Addr::is_multicast`]
8387 * [`Vec::as_mut_slice`]
8389 * [`String::as_str`]
8390 * [`String::as_mut_str`]
8392 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8394 * `<[T]>::`[`sort_by_key`]
8395 * checked, saturated, and overflowing operations
8396 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8397 * [`i32::saturating_mul`]
8398 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8399 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8400 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8401 * [`u32::saturating_mul`]
8402 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8403 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8404 * and checked, saturated, and overflowing operations for other primitive types
8406 * [`ffi::IntoStringError`]
8407 * [`CString::into_string`]
8408 * [`CString::into_bytes`]
8409 * [`CString::into_bytes_with_nul`]
8410 * `From<CString> for Vec<u8>`
8412 * [`IntoStringError::into_cstring`]
8413 * [`IntoStringError::utf8_error`]
8414 * `Error for IntoStringError`
8416 * [`std::hash::BuildHasher`]
8417 * [`BuildHasher::Hasher`]
8418 * [`BuildHasher::build_hasher`]
8419 * [`std::hash::BuildHasherDefault`]
8420 * [`HashMap::with_hasher`]
8421 * [`HashMap::with_capacity_and_hasher`]
8422 * [`HashSet::with_hasher`]
8423 * [`HashSet::with_capacity_and_hasher`]
8424 * [`std::collections::hash_map::RandomState`]
8425 * [`RandomState::new`]
8426 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8427 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8428 from bytes is faster.
8429 * [The performance of `LineWriter` (and thus `io::stdout`) was
8430 improved by using `memchr` to search for newlines][1.7m].
8431 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8432 `f64` variants were stabilized previously.
8433 * [`BTreeMap` was rewritten to use less memory and improve the performance
8434 of insertion and iteration, the latter by as much as 5x][1.7bm].
8435 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8436 covariant over their contained type][1.7bt].
8437 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8438 over their contained type][1.7ll].
8439 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8441 * [`Any` is implemented for unsized types][1.7a].
8442 * [`Hash` is implemented for `Duration`][1.7h].
8447 * [When running tests with `--test`, rustdoc will pass `--cfg`
8448 arguments to the compiler][1.7dt].
8449 * [The compiler is built with RPATH information by default][1.7rpa].
8450 This means that it will be possible to run `rustc` when installed in
8451 unusual configurations without configuring the dynamic linker search
8453 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8454 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8455 over `LD_LIBRARY_PATH`.
8460 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8461 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8462 * [The `rerun-if-changed` build script directive no longer causes the
8463 build script to incorrectly run twice in certain scenarios][1.7rr].
8468 * Soundness fixes to the interactions between associated types and
8469 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8470 code that violates the new rules. This is a significant change that
8471 is known to break existing code, so it has emitted warnings for the
8472 new error cases since 1.4 to give crate authors time to adapt. The
8473 details of what is changing are subtle; read the RFC for more.
8474 * [Several bugs in the compiler's visibility calculations were
8475 fixed][1.7v]. Since this was found to break significant amounts of
8476 code, the new errors will be emitted as warnings for several release
8477 cycles, under the `private_in_public` lint.
8478 * Defaulted type parameters were accidentally accepted in positions
8479 that were not intended. In this release, [defaulted type parameters
8480 appearing outside of type definitions will generate a
8481 warning][1.7d], which will become an error in future releases.
8482 * [Parsing "." as a float results in an error instead of 0][1.7p].
8483 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8484 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8486 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8487 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8488 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8489 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8490 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8491 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8492 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8493 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8494 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8495 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8496 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8497 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8498 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8499 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8500 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8501 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8502 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8503 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8504 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8505 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8506 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8507 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8508 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8509 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8510 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8511 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8512 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8513 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8514 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8515 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8516 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8517 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8518 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8519 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8520 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8521 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8522 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8523 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8524 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8525 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8526 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8527 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8528 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8529 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8530 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8531 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8532 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8533 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8534 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8535 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8536 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8537 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8538 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8539 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8540 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8541 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8542 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8543 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8544 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8545 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8546 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8547 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8548 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8549 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8550 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8551 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8552 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8553 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8554 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8555 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8556 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8557 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8558 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8559 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8560 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8561 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8562 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8563 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8564 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8567 Version 1.6.0 (2016-01-21)
8568 ==========================
8573 * The `#![no_std]` attribute causes a crate to not be linked to the
8574 standard library, but only the [core library][1.6co], as described
8575 in [RFC 1184]. The core library defines common types and traits but
8576 has no platform dependencies whatsoever, and is the basis for Rust
8577 software in environments that cannot support a full port of the
8578 standard library, such as operating systems. Most of the core
8579 library is now stable.
8585 [`Read::read_exact`],
8586 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8587 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8588 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8589 [`os::unix::fs::DirBuilderExt`],
8590 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8591 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8592 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8593 [`collections::hash_map::Drain`],
8594 [`collections::hash_map::HashMap::drain`],
8595 [`collections::hash_set::Drain`],
8596 [`collections::hash_set::HashSet::drain`],
8597 [`collections::binary_heap::Drain`],
8598 [`collections::binary_heap::BinaryHeap::drain`],
8599 [`Vec::extend_from_slice`] (renamed from `push_all`),
8600 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8601 [`RwLock::into_inner`],
8602 [`Iterator::min_by_key`] (renamed from `min_by`),
8603 [`Iterator::max_by_key`] (renamed from `max_by`).
8604 * The [core library][1.6co] is stable, as are most of its APIs.
8605 * [The `assert_eq!` macro supports arguments that don't implement
8606 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8608 * Several timer functions that take duration in milliseconds [are
8609 deprecated in favor of those that take `Duration`][1.6ms]. These
8610 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8611 `thread::park_timeout_ms`.
8612 * The algorithm by which `Vec` reserves additional elements was
8613 [tweaked to not allocate excessive space][1.6a] while still growing
8615 * `From` conversions are [implemented from integers to floats][1.6f]
8616 in cases where the conversion is lossless. Thus they are not
8617 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8618 or `f64`. They are also not implemented for `isize` and `usize`
8619 because the implementations would be platform-specific. `From` is
8620 also implemented from `f32` to `f64`.
8621 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8622 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8623 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8624 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8626 * Sorting slices that are already sorted [is 50% faster in some
8632 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8633 * Cargo build scripts can specify their dependencies by emitting the
8634 [`rerun-if-changed`][1.6rr] key.
8635 * crates.io will reject publication of crates with dependencies that
8636 have a wildcard version constraint. Crates with wildcard
8637 dependencies were seen to cause a variety of problems, as described
8638 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8640 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8641 release folder. A variety of artifacts that Cargo failed to clean
8642 are now correctly deleted.
8647 * The `unreachable_code` lint [warns when a function call's argument
8649 * The parser indicates [failures that may be caused by
8650 confusingly-similar Unicode characters][1.6uc]
8651 * Certain macro errors [are reported at definition time][1.6m], not
8657 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8658 environment variable when locating crates. This was a pre-cargo
8659 feature for integrating with the package manager that was
8660 accidentally never removed.
8661 * [A number of bugs were fixed in the privacy checker][1.6p] that
8662 could cause previously-accepted code to break.
8663 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8664 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8665 struct pattern syntax (`Foo(..)`) can no longer be used to match
8666 unit structs. This is a warning now, but will become an error in
8667 future releases. Patterns that share the same name as a const are
8669 * A bug was fixed that causes [rustc not to apply default type
8670 parameters][1.6xc] when resolving certain method implementations of
8671 traits defined in other crates.
8673 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8674 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8675 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8676 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8677 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8678 [1.6co]: http://doc.rust-lang.org/core/index.html
8679 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8680 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8681 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8682 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8683 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8684 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8685 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8686 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8687 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8688 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8689 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8690 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8691 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8692 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8693 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8694 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8695 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8696 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8697 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8698 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8699 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8700 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8701 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8702 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8703 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8704 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8705 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8706 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8707 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8708 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8709 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8710 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8711 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8712 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8713 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8714 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8715 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8716 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8717 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8718 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8719 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8722 Version 1.5.0 (2015-12-10)
8723 ==========================
8725 * ~700 changes, numerous bugfixes
8731 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8732 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8733 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8734 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8735 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8736 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8737 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8738 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8739 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8740 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8741 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8742 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8743 [`Path::read_link`], [`Path::symlink_metadata`],
8744 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8745 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8746 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8747 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8748 [`slice::split_first_mut`], [`slice::split_first`],
8749 [`slice::split_last_mut`], [`slice::split_last`],
8750 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8751 [`str::MatchIndices`], [`str::RMatchIndices`],
8752 [`str::match_indices`], [`str::rmatch_indices`],
8753 [`str::slice_mut_unchecked`], [`string::ParseError`].
8754 * Rust applications hosted on crates.io can be installed locally to
8755 `~/.cargo/bin` with the [`cargo install`] command. Among other
8756 things this makes it easier to augment Cargo with new subcommands:
8757 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8758 invoked as `cargo foo`.
8759 * Crates with wildcard (`*`) dependencies will [emit warnings when
8760 published][1.5w]. In 1.6 it will no longer be possible to publish
8761 crates with wildcard dependencies.
8766 * The rules determining when a particular lifetime must outlive
8767 a particular value (known as '[dropck]') have been [modified
8768 to not rely on parametricity][1.5p].
8769 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8770 and `Arc`][1.5a]. Because these smart pointer types implement
8771 `Deref`, this causes breakage in cases where the interior type
8772 contains methods of the same name.
8773 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8774 that they could drop their content. Soundness fix.
8775 * All method invocations are [properly checked][1.5wf1] for
8776 [well-formedness][1.5wf2]. Soundness fix.
8777 * Traits whose supertraits contain `Self` are [not object
8778 safe][1.5o]. Soundness fix.
8779 * Target specifications support a [`no_default_libraries`][1.5nd]
8780 setting that controls whether `-nodefaultlibs` is passed to the
8781 linker, and in turn the `is_like_windows` setting no longer affects
8782 the `-nodefaultlibs` flag.
8783 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8784 * The `#[inline]` and `#[repr]` attributes [can only appear
8785 in valid locations][1.5at].
8786 * Native libraries linked from the local crate are [passed to
8787 the linker before native libraries from upstream crates][1.5nl].
8788 * Two rarely-used attributes, `#[no_debug]` and
8789 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8790 * Negation of unsigned integers, which has been a warning for
8791 several releases, [is now behind a feature gate and will
8792 generate errors][1.5nu].
8793 * The parser accidentally accepted visibility modifiers on
8794 enum variants, a bug [which has been fixed][1.5ev].
8795 * [A bug was fixed that allowed `use` statements to import unstable
8801 * When evaluating expressions at compile-time that are not
8802 compile-time constants (const-evaluating expressions in non-const
8803 contexts), incorrect code such as overlong bitshifts and arithmetic
8804 overflow will [generate a warning instead of an error][1.5ce],
8805 delaying the error until runtime. This will allow the
8806 const-evaluator to be expanded in the future backwards-compatibly.
8807 * The `improper_ctypes` lint [no longer warns about using `isize` and
8808 `usize` in FFI][1.5ict].
8813 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8815 * `Default` is [implemented for mutable slices][1.5d].
8816 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8817 * There are now `From` conversions [between floating point
8818 types][1.5f] where the conversions are lossless.
8819 * There are now `From` conversions [between integer types][1.5i] where
8820 the conversions are lossless.
8821 * [`fs::Metadata` implements `Clone`][1.5fs].
8822 * The `parse` method [accepts a leading "+" when parsing
8824 * [`AsMut` is implemented for `Vec`][1.5am].
8825 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8826 been optimized][1.5cf] and no longer rely on the default impl.
8827 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8828 `unsafe extern "C"` function types now [implement `Clone`,
8829 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8830 `fmt::Debug` for up to 12 arguments][1.5fp].
8831 * [Dropping `Vec`s is much faster in unoptimized builds when the
8832 element types don't implement `Drop`][1.5dv].
8833 * A bug that caused in incorrect behavior when [combining `VecDeque`
8834 with zero-sized types][1.5vdz] was resolved.
8835 * [`PartialOrd` for slices is faster][1.5po].
8840 * [Crate metadata size was reduced by 20%][1.5md].
8841 * [Improvements to code generation reduced the size of libcore by 3.3
8842 MB and rustc's memory usage by 18MB][1.5m].
8843 * [Improvements to deref translation increased performance in
8844 unoptimized builds][1.5dr].
8845 * Various errors in trait resolution [are deduplicated to only be
8846 reported once][1.5te].
8847 * Rust has preliminary [support for rumprun kernels][1.5rr].
8848 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8850 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8851 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8852 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8853 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8854 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8855 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8856 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8857 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8858 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8859 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8860 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8861 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8862 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8863 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8864 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8865 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8866 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8867 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8868 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8869 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8870 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8871 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8872 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8873 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8874 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8875 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8876 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8877 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8878 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8879 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8880 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8881 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8882 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8883 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8884 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8885 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8886 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8887 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8888 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8889 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8890 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8891 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8892 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8893 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8894 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8895 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8896 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8897 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8898 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8899 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8900 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8901 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8902 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8903 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8904 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8905 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8906 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8907 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8908 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8909 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8910 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8911 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8912 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8913 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8914 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8915 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8916 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8917 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8918 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8919 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8920 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8921 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8922 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8923 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8924 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8925 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8926 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8927 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8928 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8929 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8930 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8931 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8932 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8933 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8934 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8935 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8936 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8937 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8938 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8940 Version 1.4.0 (2015-10-29)
8941 ==========================
8943 * ~1200 changes, numerous bugfixes
8948 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8949 GNU) are now supported and recommended for use.
8954 * [Several changes have been made to fix type soundness and improve
8955 the behavior of associated types][sound]. See [RFC 1214]. Although
8956 we have mostly introduced these changes as warnings this release, to
8957 become errors next release, there are still some scenarios that will
8958 see immediate breakage.
8959 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8960 line breaks in addition to `\n`][crlf].
8961 * [Loans of `'static` lifetime extend to the end of a function][stat].
8962 * [`str::parse` no longer introduces avoidable rounding error when
8963 parsing floating point numbers. Together with earlier changes to
8964 float formatting/output, "round trips" like f.to_string().parse()
8965 now preserve the value of f exactly. Additionally, leading plus
8966 signs are now accepted][fp3].
8972 * `use` statements that import multiple items [can now rename
8973 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8974 * [Binops work correctly on fat pointers][binfat].
8975 * `pub extern crate`, which does not behave as expected, [issues a
8976 warning][pec] until a better solution is found.
8981 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8982 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8983 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8984 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8985 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8986 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8987 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8988 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8989 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8990 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8991 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8992 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8993 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8994 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8995 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8996 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8997 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8998 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9000 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9001 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9002 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9003 `f64::from_str_radix`.
9004 * [Reverse-searching strings is faster with the 'two-way'
9006 * [`std::io::copy` allows `?Sized` arguments][cc].
9007 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9008 [override `count`, `nth` and `last` with an *O*(1)
9009 implementation][it].
9010 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9011 * [`IntoRawFd` has been added to the Unix-specific prelude,
9012 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9014 * [`Extend<String>` and `FromIterator<String` are both implemented for
9016 * [`IntoIterator` is implemented for references to `Option` and
9018 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9019 Copy`][ext] as part of [RFC 839]. This will cause type inference
9020 breakage in rare situations.
9021 * [`BinaryHeap` implements `Debug`][bh2].
9022 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9024 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9025 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9026 * [String comparison is faster][faststr].
9027 * `&mut T` where `T: std::fmt::Write` [also implements
9028 `std::fmt::Write`][mutw].
9029 * [A stable regression in `VecDeque::push_back` and other
9030 capacity-altering methods that caused panics for zero-sized types
9032 * [Function pointers implement traits for up to 12 parameters][fp2].
9037 * The compiler [no longer uses the 'morestack' feature to prevent
9038 stack overflow][mm]. Instead it uses guard pages and stack
9039 probes (though stack probes are not yet implemented on any platform
9041 * [The compiler matches traits faster when projections are involved][p].
9042 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9044 * [Cargo now displays useful information about what its doing during
9045 `cargo update`][cu].
9047 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9048 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9049 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9050 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9051 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9052 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9053 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9054 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9055 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9056 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9057 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9058 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9059 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9060 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9061 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9062 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9063 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9064 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9065 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9066 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9067 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9068 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9069 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9070 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9071 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9072 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9073 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9074 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9075 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9076 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9077 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9078 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9079 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9080 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9081 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9082 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9083 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9084 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9085 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9086 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9087 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9088 [bh2]: https://github.com/rust-lang/rust/pull/28156
9089 [binfat]: https://github.com/rust-lang/rust/pull/28270
9090 [bm]: https://github.com/rust-lang/rust/pull/28197
9091 [cc]: https://github.com/rust-lang/rust/pull/27531
9092 [crlf]: https://github.com/rust-lang/rust/pull/28034
9093 [cu]: https://github.com/rust-lang/cargo/pull/1931
9094 [d]: https://github.com/rust-lang/rust/pull/27825
9095 [dep]: https://github.com/rust-lang/rust/pull/28339
9096 [es]: https://github.com/rust-lang/rust/pull/27956
9097 [ext]: https://github.com/rust-lang/rust/pull/28094
9098 [faststr]: https://github.com/rust-lang/rust/pull/28338
9099 [ffi]: https://github.com/rust-lang/rust/pull/28779
9100 [fp]: https://github.com/rust-lang/rust/pull/28268
9101 [fp2]: https://github.com/rust-lang/rust/pull/28560
9102 [fp3]: https://github.com/rust-lang/rust/pull/27307
9103 [i]: https://github.com/rust-lang/rust/pull/27451
9104 [into2]: https://github.com/rust-lang/rust/pull/28039
9105 [it]: https://github.com/rust-lang/rust/pull/27652
9106 [mm]: https://github.com/rust-lang/rust/pull/27338
9107 [mutw]: https://github.com/rust-lang/rust/pull/28368
9108 [sound]: https://github.com/rust-lang/rust/pull/27641
9109 [p]: https://github.com/rust-lang/rust/pull/27866
9110 [pec]: https://github.com/rust-lang/rust/pull/28486
9111 [pr]: https://github.com/rust-lang/rust/pull/27896
9112 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9113 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9114 [s]: https://github.com/rust-lang/rust/pull/27474
9115 [stab]: https://github.com/rust-lang/rust/pull/28339
9116 [stat]: https://github.com/rust-lang/rust/pull/28321
9117 [vd]: https://github.com/rust-lang/rust/pull/28494
9119 Version 1.3.0 (2015-09-17)
9120 ==============================
9122 * ~900 changes, numerous bugfixes
9127 * The [new object lifetime defaults][nold] have been [turned
9128 on][nold2] after a cycle of warnings about the change. Now types
9129 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9130 being interpreted as `&'a Box<Trait+'a>` to `&'a
9131 Box<Trait+'static>`.
9132 * [The Rustonomicon][nom] is a new book in the official documentation
9133 that dives into writing unsafe Rust.
9134 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9135 timekeeping is employed by other std APIs, as well as out-of-tree
9141 * The [new object lifetime defaults][nold] have been [turned
9142 on][nold2] after a cycle of warnings about the change.
9143 * There is a known [regression][lr] in how object lifetime elision is
9144 interpreted, the proper solution for which is undetermined.
9145 * The `#[prelude_import]` attribute, an internal implementation
9146 detail, was accidentally stabilized previously. [It has been put
9147 behind the `prelude_import` feature gate][pi]. This change is
9148 believed to break no existing code.
9149 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9150 [more sane for dynamically sized types][dst3]. Code that relied on
9151 the previous behavior is thought to be broken.
9152 * The `dropck` rules, which checks that destructors can't access
9153 destroyed values, [have been updated][dropck] to match the
9154 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9155 cause some previously-compiling code to no longer build.
9160 * The [new object lifetime defaults][nold] have been [turned
9161 on][nold2] after a cycle of warnings about the change.
9162 * Semicolons may [now follow types and paths in
9163 macros](https://github.com/rust-lang/rust/pull/27000).
9164 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9165 [more sane for dynamically sized types][dst3]. Code that relied on
9166 the previous behavior is not known to exist, and suspected to be
9168 * `'static` variables [may now be recursive][st].
9169 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9170 implementations correctly.
9171 * The `dropck` rules, which checks that destructors can't access
9172 destroyed values, [have been updated][dropck] to match the
9178 * The [`Duration`] API, [has been stabilized][ds], as well as the
9179 `std::time` module, which presently contains only `Duration`.
9180 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9181 * The owned C string, [`CString`], implements [`Borrow`] and the
9182 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9183 these allow C strings to be borrowed and cloned in generic code.
9184 * [`CStr`] implements [`Debug`].
9185 * [`AtomicPtr`] implements [`Debug`].
9186 * [`Error`] trait objects [can be downcast to their concrete types][e]
9187 in many common configurations, using the [`is`], [`downcast`],
9188 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9190 * Searching for substrings now [employs the two-way algorithm][search]
9191 instead of doing a naive search. This gives major speedups to a
9192 number of methods, including [`contains`][sc], [`find`][sf],
9193 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9194 [`ends_with`][sew] are also faster.
9195 * The performance of `PartialEq` for slices is [much faster][ps].
9196 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9197 is overridden and optimized by the implementations for scalars.
9198 * The [`Hasher`] trait now has a number of specialized `write_*`
9199 methods for primitive types, for efficiency.
9200 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9201 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9202 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9203 of [`std::error::Error::cause`][iec] also delegates to the inner
9205 * [`process::Child`][pc] gained the [`id`] method, which returns a
9206 `u32` representing the platform-specific process identifier.
9207 * The [`connect`] method on slices is deprecated, replaced by the new
9208 [`join`] method (note that both of these are on the *unstable*
9209 [`SliceConcatExt`] trait, but through the magic of the prelude are
9210 available to stable code anyway).
9211 * The [`Div`] operator is implemented for [`Wrapping`] types.
9212 * [`DerefMut` is implemented for `String`][dms].
9213 * Performance of SipHash (the default hasher for `HashMap`) is
9214 [better for long data][sh].
9215 * [`AtomicPtr`] implements [`Send`].
9216 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9217 are now [specialized to use uninitialized buffers for increased
9219 * Lifetime parameters of foreign functions [are now resolved
9225 * Rust can now, with some coercion, [produce programs that run on
9226 Windows XP][xp], though XP is not considered a supported platform.
9227 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9228 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9229 recommended for use in 1.3, though should be fully-functional
9230 in the [64-bit 1.4 beta][b14].
9231 * On Fedora-based systems installation will [properly configure the
9232 dynamic linker][fl].
9233 * The compiler gained many new extended error descriptions, which can
9234 be accessed with the `--explain` flag.
9235 * The `dropck` pass, which checks that destructors can't access
9236 destroyed values, [has been rewritten][27261]. This fixes some
9237 soundness holes, and as such will cause some previously-compiling
9238 code to no longer build.
9239 * `rustc` now uses [LLVM to write archive files where possible][ar].
9240 Eventually this will eliminate the compiler's dependency on the ar
9242 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9243 supported FreeBSD on x86_64).
9244 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9245 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9247 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9248 will kill the process instead of leaking][nlp].
9250 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9251 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9252 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9253 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9254 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9255 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9256 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9257 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9258 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9259 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9260 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9261 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9262 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9263 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9264 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9265 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9266 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9267 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9268 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9269 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9270 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9271 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9272 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9273 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9274 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9275 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9276 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9277 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9278 [ar]: https://github.com/rust-lang/rust/pull/26926
9279 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9280 [dms]: https://github.com/rust-lang/rust/pull/26241
9281 [27261]: https://github.com/rust-lang/rust/pull/27261
9282 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9283 [ds]: https://github.com/rust-lang/rust/pull/26818
9284 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9285 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9286 [dst3]: https://github.com/rust-lang/rust/pull/27351
9287 [e]: https://github.com/rust-lang/rust/pull/24793
9288 [f]: https://github.com/rust-lang/rust/pull/26588
9289 [26959]: https://github.com/rust-lang/rust/pull/26959
9290 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9291 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9292 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9293 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9294 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9295 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9296 [lic]: https://github.com/rust-lang/rust/pull/26583
9297 [lnu]: https://github.com/rust-lang/rust/pull/27026
9298 [lr]: https://github.com/rust-lang/rust/issues/27248
9299 [lum]: https://github.com/rust-lang/rust/pull/26378
9300 [lur]: https://github.com/rust-lang/rust/pull/26783
9301 [nlp]: https://github.com/rust-lang/rust/pull/27176
9302 [nold2]: https://github.com/rust-lang/rust/pull/27045
9303 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9304 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9305 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9306 [pi]: https://github.com/rust-lang/rust/pull/26699
9307 [ps]: https://github.com/rust-lang/rust/pull/26884
9308 [rte]: https://github.com/rust-lang/rust/pull/26950
9309 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9310 [search]: https://github.com/rust-lang/rust/pull/26327
9311 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9312 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9313 [sh]: https://github.com/rust-lang/rust/pull/27280
9314 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9315 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9316 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9317 [st]: https://github.com/rust-lang/rust/pull/26630
9318 [win1]: https://github.com/rust-lang/rust/pull/26569
9319 [win2]: https://github.com/rust-lang/rust/pull/26741
9320 [win3]: https://github.com/rust-lang/rust/pull/26741
9321 [win4]: https://github.com/rust-lang/rust/pull/27210
9322 [xp]: https://github.com/rust-lang/rust/pull/26569
9324 Version 1.2.0 (2015-08-07)
9325 ==========================
9327 * ~1200 changes, numerous bugfixes
9332 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9333 like `Rc` to contain types without a fixed size, arrays and trait
9334 objects, finally enabling use of `Rc<[T]>` and completing the
9335 implementation of DST.
9336 * [Parallel codegen][parcodegen] is now working again, which can
9337 substantially speed up large builds in debug mode; It also gets
9338 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9339 jobs). It's not enabled by default, but will be "in the near
9340 future". It can be activated with the `-C codegen-units=N` flag to
9342 * This is the first release with [experimental support for linking
9343 with the MSVC linker and lib C on Windows (instead of using the GNU
9344 variants via MinGW)][win]. It is yet recommended only for the most
9345 intrepid Rustaceans.
9346 * Benchmark compilations are showing a 30% improvement in
9347 bootstrapping over 1.1.
9352 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9353 unicode case mapping, which is a previously-planned change in
9354 behavior and considered a bugfix.
9355 * [`mem::align_of`] now specifies [the *minimum alignment* for
9356 T][align], which is usually the alignment programs are interested
9357 in, and the same value reported by clang's
9358 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9360 * [The `#[packed]` attribute is no longer silently accepted by the
9361 compiler][packed]. This attribute did nothing and code that
9362 mentioned it likely did not work as intended.
9363 * Associated type defaults are [now behind the
9364 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9365 defaults *did not work*, but could be mentioned syntactically. As
9366 such this breakage has minimal impact.
9371 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9372 matching against dereferenceable values.
9377 * The [`Extend`] trait, which grows a collection from an iterator, is
9378 implemented over iterators of references, for `String`, `Vec`,
9379 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9380 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9381 * The [`iter::once`] function returns an iterator that yields a single
9382 element, and [`iter::empty`] returns an iterator that yields no
9384 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9385 over substring matches.
9386 * [`Cell`] and [`RefCell`] both implement `Eq`.
9387 * A number of methods for wrapping arithmetic are added to the
9388 integral types, [`wrapping_div`], [`wrapping_rem`],
9389 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9390 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9391 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9392 type.. It is illegal for the default arithmetic operations in Rust
9393 to overflow; the desire to wrap must be explicit.
9394 * The `{:#?}` formatting specifier [displays the alternate,
9395 pretty-printed][debugfmt] form of the `Debug` formatter. This
9396 feature was actually introduced prior to 1.0 with little
9398 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9399 for writing data to formatted strings, similar to [`io::Write`].
9400 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9401 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9402 are used by code generators to emit implementations of [`Debug`].
9403 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9404 methods that convert case, following Unicode case mapping.
9405 * It is now easier to handle poisoned locks. The [`PoisonError`]
9406 type, returned by failing lock operations, exposes `into_inner`,
9407 `get_ref`, and `get_mut`, which all give access to the inner lock
9408 guard, and allow the poisoned lock to continue to operate. The
9409 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9410 poisoned lock without attempting to take the lock.
9411 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9412 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9413 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9414 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9416 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9422 * `rustc` employs smarter heuristics for guessing at [typos].
9423 * `rustc` emits more efficient code for [no-op conversions between
9424 unsafe pointers][nop].
9425 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9426 resulting in faster compile times and smaller code.
9428 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9429 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9430 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9431 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9432 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9433 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9434 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9435 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9436 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9437 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9438 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9439 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9440 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9441 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9442 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9443 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9444 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9445 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9446 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9447 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9448 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9449 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9450 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9451 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9452 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9453 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9454 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9455 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9456 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9457 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9458 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9459 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9460 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9461 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9462 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9463 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9464 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9465 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9466 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9467 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9468 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9469 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9470 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9471 [align]: https://github.com/rust-lang/rust/pull/25646
9472 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9473 [typos]: https://github.com/rust-lang/rust/pull/26087
9474 [nop]: https://github.com/rust-lang/rust/pull/26336
9475 [fat]: https://github.com/rust-lang/rust/pull/26411
9476 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9477 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9478 [packed]: https://github.com/rust-lang/rust/pull/25541
9479 [ad]: https://github.com/rust-lang/rust/pull/27382
9480 [win]: https://github.com/rust-lang/rust/pull/25350
9482 Version 1.1.0 (2015-06-25)
9483 =========================
9485 * ~850 changes, numerous bugfixes
9490 * The [`std::fs` module has been expanded][fs] to expand the set of
9491 functionality exposed:
9492 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9493 don't incur a syscall on some platforms.
9494 * A `symlink_metadata` function has been added.
9495 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9496 access to all underlying information.
9497 * The compiler now contains extended explanations of many errors. When an error
9498 with an explanation occurs the compiler suggests using the `--explain` flag
9499 to read the explanation. Error explanations are also [available online][err-index].
9500 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9501 well as other work, the time to bootstrap the compiler decreased by
9507 * The [`str::split_whitespace`] method splits a string on unicode
9508 whitespace boundaries.
9509 * On both Windows and Unix, new extension traits provide conversion of
9510 I/O types to and from the underlying system handles. On Unix, these
9511 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9512 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9513 `TcpListener`, and `UpdSocket`. Further implementations for
9514 `std::process` will be stabilized later.
9515 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9516 Windows, symlinks can be created with
9517 `std::os::windows::symlink_dir` and
9518 `std::os::windows::symlink_file`.
9519 * The `mpsc::Receiver` type can now be converted into an iterator with
9520 `into_iter` on the [`IntoIterator`] trait.
9521 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9522 implementation of the [`From`] trait.
9523 * The `Debug` implementation for `RangeFull` [creates output that is
9524 more consistent with other implementations][rf].
9525 * [`Debug` is implemented for `File`][file].
9526 * The `Default` implementation for `Arc` [no longer requires `Sync +
9528 * [The `Iterator` methods `count`, `nth`, and `last` have been
9529 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9530 * Incorrect handling of paths on Windows has been improved in both the
9531 compiler and the standard library.
9532 * [`AtomicPtr` gained a `Default` implementation][ap].
9533 * In accordance with Rust's policy on arithmetic overflow `abs` now
9534 [panics on overflow when debug assertions are enabled][abs].
9535 * The [`Cloned`] iterator, which was accidentally left unstable for
9536 1.0 [has been stabilized][c].
9537 * The [`Incoming`] iterator, which iterates over incoming TCP
9538 connections, and which was accidentally unnamable in 1.0, [is now
9539 properly exported][inc].
9540 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9541 `sift_up` or `sift_down` panic][bh].
9542 * The [`split_off`] method of `LinkedList` [no longer corrupts
9543 the list in certain scenarios][ll].
9548 * Type checking performance [has improved notably][sk] with
9549 [multiple improvements][pre].
9550 * The compiler [suggests code changes][ch] for more errors.
9551 * rustc and it's build system have experimental support for [building
9552 toolchains against MUSL][m] instead of glibc on Linux.
9553 * The compiler defines the `target_env` cfg value, which is used for
9554 distinguishing toolchains that are otherwise for the same
9555 platform. Presently this is set to `gnu` for common GNU Linux
9556 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9557 * The [`cargo rustc`][crc] command invokes a build with custom flags
9559 * [Android executables are always position independent][pie].
9560 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9561 with `Drop`][24935].
9563 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9564 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9565 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9566 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9567 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9568 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9569 [rf]: https://github.com/rust-lang/rust/pull/24491
9570 [err-index]: https://doc.rust-lang.org/error-index.html
9571 [sk]: https://github.com/rust-lang/rust/pull/24615
9572 [pre]: https://github.com/rust-lang/rust/pull/25323
9573 [file]: https://github.com/rust-lang/rust/pull/24598
9574 [ch]: https://github.com/rust-lang/rust/pull/24683
9575 [arc]: https://github.com/rust-lang/rust/pull/24695
9576 [si]: https://github.com/rust-lang/rust/pull/24701
9577 [ap]: https://github.com/rust-lang/rust/pull/24834
9578 [m]: https://github.com/rust-lang/rust/pull/24777
9579 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9580 [crc]: https://github.com/rust-lang/cargo/pull/1568
9581 [pie]: https://github.com/rust-lang/rust/pull/24953
9582 [abs]: https://github.com/rust-lang/rust/pull/25441
9583 [c]: https://github.com/rust-lang/rust/pull/25496
9584 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9585 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9586 [inc]: https://github.com/rust-lang/rust/pull/25522
9587 [bh]: https://github.com/rust-lang/rust/pull/25856
9588 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9589 [ll]: https://github.com/rust-lang/rust/pull/26022
9590 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9591 [24935]: https://github.com/rust-lang/rust/pull/24935
9593 Version 1.0.0 (2015-05-15)
9594 ========================
9596 * ~1500 changes, numerous bugfixes
9601 * The vast majority of the standard library is now `#[stable]`. It is
9602 no longer possible to use unstable features with a stable build of
9604 * Many popular crates on [crates.io] now work on the stable release
9606 * Arithmetic on basic integer types now [checks for overflow in debug
9612 * Several [restrictions have been added to trait coherence][coh] in
9613 order to make it easier for upstream authors to change traits
9614 without breaking downstream code.
9615 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9616 improve error messages and macro behavior. For example, `0b1234` is
9617 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9618 * Trait bounds [are always invariant][inv], eliminating the need for
9619 the `PhantomFn` and `MarkerTrait` lang items, which have been
9621 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9622 "foo" as bar` syntax has been replaced with `extern crate foo as
9623 bar`, and Cargo now automatically translates "-" in *package* names
9624 to underscore for the crate name.
9625 * [Lifetime shadowing is an error][lt].
9626 * [`Send` no longer implies `'static`][send-rfc].
9627 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9628 `MyType::default()`.
9629 * Primitive types [now have inherent methods][prim-inherent],
9630 obviating the need for extension traits like `SliceExt`.
9631 * Methods with `Self: Sized` in their `where` clause are [considered
9632 object-safe][self-sized], allowing many extension traits like
9633 `IteratorExt` to be merged into the traits they extended.
9634 * You can now [refer to associated types][assoc-where] whose
9635 corresponding trait bounds appear only in a `where` clause.
9636 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9637 like `Send` and `Sync` are now library-defined.
9638 * A [Reflect trait][reflect] was introduced, which means that
9639 downcasting via the `Any` trait is effectively limited to concrete
9640 types. This helps retain the potentially-important "parametricity"
9641 property: generic code cannot behave differently for different type
9642 arguments except in minor ways.
9643 * The `unsafe_destructor` feature is now deprecated in favor of the
9644 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9650 * The `thread_local` module [has been renamed to `std::thread`][th].
9651 * The methods of `IteratorExt` [have been moved to the `Iterator`
9652 trait itself][23300].
9653 * Several traits that implement Rust's conventions for type
9654 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9655 [centralized in the `std::convert` module][con].
9656 * The `FromError` trait [was removed in favor of `From`][fe].
9657 * The basic sleep function [has moved to
9658 `std::thread::sleep_ms`][slp].
9659 * The `splitn` function now takes an `n` parameter that represents the
9660 number of items yielded by the returned iterator [instead of the
9661 number of 'splits'][spl].
9662 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9663 * [Derived implementations of `PartialOrd` now order enums according
9664 to their explicitly-assigned discriminants][po].
9665 * [Methods for searching strings are generic over `Pattern`s][pat],
9666 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9668 * [In method resolution, object methods are resolved before inherent
9670 * [`String::from_str` has been deprecated in favor of the `From` impl,
9671 `String::from`][24517].
9672 * [`io::Error` implements `Sync`][ios].
9673 * [The `words` method on `&str` has been replaced with
9674 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9676 * The new path and IO modules are complete and `#[stable]`. This
9677 was the major library focus for this cycle.
9678 * The path API was [revised][path-normalize] to normalize `.`,
9679 adjusting the tradeoffs in favor of the most common usage.
9680 * A large number of remaining APIs in `std` were also stabilized
9681 during this cycle; about 75% of the non-deprecated API surface
9683 * The new [string pattern API][string-pattern] landed, which makes
9684 the string slice API much more internally consistent and flexible.
9685 * A new set of [generic conversion traits][conversion] replaced
9686 many existing ad hoc traits.
9687 * Generic numeric traits were [completely removed][num-traits]. This
9688 was made possible thanks to inherent methods for primitive types,
9689 and the removal gives maximal flexibility for designing a numeric
9690 hierarchy in the future.
9691 * The `Fn` traits are now related via [inheritance][fn-inherit]
9692 and provide ergonomic [blanket implementations][fn-blanket].
9693 * The `Index` and `IndexMut` traits were changed to
9694 [take the index by value][index-value], enabling code like
9695 `hash_map["string"]` to work.
9696 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9697 `Copy` data is known to be `Clone` as well.
9702 * Many errors now have extended explanations that can be accessed with
9703 the `--explain` flag to `rustc`.
9704 * Many new examples have been added to the standard library
9706 * rustdoc has received a number of improvements focused on completion
9708 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9709 * Much headway was made on ecosystem-wide CI, making it possible
9710 to [compare builds for breakage][ci-compare].
9713 [crates.io]: http://crates.io
9714 [clo]: https://github.com/rust-lang/rust/pull/24034
9715 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9716 [con]: https://github.com/rust-lang/rust/pull/23875
9717 [cr]: https://github.com/rust-lang/rust/pull/23419
9718 [fe]: https://github.com/rust-lang/rust/pull/23879
9719 [23300]: https://github.com/rust-lang/rust/pull/23300
9720 [inv]: https://github.com/rust-lang/rust/pull/23938
9721 [ios]: https://github.com/rust-lang/rust/pull/24133
9722 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9723 [lt]: https://github.com/rust-lang/rust/pull/24057
9724 [meth]: https://github.com/rust-lang/rust/pull/24056
9725 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9726 [po]: https://github.com/rust-lang/rust/pull/24270
9727 [24517]: https://github.com/rust-lang/rust/pull/24517
9728 [slp]: https://github.com/rust-lang/rust/pull/23949
9729 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9730 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9731 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9732 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9733 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9734 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9735 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9736 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9737 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9738 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9739 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9740 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9741 [reflect]: https://github.com/rust-lang/rust/pull/23712
9742 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9743 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9744 [index-value]: https://github.com/rust-lang/rust/pull/23601
9745 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9746 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9747 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9748 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9749 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9750 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9753 Version 1.0.0-alpha.2 (2015-02-20)
9754 =====================================
9756 * ~1300 changes, numerous bugfixes
9760 * The various I/O modules were [overhauled][io-rfc] to reduce
9761 unnecessary abstractions and provide better interoperation with
9762 the underlying platform. The old `io` module remains temporarily
9764 * The standard library now [participates in feature gating][feat],
9765 so use of unstable libraries now requires a `#![feature(...)]`
9766 attribute. The impact of this change is [described on the
9767 forum][feat-forum]. [RFC][feat-rfc].
9771 * `for` loops [now operate on the `IntoIterator` trait][into],
9772 which eliminates the need to call `.iter()`, etc. to iterate
9773 over collections. There are some new subtleties to remember
9774 though regarding what sort of iterators various types yield, in
9775 particular that `for foo in bar { }` yields values from a move
9776 iterator, destroying the original collection. [RFC][into-rfc].
9777 * Objects now have [default lifetime bounds][obj], so you don't
9778 have to write `Box<Trait+'static>` when you don't care about
9779 storing references. [RFC][obj-rfc].
9780 * In types that implement `Drop`, [lifetimes must outlive the
9781 value][drop]. This will soon make it possible to safely
9782 implement `Drop` for types where `#[unsafe_destructor]` is now
9783 required. Read the [gorgeous RFC][drop-rfc] for details.
9784 * The fully qualified <T as Trait>::X syntax lets you set the Self
9785 type for a trait method or associated type. [RFC][ufcs-rfc].
9786 * References to types that implement `Deref<U>` now [automatically
9787 coerce to references][deref] to the dereferenced type `U`,
9788 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9789 should eliminate many unsightly uses of `&*`, as when converting
9790 from references to vectors into references to
9791 slices. [RFC][deref-rfc].
9792 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9793 `|:|`) is obsolete and closure kind is inferred from context.
9794 * [`Self` is a keyword][Self].
9798 * The `Show` and `String` formatting traits [have been
9799 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9800 their related purposes. Automatically getting a string
9801 conversion to use with `format!("{:?}", something_to_debug)` is
9802 now written `#[derive(Debug)]`.
9803 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9804 OsStr}`, provide strings in platform-specific encodings for easier
9805 interop with system APIs. [RFC][osstr-rfc].
9806 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9807 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9808 creating raw pointers.
9812 * Certain long error messages of the form 'expected foo found bar'
9813 are now [split neatly across multiple
9814 lines][multiline]. Examples in the PR.
9815 * On Unix Rust can be [uninstalled][un] by running
9816 `/usr/local/lib/rustlib/uninstall.sh`.
9817 * The `#[rustc_on_unimplemented]` attribute, requiring the
9818 'on_unimplemented' feature, lets rustc [display custom error
9819 messages when a trait is expected to be implemented for a type
9824 * Rust is tested against a [LALR grammar][lalr], which parses
9825 almost all the Rust files that rustc does.
9827 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9828 [close]: https://github.com/rust-lang/rust/pull/21843
9829 [deref]: https://github.com/rust-lang/rust/pull/21351
9830 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9831 [drop]: https://github.com/rust-lang/rust/pull/21972
9832 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9833 [feat]: https://github.com/rust-lang/rust/pull/21248
9834 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9835 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9836 [fmt]: https://github.com/rust-lang/rust/pull/21457
9837 [into]: https://github.com/rust-lang/rust/pull/20790
9838 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9839 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9840 [lalr]: https://github.com/rust-lang/rust/pull/21452
9841 [multiline]: https://github.com/rust-lang/rust/pull/19870
9842 [obj]: https://github.com/rust-lang/rust/pull/22230
9843 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9844 [onun]: https://github.com/rust-lang/rust/pull/20889
9845 [osstr]: https://github.com/rust-lang/rust/pull/21488
9846 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9847 [Self]: https://github.com/rust-lang/rust/pull/22158
9848 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9849 [un]: https://github.com/rust-lang/rust/pull/22256
9852 Version 1.0.0-alpha (2015-01-09)
9853 ==================================
9855 * ~2400 changes, numerous bugfixes
9859 * The language itself is considered feature complete for 1.0,
9860 though there will be many usability improvements and bugfixes
9861 before the final release.
9862 * Nearly 50% of the public API surface of the standard library has
9863 been declared 'stable'. Those interfaces are unlikely to change
9865 * The long-running debate over integer types has been
9866 [settled][ints]: Rust will ship with types named `isize` and
9867 `usize`, rather than `int` and `uint`, for pointer-sized
9868 integers. Guidelines will be rolled out during the alpha cycle.
9869 * Most crates that are not `std` have been moved out of the Rust
9870 distribution into the Cargo ecosystem so they can evolve
9871 separately and don't need to be stabilized as quickly, including
9872 'time', 'getopts', 'num', 'regex', and 'term'.
9873 * Documentation continues to be expanded with more API coverage, more
9874 examples, and more in-depth explanations. The guides have been
9875 consolidated into [The Rust Programming Language][trpl].
9876 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9877 * All official Rust binary installers now come with [Cargo], the
9878 Rust package manager.
9882 * Closures have been [completely redesigned][unboxed] to be
9883 implemented in terms of traits, can now be used as generic type
9884 bounds and thus monomorphized and inlined, or via an opaque
9885 pointer (boxed) as in the old system. The new system is often
9886 referred to as 'unboxed' closures.
9887 * Traits now support [associated types][assoc], allowing families
9888 of related types to be defined together and used generically in
9890 * Enum variants are [namespaced by their type names][enum].
9891 * [`where` clauses][where] provide a more versatile and attractive
9892 syntax for specifying generic bounds, though the previous syntax
9894 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9896 * Rust [no longer has a runtime][rt] of any description, and only
9897 supports OS threads, not green threads.
9898 * At long last, Rust has been overhauled for 'dynamically-sized
9899 types' ([DST]), which integrates 'fat pointers' (object types,
9900 arrays, and `str`) more deeply into the type system, making it
9902 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9903 `..j` that produce range types and which, when combined with the
9904 `Index` operator and multidispatch, leads to a convenient slice
9906 * The new range syntax revealed an ambiguity in the fixed-length
9907 array syntax, so now fixed length arrays [are written `[T;
9909 * The `Copy` trait is no longer implemented automatically. Unsafe
9910 pointers no longer implement `Sync` and `Send` so types
9911 containing them don't automatically either. `Sync` and `Send`
9912 are now 'unsafe traits' so one can "forcibly" implement them via
9913 `unsafe impl` if a type confirms to the requirements for them
9914 even though the internals do not (e.g. structs containing unsafe
9915 pointers like `Arc`). These changes are intended to prevent some
9916 footguns and are collectively known as [opt-in built-in
9917 traits][oibit] (though `Sync` and `Send` will soon become pure
9918 library types unknown to the compiler).
9919 * Operator traits now take their operands [by value][ops], and
9920 comparison traits can use multidispatch to compare one type
9921 against multiple other types, allowing e.g. `String` to be
9922 compared with `&str`.
9923 * `if let` and `while let` are no longer feature-gated.
9924 * Rust has adopted a more [uniform syntax for escaping unicode
9925 characters][unicode].
9926 * `macro_rules!` [has been declared stable][mac]. Though it is a
9927 flawed system it is sufficiently popular that it must be usable
9928 for 1.0. Effort has gone into [future-proofing][mac-future] it
9929 in ways that will allow other macro systems to be developed in
9930 parallel, and won't otherwise impact the evolution of the
9932 * The prelude has been [pared back significantly][prelude] such
9933 that it is the minimum necessary to support the most pervasive
9934 code patterns, and through [generalized where clauses][where]
9935 many of the prelude extension traits have been consolidated.
9936 * Rust's rudimentary reflection [has been removed][refl], as it
9937 incurred too much code generation for little benefit.
9938 * [Struct variants][structvars] are no longer feature-gated.
9939 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9940 known as 'higher-ranked trait bounds', this crucially allows
9941 unboxed closures to work.
9942 * Macros invocations surrounded by parens or square brackets and
9943 not terminated by a semicolon are [parsed as
9944 expressions][macros], which makes expressions like `vec![1i32,
9945 2, 3].len()` work as expected.
9946 * Trait objects now implement their traits automatically, and
9947 traits that can be coerced to objects now must be [object
9949 * Automatically deriving traits is now done with `#[derive(...)]`
9950 not `#[deriving(...)]` for [consistency with other naming
9951 conventions][derive].
9952 * Importing the containing module or enum at the same time as
9953 items or variants they contain is [now done with `self` instead
9954 of `mod`][self], as in use `foo::{self, bar}`
9955 * Glob imports are no longer feature-gated.
9956 * The `box` operator and `box` patterns have been feature-gated
9957 pending a redesign. For now unique boxes should be allocated
9958 like other containers, with `Box::new`.
9962 * A [series][coll1] of [efforts][coll2] to establish
9963 [conventions][coll3] for collections types has resulted in API
9964 improvements throughout the standard library.
9965 * New [APIs for error handling][err] provide ergonomic interop
9966 between error types, and [new conventions][err-conv] describe
9967 more clearly the recommended error handling strategies in Rust.
9968 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9969 it is easier to discuss failure in the context of error handling
9970 without making clarifications as to whether you are referring to
9971 the 'fail' macro or failure more generally.
9972 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9973 syscall when available.
9974 * The 'serialize' crate has been renamed 'rustc-serialize' and
9975 moved out of the distribution to Cargo. Although it is widely
9976 used now, it is expected to be superseded in the near future.
9977 * The `Show` formatter, typically implemented with
9978 `#[derive(Show)]` is [now requested with the `{:?}`
9979 specifier][show] and is intended for use by all types, for uses
9980 such as `println!` debugging. The new `String` formatter must be
9981 implemented by hand, uses the `{}` specifier, and is intended
9982 for full-fidelity conversions of things that can logically be
9983 represented as strings.
9987 * [Flexible target specification][flex] allows rustc's code
9988 generation to be configured to support otherwise-unsupported
9990 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9991 respective debuggers with Rust-appropriate pretty-printing.
9992 * The Windows installation of Rust is distributed with the
9993 MinGW components currently required to link binaries on that
9998 * Nullable enum optimizations have been extended to more types so
9999 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10000 space than the inner types themselves.
10001 * Work has begun on supporting AArch64.
10003 [Cargo]: https://crates.io
10004 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10005 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10006 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10007 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10008 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10009 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10010 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10011 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10012 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10013 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10014 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10015 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10016 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10017 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10018 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10019 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10020 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10021 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10022 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10023 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10024 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10025 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10026 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10027 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10028 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10029 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10030 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10031 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10032 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10033 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10034 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10035 [trpl]: https://doc.rust-lang.org/book/index.html
10036 [rbe]: http://rustbyexample.com/
10039 Version 0.12.0 (2014-10-09)
10040 =============================
10042 * ~1900 changes, numerous bugfixes
10046 * The introductory documentation (now called The Rust Guide) has
10047 been completely rewritten, as have a number of supplementary
10049 * Rust's package manager, Cargo, continues to improve and is
10050 sometimes considered to be quite awesome.
10051 * Many API's in `std` have been reviewed and updated for
10052 consistency with the in-development Rust coding
10053 guidelines. The standard library documentation tracks
10054 stabilization progress.
10055 * Minor libraries have been moved out-of-tree to the rust-lang org
10056 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10057 be installed with Cargo.
10058 * Lifetime elision allows lifetime annotations to be left off of
10059 function declarations in many common scenarios.
10060 * Rust now works on 64-bit Windows.
10063 * Indexing can be overloaded with the `Index` and `IndexMut`
10065 * The `if let` construct takes a branch only if the `let` pattern
10066 matches, currently behind the 'if_let' feature gate.
10067 * 'where clauses', a more flexible syntax for specifying trait
10068 bounds that is more aesthetic, have been added for traits and
10069 free functions. Where clauses will in the future make it
10070 possible to constrain associated types, which would be
10071 impossible with the existing syntax.
10072 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10073 the 'slicing_syntax' feature gate, and can be overloaded with
10074 the `Slice` or `SliceMut` traits.
10075 * The syntax for matching of sub-slices has been changed to use a
10076 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10077 consistency with other uses of `..` and to future-proof
10078 potential additional uses of the syntax.
10079 * The syntax for matching inclusive ranges in patterns has changed
10080 from `0..3` to `0...4` to be consistent with the exclusive range
10081 syntax for slicing.
10082 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10083 c]`) has been put behind the 'advanced_slice_patterns' feature
10084 gate and may be removed in the future.
10085 * Components of tuples and tuple structs can be extracted using
10086 the `value.0` syntax, currently behind the `tuple_indexing`
10088 * The `#[crate_id]` attribute is no longer supported; versioning
10089 is handled by the package manager.
10090 * Renaming crate imports are now written `extern crate foo as bar`
10091 instead of `extern crate bar = foo`.
10092 * Renaming use statements are now written `use foo as bar` instead
10093 of `use bar = foo`.
10094 * `let` and `match` bindings and argument names in macros are now
10096 * The new, more efficient, closure types ('unboxed closures') have
10097 been added under a feature gate, 'unboxed_closures'. These will
10098 soon replace the existing closure types, once higher-ranked
10099 trait lifetimes are added to the language.
10100 * `move` has been added as a keyword, for indicating closures
10101 that capture by value.
10102 * Mutation and assignment is no longer allowed in pattern guards.
10103 * Generic structs and enums can now have trait bounds.
10104 * The `Share` trait is now called `Sync` to free up the term
10105 'shared' to refer to 'shared reference' (the default reference
10107 * Dynamically-sized types have been mostly implemented,
10108 unifying the behavior of fat-pointer types with the rest of the
10110 * As part of dynamically-sized types, the `Sized` trait has been
10111 introduced, which qualifying types implement by default, and
10112 which type parameters expect by default. To specify that a type
10113 parameter does not need to be sized, write `<Sized? T>`. Most
10114 types are `Sized`, notable exceptions being unsized arrays
10115 (`[T]`) and trait types.
10116 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10117 * Lifetime bounds can now be applied to type parameters and object
10119 * The old, reference counted GC type, `Gc<T>` which was once
10120 denoted by the `@` sigil, has finally been removed. GC will be
10121 revisited in the future.
10124 * Library documentation has been improved for a number of modules.
10125 * Bit-vectors, collections::bitv has been modernized.
10126 * The url crate is deprecated in favor of
10127 http://github.com/servo/rust-url, which can be installed with
10129 * Most I/O stream types can be cloned and subsequently closed from
10130 a different thread.
10131 * A `std::time::Duration` type has been added for use in I/O
10132 methods that rely on timers, as well as in the 'time' crate's
10133 `Timespec` arithmetic.
10134 * The runtime I/O abstraction layer that enabled the green thread
10135 scheduler to do non-thread-blocking I/O has been removed, along
10136 with the libuv-based implementation employed by the green thread
10137 scheduler. This will greatly simplify the future I/O work.
10138 * `collections::btree` has been rewritten to have a more
10139 idiomatic and efficient design.
10142 * rustdoc output now indicates the stability levels of API's.
10143 * The `--crate-name` flag can specify the name of the crate
10144 being compiled, like `#[crate_name]`.
10145 * The `-C metadata` specifies additional metadata to hash into
10146 symbol names, and `-C extra-filename` specifies additional
10147 information to put into the output filename, for use by the
10148 package manager for versioning.
10149 * debug info generation has continued to improve and should be
10150 more reliable under both gdb and lldb.
10151 * rustc has experimental support for compiling in parallel
10152 using the `-C codegen-units` flag.
10153 * rustc no longer encodes rpath information into binaries by
10157 * Stack usage has been optimized with LLVM lifetime annotations.
10158 * Official Rust binaries on Linux are more compatible with older
10159 kernels and distributions, built on CentOS 5.10.
10162 Version 0.11.0 (2014-07-02)
10163 ==========================
10165 * ~1700 changes, numerous bugfixes
10168 * ~[T] has been removed from the language. This type is superseded by
10170 * ~str has been removed from the language. This type is superseded by
10172 * ~T has been removed from the language. This type is superseded by the
10174 * @T has been removed from the language. This type is superseded by the
10175 standard library's std::gc::Gc<T> type.
10176 * Struct fields are now all private by default.
10177 * Vector indices and shift amounts are both required to be a `uint`
10178 instead of any integral type.
10179 * Byte character, byte string, and raw byte string literals are now all
10180 supported by prefixing the normal literal with a `b`.
10181 * Multiple ABIs are no longer allowed in an ABI string
10182 * The syntax for lifetimes on closures/procedures has been tweaked
10183 slightly: `<'a>|A, B|: 'b + K -> T`
10184 * Floating point modulus has been removed from the language; however it
10185 is still provided by a library implementation.
10186 * Private enum variants are now disallowed.
10187 * The `priv` keyword has been removed from the language.
10188 * A closure can no longer be invoked through a &-pointer.
10189 * The `use foo, bar, baz;` syntax has been removed from the language.
10190 * The transmute intrinsic no longer works on type parameters.
10191 * Statics now allow blocks/items in their definition.
10192 * Trait bounds are separated from objects with + instead of : now.
10193 * Objects can no longer be read while they are mutably borrowed.
10194 * The address of a static is now marked as insignificant unless the
10195 #[inline(never)] attribute is placed it.
10196 * The #[unsafe_destructor] attribute is now behind a feature gate.
10197 * Struct literals are no longer allowed in ambiguous positions such as
10198 if, while, match, and for..in.
10199 * Declaration of lang items and intrinsics are now feature-gated by
10201 * Integral literals no longer default to `int`, and floating point
10202 literals no longer default to `f64`. Literals must be suffixed with an
10203 appropriate type if inference cannot determine the type of the
10205 * The Box<T> type is no longer implicitly borrowed to &mut T.
10206 * Procedures are now required to not capture borrowed references.
10209 * The standard library is now a "facade" over a number of underlying
10210 libraries. This means that development on the standard library should
10211 be speedier due to smaller crates, as well as a clearer line between
10213 * A new library, libcore, lives under the standard library's facade
10214 which is Rust's "0-assumption" library, suitable for embedded and
10215 kernel development for example.
10216 * A regex crate has been added to the standard distribution. This crate
10217 includes statically compiled regular expressions.
10218 * The unwrap/unwrap_err methods on Result require a Show bound for
10219 better error messages.
10220 * The return types of the std::comm primitives have been centralized
10221 around the Result type.
10222 * A number of I/O primitives have gained the ability to time out their
10224 * A number of I/O primitives have gained the ability to close their
10225 reading/writing halves to cancel pending operations.
10226 * Reverse iterator methods have been removed in favor of `rev()` on
10227 their forward-iteration counterparts.
10228 * A bitflags! macro has been added to enable easy interop with C and
10229 management of bit flags.
10230 * A debug_assert! macro is now provided which is disabled when
10231 `--cfg ndebug` is passed to the compiler.
10232 * A graphviz crate has been added for creating .dot files.
10233 * The std::cast module has been migrated into std::mem.
10234 * The std::local_data api has been migrated from freestanding functions
10235 to being based on methods.
10236 * The Pod trait has been renamed to Copy.
10237 * jemalloc has been added as the default allocator for types.
10238 * The API for allocating memory has been changed to use proper alignment
10239 and sized deallocation
10240 * Connecting a TcpStream or binding a TcpListener is now based on a
10241 string address and a u16 port. This allows connecting to a hostname as
10243 * The Reader trait now contains a core method, read_at_least(), which
10244 correctly handles many repeated 0-length reads.
10245 * The process-spawning API is now centered around a builder-style
10247 * The :? printing qualifier has been moved from the standard library to
10248 an external libdebug crate.
10249 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10250 have been renamed to Eq/Ord.
10251 * The select/plural methods have been removed from format!. The escapes
10252 for { and } have also changed from \{ and \} to {{ and }},
10254 * The TaskBuilder API has been re-worked to be a true builder, and
10255 extension traits for spawning native/green tasks have been added.
10258 * All breaking changes to the language or libraries now have their
10259 commit message annotated with `[breaking-change]` to allow for easy
10260 discovery of breaking changes.
10261 * The compiler will now try to suggest how to annotate lifetimes if a
10262 lifetime-related error occurs.
10263 * Debug info continues to be improved greatly with general bug fixes and
10264 better support for situations like link time optimization (LTO).
10265 * Usage of syntax extensions when cross-compiling has been fixed.
10266 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10267 -fdata-sections and --gc-sections has been enabled by default
10268 * The compiler is now stricter about where it will load module files
10269 from when a module is declared via `mod foo;`.
10270 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10271 Syntax extensions are now discovered via a "plugin registrar" type
10272 which will be extended in the future to other various plugins.
10273 * Lints have been restructured to allow for dynamically loadable lints.
10274 * A number of rustdoc improvements:
10275 * The HTML output has been visually redesigned.
10276 * Markdown is now powered by hoedown instead of sundown.
10277 * Searching heuristics have been greatly improved.
10278 * The search index has been reduced in size by a great amount.
10279 * Cross-crate documentation via `pub use` has been greatly improved.
10280 * Primitive types are now hyperlinked and documented.
10281 * Documentation has been moved from static.rust-lang.org/doc to
10283 * A new sandbox, play.rust-lang.org, is available for running and
10284 sharing rust code examples on-line.
10285 * Unused attributes are now more robustly warned about.
10286 * The dead_code lint now warns about unused struct fields.
10287 * Cross-compiling to iOS is now supported.
10288 * Cross-compiling to mipsel is now supported.
10289 * Stability attributes are now inherited by default and no longer apply
10290 to intra-crate usage, only inter-crate usage.
10291 * Error message related to non-exhaustive match expressions have been
10295 Version 0.10 (2014-04-03)
10296 =========================
10298 * ~1500 changes, numerous bugfixes
10301 * A new RFC process is now in place for modifying the language.
10302 * Patterns with `@`-pointers have been removed from the language.
10303 * Patterns with unique vectors (`~[T]`) have been removed from the
10305 * Patterns with unique strings (`~str`) have been removed from the
10307 * `@str` has been removed from the language.
10308 * `@[T]` has been removed from the language.
10309 * `@self` has been removed from the language.
10310 * `@Trait` has been removed from the language.
10311 * Headers on `~` allocations which contain `@` boxes inside the type for
10312 reference counting have been removed.
10313 * The semantics around the lifetimes of temporary expressions have changed,
10314 see #3511 and #11585 for more information.
10315 * Cross-crate syntax extensions are now possible, but feature gated. See
10316 #11151 for more information. This includes both `macro_rules!` macros as
10317 well as syntax extensions such as `format!`.
10318 * New lint modes have been added, and older ones have been turned on to be
10320 * Unnecessary parentheses
10321 * Uppercase statics
10323 * Uppercase variables
10324 * Publicly visible private types
10325 * `#[deriving]` with raw pointers
10326 * Unsafe functions can no longer be coerced to closures.
10327 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10328 * The `#[simd]` attribute is now behind a feature gate.
10329 * Visibility is no longer allowed on `extern crate` statements, and
10330 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10331 * Trailing commas are now allowed in argument lists and tuple patterns.
10332 * The `do` keyword has been removed, it is now a reserved keyword.
10333 * Default type parameters have been implemented, but are feature gated.
10334 * Borrowed variables through captures in closures are now considered soundly.
10335 * `extern mod` is now `extern crate`
10336 * The `Freeze` trait has been removed.
10337 * The `Share` trait has been added for types that can be shared among
10339 * Labels in macros are now hygienic.
10340 * Expression/statement macro invocations can be delimited with `{}` now.
10341 * Treatment of types allowed in `static mut` locations has been tweaked.
10342 * The `*` and `.` operators are now overloadable through the `Deref` and
10344 * `~Trait` and `proc` no longer have `Send` bounds by default.
10345 * Partial type hints are now supported with the `_` type marker.
10346 * An `Unsafe` type was introduced for interior mutability. It is now
10347 considered undefined to transmute from `&T` to `&mut T` without using the
10349 * The #[linkage] attribute was implemented for extern statics/functions.
10350 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10351 * `Pod` was renamed to `Copy`.
10354 * The `libextra` library has been removed. It has now been decomposed into
10355 component libraries with smaller and more focused nuggets of
10356 functionality. The full list of libraries can be found on the
10357 documentation index page.
10358 * std: `std::condition` has been removed. All I/O errors are now propagated
10359 through the `Result` type. In order to assist with error handling, a
10360 `try!` macro for unwrapping errors with an early return and a lint for
10361 unused results has been added. See #12039 for more information.
10362 * std: The `vec` module has been renamed to `slice`.
10363 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10364 This will become the only growable vector in the future.
10365 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10366 are now found at `std::io::BufferedReader` instead of
10367 `std::io::buffered::BufferedReader`.
10368 * std: `print` and `println` are no longer in the prelude, the `print!` and
10369 `println!` macros are intended to be used instead.
10370 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10371 attempts to statically prevent cycles.
10372 * std: The standard distribution is adopting the policy of pushing failure
10373 to the user rather than failing in libraries. Many functions (such as
10374 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10375 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10376 deriving mode: `#[deriving(Show)]`.
10377 * std: `ToStr` is now implemented for all types implementing `Show`.
10378 * std: The formatting trait methods now take `&self` instead of `&T`
10379 * std: The `invert()` method on iterators has been renamed to `rev()`
10380 * std: `std::num` has seen a reduction in the genericity of its traits,
10381 consolidating functionality into a few core traits.
10382 * std: Backtraces are now printed on task failure if the environment
10383 variable `RUST_BACKTRACE` is present.
10384 * std: Naming conventions for iterators have been standardized. More details
10385 can be found on the wiki's style guide.
10386 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10387 still implement the function.
10388 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10389 * std: `assert_approx_eq!` has been removed
10390 * std: The `e` and `E` formatting specifiers for floats have been added to
10391 print them in exponential notation.
10392 * std: The `Times` trait has been removed
10393 * std: Indications of variance and opting out of builtin bounds is done
10394 through marker types in `std::kinds::marker` now
10395 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10396 `#[deriving(Hash)]` is now possible.
10397 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10398 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10399 * std: `Chan::new` is now `channel()`.
10400 * std: A new synchronous channel type has been implemented.
10401 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10402 * std: `hashmap` and `trie` have been moved to `libcollections`
10403 * std: `run` has been rolled into `io::process`
10404 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10405 * std: The equality and comparison traits have seen some reorganization.
10406 * std: `rand` has moved to `librand`.
10407 * std: `to_{lower,upper}case` has been implemented for `char`.
10408 * std: Logging has been moved to `liblog`.
10409 * collections: `HashMap` has been rewritten for higher performance and less
10411 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10412 it can be booted manually. The runtime guide has more information and
10414 * native: All I/O functionality except signals has been implemented.
10415 * green: Task spawning with `libgreen` has been optimized with stack caching
10416 and various trimming of code.
10417 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10418 * sync: The `extra::sync` module has been updated to modern rust (and moved
10419 to the `sync` library), tweaking and improving various interfaces while
10420 dropping redundant functionality.
10421 * sync: A new `Barrier` type has been added to the `sync` library.
10422 * sync: An efficient mutex for native and green tasks has been implemented.
10423 * serialize: The `base64` module has seen some improvement. It treats
10424 newlines better, has non-string error values, and has seen general
10426 * fourcc: A `fourcc!` macro was introduced
10427 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10428 hexadecimal literal.
10431 * `rustpkg` has been deprecated and removed from the main repository. Its
10432 replacement, `cargo`, is under development.
10433 * Nightly builds of rust are now available
10434 * The memory usage of rustc has been improved many times throughout this
10436 * The build process supports disabling rpath support for the rustc binary
10438 * Code generation has improved in some cases, giving more information to the
10439 LLVM optimization passes to enable more extensive optimizations.
10440 * Debuginfo compatibility with lldb on OSX has been restored.
10441 * The master branch is now gated on an android bot, making building for
10442 android much more reliable.
10443 * Output flags have been centralized into one `--emit` flag.
10444 * Crate type flags have been centralized into one `--crate-type` flag.
10445 * Codegen flags have been consolidated behind a `-C` flag.
10446 * Linking against outdated crates now has improved error messages.
10447 * Error messages with lifetimes will often suggest how to annotate the
10448 function to fix the error.
10449 * Many more types are documented in the standard library, and new guides
10451 * Many `rustdoc` improvements:
10452 * code blocks are syntax highlighted.
10453 * render standalone markdown files.
10454 * the --test flag tests all code blocks by default.
10455 * exported macros are displayed.
10456 * re-exported types have their documentation inlined at the location of the
10458 * search works across crates that have been rendered to the same output
10462 Version 0.9 (2014-01-09)
10463 ==========================
10465 * ~1800 changes, numerous bugfixes
10468 * The `float` type has been removed. Use `f32` or `f64` instead.
10469 * A new facility for enabling experimental features (feature gating) has
10470 been added, using the crate-level `#[feature(foo)]` attribute.
10471 * Managed boxes (@) are now behind a feature gate
10472 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10473 standard library's `Gc` or `Rc` types instead.
10474 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10475 * Jumping back to the top of a loop is now done with `continue` instead of
10477 * Strings can no longer be mutated through index assignment.
10478 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10479 hash delimiters, as in `r###"foo"###`.
10480 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10482 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10483 * `@fn`s have been removed.
10484 * `do` only works with procs in order to make it obvious what the cost
10486 * Single-element tuple-like structs can no longer be dereferenced to
10487 obtain the inner value. A more comprehensive solution for overloading
10488 the dereference operator will be provided in the future.
10489 * The `#[link(...)]` attribute has been replaced with
10490 `#[crate_id = "name#vers"]`.
10491 * Empty `impl`s must be terminated with empty braces and may not be
10492 terminated with a semicolon.
10493 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10494 no longer has any special meaning.
10495 * The old `fmt!` string formatting macro has been removed.
10496 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10497 `print!` and `println!`.
10498 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10499 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10500 `extern mod foo = "bar"` instead.
10501 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10502 * Macros can have attributes.
10503 * Macros can expand to items with attributes.
10504 * Macros can expand to multiple items.
10505 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10506 * Comments may be nested.
10507 * Values automatically coerce to trait objects they implement, without
10509 * Enum discriminants are no longer an entire word but as small as needed to
10510 contain all the variants. The `repr` attribute can be used to override
10511 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10512 `#[repr(C)]` to match C enums.
10513 * Non-string literals are not allowed in attributes (they never worked).
10514 * The FFI now supports variadic functions.
10515 * Octal numeric literals, as in `0o7777`.
10516 * The `concat!` syntax extension performs compile-time string concatenation.
10517 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10518 removed as Rust no longer uses segmented stacks.
10519 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10520 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10521 not `*`; ignoring remaining fields of a struct is also done with `..`,
10522 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10523 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10524 * `rustc` supports the "system" calling convention, which defaults to the
10525 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10527 * The `type_overflow` lint (default: warn) checks literals for overflow.
10528 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10529 * The `attribute_usage` lint (default: warn) warns about unknown
10531 * The `unknown_features` lint (default: warn) warns about unknown
10533 * The `dead_code` lint (default: warn) checks for dead code.
10534 * Rust libraries can be linked statically to one another
10535 * `#[link_args]` is behind the `link_args` feature gate.
10536 * Native libraries are now linked with `#[link(name = "foo")]`
10537 * Native libraries can be statically linked to a rust crate
10538 (`#[link(name = "foo", kind = "static")]`).
10539 * Native OS X frameworks are now officially supported
10540 (`#[link(name = "foo", kind = "framework")]`).
10541 * The `#[thread_local]` attribute creates thread-local (not task-local)
10542 variables. Currently behind the `thread_local` feature gate.
10543 * The `return` keyword may be used in closures.
10544 * Types that can be copied via a memcpy implement the `Pod` kind.
10545 * The `cfg` attribute can now be used on struct fields and enum variants.
10548 * std: The `option` and `result` API's have been overhauled to make them
10549 simpler, more consistent, and more composable.
10550 * std: The entire `std::io` module has been replaced with one that is
10551 more comprehensive and that properly interfaces with the underlying
10552 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10554 * std: `io::util` contains a number of useful implementations of
10555 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10556 `ZeroReader`, `TeeReader`.
10557 * std: The reference counted pointer type `extra::rc` moved into std.
10558 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10559 just a wrapper around it).
10560 * std: The `Either` type has been removed.
10561 * std: `fmt::Default` can be implemented for any type to provide default
10562 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10563 * std: The `rand` API continues to be tweaked.
10564 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10565 on failure in gdb, is now named `rust_fail`.
10566 * std: The `each_key` and `each_value` methods on `HashMap` have been
10567 replaced by the `keys` and `values` iterators.
10568 * std: Functions dealing with type size and alignment have moved from the
10569 `sys` module to the `mem` module.
10570 * std: The `path` module was written and API changed.
10571 * std: `str::from_utf8` has been changed to cast instead of allocate.
10572 * std: `starts_with` and `ends_with` methods added to vectors via the
10573 `ImmutableEqVector` trait, which is in the prelude.
10574 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10575 if the index is out of bounds.
10576 * std: Task failure no longer propagates between tasks, as the model was
10577 complex, expensive, and incompatible with thread-based tasks.
10578 * std: The `Any` type can be used for dynamic typing.
10579 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10581 * std: Methods that produce iterators generally do not have an `_iter`
10583 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10584 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10585 * std: `util::ignore` renamed to `prelude::drop`.
10586 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10588 * std: `vec::raw` has seen a lot of cleanup and API changes.
10589 * std: The standard library no longer includes any C++ code, and very
10590 minimal C, eliminating the dependency on libstdc++.
10591 * std: Runtime scheduling and I/O functionality has been factored out into
10592 extensible interfaces and is now implemented by two different crates:
10593 libnative, for native threading and I/O; and libgreen, for green threading
10594 and I/O. This paves the way for using the standard library in more limited
10595 embedded environments.
10596 * std: The `comm` module has been rewritten to be much faster, have a
10597 simpler, more consistent API, and to work for both native and green
10599 * std: All libuv dependencies have been moved into the rustuv crate.
10600 * native: New implementations of runtime scheduling on top of OS threads.
10601 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10603 * green: The green thread scheduler and message passing types are almost
10604 entirely lock-free.
10605 * extra: The `flatpipes` module had bitrotted and was removed.
10606 * extra: All crypto functions have been removed and Rust now has a policy of
10607 not reimplementing crypto in the standard library. In the future crypto
10608 will be provided by external crates with bindings to established libraries.
10609 * extra: `c_vec` has been modernized.
10610 * extra: The `sort` module has been removed. Use the `sort` method on
10614 * The `rust` and `rusti` commands have been removed, due to lack of
10616 * `rustdoc` was completely rewritten.
10617 * `rustdoc` can test code examples in documentation.
10618 * `rustpkg` can test packages with the argument, 'test'.
10619 * `rustpkg` supports arbitrary dependencies, including C libraries.
10620 * `rustc`'s support for generating debug info is improved again.
10621 * `rustc` has better error reporting for unbalanced delimiters.
10622 * `rustc`'s JIT support was removed due to bitrot.
10623 * Executables and static libraries can be built with LTO (-Z lto)
10624 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10628 Version 0.8 (2013-09-26)
10629 ============================
10631 * ~2200 changes, numerous bugfixes
10634 * The `for` loop syntax has changed to work with the `Iterator` trait.
10635 * At long last, unwinding works on Windows.
10636 * Default methods are ready for use.
10637 * Many trait inheritance bugs fixed.
10638 * Owned and borrowed trait objects work more reliably.
10639 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10640 * rustc can omit emission of code for the `debug!` macro if it is passed
10642 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10643 for foo.rs, then foo/mod.rs, and will generate an error when both are
10645 * Strings no longer contain trailing nulls. The new `std::c_str` module
10646 provides new mechanisms for converting to C strings.
10647 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10648 * The FFI has been overhauled such that foreign functions are called directly,
10649 instead of through a stack-switching wrapper.
10650 * Calling a foreign function must be done through a Rust function with the
10651 `#[fixed_stack_segment]` attribute.
10652 * The `externfn!` macro can be used to declare both a foreign function and
10653 a `#[fixed_stack_segment]` wrapper at once.
10654 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10655 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10656 * `priv` is disallowed everywhere except for struct fields and enum variants.
10657 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10658 * `ref` bindings in irrefutable patterns work correctly now.
10659 * `char` is now prevented from containing invalid code points.
10660 * Casting to `bool` is no longer allowed.
10661 * `\0` is now accepted as an escape in chars and strings.
10662 * `yield` is a reserved keyword.
10663 * `typeof` is a reserved keyword.
10664 * Crates may be imported by URL with `extern mod foo = "url";`.
10665 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10666 * Static vectors can be initialized with repeating elements,
10667 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10668 * Static structs can be initialized with functional record update,
10669 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10670 * `cfg!` can be used to conditionally execute code based on the crate
10671 configuration, similarly to `#[cfg(...)]`.
10672 * The `unnecessary_qualification` lint detects unneeded module
10673 prefixes (default: allow).
10674 * Arithmetic operations have been implemented on the SIMD types in
10675 `std::unstable::simd`.
10676 * Exchange allocation headers were removed, reducing memory usage.
10677 * `format!` implements a completely new, extensible, and higher-performance
10678 string formatting system. It will replace `fmt!`.
10679 * `print!` and `println!` write formatted strings (using the `format!`
10680 extension) to stdout.
10681 * `write!` and `writeln!` write formatted strings (using the `format!`
10682 extension) to the new Writers in `std::rt::io`.
10683 * The library section in which a function or static is placed may
10684 be specified with `#[link_section = "..."]`.
10685 * The `proto!` syntax extension for defining bounded message protocols
10687 * `macro_rules!` is hygienic for `let` declarations.
10688 * The `#[export_name]` attribute specifies the name of a symbol.
10689 * `unreachable!` can be used to indicate unreachable code, and fails
10693 * std: Transitioned to the new runtime, written in Rust.
10694 * std: Added an experimental I/O library, `rt::io`, based on the new
10696 * std: A new generic `range` function was added to the prelude, replacing
10697 `uint::range` and friends.
10698 * std: `range_rev` no longer exists. Since range is an iterator it can be
10699 reversed with `range(lo, hi).invert()`.
10700 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10701 renamed to `unwrap_or`.
10702 * std: The `iterator` module was renamed to `iter`.
10703 * std: Integral types now support the `checked_add`, `checked_sub`, and
10704 `checked_mul` operations for detecting overflow.
10705 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10707 * std: Methods are standardizing on conventions for casting methods:
10708 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10710 * std: The `CString` type in `c_str` provides new ways to convert to and
10712 * std: `DoubleEndedIterator` can yield elements in two directions.
10713 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10715 * std: `str::from_bytes` renamed to `str::from_utf8`.
10716 * std: `pop_opt` and `shift_opt` methods added to vectors.
10717 * std: The task-local data interface no longer uses @, and keys are
10718 no longer function pointers.
10719 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10720 * std: Added `SharedPort` to `comm`.
10721 * std: `Eq` has a default method for `ne`; only `eq` is required
10722 in implementations.
10723 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10724 is required in implementations.
10725 * std: `is_utf8` performance is improved, impacting many string functions.
10726 * std: `os::MemoryMap` provides cross-platform mmap.
10727 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10728 are not 'in-bounds' are considered undefined.
10729 * std: Many freestanding functions in `vec` removed in favor of methods.
10730 * std: Many freestanding functions on scalar types removed in favor of
10732 * std: Many options to task builders were removed since they don't make
10733 sense in the new scheduler design.
10734 * std: More containers implement `FromIterator` so can be created by the
10736 * std: More complete atomic types in `unstable::atomics`.
10737 * std: `comm::PortSet` removed.
10738 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10739 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10740 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10741 default implementations.
10742 * std: Various `from_str` functions were removed in favor of a generic
10743 `from_str` which is available in the prelude.
10744 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10745 * extra: `dlist`, the doubly-linked list was modernized.
10746 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10747 * extra: Added `glob` module, replacing `std::os::glob`.
10748 * extra: `rope` was removed.
10749 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10750 * extra: `net`, and `timer` were removed. The experimental replacements
10751 are `std::rt::io::net` and `std::rt::io::timer`.
10752 * extra: Iterators implemented for `SmallIntMap`.
10753 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10754 * extra: `SmallIntSet` removed. Use `BitvSet`.
10755 * extra: Performance of JSON parsing greatly improved.
10756 * extra: `semver` updated to SemVer 2.0.0.
10757 * extra: `term` handles more terminals correctly.
10758 * extra: `dbg` module removed.
10759 * extra: `par` module removed.
10760 * extra: `future` was cleaned up, with some method renames.
10761 * extra: Most free functions in `getopts` were converted to methods.
10764 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10765 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10766 similarly to gcc's `--march` flag.
10767 * rustc's performance compiling small crates is much better.
10768 * rustpkg has received many improvements.
10769 * rustpkg supports git tags as package IDs.
10770 * rustpkg builds into target-specific directories so it can be used for
10772 * The number of concurrent test tasks is controlled by the environment
10773 variable RUST_TEST_TASKS.
10774 * The test harness can now report metrics for benchmarks.
10775 * All tools have man pages.
10776 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10777 * The runtime uses jemalloc for allocations.
10778 * Segmented stacks are temporarily disabled as part of the transition to
10779 the new runtime. Stack overflows are possible!
10780 * A new documentation backend, rustdoc_ng, is available for use. It is
10781 still invoked through the normal `rustdoc` command.
10784 Version 0.7 (2013-07-03)
10785 =======================
10787 * ~2000 changes, numerous bugfixes
10790 * `impl`s no longer accept a visibility qualifier. Put them on methods
10792 * The borrow checker has been rewritten with flow-sensitivity, fixing
10793 many bugs and inconveniences.
10794 * The `self` parameter no longer implicitly means `&'self self`,
10795 and can be explicitly marked with a lifetime.
10796 * Overloadable compound operators (`+=`, etc.) have been temporarily
10797 removed due to bugs.
10798 * The `for` loop protocol now requires `for`-iterators to return `bool`
10799 so they compose better.
10800 * The `Durable` trait is replaced with the `'static` bounds.
10801 * Trait default methods work more often.
10802 * Structs with the `#[packed]` attribute have byte alignment and
10803 no padding between fields.
10804 * Type parameters bound by `Copy` must now be copied explicitly with
10805 the `copy` keyword.
10806 * It is now illegal to move out of a dereferenced unsafe pointer.
10807 * `Option<~T>` is now represented as a nullable pointer.
10808 * `@mut` does dynamic borrow checks correctly.
10809 * The `main` function is only detected at the topmost level of the crate.
10810 The `#[main]` attribute is still valid anywhere.
10811 * Struct fields may no longer be mutable. Use inherited mutability.
10812 * The `#[no_send]` attribute makes a type that would otherwise be
10814 * The `#[no_freeze]` attribute makes a type that would otherwise be
10816 * Unbounded recursion will abort the process after reaching the limit
10817 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10818 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10819 are never implicitly copyable.
10820 * `#[static_assert]` makes compile-time assertions about static bools.
10821 * At long last, 'argument modes' no longer exist.
10822 * The rarely used `use mod` statement no longer exists.
10824 * Syntax extensions
10825 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10827 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10828 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10829 `#[deriving(...)]`.
10830 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10831 and unsuffixed integer literals.
10834 * The `core` crate was renamed to `std`.
10835 * The `std` crate was renamed to `extra`.
10836 * More and improved documentation.
10837 * std: `iterator` module for external iterator objects.
10838 * Many old-style (internal, higher-order function) iterators replaced by
10839 implementations of `Iterator`.
10840 * std: Many old internal vector and string iterators,
10841 incl. `any`, `all`. removed.
10842 * std: The `finalize` method of `Drop` renamed to `drop`.
10843 * std: The `drop` method now takes `&mut self` instead of `&self`.
10844 * std: The prelude no longer re-exports any modules, only types and traits.
10845 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10846 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10847 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10848 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10849 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10850 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10851 * std: Many types implement `Clone`.
10852 * std: `path` type renamed to `Path`.
10853 * std: `mut` module and `Mut` type removed.
10854 * std: Many standalone functions removed in favor of methods and iterators
10855 in `vec`, `str`. In the future methods will also work as functions.
10856 * std: `reinterpret_cast` removed. Use `transmute`.
10857 * std: ascii string handling in `std::ascii`.
10858 * std: `Rand` is implemented for ~/@.
10859 * std: `run` module for spawning processes overhauled.
10860 * std: Various atomic types added to `unstable::atomic`.
10861 * std: Various types implement `Zero`.
10862 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10863 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10864 * std: Added `os::mkdir_recursive`.
10865 * std: Added `os::glob` function performs filesystems globs.
10866 * std: `FuzzyEq` renamed to `ApproxEq`.
10867 * std: `Map` now defines `pop` and `swap` methods.
10868 * std: `Cell` constructors converted to static methods.
10869 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10870 * extra: `flate` module moved from `std` to `extra`.
10871 * extra: `fileinput` module for iterating over a series of files.
10872 * extra: `Complex` number type and `complex` module.
10873 * extra: `Rational` number type and `rational` module.
10874 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10875 * extra: `term` uses terminfo now, is more correct.
10876 * extra: `arc` functions converted to methods.
10877 * extra: Implementation of fixed output size variations of SHA-2.
10880 * `unused_variables` lint mode for unused variables (default: warn).
10881 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10883 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10885 * `dead_assignment` lint mode for unread variables (default: warn).
10886 * `unnecessary_allocation` lint mode detects some heap allocations that are
10887 immediately borrowed so could be written without allocating (default: warn).
10888 * `missing_doc` lint mode (default: allow).
10889 * `unreachable_code` lint mode (default: warn).
10890 * The `rusti` command has been rewritten and a number of bugs addressed.
10891 * rustc outputs in color on more terminals.
10892 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10893 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10894 * Compiling with `-g` will make the binary record information about
10895 dynamic borrowcheck failures for debugging.
10896 * rustdoc has a nicer stylesheet.
10897 * Various improvements to rustdoc.
10898 * Improvements to rustpkg (see the detailed release notes).
10901 Version 0.6 (2013-04-03)
10902 ========================
10904 * ~2100 changes, numerous bugfixes
10907 * The self type parameter in traits is now spelled `Self`
10908 * The `self` parameter in trait and impl methods must now be explicitly
10909 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10910 * Static methods no longer require the `static` keyword and instead
10911 are distinguished by the lack of a `self` parameter
10912 * Replaced the `Durable` trait with the `'static` lifetime
10913 * The old closure type syntax with the trailing sigil has been
10914 removed in favor of the more consistent leading sigil
10915 * `super` is a keyword, and may be prefixed to paths
10916 * Trait bounds are separated with `+` instead of whitespace
10917 * Traits are implemented with `impl Trait for Type`
10918 instead of `impl Type: Trait`
10919 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10920 * The `export` keyword has finally been removed
10921 * The `move` keyword has been removed (see "Semantic changes")
10922 * The interior mutability qualifier on vectors, `[mut T]`, has been
10923 removed. Use `&mut [T]`, etc.
10924 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10925 * `fail` is no longer a keyword. Use `fail!()`
10926 * `assert` is no longer a keyword. Use `assert!()`
10927 * `log` is no longer a keyword. use `debug!`, etc.
10928 * 1-tuples may be represented as `(T,)`
10929 * Struct fields may no longer be `mut`. Use inherited mutability,
10930 `@mut T`, `core::mut` or `core::cell`
10931 * `extern mod { ... }` is no longer valid syntax for foreign
10932 function modules. Use extern blocks: `extern { ... }`
10933 * Newtype enums removed. Use tuple-structs.
10934 * Trait implementations no longer support visibility modifiers
10935 * Pattern matching over vectors improved and expanded
10936 * `const` renamed to `static` to correspond to lifetime name,
10937 and make room for future `static mut` unsafe mutable globals.
10938 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10939 * `Clone` implementations can be automatically generated with
10940 `#[deriving(Clone)]`
10941 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10942 instead of `foo as Bar`.
10943 * Fixed length vector types are now written as `[int, .. 3]`
10944 instead of `[int * 3]`.
10945 * Fixed length vector types can express the length as a constant
10946 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10949 * Types with owned pointers or custom destructors move by default,
10950 eliminating the `move` keyword
10951 * All foreign functions are considered unsafe
10952 * &mut is now unaliasable
10953 * Writes to borrowed @mut pointers are prevented dynamically
10955 * The name of the main function can be customized using #[main]
10956 * The default type of an inferred closure is &fn instead of @fn
10957 * `use` statements may no longer be "chained" - they cannot import
10958 identifiers imported by previous `use` statements
10959 * `use` statements are crate relative, importing from the "top"
10960 of the crate by default. Paths may be prefixed with `super::`
10961 or `self::` to change the search behavior.
10962 * Method visibility is inherited from the implementation declaration
10963 * Structural records have been removed
10964 * Many more types can be used in static items, including enums
10965 'static-lifetime pointers and vectors
10966 * Pattern matching over vectors improved and expanded
10967 * Typechecking of closure types has been overhauled to
10968 improve inference and eliminate unsoundness
10969 * Macros leave scope at the end of modules, unless that module is
10970 tagged with #[macro_escape]
10973 * Added big integers to `std::bigint`
10974 * Removed `core::oldcomm` module
10975 * Added pipe-based `core::comm` module
10976 * Numeric traits have been reorganized under `core::num`
10977 * `vec::slice` finally returns a slice
10978 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10979 * Containers reorganized around traits in `core::container`
10980 * `core::dvec` removed, `~[T]` is a drop-in replacement
10981 * `core::send_map` renamed to `core::hashmap`
10982 * `std::map` removed; replaced with `core::hashmap`
10983 * `std::treemap` reimplemented as an owned balanced tree
10984 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10985 * `core::trie` added as a fast ordered map for integer keys
10986 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10987 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10988 overload the comparison operators, whereas `TotalOrd` is used
10989 by certain container types
10992 * Replaced the 'cargo' package manager with 'rustpkg'
10993 * Added all-purpose 'rust' tool
10994 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10995 * rustc now *attempts* to offer spelling suggestions
10996 * Improved support for ARM and Android
10997 * Preliminary MIPS backend
10998 * Improved foreign function ABI implementation for x86, x86_64
10999 * Various memory usage improvements
11000 * Rust code may be embedded in foreign code under limited circumstances
11001 * Inline assembler supported by new asm!() syntax extension.
11004 Version 0.5 (2012-12-21)
11005 ===========================
11007 * ~900 changes, numerous bugfixes
11010 * Removed `<-` move operator
11011 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11012 * Removed old fixed length vector syntax - `[T]/N`
11013 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11014 * Macros may now expand to items and statements
11015 * `a.b()` is always parsed as a method call, never as a field projection
11016 * `Eq` and `IterBytes` implementations can be automatically generated
11017 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11018 * Removed the special crate language for `.rc` files
11019 * Function arguments may consist of any irrefutable pattern
11022 * `&` and `~` pointers may point to objects
11023 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11024 * Enum variants may be structs
11025 * Destructors can be added to all nominal types with the Drop trait
11026 * Structs and nullary enum variants may be constants
11027 * Values that cannot be implicitly copied are now automatically moved
11028 without writing `move` explicitly
11029 * `&T` may now be coerced to `*T`
11030 * Coercions happen in `let` statements as well as function calls
11031 * `use` statements now take crate-relative paths
11032 * The module and type namespaces have been merged so that static
11033 method names can be resolved under the trait in which they are
11036 * Improved support for language features
11037 * Trait inheritance works in many scenarios
11038 * More support for explicit self arguments in methods - `self`, `&self`
11039 `@self`, and `~self` all generally work as expected
11040 * Static methods work in more situations
11041 * Experimental: Traits may declare default methods for the implementations
11045 * New condition handling system in `core::condition`
11046 * Timsort added to `std::sort`
11047 * New priority queue, `std::priority_queue`
11048 * Pipes for serializable types, `std::flatpipes'
11049 * Serialization overhauled to be trait-based
11050 * Expanded `getopts` definitions
11051 * Moved futures to `std`
11052 * More functions are pure now
11053 * `core::comm` renamed to `oldcomm`. Still deprecated
11054 * `rustdoc` and `cargo` are libraries now
11057 * Added a preliminary REPL, `rusti`
11058 * License changed from MIT to dual MIT/APL2
11061 Version 0.4 (2012-10-15)
11062 ==========================
11064 * ~2000 changes, numerous bugfixes
11067 * All keywords are now strict and may not be used as identifiers anywhere
11068 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11069 'of', 'with', 'to', 'class'.
11070 * Classes are replaced with simpler structs
11071 * Explicit method self types
11072 * `ret` became `return` and `alt` became `match`
11073 * `import` is now `use`; `use is now `extern mod`
11074 * `extern mod { ... }` is now `extern { ... }`
11075 * `use mod` is the recommended way to import modules
11076 * `pub` and `priv` replace deprecated export lists
11077 * The syntax of `match` pattern arms now uses fat arrow (=>)
11078 * `main` no longer accepts an args vector; use `os::args` instead
11081 * Trait implementations are now coherent, ala Haskell typeclasses
11082 * Trait methods may be static
11083 * Argument modes are deprecated
11084 * Borrowed pointers are much more mature and recommended for use
11085 * Strings and vectors in the static region are stored in constant memory
11086 * Typestate was removed
11087 * Resolution rewritten to be more reliable
11088 * Support for 'dual-mode' data structures (freezing and thawing)
11091 * Most binary operators can now be overloaded via the traits in
11093 * `std::net::url` for representing URLs
11094 * Sendable hash maps in `core::send_map`
11095 * `core::task' gained a (currently unsafe) task-local storage API
11098 * An efficient new intertask communication primitive called the pipe,
11099 along with a number of higher-level channel types, in `core::pipes`
11100 * `std::arc`, an atomically reference counted, immutable, shared memory
11102 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11103 * Futures are now based on pipes and sendable
11104 * More robust linked task failure
11105 * Improved task builder API
11108 * Improved error reporting
11109 * Preliminary JIT support
11110 * Preliminary work on precise GC
11111 * Extensive architectural improvements to rustc
11112 * Begun a transition away from buggy C++-based reflection (shape) code to
11113 Rust-based (visitor) code
11114 * All hash functions and tables converted to secure, randomized SipHash
11117 Version 0.3 (2012-07-12)
11118 ========================
11120 * ~1900 changes, numerous bugfixes
11122 * New coding conveniences
11123 * Integer-literal suffix inference
11124 * Per-item control over warnings, errors
11125 * #[cfg(windows)] and #[cfg(unix)] attributes
11126 * Documentation comments
11127 * More compact closure syntax
11128 * 'do' expressions for treating higher-order functions as
11130 * *-patterns (wildcard extended to all constructor fields)
11133 * Name resolution pass and exhaustiveness checker rewritten
11134 * Region pointers and borrow checking supersede alias
11136 * Init-ness checking is now provided by a region-based liveness
11137 pass instead of the typestate pass; same for last-use analysis
11138 * Extensive work on region pointers
11140 * Experimental new language features
11141 * Slices and fixed-size, interior-allocated vectors
11142 * #!-comments for lang versioning, shell execution
11143 * Destructors and iface implementation for classes;
11144 type-parameterized classes and class methods
11145 * 'const' type kind for types that can be used to implement
11146 shared-memory concurrency patterns
11150 * Removal of various obsolete features
11151 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11152 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11154 * Constructs: do-while loops ('do' repurposed), fn binding,
11155 resources (replaced by destructors)
11157 * Compiler reorganization
11158 * Syntax-layer of compiler split into separate crate
11159 * Clang (from LLVM project) integrated into build
11160 * Typechecker split into sub-modules
11163 * New time functions
11164 * Extension methods for many built-in types
11165 * Arc: atomic-refcount read-only / exclusive-use shared cells
11166 * Par: parallel map and search routines
11167 * Extensive work on libuv interface
11168 * Much vector code moved to libraries
11169 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11170 #include, #include_str, #include_bin
11172 * Tool improvements
11173 * Cargo automatically resolves dependencies
11176 Version 0.2 (2012-03-29)
11177 =========================
11179 * >1500 changes, numerous bugfixes
11181 * New docs and doc tooling
11183 * New port: FreeBSD x86_64
11185 * Compilation model enhancements
11186 * Generics now specialized, multiply instantiated
11187 * Functions now inlined across separate crates
11189 * Scheduling, stack and threading fixes
11190 * Noticeably improved message-passing performance
11191 * Explicit schedulers
11195 * Experimental new language features
11196 * Operator overloading
11200 * Various language extensions
11201 * C-callback function types: 'crust fn ...'
11202 * Infinite-loop construct: 'loop { ... }'
11203 * Shorten 'mutable' to 'mut'
11204 * Required mutable-local qualifier: 'let mut ...'
11205 * Basic glob-exporting: 'export foo::*;'
11206 * Alt now exhaustive, 'alt check' for runtime-checked
11207 * Block-function form of 'for' loop, with 'break' and 'ret'.
11210 * AST quasi-quote syntax extension
11211 * Revived libuv interface
11212 * New modules: core::{future, iter}, std::arena
11213 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11214 * Extensive cleanup, regularization in libstd, libcore
11217 Version 0.1 (2012-01-20)
11218 ===============================
11220 * Most language features work, including:
11221 * Unique pointers, unique closures, move semantics
11222 * Interface-constrained generics
11223 * Static interface dispatch
11225 * Multithread task scheduling
11226 * Typestate predicates
11227 * Failure unwinding, destructors
11228 * Pattern matching and destructuring assignment
11229 * Lightweight block-lambda syntax
11230 * Preliminary macro-by-example
11232 * Compiler works with the following configurations:
11233 * Linux: x86 and x86_64 hosts and targets
11234 * macOS: x86 and x86_64 hosts and targets
11235 * Windows: x86 hosts and targets
11237 * Cross compilation / multi-target configuration supported.
11239 * Preliminary API-documentation and package-management tools included.
11243 * Documentation is incomplete.
11245 * Performance is below intended target.
11247 * Standard library APIs are subject to extensive change, reorganization.
11249 * Language-level versioning is not yet operational - future code will
11250 break unexpectedly.