1 Version 1.61.0 (2022-05-19)
2 ==========================
7 - [`const fn` signatures can now include generic trait bounds][93827]
8 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
9 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
10 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
15 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
16 - [Update to LLVM 14.0.0][95247]
17 - [The `char` type is now described as UTF-8 (`DW_ATE_UTF`) in DWARF debuginfo][89887]
18 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
19 - [`#[target_feature = "adx"]` is now stable][93745]
20 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
25 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
26 - [Windows paths longer than 260 chars are now supported in `process::Command` without needing explicit canonoicalization][92519]
27 - [`#[ignore = "…"]` messages are printed when running tests][92714]
28 - [Consistently present absent stdio handles on Windows as NULL handles][93263]
29 - [Make `std::io::stdio::lock()` return `'static` handles][93965]
30 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
31 - [Use cgroup quotas for calculating `available_parallelism` on Linux][92697]
36 - [`From<&[T; N]>` for `Vec<T>`][95098]
37 - [`From<&mut [T; N]>` for `Vec<T>`][95098]
38 - [`Pin::static_mut`][93580]
39 - [`Pin::static_ref`][93580]
40 - [`Vec::retain_mut`][95491]
41 - [`VecDeque::retain_mut`][95491]
42 - [`Write` for `Cursor<[u8; N]>`][92663]
43 - [`std::os::unix::net::SocketAddr::from_pathname`][94356]
44 - [`std::process::ExitCode`][93840]
45 - [`std::process::Termination`][93840]
46 - [`std::thread::JoinHandle::is_finished`][95130]
48 These APIs are now usable in const contexts:
50 - [`*const T::offset` and `*mut T::offset`][93957]
51 - [`*const T::wrapping_offset` and `*mut T::wrapping_offset`][93957]
52 - [`*const T::add` and `*mut T::add`][93957]
53 - [`*const T::sub` and `*mut T::sub`][93957]
54 - [`*const T::wrapping_add` and `*mut T::wrapping_add`][93957]
55 - [`*const T::wrapping_sub` and `*mut T::wrapping_sub`][93957]
56 - [`[T]::as_mut_ptr`][93957]
57 - [`[T]::as_ptr_range`][93957]
58 - [`[T]::as_mut_ptr_range`][93957]
63 No feature changes, but see compatibility notes.
68 - [Disable `#[thread_local]` support on i686-pc-windows-msvc][95430]
69 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
70 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
71 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
72 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
73 - [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting][94295]
74 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
79 These changes provide no direct user facing benefits, but represent significant
80 improvements to the internals and overall performance of rustc
83 - [debuginfo: Refactor debuginfo generation for types][94261]
84 - [Remove the everybody loops pass][93913]
86 [88375]: https://github.com/rust-lang/rust/pull/88375/
87 [89887]: https://github.com/rust-lang/rust/pull/89887/
88 [90621]: https://github.com/rust-lang/rust/pull/90621/
89 [92285]: https://github.com/rust-lang/rust/pull/92285/
90 [92472]: https://github.com/rust-lang/rust/pull/92472/
91 [92519]: https://github.com/rust-lang/rust/pull/92519/
92 [92663]: https://github.com/rust-lang/rust/pull/92663/
93 [92697]: https://github.com/rust-lang/rust/pull/92697/
94 [92714]: https://github.com/rust-lang/rust/pull/92714/
95 [92911]: https://github.com/rust-lang/rust/pull/92911/
96 [93263]: https://github.com/rust-lang/rust/pull/93263/
97 [93580]: https://github.com/rust-lang/rust/pull/93580/
98 [93745]: https://github.com/rust-lang/rust/pull/93745/
99 [93827]: https://github.com/rust-lang/rust/pull/93827/
100 [93840]: https://github.com/rust-lang/rust/pull/93840/
101 [93901]: https://github.com/rust-lang/rust/pull/93901/
102 [93913]: https://github.com/rust-lang/rust/pull/93913/
103 [93957]: https://github.com/rust-lang/rust/pull/93957/
104 [93965]: https://github.com/rust-lang/rust/pull/93965/
105 [94081]: https://github.com/rust-lang/rust/pull/94081/
106 [94261]: https://github.com/rust-lang/rust/pull/94261/
107 [94295]: https://github.com/rust-lang/rust/pull/94295/
108 [94356]: https://github.com/rust-lang/rust/pull/94356/
109 [94832]: https://github.com/rust-lang/rust/pull/94832/
110 [95016]: https://github.com/rust-lang/rust/pull/95016/
111 [95098]: https://github.com/rust-lang/rust/pull/95098/
112 [95130]: https://github.com/rust-lang/rust/pull/95130/
113 [95247]: https://github.com/rust-lang/rust/pull/95247/
114 [95251]: https://github.com/rust-lang/rust/pull/95251/
115 [95430]: https://github.com/rust-lang/rust/pull/95430/
116 [95491]: https://github.com/rust-lang/rust/pull/95491/
117 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
118 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
121 Version 1.60.0 (2022-04-07)
122 ==========================
126 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
127 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
131 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
132 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
133 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
134 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
135 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
136 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
137 - [Fix invalid removal of newlines from doc comments][92357]
138 - [Add kernel target for RustyHermit][92670]
139 - [Deny mixing bin crate type with lib crate types][92933]
140 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
141 - [Upgrade to LLVM 14][93577]
143 \* Refer to Rust's [platform support page][platform-support-doc] for more
144 information on Rust's tiered platform support.
148 - [Guarantee call order for `sort_by_cached_key`][89621]
149 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
150 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
151 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
152 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
156 - [`Arc::new_cyclic`][arc_new_cyclic]
157 - [`Rc::new_cyclic`][rc_new_cyclic]
158 - [`slice::EscapeAscii`][slice_escape_ascii]
159 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
160 - [`u8::escape_ascii`][u8_escape_ascii]
161 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
162 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
163 - [`MaybeUninit::assume_init_read`][assume_init_read]
164 - [`i8::abs_diff`][i8_abs_diff]
165 - [`i16::abs_diff`][i16_abs_diff]
166 - [`i32::abs_diff`][i32_abs_diff]
167 - [`i64::abs_diff`][i64_abs_diff]
168 - [`i128::abs_diff`][i128_abs_diff]
169 - [`isize::abs_diff`][isize_abs_diff]
170 - [`u8::abs_diff`][u8_abs_diff]
171 - [`u16::abs_diff`][u16_abs_diff]
172 - [`u32::abs_diff`][u32_abs_diff]
173 - [`u64::abs_diff`][u64_abs_diff]
174 - [`u128::abs_diff`][u128_abs_diff]
175 - [`usize::abs_diff`][usize_abs_diff]
176 - [`Display for io::ErrorKind`][display_error_kind]
177 - [`From<u8> for ExitCode`][from_u8_exit_code]
178 - [`Not for !` (the "never" type)][not_never]
179 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
180 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
184 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
185 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
186 - [Stabilize namespaced and weak dependency features.][cargo/10269]
187 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
188 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
192 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
193 - [Drop rustc-docs from complete profile][93742]
194 - [bootstrap: tidy up flag handling for llvm build][93918]
198 - [Remove compiler-rt linking hack on Android][83822]
199 - [Mitigations for platforms with non-monotonic clocks have been removed from
200 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
201 instant is not guaranteed to be greater than an earlier instant anymore.
202 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
203 saturating to `0` instead][89926]. In the real world the panic happened mostly
204 on platforms with buggy monotonic clock implementations rather than catching
205 programming errors like reversing the start and end times. Such programming
206 errors will now results in `0` rather than a panic.
207 - In a future release we're planning to increase the baseline requirements for
208 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
209 your feedback in [PR #95026][95026].
214 These changes provide no direct user facing benefits, but represent significant
215 improvements to the internals and overall performance of rustc
218 - [Switch all libraries to the 2021 edition][92068]
220 [83822]: https://github.com/rust-lang/rust/pull/83822
221 [86374]: https://github.com/rust-lang/rust/pull/86374
222 [87487]: https://github.com/rust-lang/rust/pull/87487
223 [89621]: https://github.com/rust-lang/rust/pull/89621
224 [89926]: https://github.com/rust-lang/rust/pull/89926
225 [90132]: https://github.com/rust-lang/rust/pull/90132
226 [90247]: https://github.com/rust-lang/rust/pull/90247
227 [91606]: https://github.com/rust-lang/rust/pull/91606
228 [92068]: https://github.com/rust-lang/rust/pull/92068
229 [92300]: https://github.com/rust-lang/rust/pull/92300
230 [92357]: https://github.com/rust-lang/rust/pull/92357
231 [92383]: https://github.com/rust-lang/rust/pull/92383
232 [92630]: https://github.com/rust-lang/rust/pull/92630
233 [92670]: https://github.com/rust-lang/rust/pull/92670
234 [92800]: https://github.com/rust-lang/rust/pull/92800
235 [92933]: https://github.com/rust-lang/rust/pull/92933
236 [93566]: https://github.com/rust-lang/rust/pull/93566
237 [93577]: https://github.com/rust-lang/rust/pull/93577
238 [93658]: https://github.com/rust-lang/rust/pull/93658
239 [93742]: https://github.com/rust-lang/rust/pull/93742
240 [93824]: https://github.com/rust-lang/rust/pull/93824
241 [93918]: https://github.com/rust-lang/rust/pull/93918
242 [95026]: https://github.com/rust-lang/rust/pull/95026
244 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
245 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
246 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
247 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
248 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
250 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
251 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
252 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
253 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
254 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
255 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
256 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
257 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
258 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
259 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
260 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
261 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
262 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
263 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
264 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
265 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
266 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
267 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
268 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
269 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
270 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
271 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
272 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
273 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
274 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
276 Version 1.59.0 (2022-02-24)
277 ==========================
282 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
283 - [Stabilize destructuring assignment][90521]
284 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
285 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
290 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
291 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
292 - [Fix sparc64 ABI for aggregates with floating point members][91003]
293 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
294 - [Add support for riscv64gc-unknown-freebsd][91284]
295 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
296 - [Soft disable incremental compilation][94124]
298 This release disables incremental compilation, unless the user has explicitly
299 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
300 This is due to a known and relatively frequently occurring bug in incremental
301 compilation, which causes builds to issue internal compiler errors. This
302 particular bug is already fixed on nightly, but that fix has not yet rolled out
303 to stable and is deemed too risky for a direct stable backport.
305 As always, we encourage users to test with nightly and report bugs so that we
306 can track failures and fix issues earlier.
308 See [94124] for more details.
310 [94124]: https://github.com/rust-lang/rust/issues/94124
315 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
320 - [`std::thread::available_parallelism`][available_parallelism]
321 - [`Result::copied`][result-copied]
322 - [`Result::cloned`][result-cloned]
323 - [`arch::asm!`][asm]
324 - [`arch::global_asm!`][global_asm]
325 - [`ops::ControlFlow::is_break`][is_break]
326 - [`ops::ControlFlow::is_continue`][is_continue]
327 - [`TryFrom<char> for u8`][try_from_char_u8]
328 - [`char::TryFromCharError`][try_from_char_err]
329 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
331 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
332 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
333 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
334 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
335 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
336 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
337 - [`DoubleEndedIterator for ToLowercase`][lowercase]
338 - [`DoubleEndedIterator for ToUppercase`][uppercase]
339 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
340 - [`UnwindSafe for Once`][unwindsafe_once]
341 - [`RefUnwindSafe for Once`][refunwindsafe_once]
342 - [armv8 neon intrinsics for aarch64][stdarch/1266]
346 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
347 - [`mem::MaybeUninit::assume_init`][muninit_init]
348 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
349 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
354 - [Stabilize the `strip` profile option][cargo/10088]
355 - [Stabilize future-incompat-report][cargo/10165]
356 - [Support abbreviating `--release` as `-r`][cargo/10133]
357 - [Support `term.quiet` configuration][cargo/10152]
358 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
363 - [Refactor weak symbols in std::sys::unix][90846]
364 This may add new, versioned, symbols when building with a newer glibc, as the
365 standard library uses weak linkage rather than dynamically attempting to load
366 certain symbols at runtime.
367 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
368 This adds a future compatibility lint to supporting the use of cfg_attr
369 wrapping either crate_type or crate_name specification within Rust files;
370 it is recommended that users migrate to setting the equivalent command line
372 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
373 This may expose new names, leading to conflicts with preexisting names in a
374 given namespace and a compilation failure.
375 - [Cargo will document libraries before binaries.][cargo/10172]
376 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
377 - [Weaken guarantee around advancing underlying iterators in zip][83791]
378 - [Make split_inclusive() on an empty slice yield an empty output][89825]
379 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
380 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
385 These changes provide no direct user facing benefits, but represent significant
386 improvements to the internals and overall performance of rustc
389 - [Fix many cases of normalization-related ICEs][91255]
390 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
391 - [Store liveness in interval sets for region inference][90637]
393 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
394 unstable feature.][91867]
396 [91867]: https://github.com/rust-lang/rust/issues/91867
397 [83744]: https://github.com/rust-lang/rust/pull/83744/
398 [83791]: https://github.com/rust-lang/rust/pull/83791/
399 [85013]: https://github.com/rust-lang/rust/pull/85013/
400 [89825]: https://github.com/rust-lang/rust/pull/89825/
401 [89999]: https://github.com/rust-lang/rust/pull/89999/
402 [90128]: https://github.com/rust-lang/rust/pull/90128/
403 [90207]: https://github.com/rust-lang/rust/pull/90207/
404 [90521]: https://github.com/rust-lang/rust/pull/90521/
405 [90586]: https://github.com/rust-lang/rust/pull/90586/
406 [90637]: https://github.com/rust-lang/rust/pull/90637/
407 [90833]: https://github.com/rust-lang/rust/pull/90833/
408 [90846]: https://github.com/rust-lang/rust/pull/90846/
409 [91003]: https://github.com/rust-lang/rust/pull/91003/
410 [91172]: https://github.com/rust-lang/rust/pull/91172/
411 [91255]: https://github.com/rust-lang/rust/pull/91255/
412 [91284]: https://github.com/rust-lang/rust/pull/91284/
413 [91535]: https://github.com/rust-lang/rust/pull/91535/
414 [91593]: https://github.com/rust-lang/rust/pull/91593/
415 [91728]: https://github.com/rust-lang/rust/pull/91728/
416 [91878]: https://github.com/rust-lang/rust/pull/91878/
417 [91896]: https://github.com/rust-lang/rust/pull/91896/
418 [91926]: https://github.com/rust-lang/rust/pull/91926/
419 [91984]: https://github.com/rust-lang/rust/pull/91984/
420 [92020]: https://github.com/rust-lang/rust/pull/92020/
421 [92034]: https://github.com/rust-lang/rust/pull/92034/
422 [92137]: https://github.com/rust-lang/rust/pull/92137/
423 [92483]: https://github.com/rust-lang/rust/pull/92483/
424 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
425 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
426 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
427 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
428 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
429 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
430 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
431 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
433 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
434 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
435 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
436 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
437 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
438 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
439 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
440 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
441 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
442 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
443 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
444 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
445 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
446 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
447 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
448 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
449 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
450 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
451 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
452 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
453 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
454 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
455 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
456 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
457 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
458 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
460 Version 1.58.1 (2022-01-19)
461 ===========================
463 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
464 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
465 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
466 * [Fix wrong error message displayed when some imports are missing][91254]
467 * [Fix rustfmt not formatting generated files from stdin][92912]
469 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
470 [91254]: https://github.com/rust-lang/rust/pull/91254
471 [92912]: https://github.com/rust-lang/rust/pull/92912
472 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
473 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
475 Version 1.58.0 (2022-01-13)
476 ==========================
481 - [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.
482 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
483 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
488 - [Add LLVM CFI support to the Rust compiler][89652]
489 - [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.
490 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
491 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
492 - [Update the minimum external LLVM to 12][90175]
493 - [Add `x86_64-unknown-none` at Tier 3*][89062]
494 - [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.
495 - [Don't abort compilation after giving a lint error][87337]
496 - [Error messages point at the source of trait bound obligations in more places][89580]
498 \* Refer to Rust's [platform support page][platform-support-doc] for more
499 information on Rust's tiered platform support.
504 - [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.
505 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
506 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
507 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
508 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
509 - [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).
514 - [`Metadata::is_symlink`]
515 - [`Path::is_symlink`]
516 - [`{integer}::saturating_div`]
517 - [`Option::unwrap_unchecked`]
518 - [`Result::unwrap_unchecked`]
519 - [`Result::unwrap_err_unchecked`]
522 These APIs are now usable in const contexts:
525 - [`Duration::checked_add`]
526 - [`Duration::saturating_add`]
527 - [`Duration::checked_sub`]
528 - [`Duration::saturating_sub`]
529 - [`Duration::checked_mul`]
530 - [`Duration::saturating_mul`]
531 - [`Duration::checked_div`]
536 - [Add --message-format for install command][cargo/10107]
537 - [Warn when alias shadows external subcommand][cargo/10082]
542 - [Show all Deref implementations recursively in rustdoc][90183]
543 - [Use computed visibility in rustdoc][88447]
548 - [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.
549 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
550 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
551 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
552 - [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.
553 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
558 These changes provide no direct user facing benefits, but represent significant
559 improvements to the internals and overall performance of rustc
562 - [Implement coherence checks for negative trait impls][90104]
563 - [Add rustc lint, warning when iterating over hashmaps][89558]
564 - [Optimize live point computation][90491]
565 - [Enable verification for 1/32nd of queries loaded from disk][90361]
566 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
568 [87337]: https://github.com/rust-lang/rust/pull/87337/
569 [87467]: https://github.com/rust-lang/rust/pull/87467/
570 [87704]: https://github.com/rust-lang/rust/pull/87704/
571 [88041]: https://github.com/rust-lang/rust/pull/88041/
572 [88447]: https://github.com/rust-lang/rust/pull/88447/
573 [88601]: https://github.com/rust-lang/rust/pull/88601/
574 [89062]: https://github.com/rust-lang/rust/pull/89062/
575 [89174]: https://github.com/rust-lang/rust/pull/89174/
576 [89551]: https://github.com/rust-lang/rust/pull/89551/
577 [89558]: https://github.com/rust-lang/rust/pull/89558/
578 [89580]: https://github.com/rust-lang/rust/pull/89580/
579 [89652]: https://github.com/rust-lang/rust/pull/89652/
580 [90041]: https://github.com/rust-lang/rust/pull/90041/
581 [90058]: https://github.com/rust-lang/rust/pull/90058/
582 [90104]: https://github.com/rust-lang/rust/pull/90104/
583 [90117]: https://github.com/rust-lang/rust/pull/90117/
584 [90175]: https://github.com/rust-lang/rust/pull/90175/
585 [90183]: https://github.com/rust-lang/rust/pull/90183/
586 [90297]: https://github.com/rust-lang/rust/pull/90297/
587 [90329]: https://github.com/rust-lang/rust/pull/90329/
588 [90361]: https://github.com/rust-lang/rust/pull/90361/
589 [90417]: https://github.com/rust-lang/rust/pull/90417/
590 [90473]: https://github.com/rust-lang/rust/pull/90473/
591 [90491]: https://github.com/rust-lang/rust/pull/90491/
592 [90733]: https://github.com/rust-lang/rust/pull/90733/
593 [90833]: https://github.com/rust-lang/rust/pull/90833/
594 [90846]: https://github.com/rust-lang/rust/pull/90846/
595 [91026]: https://github.com/rust-lang/rust/pull/91026/
596 [91207]: https://github.com/rust-lang/rust/pull/91207/
597 [91255]: https://github.com/rust-lang/rust/pull/91255/
598 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
599 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
600 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
601 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
602 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
603 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
604 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
605 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
606 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
607 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
609 Version 1.57.0 (2021-12-02)
610 ==========================
615 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
616 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
617 - [Allow panicking in constant evaluation.][89508]
618 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
623 - [Create more accurate debuginfo for vtables.][89597]
624 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
625 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
626 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
627 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
629 \* Refer to Rust's [platform support page][platform-support-doc] for more
630 information on Rust's tiered platform support.
635 - [Avoid allocations and copying in `Vec::leak`][89337]
636 - [Add `#[repr(i8)]` to `Ordering`][89507]
637 - [Optimize `File::read_to_end` and `read_to_string`][89582]
638 - [Update to Unicode 14.0][89614]
639 - [Many more functions are marked `#[must_use]`][89692], producing a warning
640 when ignoring their return value. This helps catch mistakes such as expecting
641 a function to mutate a value in place rather than return a new value.
646 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
647 - [`[T; N]::as_slice`][`array::as_slice`]
648 - [`collections::TryReserveError`]
649 - [`HashMap::try_reserve`]
650 - [`HashSet::try_reserve`]
651 - [`String::try_reserve`]
652 - [`String::try_reserve_exact`]
653 - [`Vec::try_reserve`]
654 - [`Vec::try_reserve_exact`]
655 - [`VecDeque::try_reserve`]
656 - [`VecDeque::try_reserve_exact`]
657 - [`Iterator::map_while`]
659 - [`proc_macro::is_available`]
660 - [`Command::get_program`]
661 - [`Command::get_args`]
662 - [`Command::get_envs`]
663 - [`Command::get_current_dir`]
667 These APIs are now usable in const contexts:
669 - [`hint::unreachable_unchecked`]
674 - [Stabilize custom profiles][cargo/9943]
679 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
680 This will break some builds that set `#![deny(dead_code)]`.
684 These changes provide no direct user facing benefits, but represent significant
685 improvements to the internals and overall performance of rustc
688 - [Added an experimental backend for codegen with `libgccjit`.][87260]
690 [85200]: https://github.com/rust-lang/rust/pull/85200/
691 [86191]: https://github.com/rust-lang/rust/pull/86191/
692 [87220]: https://github.com/rust-lang/rust/pull/87220/
693 [87260]: https://github.com/rust-lang/rust/pull/87260/
694 [88321]: https://github.com/rust-lang/rust/pull/88321/
695 [88529]: https://github.com/rust-lang/rust/pull/88529/
696 [88690]: https://github.com/rust-lang/rust/pull/88690/
697 [88952]: https://github.com/rust-lang/rust/pull/88952/
698 [89337]: https://github.com/rust-lang/rust/pull/89337/
699 [89507]: https://github.com/rust-lang/rust/pull/89507/
700 [89508]: https://github.com/rust-lang/rust/pull/89508/
701 [89582]: https://github.com/rust-lang/rust/pull/89582/
702 [89597]: https://github.com/rust-lang/rust/pull/89597/
703 [89614]: https://github.com/rust-lang/rust/pull/89614/
704 [89692]: https://github.com/rust-lang/rust/issues/89692/
705 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
706 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
707 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
708 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
709 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
710 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
711 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
712 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
713 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
714 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
715 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
716 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
717 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
718 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
719 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
720 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
721 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
722 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
723 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
724 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
725 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
727 Version 1.56.1 (2021-11-01)
728 ===========================
730 - New lints to detect the presence of bidirectional-override Unicode
731 codepoints in the compiled source code ([CVE-2021-42574])
733 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
735 Version 1.56.0 (2021-10-21)
736 ========================
741 - [The 2021 Edition is now stable.][rust#88100]
742 See [the edition guide][rust-2021-edition-guide] for more details.
743 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
744 - [Union field access is permitted in `const fn`.][rust#85769]
746 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
751 - [Upgrade to LLVM 13.][rust#87570]
752 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
753 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
754 - [Warnings can be forced on with `--force-warn`.][rust#87472]
755 This feature is primarily intended for usage by `cargo fix`, rather than end users.
756 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
757 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
758 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
760 \* Refer to Rust's [platform support page][platform-support-doc] for more
761 information on Rust's tiered platform support.
766 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
767 The Windows console still requires valid Unicode, but this change allows
768 splitting a UTF-8 character across multiple write calls. This allows, for
769 instance, programs that just read and write data buffers (e.g. copying a file
770 to stdout) without regard for Unicode or character boundaries.
771 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
772 For this use case, atomics scale much better under contention.
773 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
774 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
775 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
776 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
777 - [Treat invalid environment variable names as non-existent.][rust#86183]
778 Previously, the environment functions would panic if given a variable name
779 with an internal null character or equal sign (`=`). Now, these functions will
780 just treat such names as non-existent variables, since the OS cannot represent
781 the existence of a variable with such a name.
786 - [`std::os::unix::fs::chroot`]
787 - [`UnsafeCell::raw_get`]
788 - [`BufWriter::into_parts`]
789 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
790 These APIs were previously stable in `std`, but are now also available in `core`.
792 - [`String::shrink_to`]
793 - [`OsString::shrink_to`]
794 - [`PathBuf::shrink_to`]
795 - [`BinaryHeap::shrink_to`]
796 - [`VecDeque::shrink_to`]
797 - [`HashMap::shrink_to`]
798 - [`HashSet::shrink_to`]
800 These APIs are now usable in const contexts:
802 - [`std::mem::transmute`]
803 - [`[T]::first`][`slice::first`]
804 - [`[T]::split_first`][`slice::split_first`]
805 - [`[T]::last`][`slice::last`]
806 - [`[T]::split_last`][`slice::split_last`]
811 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
812 This has no effect at present on dependency version selection.
813 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
814 that support Rust code to include a crate's specified minimum version in the test matrix for that
820 - [Update to new argument parsing rules on Windows.][rust#87580]
821 This adjusts Rust's standard library to match the behavior of the standard
822 libraries for C/C++. The rules have changed slightly over time, and this PR
823 brings us to the latest set of rules (changed in 2008).
824 - [Disallow the aapcs calling convention on aarch64][rust#88399]
825 This was already not supported by LLVM; this change surfaces this lack of
826 support with a better error message.
827 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
828 - [Warn when an escaped newline skips multiple lines.][rust#87671]
829 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
830 may return different values on glibc <= 2.24.][rust#81825]
831 Rust now invokes the `clone3` system call directly, when available, to use new functionality
832 available via that system call. Older versions of glibc cache the result of `getpid`, and only
833 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
834 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
838 These changes provide no direct user facing benefits, but represent significant
839 improvements to the internals and overall performance of rustc
842 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
843 This improves the performance of most Rust builds.
844 - [Unify representation of macros in internal data structures.][rust#88019]
845 This change fixes a host of bugs with the handling of macros by the compiler,
848 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
849 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
850 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
851 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
852 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
853 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
854 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
855 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
856 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
857 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
858 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
859 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
860 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
861 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
862 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
863 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
864 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
865 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
866 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
867 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
868 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
869 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
870 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
871 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
872 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
873 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
874 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
875 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
876 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
877 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
878 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
879 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
880 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
881 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
882 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
883 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
884 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
885 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
886 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
887 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
888 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
889 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
891 Version 1.55.0 (2021-09-09)
892 ============================
896 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
897 will end at the maximum value of the integer.][83918]
898 - [You can now explicitly import the prelude of different editions
899 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
903 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
905 \* Refer to Rust's [platform support page][platform-support-doc] for more
906 information on Rust's tiered platform support.
911 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
912 These improvements should in general provide faster string parsing of floats,
913 no longer reject certain valid floating point values, and reduce
914 the produced code size for non-stripped artifacts.
915 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
922 - [`IntoInnerError::into_error`]
923 - [`IntoInnerError::into_parts`]
924 - [`MaybeUninit::assume_init_mut`]
925 - [`MaybeUninit::assume_init_ref`]
926 - [`MaybeUninit::write`]
928 - [`ops::ControlFlow`]
930 - [`x86::_bittestandcomplement`]
931 - [`x86::_bittestandreset`]
932 - [`x86::_bittestandset`]
933 - [`x86_64::_bittest64`]
934 - [`x86_64::_bittestandcomplement64`]
935 - [`x86_64::_bittestandreset64`]
936 - [`x86_64::_bittestandset64`]
938 The following previously stable functions are now `const`.
940 - [`str::from_utf8_unchecked`]
945 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
946 rustc in parallel such as when using `cargo test`.][cargo/9675]
947 - [The package definition in `cargo metadata` now includes the `"default_run"`
948 field from the manifest.][cargo/9550]
949 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
950 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
951 of packages.][cargo/9663]
955 - [Added "Go to item on exact match" search option.][85876]
956 - [The "Implementors" section on traits no longer shows redundant
957 method definitions.][85970]
958 - [Trait implementations are toggled open by default.][86260] This should make the
959 implementations more searchable by tools like `CTRL+F` in your browser.
960 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
961 through type aliases.][86334]
962 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
963 "Trait Implementations" section.][86513]
968 - [std functions that return an `io::Error` will no longer use the
969 `ErrorKind::Other` variant.][85746] This is to better reflect that these
970 kinds of errors could be categorised [into newer more specific `ErrorKind`
971 variants][79965], and that they do not represent a user error.
972 - [Using environment variable names with `process::Command` on Windows now
973 behaves as expected.][85270] Previously using envionment variables with
974 `Command` would cause them to be ASCII-uppercased.
975 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
976 with `rustdoc::`][86849]
977 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
978 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
979 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
982 [86849]: https://github.com/rust-lang/rust/pull/86849
983 [86513]: https://github.com/rust-lang/rust/pull/86513
984 [86334]: https://github.com/rust-lang/rust/pull/86334
985 [86260]: https://github.com/rust-lang/rust/pull/86260
986 [85970]: https://github.com/rust-lang/rust/pull/85970
987 [85876]: https://github.com/rust-lang/rust/pull/85876
988 [83572]: https://github.com/rust-lang/rust/pull/83572
989 [86294]: https://github.com/rust-lang/rust/pull/86294
990 [86858]: https://github.com/rust-lang/rust/pull/86858
991 [86761]: https://github.com/rust-lang/rust/pull/86761
992 [85746]: https://github.com/rust-lang/rust/pull/85746
993 [85270]: https://github.com/rust-lang/rust/pull/85270
994 [83918]: https://github.com/rust-lang/rust/pull/83918
995 [79965]: https://github.com/rust-lang/rust/pull/79965
996 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
997 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
998 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
999 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1000 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1001 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1002 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1003 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1004 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1005 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1006 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1007 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1008 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1009 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1010 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1011 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1012 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1013 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1014 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1015 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1016 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1017 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1020 Version 1.54.0 (2021-07-29)
1021 ============================
1024 -----------------------
1026 - [You can now use macros for values in some built-in attributes.][83366]
1027 This primarily allows you to call macros within the `#[doc]` attribute. For
1028 example, to include external documentation in your crate, you can now write
1031 #![doc = include_str!("README.md")]
1034 - [You can now cast between unsized slice types (and types which contain
1035 unsized slices) in `const fn`.][85078]
1036 - [You can now use multiple generic lifetimes with `impl Trait` where the
1037 lifetimes don't explicitly outlive another.][84701] In code this means
1038 that you can now have `impl Trait<'a, 'b>` where as before you could
1039 only have `impl Trait<'a, 'b> where 'b: 'a`.
1042 -----------------------
1044 - [Rustc will now search for custom JSON targets in
1045 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1046 directory.][83800] You can find your sysroot directory by running
1047 `rustc --print sysroot`.
1048 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1049 - [You can now use `#[target_feature]` on safe functions when targeting
1050 WebAssembly platforms.][84988]
1051 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1052 - [Added tier 3\* support for `bpfel-unknown-none`
1053 and `bpfeb-unknown-none`.][79608]
1054 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1056 \* Refer to Rust's [platform support page][platform-support-doc] for more
1057 information on Rust's tiered platform support.
1060 -----------------------
1062 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1063 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1064 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1065 - [The implementations of vendor intrinsics in core::arch have been
1066 significantly refactored.][83278] The main user-visible changes are
1067 a 50% reduction in the size of libcore.rlib and stricter validation
1068 of constant operands passed to intrinsics. The latter is technically
1069 a breaking change, but allows Rust to more closely match the C vendor
1075 - [`BTreeMap::into_keys`]
1076 - [`BTreeMap::into_values`]
1077 - [`HashMap::into_keys`]
1078 - [`HashMap::into_values`]
1080 - [`VecDeque::binary_search`]
1081 - [`VecDeque::binary_search_by`]
1082 - [`VecDeque::binary_search_by_key`]
1083 - [`VecDeque::partition_point`]
1088 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1089 the dependency graph.][cargo/9520]
1090 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1091 in the tree ][cargo/9499]
1092 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1093 macro dependencies.][cargo/9488]
1094 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1095 This variable points to a directory that integration tests and benches
1096 can use as a "scratchpad" for testing filesystem operations.
1100 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1101 - [Previously unsound code is no longer permitted where different constructors in branches
1102 could require different lifetimes.][85574]
1103 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
1104 than before and may reject some previously accepted code.
1105 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1106 when compiled with `codegen-units = 1`.][86063]
1108 [85574]: https://github.com/rust-lang/rust/issues/85574
1109 [86831]: https://github.com/rust-lang/rust/issues/86831
1110 [86063]: https://github.com/rust-lang/rust/issues/86063
1111 [79608]: https://github.com/rust-lang/rust/pull/79608
1112 [84988]: https://github.com/rust-lang/rust/pull/84988
1113 [84701]: https://github.com/rust-lang/rust/pull/84701
1114 [84072]: https://github.com/rust-lang/rust/pull/84072
1115 [85745]: https://github.com/rust-lang/rust/pull/85745
1116 [84744]: https://github.com/rust-lang/rust/pull/84744
1117 [85078]: https://github.com/rust-lang/rust/pull/85078
1118 [84717]: https://github.com/rust-lang/rust/pull/84717
1119 [83800]: https://github.com/rust-lang/rust/pull/83800
1120 [83366]: https://github.com/rust-lang/rust/pull/83366
1121 [83278]: https://github.com/rust-lang/rust/pull/83278
1122 [85292]: https://github.com/rust-lang/rust/pull/85292
1123 [82834]: https://github.com/rust-lang/rust/pull/82834
1124 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1125 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1126 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1127 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1128 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1129 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1130 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1131 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1132 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1133 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1134 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1136 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1138 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1140 Version 1.53.0 (2021-06-17)
1141 ============================
1144 -----------------------
1145 - [You can now use unicode for identifiers.][83799] This allows multilingual
1146 identifiers but still doesn't allow glyphs that are not considered characters
1147 such as `◆` or `🦀`. More specifically you can now use any identifier that
1148 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1149 is the same standard as languages like Python, however Rust uses NFC
1150 normalization which may be different from other languages.
1151 - [You can now specify "or patterns" inside pattern matches.][79278]
1152 Previously you could only use `|` (OR) on complete patterns. E.g.
1156 matches!(x, Some(1) | Some(2));
1158 matches!(x, Some(1 | 2));
1160 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1161 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1162 to change semantics to being a pattern fragment in a future edition.
1165 -----------------------
1166 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1167 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1168 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1170 \* Refer to Rust's [platform support page][platform-support-doc] for more
1171 information on Rust's tiered platform support.
1174 -----------------------
1175 - [Abort messages will now forward to `android_set_abort_message` on
1176 Android platforms when available.][81469]
1177 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1178 - [Arrays of any length now implement `IntoIterator`.][84147]
1179 Currently calling `.into_iter()` as a method on an array will
1180 return `impl Iterator<Item=&T>`, but this may change in a
1181 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1182 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1183 - [`leading_zeros`, and `trailing_zeros` are now available on all
1184 `NonZero` integer types.][84082]
1185 - [`{f32, f64}::from_str` now parse and print special values
1186 (`NaN`, `-0`) according to IEEE 754.][78618]
1187 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1188 - [Add the `BITS` associated constant to all numeric types.][82565]
1192 - [`AtomicBool::fetch_update`]
1193 - [`AtomicPtr::fetch_update`]
1194 - [`BTreeMap::retain`]
1195 - [`BTreeSet::retain`]
1196 - [`BufReader::seek_relative`]
1197 - [`DebugStruct::non_exhaustive`]
1199 - [`Duration::ZERO`]
1200 - [`Duration::is_zero`]
1201 - [`Duration::saturating_add`]
1202 - [`Duration::saturating_mul`]
1203 - [`Duration::saturating_sub`]
1204 - [`ErrorKind::Unsupported`]
1205 - [`Option::insert`]
1206 - [`Ordering::is_eq`]
1207 - [`Ordering::is_ge`]
1208 - [`Ordering::is_gt`]
1209 - [`Ordering::is_le`]
1210 - [`Ordering::is_lt`]
1211 - [`Ordering::is_ne`]
1212 - [`OsStr::is_ascii`]
1213 - [`OsStr::make_ascii_lowercase`]
1214 - [`OsStr::make_ascii_uppercase`]
1215 - [`OsStr::to_ascii_lowercase`]
1216 - [`OsStr::to_ascii_uppercase`]
1217 - [`Peekable::peek_mut`]
1218 - [`Rc::decrement_strong_count`]
1219 - [`Rc::increment_strong_count`]
1220 - [`Vec::extend_from_within`]
1221 - [`array::from_mut`]
1222 - [`array::from_ref`]
1223 - [`cmp::max_by_key`]
1225 - [`cmp::min_by_key`]
1227 - [`f32::is_subnormal`]
1228 - [`f64::is_subnormal`]
1231 -----------------------
1232 - [Cargo now supports git repositories where the default `HEAD` branch is not
1233 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1234 which can handle default branches correctly.
1235 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1236 - [The `authors` field is no longer included in `Cargo.toml` for new
1237 projects.][cargo/9282]
1240 -----------------------
1241 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1242 without hyperlinks.][81764]
1246 - [Implement token-based handling of attributes during expansion][82608]
1247 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1248 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1249 to confusion and potential security vulnerabilities and [is no
1250 longer recommended][ietf6943].
1251 - [The added `BITS` constant may conflict with external definitions.][85667]
1252 In particular, this was known to be a problem in the `lexical-core` crate,
1253 but they have published fixes for semantic versions 0.4 through 0.7. To
1254 update this dependency alone, use `cargo update -p lexical-core`.
1255 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1259 These changes provide no direct user facing benefits, but represent significant
1260 improvements to the internals and overall performance of rustc and
1263 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1264 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1265 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1266 - [Rework rustdoc const type][82873]
1268 [85667]: https://github.com/rust-lang/rust/pull/85667
1269 [83386]: https://github.com/rust-lang/rust/pull/83386
1270 [82771]: https://github.com/rust-lang/rust/pull/82771
1271 [84147]: https://github.com/rust-lang/rust/pull/84147
1272 [84082]: https://github.com/rust-lang/rust/pull/84082
1273 [83799]: https://github.com/rust-lang/rust/pull/83799
1274 [83681]: https://github.com/rust-lang/rust/pull/83681
1275 [83652]: https://github.com/rust-lang/rust/pull/83652
1276 [83387]: https://github.com/rust-lang/rust/pull/83387
1277 [82873]: https://github.com/rust-lang/rust/pull/82873
1278 [82864]: https://github.com/rust-lang/rust/pull/82864
1279 [82608]: https://github.com/rust-lang/rust/pull/82608
1280 [82565]: https://github.com/rust-lang/rust/pull/82565
1281 [80525]: https://github.com/rust-lang/rust/pull/80525
1282 [79278]: https://github.com/rust-lang/rust/pull/79278
1283 [78618]: https://github.com/rust-lang/rust/pull/78618
1284 [77704]: https://github.com/rust-lang/rust/pull/77704
1285 [83941]: https://github.com/rust-lang/rust/pull/83941
1286 [83065]: https://github.com/rust-lang/rust/pull/83065
1287 [81764]: https://github.com/rust-lang/rust/pull/81764
1288 [81469]: https://github.com/rust-lang/rust/pull/81469
1289 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1290 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1291 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1292 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1293 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1294 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1295 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1296 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1297 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1298 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1299 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1300 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1301 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1302 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1303 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1304 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1305 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1306 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1307 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1308 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1309 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1310 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1311 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1312 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1313 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1314 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1315 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1316 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1317 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1318 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1319 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1320 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1321 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1322 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1323 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1324 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1325 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1326 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1327 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1328 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1329 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1332 Version 1.52.1 (2021-05-10)
1333 ============================
1335 This release disables incremental compilation, unless the user has explicitly
1336 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1338 This is due to the widespread, and frequently occurring, breakage encountered by
1339 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1340 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1341 newly added incremental verification are still present in past stable versions,
1342 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1345 These problems only affect incremental builds, so release builds with Cargo
1346 should not be affected unless the user has explicitly opted into incremental.
1347 Debug and check builds are affected.
1349 See [84970] for more details.
1351 [84970]: https://github.com/rust-lang/rust/issues/84970
1353 Version 1.52.0 (2021-05-06)
1354 ============================
1358 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1359 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1360 is allowed by default, and may become a warning or hard error in a
1362 - [You can now cast mutable references to arrays to a pointer of the same type as
1363 the element.][81479]
1367 - [Upgraded the default LLVM to LLVM 12.][81451]
1369 Added tier 3\* support for the following targets.
1371 - [`s390x-unknown-linux-musl`][82166]
1372 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1373 - [`powerpc-unknown-openbsd`][82733]
1375 \* Refer to Rust's [platform support page][platform-support-doc] for more
1376 information on Rust's tiered platform support.
1380 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1381 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1382 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1383 - [All integer division and remainder operations are now `const`.][80962]
1387 - [`Arguments::as_str`]
1389 - [`char::REPLACEMENT_CHARACTER`]
1390 - [`char::UNICODE_VERSION`]
1391 - [`char::decode_utf16`]
1392 - [`char::from_digit`]
1393 - [`char::from_u32_unchecked`]
1394 - [`char::from_u32`]
1395 - [`slice::partition_point`]
1396 - [`str::rsplit_once`]
1397 - [`str::split_once`]
1399 The following previously stable APIs are now `const`.
1401 - [`char::len_utf8`]
1402 - [`char::len_utf16`]
1403 - [`char::to_ascii_uppercase`]
1404 - [`char::to_ascii_lowercase`]
1405 - [`char::eq_ignore_ascii_case`]
1406 - [`u8::to_ascii_uppercase`]
1407 - [`u8::to_ascii_lowercase`]
1408 - [`u8::eq_ignore_ascii_case`]
1412 - [Rustdoc lints are now treated as a tool lint, meaning that
1413 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1414 Using the old style is still allowed, and will become a warning in
1416 - [Rustdoc now supports argument files.][82261]
1417 - [Rustdoc now generates smart punctuation for documentation.][79423]
1418 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1426 - [You can now pass multiple filters to tests.][81356] E.g.
1427 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1428 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1429 allowing you to see `std` symbols when debugging.][82218]
1433 These changes provide no direct user facing benefits, but represent significant
1434 improvements to the internals and overall performance of rustc and
1437 - [Check the result cache before the DepGraph when ensuring queries][81855]
1438 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1439 - [Only store a LocalDefId in some HIR nodes][81611]
1440 - [Store HIR attributes in a side table][79519]
1444 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1445 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1446 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1447 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1448 languages in code blocks.][78429]
1449 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1450 - [Changes in how proc macros handle whitespace may lead to panics when used
1451 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1452 - [Turn `#[derive]` into a regular macro attribute][79078]
1454 [84136]: https://github.com/rust-lang/rust/issues/84136
1455 [80763]: https://github.com/rust-lang/rust/pull/80763
1456 [82166]: https://github.com/rust-lang/rust/pull/82166
1457 [82121]: https://github.com/rust-lang/rust/pull/82121
1458 [81879]: https://github.com/rust-lang/rust/pull/81879
1459 [82261]: https://github.com/rust-lang/rust/pull/82261
1460 [82218]: https://github.com/rust-lang/rust/pull/82218
1461 [82216]: https://github.com/rust-lang/rust/pull/82216
1462 [82202]: https://github.com/rust-lang/rust/pull/82202
1463 [81855]: https://github.com/rust-lang/rust/pull/81855
1464 [81766]: https://github.com/rust-lang/rust/pull/81766
1465 [81744]: https://github.com/rust-lang/rust/pull/81744
1466 [81611]: https://github.com/rust-lang/rust/pull/81611
1467 [81479]: https://github.com/rust-lang/rust/pull/81479
1468 [81451]: https://github.com/rust-lang/rust/pull/81451
1469 [81356]: https://github.com/rust-lang/rust/pull/81356
1470 [80962]: https://github.com/rust-lang/rust/pull/80962
1471 [80553]: https://github.com/rust-lang/rust/pull/80553
1472 [80527]: https://github.com/rust-lang/rust/pull/80527
1473 [79519]: https://github.com/rust-lang/rust/pull/79519
1474 [79423]: https://github.com/rust-lang/rust/pull/79423
1475 [79208]: https://github.com/rust-lang/rust/pull/79208
1476 [78429]: https://github.com/rust-lang/rust/pull/78429
1477 [82733]: https://github.com/rust-lang/rust/pull/82733
1478 [82594]: https://github.com/rust-lang/rust/pull/82594
1479 [79078]: https://github.com/rust-lang/rust/pull/79078
1480 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1481 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1482 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1483 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1484 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1485 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1486 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1487 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1488 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1489 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1490 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1491 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1492 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1493 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1494 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1495 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1496 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1497 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1498 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1499 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1500 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1501 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1503 Version 1.51.0 (2021-03-25)
1504 ============================
1508 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1509 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1510 E.g. you can now write the following. Note: Only values of primitive integers,
1511 `bool`, or `char` types are currently permitted.
1513 struct GenericArray<T, const LENGTH: usize> {
1517 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1518 const fn last(&self) -> Option<&T> {
1522 Some(&self.inner[LENGTH - 1])
1532 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1533 This option controls whether debug information is split across multiple files
1534 or packed into a single file. **Note** This option is unstable on other platforms.
1535 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1536 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1537 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1538 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1540 \* Refer to Rust's [platform support page][platform-support-doc] for more
1541 information on Rust's tiered platform support.
1546 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1547 - [`str` now implements `AsMut<str>`.][80279]
1548 - [`u64` and `u128` now implement `From<char>`.][79502]
1549 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1550 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1551 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1552 - [`io::Empty` now implements `io::Seek`.][78044]
1553 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1554 `T: ?Sized` types.][80764]
1555 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1561 - [`Arc::decrement_strong_count`]
1562 - [`Arc::increment_strong_count`]
1563 - [`Once::call_once_force`]
1564 - [`Peekable::next_if_eq`]
1565 - [`Peekable::next_if`]
1566 - [`Seek::stream_position`]
1567 - [`array::IntoIter`]
1568 - [`panic::panic_any`]
1570 - [`ptr::addr_of_mut!`]
1571 - [`slice::fill_with`]
1572 - [`slice::split_inclusive_mut`]
1573 - [`slice::split_inclusive`]
1574 - [`slice::strip_prefix`]
1575 - [`slice::strip_suffix`]
1576 - [`str::split_inclusive`]
1577 - [`sync::OnceState`]
1579 - [`VecDeque::range`]
1580 - [`VecDeque::range_mut`]
1584 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1585 codegen option.][cargo/9112]
1586 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1587 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1588 to avoid unifying features of dependencies where that unification could be unwanted.
1589 Such as using the same dependency with a `std` feature in a build scripts and
1590 proc-macros, while using the `no-std` feature in the final binary. See the
1591 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1596 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1597 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1598 documentation.][79642]
1600 Various improvements to intra-doc links:
1602 - [You can link to non-path primitives such as `slice`.][80181]
1603 - [You can link to associated items.][74489]
1604 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1608 - [You can now pass `--include-ignored` to tests (e.g. with
1609 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1614 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1615 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1617 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1618 for the distributed artifacts.][81521]
1619 - `armv5te-unknown-linux-gnueabi`
1620 - `sparc64-unknown-linux-gnu`
1621 - `thumbv7neon-unknown-linux-gnueabihf`
1622 - `armv7-unknown-linux-gnueabi`
1623 - `x86_64-unknown-linux-gnux32`
1624 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1629 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1631 [79135]: https://github.com/rust-lang/rust/pull/79135
1632 [74489]: https://github.com/rust-lang/rust/pull/74489
1633 [76934]: https://github.com/rust-lang/rust/pull/76934
1634 [79570]: https://github.com/rust-lang/rust/pull/79570
1635 [80181]: https://github.com/rust-lang/rust/pull/80181
1636 [79642]: https://github.com/rust-lang/rust/pull/79642
1637 [80945]: https://github.com/rust-lang/rust/pull/80945
1638 [80279]: https://github.com/rust-lang/rust/pull/80279
1639 [80053]: https://github.com/rust-lang/rust/pull/80053
1640 [79502]: https://github.com/rust-lang/rust/pull/79502
1641 [75180]: https://github.com/rust-lang/rust/pull/75180
1642 [81521]: https://github.com/rust-lang/rust/pull/81521
1643 [80968]: https://github.com/rust-lang/rust/pull/80968
1644 [80959]: https://github.com/rust-lang/rust/pull/80959
1645 [80718]: https://github.com/rust-lang/rust/pull/80718
1646 [80653]: https://github.com/rust-lang/rust/pull/80653
1647 [80579]: https://github.com/rust-lang/rust/pull/80579
1648 [79998]: https://github.com/rust-lang/rust/pull/79998
1649 [78044]: https://github.com/rust-lang/rust/pull/78044
1650 [81455]: https://github.com/rust-lang/rust/pull/81455
1651 [80764]: https://github.com/rust-lang/rust/pull/80764
1652 [80749]: https://github.com/rust-lang/rust/pull/80749
1653 [80662]: https://github.com/rust-lang/rust/pull/80662
1654 [79134]: https://github.com/rust-lang/rust/pull/79134
1655 [80966]: https://github.com/rust-lang/rust/pull/80966
1656 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1657 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1658 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1659 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1660 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1661 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1662 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1663 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1664 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1665 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1666 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1667 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1668 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1669 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1670 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1671 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1672 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1673 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1674 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1675 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1676 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1677 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1678 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1680 Version 1.50.0 (2021-02-11)
1681 ============================
1684 -----------------------
1685 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1686 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1687 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1690 -----------------------
1691 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1692 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1693 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1694 - [Dropped support for all cloudabi targets.][78439]
1696 \* Refer to Rust's [platform support page][platform-support-doc] for more
1697 information on Rust's tiered platform support.
1700 -----------------------
1702 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1703 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1704 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1705 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1706 up the same amount of space as `File`.
1712 - [`btree_map::Entry::or_insert_with_key`]
1715 - [`hash_map::Entry::or_insert_with_key`]
1719 - [`UnsafeCell::get_mut`]
1721 The following previously stable methods are now `const`.
1723 - [`IpAddr::is_ipv4`]
1724 - [`IpAddr::is_ipv6`]
1725 - [`IpAddr::is_unspecified`]
1726 - [`IpAddr::is_loopback`]
1727 - [`IpAddr::is_multicast`]
1728 - [`Ipv4Addr::octets`]
1729 - [`Ipv4Addr::is_loopback`]
1730 - [`Ipv4Addr::is_private`]
1731 - [`Ipv4Addr::is_link_local`]
1732 - [`Ipv4Addr::is_multicast`]
1733 - [`Ipv4Addr::is_broadcast`]
1734 - [`Ipv4Addr::is_documentation`]
1735 - [`Ipv4Addr::to_ipv6_compatible`]
1736 - [`Ipv4Addr::to_ipv6_mapped`]
1737 - [`Ipv6Addr::segments`]
1738 - [`Ipv6Addr::is_unspecified`]
1739 - [`Ipv6Addr::is_loopback`]
1740 - [`Ipv6Addr::is_multicast`]
1741 - [`Ipv6Addr::to_ipv4`]
1744 - [`Layout::from_size_align`]
1745 - `pow` for all integer types.
1746 - `checked_pow` for all integer types.
1747 - `saturating_pow` for all integer types.
1748 - `wrapping_pow` for all integer types.
1749 - `next_power_of_two` for all unsigned integer types.
1750 - `checked_next_power_of_two` for all unsigned integer types.
1753 -----------------------
1755 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1756 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1757 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1758 contents of that directory for changes.][cargo/8973]
1759 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1764 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1765 - [Running tests will now print the total time taken to execute.][75752]
1770 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1771 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1772 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1773 unhygenic `macro_rules!` macros.][79472]
1774 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1775 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1776 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1777 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1778 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1779 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1781 [74989]: https://github.com/rust-lang/rust/pull/74989
1782 [79261]: https://github.com/rust-lang/rust/pull/79261
1783 [79896]: https://github.com/rust-lang/rust/pull/79896
1784 [79484]: https://github.com/rust-lang/rust/pull/79484
1785 [79472]: https://github.com/rust-lang/rust/pull/79472
1786 [79270]: https://github.com/rust-lang/rust/pull/79270
1787 [79003]: https://github.com/rust-lang/rust/pull/79003
1788 [78864]: https://github.com/rust-lang/rust/pull/78864
1789 [78636]: https://github.com/rust-lang/rust/pull/78636
1790 [78439]: https://github.com/rust-lang/rust/pull/78439
1791 [78343]: https://github.com/rust-lang/rust/pull/78343
1792 [78296]: https://github.com/rust-lang/rust/pull/78296
1793 [78068]: https://github.com/rust-lang/rust/pull/78068
1794 [75752]: https://github.com/rust-lang/rust/pull/75752
1795 [74699]: https://github.com/rust-lang/rust/pull/74699
1796 [78142]: https://github.com/rust-lang/rust/pull/78142
1797 [77484]: https://github.com/rust-lang/rust/pull/77484
1798 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1799 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1800 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1801 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1802 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1803 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1804 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1805 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1806 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1807 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1808 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1809 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1810 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1811 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1812 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1813 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1814 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1815 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1816 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1817 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1818 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1819 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1820 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1821 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1822 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1823 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1824 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1825 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1826 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1827 [`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
1828 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1829 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1830 [`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
1831 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1834 Version 1.49.0 (2020-12-31)
1835 ============================
1838 -----------------------
1840 - [Unions can now implement `Drop`, and you can now have a field in a union
1841 with `ManuallyDrop<T>`.][77547]
1842 - [You can now cast uninhabited enums to integers.][76199]
1843 - [You can now bind by reference and by move in patterns.][76119] This
1844 allows you to selectively borrow individual components of a type. E.g.
1852 let person = Person {
1853 name: String::from("Alice"),
1857 // `name` is moved out of person, but `age` is referenced.
1858 let Person { name, ref age } = person;
1859 println!("{} {}", name, age);
1863 -----------------------
1865 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1866 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1867 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1868 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1869 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1870 - [Output from threads spawned in tests is now captured.][78227]
1871 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1873 \* Refer to Rust's [platform support page][platform-support-doc] for more
1874 information on Rust's tiered platform support.
1877 -----------------------
1879 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1880 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1885 - [`slice::select_nth_unstable`]
1886 - [`slice::select_nth_unstable_by`]
1887 - [`slice::select_nth_unstable_by_key`]
1889 The following previously stable methods are now `const`.
1891 - [`Poll::is_ready`]
1892 - [`Poll::is_pending`]
1895 -----------------------
1896 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1897 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1898 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1899 variable will be set if the crate being built is one the user selected to build, either
1900 with `-p` or through defaults.
1901 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1907 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1908 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1909 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1910 Previously such invalid or unused attributes could be ignored.
1911 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1912 read [this post about the changes][rustdoc-ws-post] for more details.
1913 - [Trait bounds are no longer inferred for associated types.][79904]
1917 These changes provide no direct user facing benefits, but represent significant
1918 improvements to the internals and overall performance of rustc and
1921 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1922 Local Storage model.][78201]
1923 - [Calculate visibilities once in resolve.][78077]
1924 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1925 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1928 [75991]: https://github.com/rust-lang/rust/pull/75991
1929 [78951]: https://github.com/rust-lang/rust/pull/78951
1930 [78848]: https://github.com/rust-lang/rust/pull/78848
1931 [78746]: https://github.com/rust-lang/rust/pull/78746
1932 [78376]: https://github.com/rust-lang/rust/pull/78376
1933 [78228]: https://github.com/rust-lang/rust/pull/78228
1934 [78227]: https://github.com/rust-lang/rust/pull/78227
1935 [78201]: https://github.com/rust-lang/rust/pull/78201
1936 [78109]: https://github.com/rust-lang/rust/pull/78109
1937 [78077]: https://github.com/rust-lang/rust/pull/78077
1938 [77997]: https://github.com/rust-lang/rust/pull/77997
1939 [77703]: https://github.com/rust-lang/rust/pull/77703
1940 [77547]: https://github.com/rust-lang/rust/pull/77547
1941 [77015]: https://github.com/rust-lang/rust/pull/77015
1942 [76199]: https://github.com/rust-lang/rust/pull/76199
1943 [76119]: https://github.com/rust-lang/rust/pull/76119
1944 [75914]: https://github.com/rust-lang/rust/pull/75914
1945 [79004]: https://github.com/rust-lang/rust/pull/79004
1946 [78676]: https://github.com/rust-lang/rust/pull/78676
1947 [79904]: https://github.com/rust-lang/rust/issues/79904
1948 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1949 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1950 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1951 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1952 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1953 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1954 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1955 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1956 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1957 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1959 Version 1.48.0 (2020-11-19)
1960 ==========================
1965 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1966 is still rejected *semantically*, but can now be parsed by procedural macros.
1970 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1971 `rustc` whether to link its own C runtime and libraries or to rely on a external
1972 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1973 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1974 Note: If you're using cargo you must explicitly pass the `--target` flag.
1975 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1977 \* Refer to Rust's [platform support page][platform-support-doc] for more
1978 information on Rust's tiered platform support.
1982 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1983 and `&Stderr`.][76275]
1984 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1985 - [The `matches!` macro now supports having a trailing comma.][74880]
1986 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1987 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1991 - [`slice::as_ptr_range`]
1992 - [`slice::as_mut_ptr_range`]
1993 - [`VecDeque::make_contiguous`]
1994 - [`future::pending`]
1997 The following previously stable methods are now `const fn`'s:
1999 - [`Option::is_some`]
2000 - [`Option::is_none`]
2001 - [`Option::as_ref`]
2003 - [`Result::is_err`]
2004 - [`Result::as_ref`]
2005 - [`Ordering::reverse`]
2006 - [`Ordering::then`]
2013 - [You can now link to items in `rustdoc` using the intra-doc link
2014 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2015 a link to `std::future`'s documentation. See ["Linking to items by
2016 name"][intradoc-links] for more information.
2017 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2018 when searching through `rustdoc`'s UI.][75740]
2022 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2023 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2024 promoted to `'static` lifetime any more inside `const fn`s.
2025 - [Associated type bindings on trait objects are now verified to meet the bounds
2026 declared on the trait when checking that they implement the trait.][27675]
2027 - [When trait bounds on associated types or opaque types are ambiguous, the
2028 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2029 - [Fixed recursive nonterminals not being expanded in macros during
2030 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2031 correctly handling recursive nonterminal tokens.
2032 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2033 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2034 in places where they have no effect.][73461]
2035 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2036 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2037 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2038 disallow zero-initialization.][71274]
2039 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2040 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2041 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2042 see the [`catch_unwind`] documentation for further information.
2048 These changes provide no direct user facing benefits, but represent significant
2049 improvements to the internals and overall performance of rustc and
2052 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2053 You can continue building with `make` by setting `ninja=false` in
2055 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2056 - [Made `ensure_sufficient_stack()` non-generic][76680]
2058 [78143]: https://github.com/rust-lang/rust/issues/78143
2059 [76680]: https://github.com/rust-lang/rust/pull/76680/
2060 [76030]: https://github.com/rust-lang/rust/pull/76030/
2061 [70212]: https://github.com/rust-lang/rust/pull/70212/
2062 [27675]: https://github.com/rust-lang/rust/issues/27675/
2063 [54121]: https://github.com/rust-lang/rust/issues/54121/
2064 [71274]: https://github.com/rust-lang/rust/pull/71274/
2065 [77386]: https://github.com/rust-lang/rust/pull/77386/
2066 [77153]: https://github.com/rust-lang/rust/pull/77153/
2067 [77055]: https://github.com/rust-lang/rust/pull/77055/
2068 [76275]: https://github.com/rust-lang/rust/pull/76275/
2069 [76310]: https://github.com/rust-lang/rust/pull/76310/
2070 [76420]: https://github.com/rust-lang/rust/pull/76420/
2071 [76158]: https://github.com/rust-lang/rust/pull/76158/
2072 [75857]: https://github.com/rust-lang/rust/pull/75857/
2073 [75585]: https://github.com/rust-lang/rust/pull/75585/
2074 [75740]: https://github.com/rust-lang/rust/pull/75740/
2075 [75502]: https://github.com/rust-lang/rust/pull/75502/
2076 [74880]: https://github.com/rust-lang/rust/pull/74880/
2077 [74922]: https://github.com/rust-lang/rust/pull/74922/
2078 [74430]: https://github.com/rust-lang/rust/pull/74430/
2079 [74194]: https://github.com/rust-lang/rust/pull/74194/
2080 [73461]: https://github.com/rust-lang/rust/pull/73461/
2081 [73166]: https://github.com/rust-lang/rust/pull/73166/
2082 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2083 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2084 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2085 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2086 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2087 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2088 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2089 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2090 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2091 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2092 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2093 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2094 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2095 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2096 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2099 Version 1.47.0 (2020-10-08)
2100 ==========================
2104 - [Closures will now warn when not used.][74869]
2108 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2109 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2111 - [Upgraded to LLVM 11.][73526]
2112 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2113 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2114 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2116 \* Refer to Rust's [platform support page][platform-support-doc] for more
2117 information on Rust's tiered platform support.
2121 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2122 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2123 those of length less than 33.][74060]
2124 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2125 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2126 `PartialEq`, and `PartialOrd`.][73583]
2130 - [`Ident::new_raw`]
2131 - [`Range::is_empty`]
2132 - [`RangeInclusive::is_empty`]
2133 - [`Result::as_deref`]
2134 - [`Result::as_deref_mut`]
2136 - [`pointer::offset_from`]
2140 The following previously stable APIs have now been made const.
2142 - [The `new` method for all `NonZero` integers.][73858]
2143 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2144 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2145 methods for all integers.][73858]
2146 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2147 signed integers.][73858]
2148 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2149 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2150 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2151 `is_ascii_control` methods for `char` and `u8`.][73858]
2155 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2156 You can override this by setting the following in your `Cargo.toml`.
2158 [profile.release.build-override]
2161 - [`cargo-help` will now display man pages for commands rather just the
2162 `--help` text.][cargo/8456]
2163 - [`cargo-metadata` now emits a `test` field indicating if a target has
2164 tests enabled.][cargo/8478]
2165 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2166 - [`cargo-publish` will now use an alternative registry by default if it's the
2167 only registry specified in `package.publish`.][cargo/8571]
2171 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2172 type based search.][75366]
2173 - [Added the Ayu theme to rustdoc.][71237]
2177 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2178 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2179 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2180 help to preserve more span information.][73084] These changes may cause
2181 compiliation errors if your macro was unhygenic or didn't correctly handle
2183 - [Moved support for the CloudABI target to tier 3.][75568]
2184 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2185 - [Added the `rustc-docs` component.][75560] This allows you to install
2186 and read the documentation for the compiler internal APIs. (Currently only
2187 available for `x86_64-unknown-linux-gnu`.)
2192 - [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.
2194 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2195 [75048]: https://github.com/rust-lang/rust/pull/75048/
2196 [74163]: https://github.com/rust-lang/rust/pull/74163/
2197 [71237]: https://github.com/rust-lang/rust/pull/71237/
2198 [74869]: https://github.com/rust-lang/rust/pull/74869/
2199 [73858]: https://github.com/rust-lang/rust/pull/73858/
2200 [75716]: https://github.com/rust-lang/rust/pull/75716/
2201 [75560]: https://github.com/rust-lang/rust/pull/75560/
2202 [75568]: https://github.com/rust-lang/rust/pull/75568/
2203 [75366]: https://github.com/rust-lang/rust/pull/75366/
2204 [75204]: https://github.com/rust-lang/rust/pull/75204/
2205 [74650]: https://github.com/rust-lang/rust/pull/74650/
2206 [74419]: https://github.com/rust-lang/rust/pull/74419/
2207 [73964]: https://github.com/rust-lang/rust/pull/73964/
2208 [74021]: https://github.com/rust-lang/rust/pull/74021/
2209 [74060]: https://github.com/rust-lang/rust/pull/74060/
2210 [73893]: https://github.com/rust-lang/rust/pull/73893/
2211 [73526]: https://github.com/rust-lang/rust/pull/73526/
2212 [73583]: https://github.com/rust-lang/rust/pull/73583/
2213 [73084]: https://github.com/rust-lang/rust/pull/73084/
2214 [73197]: https://github.com/rust-lang/rust/pull/73197/
2215 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2216 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2217 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2218 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2219 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2220 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2221 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2222 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2223 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2224 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2225 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2226 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2227 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2228 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2231 Version 1.46.0 (2020-08-27)
2232 ==========================
2236 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2237 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2238 const functions.][73862]
2239 - [The `#[track_caller]` attribute can now be added to functions to use the
2240 function's caller's location information for panic messages.][72445]
2241 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2242 `x.0.0` over `(x.0).0`.
2243 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2244 You currently can't use `mem::transmute` in constant functions.
2248 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2249 - [Enabled static "Position Independent Executables" by default
2250 for `x86_64-unknown-linux-musl`.][70740]
2254 - [`mem::forget` is now a `const fn`.][73887]
2255 - [`String` now implements `From<char>`.][73466]
2256 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2257 integer types.][73032]
2258 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2259 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2260 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2261 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2262 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2263 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2268 - [`vec::Drain::as_slice`]
2272 Added a number of new environment variables that are now available when
2273 compiling your crate.
2275 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2276 the specific binary being compiled and the name of the crate.
2277 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2278 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2282 - [The target configuration option `abi_blacklist` has been renamed
2283 to `unsupported_abis`.][74150] The old name will still continue to work.
2284 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2285 This was previously accepted but will become a hard error in a future release.
2286 - [Rustc will fail to compile if you have a struct with
2287 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2289 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2290 ensure that spans have the correct information, and may cause breakage if you
2291 were relying on receiving spans with dummy information.
2292 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2293 a legacy installer that was replaced by a MSI installer a few years ago but
2294 was still being built.
2295 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2296 - [Rustc will no longer accept overlapping trait implementations that only
2297 differ in how the lifetime was bound.][72493]
2298 - [Rustc now correctly relates the lifetime of an existential associated
2299 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2300 you to pass a shorter lifetime than expected.
2301 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2302 The library will need to be installed for `rustc` to work, even though we
2303 expect it to be already available on most systems.
2304 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2306 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2307 exact output returned by rustc's pretty printing is an unstable
2308 implementation detail: we recommend any macro relying on it to switch to a
2309 more robust parsing system.
2311 [75453]: https://github.com/rust-lang/rust/issues/75453/
2312 [74820]: https://github.com/rust-lang/rust/issues/74820/
2313 [74420]: https://github.com/rust-lang/rust/issues/74420/
2314 [74109]: https://github.com/rust-lang/rust/pull/74109/
2315 [74150]: https://github.com/rust-lang/rust/pull/74150/
2316 [73862]: https://github.com/rust-lang/rust/pull/73862/
2317 [73887]: https://github.com/rust-lang/rust/pull/73887/
2318 [73466]: https://github.com/rust-lang/rust/pull/73466/
2319 [73516]: https://github.com/rust-lang/rust/pull/73516/
2320 [73293]: https://github.com/rust-lang/rust/pull/73293/
2321 [73007]: https://github.com/rust-lang/rust/pull/73007/
2322 [73032]: https://github.com/rust-lang/rust/pull/73032/
2323 [72920]: https://github.com/rust-lang/rust/pull/72920/
2324 [72569]: https://github.com/rust-lang/rust/pull/72569/
2325 [72583]: https://github.com/rust-lang/rust/pull/72583/
2326 [72584]: https://github.com/rust-lang/rust/pull/72584/
2327 [72717]: https://github.com/rust-lang/rust/pull/72717/
2328 [72437]: https://github.com/rust-lang/rust/pull/72437/
2329 [72445]: https://github.com/rust-lang/rust/pull/72445/
2330 [72486]: https://github.com/rust-lang/rust/pull/72486/
2331 [72493]: https://github.com/rust-lang/rust/pull/72493/
2332 [72331]: https://github.com/rust-lang/rust/pull/72331/
2333 [71896]: https://github.com/rust-lang/rust/pull/71896/
2334 [71660]: https://github.com/rust-lang/rust/pull/71660/
2335 [71322]: https://github.com/rust-lang/rust/pull/71322/
2336 [70740]: https://github.com/rust-lang/rust/pull/70740/
2337 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2338 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2339 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2340 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2341 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2344 Version 1.45.2 (2020-08-03)
2345 ==========================
2347 * [Fix bindings in tuple struct patterns][74954]
2348 * [Fix track_caller integration with trait objects][74784]
2350 [74954]: https://github.com/rust-lang/rust/issues/74954
2351 [74784]: https://github.com/rust-lang/rust/issues/74784
2354 Version 1.45.1 (2020-07-30)
2355 ==========================
2357 * [Fix const propagation with references.][73613]
2358 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2359 * [Avoid spurious implicit region bound.][74509]
2360 * [Install clippy on x.py install][74457]
2362 [73613]: https://github.com/rust-lang/rust/pull/73613
2363 [73078]: https://github.com/rust-lang/rust/issues/73078
2364 [74509]: https://github.com/rust-lang/rust/pull/74509
2365 [74457]: https://github.com/rust-lang/rust/pull/74457
2368 Version 1.45.0 (2020-07-16)
2369 ==========================
2373 - [Out of range float to int conversions using `as` has been defined as a saturating
2374 conversion.][71269] This was previously undefined behaviour, but you can use the
2375 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2376 may be desirable in rare performance sensitive situations.
2377 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2378 using `u64`.][70705]
2379 - [Function like procedural macros can now be used in expression, pattern, and statement
2380 positions.][68717] This means you can now use a function-like procedural macro
2381 anywhere you can use a declarative (`macro_rules!`) macro.
2385 - [You can now override individual target features through the `target-feature`
2386 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2387 equivalent to `-C target-feature=+avx2,+fma`.
2388 - [Added the `force-unwind-tables` flag.][69984] This option allows
2389 rustc to always generate unwind tables regardless of panic strategy.
2390 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2391 to include LLVM bitcode into generated `rlib`s (this is on by default).
2392 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2393 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2394 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2395 - [Upgraded to LLVM 10.][67759]
2397 \* Refer to Rust's [platform support page][platform-support-doc] for more
2398 information on Rust's tiered platform support.
2403 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2405 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2406 - [You can now use `char` with
2407 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2408 a range of codepoints.][72413] E.g.
2409 you can now write the following;
2411 for ch in 'a'..='z' {
2415 // Prints "abcdefghijklmnopqrstuvwxyz"
2417 - [`OsString` now implements `FromStr`.][71662]
2418 - [The `saturating_neg` method has been added to all signed integer primitive
2419 types, and the `saturating_abs` method has been added for all integer
2420 primitive types.][71886]
2421 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2422 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2424 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2425 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2426 integer types.][69813]
2427 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2428 integer types.][72324]
2429 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2434 - [`BTreeMap::remove_entry`]
2436 - [`rc::Weak::as_ptr`]
2437 - [`rc::Weak::from_raw`]
2438 - [`rc::Weak::into_raw`]
2439 - [`str::strip_prefix`]
2440 - [`str::strip_suffix`]
2441 - [`sync::Weak::as_ptr`]
2442 - [`sync::Weak::from_raw`]
2443 - [`sync::Weak::into_raw`]
2444 - [`char::UNICODE_VERSION`]
2445 - [`Span::resolved_at`]
2446 - [`Span::located_at`]
2447 - [`Span::mixed_site`]
2448 - [`unix::process::CommandExt::arg0`]
2453 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2458 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2459 `~~outdated information~~` becomes "~~outdated information~~".
2460 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2464 - [Trying to self initialize a static value (that is creating a value using
2465 itself) is unsound and now causes a compile error.][71140]
2466 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2467 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2468 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2469 previously undocumented and not intended for public use. Rustdoc still provides
2470 a non-zero exit code on errors.
2471 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2472 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2473 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2474 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2475 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2479 - [Make clippy a git subtree instead of a git submodule][70655]
2480 - [Unify the undo log of all snapshot types][69464]
2482 [71848]: https://github.com/rust-lang/rust/issues/71848/
2483 [73420]: https://github.com/rust-lang/rust/issues/73420/
2484 [72324]: https://github.com/rust-lang/rust/pull/72324/
2485 [71843]: https://github.com/rust-lang/rust/pull/71843/
2486 [71886]: https://github.com/rust-lang/rust/pull/71886/
2487 [72234]: https://github.com/rust-lang/rust/pull/72234/
2488 [72239]: https://github.com/rust-lang/rust/pull/72239/
2489 [72397]: https://github.com/rust-lang/rust/pull/72397/
2490 [72413]: https://github.com/rust-lang/rust/pull/72413/
2491 [72014]: https://github.com/rust-lang/rust/pull/72014/
2492 [72062]: https://github.com/rust-lang/rust/pull/72062/
2493 [72094]: https://github.com/rust-lang/rust/pull/72094/
2494 [72133]: https://github.com/rust-lang/rust/pull/72133/
2495 [67759]: https://github.com/rust-lang/rust/pull/67759/
2496 [71900]: https://github.com/rust-lang/rust/pull/71900/
2497 [71928]: https://github.com/rust-lang/rust/pull/71928/
2498 [71662]: https://github.com/rust-lang/rust/pull/71662/
2499 [71716]: https://github.com/rust-lang/rust/pull/71716/
2500 [71447]: https://github.com/rust-lang/rust/pull/71447/
2501 [71269]: https://github.com/rust-lang/rust/pull/71269/
2502 [71095]: https://github.com/rust-lang/rust/pull/71095/
2503 [71140]: https://github.com/rust-lang/rust/pull/71140/
2504 [70655]: https://github.com/rust-lang/rust/pull/70655/
2505 [70705]: https://github.com/rust-lang/rust/pull/70705/
2506 [69984]: https://github.com/rust-lang/rust/pull/69984/
2507 [69813]: https://github.com/rust-lang/rust/pull/69813/
2508 [69464]: https://github.com/rust-lang/rust/pull/69464/
2509 [68717]: https://github.com/rust-lang/rust/pull/68717/
2510 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2511 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2512 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2513 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2514 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2515 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2516 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2517 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2518 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2519 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2520 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2521 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2522 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2523 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2524 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2525 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2526 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2529 Version 1.44.1 (2020-06-18)
2530 ===========================
2532 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2533 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2534 * [Fix crashes when finding backtrace on macOS.][71397]
2535 * [Clippy applies lint levels into different files.][clippy/5356]
2537 [71397]: https://github.com/rust-lang/rust/issues/71397
2538 [73078]: https://github.com/rust-lang/rust/issues/73078
2539 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2540 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2543 Version 1.44.0 (2020-06-04)
2544 ==========================
2548 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2549 - [Added the `unused_braces` lint.][70081]
2551 **Syntax-only changes**
2553 - [Expansion-driven outline module parsing][69838]
2558 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2563 These are still rejected semantically, so you will likely receive an error but
2564 these changes can be seen and parsed by macros and conditional compilation.
2568 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2569 Additionally when in incremental mode rustc defaults to 256 codegen units.
2570 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2571 a panic is thrown.][67502]
2572 - [Added tier 3\* support for the `aarch64-unknown-none` and
2573 `aarch64-unknown-none-softfloat` targets.][68334]
2574 - [Added tier 3 support for `arm64-apple-tvos` and
2575 `x86_64-apple-tvos` targets.][68191]
2580 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2581 `vec![]` to be able to be used in `const` contexts.
2582 - [`convert::Infallible` now implements `Hash`.][70281]
2583 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2584 a `&mut OsStr`.][70048]
2585 - [Unicode 13 is now supported.][69929]
2586 - [`String` now implements `From<&mut str>`.][69661]
2587 - [`IoSlice` now implements `Copy`.][69403]
2588 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2589 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2590 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2591 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2592 integer types.][69373]
2596 - [`PathBuf::with_capacity`]
2597 - [`PathBuf::capacity`]
2598 - [`PathBuf::clear`]
2599 - [`PathBuf::reserve`]
2600 - [`PathBuf::reserve_exact`]
2601 - [`PathBuf::shrink_to_fit`]
2602 - [`f32::to_int_unchecked`]
2603 - [`f64::to_int_unchecked`]
2604 - [`Layout::align_to`]
2605 - [`Layout::pad_to_align`]
2607 - [`Layout::extend`]
2611 - [Added the `cargo tree` command which will print a tree graph of
2612 your dependencies.][cargo/8062] E.g.
2614 mdbook v0.3.2 (/Users/src/rust/mdbook)
2616 │ ├── html5ever v0.24.0
2618 │ │ │ └── cfg-if v0.1.9
2620 │ │ └── markup5ever v0.9.0
2621 │ │ ├── log v0.4.8 (*)
2623 │ │ │ └── phf_shared v0.7.24
2624 │ │ │ ├── siphasher v0.2.3
2625 │ │ │ └── unicase v1.4.2
2626 │ │ │ [build-dependencies]
2627 │ │ │ └── version_check v0.1.5
2630 You can also display dependencies on multiple versions of the same crate with
2631 `cargo tree -d` (short for `cargo tree --duplicates`).
2635 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2636 the version in the sidebar.][69494]
2640 - [Rustc now correctly generates static libraries on Windows GNU targets with
2641 the `.a` extension, rather than the previous `.lib`.][70937]
2642 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2643 - [The `file_name` property in JSON output of macro errors now points the actual
2644 source file rather than the previous format of `<NAME macros>`.][70969]
2645 **Note:** this may not point to a file that actually exists on the user's system.
2646 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2647 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2648 not allow zero initialization such as `NonZeroU8`.][66059] This was
2649 previously a warning.
2650 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2651 operator has been defined as a saturating operation.][71269] This was previously
2652 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2653 continue using the current behaviour, which may be desirable in rare performance
2654 sensitive situations.
2658 These changes provide no direct user facing benefits, but represent significant
2659 improvements to the internals and overall performance of rustc and
2662 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2663 - [Replace big JS dict with JSON parsing.][71250]
2665 [69373]: https://github.com/rust-lang/rust/pull/69373/
2666 [66059]: https://github.com/rust-lang/rust/pull/66059/
2667 [68191]: https://github.com/rust-lang/rust/pull/68191/
2668 [68899]: https://github.com/rust-lang/rust/pull/68899/
2669 [71147]: https://github.com/rust-lang/rust/pull/71147/
2670 [71250]: https://github.com/rust-lang/rust/pull/71250/
2671 [70937]: https://github.com/rust-lang/rust/pull/70937/
2672 [70969]: https://github.com/rust-lang/rust/pull/70969/
2673 [70632]: https://github.com/rust-lang/rust/pull/70632/
2674 [70281]: https://github.com/rust-lang/rust/pull/70281/
2675 [70345]: https://github.com/rust-lang/rust/pull/70345/
2676 [70048]: https://github.com/rust-lang/rust/pull/70048/
2677 [70081]: https://github.com/rust-lang/rust/pull/70081/
2678 [70156]: https://github.com/rust-lang/rust/pull/70156/
2679 [71269]: https://github.com/rust-lang/rust/pull/71269/
2680 [69838]: https://github.com/rust-lang/rust/pull/69838/
2681 [69929]: https://github.com/rust-lang/rust/pull/69929/
2682 [69661]: https://github.com/rust-lang/rust/pull/69661/
2683 [69778]: https://github.com/rust-lang/rust/pull/69778/
2684 [69494]: https://github.com/rust-lang/rust/pull/69494/
2685 [69403]: https://github.com/rust-lang/rust/pull/69403/
2686 [69033]: https://github.com/rust-lang/rust/pull/69033/
2687 [68692]: https://github.com/rust-lang/rust/pull/68692/
2688 [68334]: https://github.com/rust-lang/rust/pull/68334/
2689 [67502]: https://github.com/rust-lang/rust/pull/67502/
2690 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2691 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2692 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2693 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2694 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2695 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2696 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2697 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2698 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2699 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2700 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2701 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2702 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2705 Version 1.43.1 (2020-05-07)
2706 ===========================
2708 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2709 * [Fixed the stabilization of AVX-512 features.][71473]
2710 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2712 [71430]: https://github.com/rust-lang/rust/pull/71430
2713 [71473]: https://github.com/rust-lang/rust/issues/71473
2714 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2717 Version 1.43.0 (2020-04-23)
2718 ==========================
2722 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2723 the type inferred correctly.][68129]
2724 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2726 **Syntax only changes**
2727 - [Allow `type Foo: Ord` syntactically.][69361]
2728 - [Fuse associated and extern items up to defaultness.][69194]
2729 - [Syntactically allow `self` in all `fn` contexts.][68764]
2730 - [Merge `fn` syntax + cleanup item parsing.][68728]
2731 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2732 For example, you may now write:
2734 macro_rules! mac_trait {
2744 These are still rejected *semantically*, so you will likely receive an error but
2745 these changes can be seen and parsed by macros and
2746 conditional compilation.
2751 - [You can now pass multiple lint flags to rustc to override the previous
2752 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2753 everything in the `unused` lint group except `unused-variables` which
2754 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2755 everything in the `unused` lint group **including** `unused-variables` since
2756 the allow flag is specified before the deny flag (and therefore overridden).
2757 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2758 if they are available on `windows-gnu`.][67429]
2759 - [rustc now buffers errors/warnings printed in JSON.][69227]
2763 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2764 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2765 respectively.][69538] **Note** These conversions are only available when `N`
2767 - [You can now use associated constants on floats and integers directly, rather
2768 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2769 `f32::NAN` with no imports.
2770 - [`u8::is_ascii` is now `const`.][68984]
2771 - [`String` now implements `AsMut<str>`.][68742]
2772 - [Added the `primitive` module to `std` and `core`.][67637] This module
2773 reexports Rust's primitive types. This is mainly useful in macros
2774 where you want avoid these types being shadowed.
2775 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2776 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2780 - [`Once::is_completed`]
2785 - [`iter::once_with`]
2789 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2790 your environment.][cargo/7823]
2791 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2792 executable path when running integration tests or benchmarks.][cargo/7697]
2793 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2794 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2798 - [Certain checks in the `const_err` lint were deemed unrelated to const
2799 evaluation][69185], and have been moved to the `unconditional_panic` and
2800 `arithmetic_overflow` lints.
2805 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2806 has been a warning since 1.36.0.
2807 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2808 led to some instances being accepted, and now correctly emits a hard error.
2810 [69340]: https://github.com/rust-lang/rust/pull/69340
2814 These changes provide no direct user facing benefits, but represent significant
2815 improvements to the internals and overall performance of `rustc` and
2818 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2819 - [Improved how rustc generates drop code.][67332]
2820 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2821 - [traits: preallocate 2 Vecs of known initial size][69022]
2822 - [Avoid exponential behaviour when relating types][68772]
2823 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2824 - [Improve performance of coherence checks][68966]
2825 - [Deduplicate types in the generator witness][68672]
2826 - [Invert control in struct_lint_level.][68725]
2828 [67332]: https://github.com/rust-lang/rust/pull/67332/
2829 [67429]: https://github.com/rust-lang/rust/pull/67429/
2830 [67637]: https://github.com/rust-lang/rust/pull/67637/
2831 [67642]: https://github.com/rust-lang/rust/pull/67642/
2832 [67878]: https://github.com/rust-lang/rust/pull/67878/
2833 [67885]: https://github.com/rust-lang/rust/pull/67885/
2834 [68129]: https://github.com/rust-lang/rust/pull/68129/
2835 [68672]: https://github.com/rust-lang/rust/pull/68672/
2836 [68725]: https://github.com/rust-lang/rust/pull/68725/
2837 [68728]: https://github.com/rust-lang/rust/pull/68728/
2838 [68738]: https://github.com/rust-lang/rust/pull/68738/
2839 [68742]: https://github.com/rust-lang/rust/pull/68742/
2840 [68764]: https://github.com/rust-lang/rust/pull/68764/
2841 [68772]: https://github.com/rust-lang/rust/pull/68772/
2842 [68943]: https://github.com/rust-lang/rust/pull/68943/
2843 [68952]: https://github.com/rust-lang/rust/pull/68952/
2844 [68966]: https://github.com/rust-lang/rust/pull/68966/
2845 [68984]: https://github.com/rust-lang/rust/pull/68984/
2846 [69022]: https://github.com/rust-lang/rust/pull/69022/
2847 [69185]: https://github.com/rust-lang/rust/pull/69185/
2848 [69194]: https://github.com/rust-lang/rust/pull/69194/
2849 [69201]: https://github.com/rust-lang/rust/pull/69201/
2850 [69227]: https://github.com/rust-lang/rust/pull/69227/
2851 [69548]: https://github.com/rust-lang/rust/pull/69548/
2852 [69256]: https://github.com/rust-lang/rust/pull/69256/
2853 [69361]: https://github.com/rust-lang/rust/pull/69361/
2854 [69366]: https://github.com/rust-lang/rust/pull/69366/
2855 [69538]: https://github.com/rust-lang/rust/pull/69538/
2856 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2857 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2858 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2859 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2860 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2861 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2862 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2863 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2866 Version 1.42.0 (2020-03-12)
2867 ==========================
2871 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2873 fn foo(words: &[&str]) {
2875 ["Hello", "World", "!", ..] => println!("Hello World!"),
2876 ["Foo", "Bar", ..] => println!("Baz"),
2877 rest => println!("{:?}", rest),
2881 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2882 that you can create an enum that has the exact layout and ABI of the type
2884 - [You can now use outer attribute procedural macros on inline modules.][64273]
2885 - [There are some *syntax-only* changes:][67131]
2886 - `default` is syntactically allowed before items in `trait` definitions.
2887 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2888 leave out their bodies in favor of `;`.
2889 - Bounds on associated types in `impl`s are now syntactically allowed
2890 (e.g. `type Foo: Ord;`).
2891 - `...` (the C-variadic type) may occur syntactically directly as the type of
2892 any function parameter.
2894 These are still rejected *semantically*, so you will likely receive an error
2895 but these changes can be seen and parsed by procedural macros and
2896 conditional compilation.
2900 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2901 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2902 - [`Option::{expect,unwrap}` and
2903 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2904 pointing to the location where they were called, rather than
2905 `core`'s internals. ][67887]
2907 \* Refer to Rust's [platform support page][platform-support-doc] for more
2908 information on Rust's tiered platform support.
2912 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2913 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2914 to implement `Sized`.][67935]
2915 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2916 - [`Layout::new` is now `const`.][66254]
2917 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2922 - [`CondVar::wait_while`]
2923 - [`CondVar::wait_timeout_while`]
2925 - [`DebugMap::value`]
2926 - [`ManuallyDrop::take`]
2928 - [`ptr::slice_from_raw_parts_mut`]
2929 - [`ptr::slice_from_raw_parts`]
2933 - [You no longer need to include `extern crate proc_macro;` to be able to
2934 `use proc_macro;` in the `2018` edition.][cargo/7700]
2938 - [`Error::description` has been deprecated, and its use will now produce a
2939 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2941 [68253]: https://github.com/rust-lang/rust/pull/68253/
2942 [68348]: https://github.com/rust-lang/rust/pull/68348/
2943 [67935]: https://github.com/rust-lang/rust/pull/67935/
2944 [68339]: https://github.com/rust-lang/rust/pull/68339/
2945 [68122]: https://github.com/rust-lang/rust/pull/68122/
2946 [64273]: https://github.com/rust-lang/rust/pull/64273/
2947 [67712]: https://github.com/rust-lang/rust/pull/67712/
2948 [67887]: https://github.com/rust-lang/rust/pull/67887/
2949 [67131]: https://github.com/rust-lang/rust/pull/67131/
2950 [67233]: https://github.com/rust-lang/rust/pull/67233/
2951 [66899]: https://github.com/rust-lang/rust/pull/66899/
2952 [66919]: https://github.com/rust-lang/rust/pull/66919/
2953 [66254]: https://github.com/rust-lang/rust/pull/66254/
2954 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2955 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2956 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2957 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2958 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2959 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2960 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2961 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2962 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2965 Version 1.41.1 (2020-02-27)
2966 ===========================
2968 * [Always check types of static items][69145]
2969 * [Always check lifetime bounds of `Copy` impls][69145]
2970 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2972 [69225]: https://github.com/rust-lang/rust/issues/69225
2973 [69145]: https://github.com/rust-lang/rust/pull/69145
2976 Version 1.41.0 (2020-01-30)
2977 ===========================
2982 - [You can now pass type parameters to foreign items when implementing
2983 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2984 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2985 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2986 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2987 - [You can now use any valid identifier in a `format_args` macro.][66847]
2988 Previously identifiers starting with an underscore were not allowed.
2989 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2990 enum variants.][66183] These are still rejected semantically, but
2991 can be seen and parsed by procedural macros and conditional compilation.
2992 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2993 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2994 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2996 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3001 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3002 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3003 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3004 - [You can now pass an arguments file passing the `@path` syntax
3005 to rustc.][66172] Note that the format differs somewhat from what is
3006 found in other tooling; please see [the documentation][argfile-docs] for
3008 - [You can now provide `--extern` flag without a path, indicating that it is
3009 available from the search path or specified with an `-L` flag.][64882]
3011 \* Refer to Rust's [platform support page][platform-support-doc] for more
3012 information on Rust's tiered platform support.
3014 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3019 - [The `core::panic` module is now stable.][66771] It was already stable
3021 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3022 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3023 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3028 - [`Result::map_or`]
3029 - [`Result::map_or_else`]
3030 - [`std::rc::Weak::weak_count`]
3031 - [`std::rc::Weak::strong_count`]
3032 - [`std::sync::Weak::weak_count`]
3033 - [`std::sync::Weak::strong_count`]
3038 - [Cargo will now document all the private items for binary crates
3039 by default.][cargo/7593]
3040 - [`cargo-install` will now reinstall the package if it detects that it is out
3041 of date.][cargo/7560]
3042 - [Cargo.lock now uses a more git friendly format that should help to reduce
3043 merge conflicts.][cargo/7579]
3044 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3045 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3046 optimisation level to `2` for debug builds. You can also use
3047 `[profile.<profile>.build-override]` to override build scripts and
3053 - [You can now specify `edition` in documentation code blocks to compile the block
3054 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3055 should be compiled the 2018 edition of Rust.
3056 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3057 current theme with `--check-theme`.][54733]
3058 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3063 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3064 Apple targets.][apple-32bit-drop] This means that the source code is still
3065 available to build, but the targets are no longer being tested and release
3066 binaries for those platforms will no longer be distributed by the Rust project.
3067 Please refer to the linked blog post for more information.
3069 [54733]: https://github.com/rust-lang/rust/pull/54733/
3070 [61351]: https://github.com/rust-lang/rust/pull/61351/
3071 [62514]: https://github.com/rust-lang/rust/pull/62514/
3072 [67255]: https://github.com/rust-lang/rust/pull/67255/
3073 [66661]: https://github.com/rust-lang/rust/pull/66661/
3074 [66771]: https://github.com/rust-lang/rust/pull/66771/
3075 [66847]: https://github.com/rust-lang/rust/pull/66847/
3076 [66238]: https://github.com/rust-lang/rust/pull/66238/
3077 [66277]: https://github.com/rust-lang/rust/pull/66277/
3078 [66325]: https://github.com/rust-lang/rust/pull/66325/
3079 [66172]: https://github.com/rust-lang/rust/pull/66172/
3080 [66183]: https://github.com/rust-lang/rust/pull/66183/
3081 [65879]: https://github.com/rust-lang/rust/pull/65879/
3082 [65013]: https://github.com/rust-lang/rust/pull/65013/
3083 [64882]: https://github.com/rust-lang/rust/pull/64882/
3084 [64325]: https://github.com/rust-lang/rust/pull/64325/
3085 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3086 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3087 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3088 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3089 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3090 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3091 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3092 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3093 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3094 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3095 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3097 Version 1.40.0 (2019-12-19)
3098 ===========================
3102 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3103 `const` contexts.][65188] e.g.
3106 pub struct Point(i32, i32);
3108 const ORIGIN: Point = {
3109 let constructor = Point;
3115 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3116 indicate that there may be variants or fields added in the future.][64639]
3117 For example this requires adding a wild-card branch (`_ => {}`) to any match
3118 statements on a non-exhaustive `enum`. [(RFC 2008)]
3119 - [You can now use function-like procedural macros in `extern` blocks and in
3120 type positions.][63931] e.g. `type Generated = macro!();`
3121 - [Function-like and attribute procedural macros can now emit
3122 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3123 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3124 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3125 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3129 - [Added tier 3 support\* for the
3130 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3131 - [Added tier 3 support for the
3132 `aarch64-unknown-none-softfloat` target.][64589]
3133 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3134 `mips64el-unknown-linux-muslabi64` targets.][65843]
3136 \* Refer to Rust's [platform support page][platform-support-doc] for more
3137 information on Rust's tiered platform support.
3141 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3145 - [`BTreeMap::get_key_value`]
3146 - [`HashMap::get_key_value`]
3147 - [`Option::as_deref_mut`]
3148 - [`Option::as_deref`]
3149 - [`Option::flatten`]
3150 - [`UdpSocket::peer_addr`]
3151 - [`f32::to_be_bytes`]
3152 - [`f32::to_le_bytes`]
3153 - [`f32::to_ne_bytes`]
3154 - [`f64::to_be_bytes`]
3155 - [`f64::to_le_bytes`]
3156 - [`f64::to_ne_bytes`]
3157 - [`f32::from_be_bytes`]
3158 - [`f32::from_le_bytes`]
3159 - [`f32::from_ne_bytes`]
3160 - [`f64::from_be_bytes`]
3161 - [`f64::from_le_bytes`]
3162 - [`f64::from_ne_bytes`]
3169 - [Cargo will now always display warnings, rather than only on
3170 fresh builds.][cargo/7450]
3171 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3172 now produce an error.][cargo/7507] Previously these flags were ignored.
3173 - [You can now publish `dev-dependencies` without including
3174 a `version`.][cargo/7333]
3178 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3179 when running documentation tests with `rustdoc`.][63803]
3183 - [As previously announced, any previous NLL warnings in the 2015 edition are
3184 now hard errors.][64221]
3185 - [The `include!` macro will now warn if it failed to include the
3186 entire file.][64284] The `include!` macro unintentionally only includes the
3187 first _expression_ in a file, and this can be unintuitive. This will become
3188 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3189 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3190 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3191 or `extern` blocks now correctly emits a hard error.
3193 [65294]: https://github.com/rust-lang/rust/pull/65294/
3194 [66103]: https://github.com/rust-lang/rust/pull/66103/
3195 [65843]: https://github.com/rust-lang/rust/pull/65843/
3196 [65188]: https://github.com/rust-lang/rust/pull/65188/
3197 [65092]: https://github.com/rust-lang/rust/pull/65092/
3198 [64589]: https://github.com/rust-lang/rust/pull/64589/
3199 [64639]: https://github.com/rust-lang/rust/pull/64639/
3200 [64221]: https://github.com/rust-lang/rust/pull/64221/
3201 [64284]: https://github.com/rust-lang/rust/pull/64284/
3202 [63931]: https://github.com/rust-lang/rust/pull/63931/
3203 [64035]: https://github.com/rust-lang/rust/pull/64035/
3204 [63674]: https://github.com/rust-lang/rust/pull/63674/
3205 [63803]: https://github.com/rust-lang/rust/pull/63803/
3206 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3207 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3208 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3209 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3210 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3211 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3212 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3213 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3214 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3215 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3216 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3217 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3218 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3219 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3220 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3221 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3222 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3223 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3224 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3225 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3226 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3227 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3228 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3229 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3230 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3233 Version 1.39.0 (2019-11-07)
3234 ===========================
3238 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3239 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3240 - [You can now use certain attributes on function, closure, and function pointer
3241 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3242 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3243 attributes applied to items. e.g.
3246 #[cfg(windows)] slice: &[u16],
3247 #[cfg(not(windows))] slice: &[u8],
3252 - [You can now take shared references to bind-by-move patterns in the `if` guards
3253 of `match` arms.][63118] e.g.
3256 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3260 // ---- `nums` is bound by move.
3261 if nums.iter().sum::<u8>() == 10
3262 // ^------ `.iter()` implicitly takes a reference to `nums`.
3265 // ----------- Legal as `nums` was bound by move and so we have ownership.
3267 _ => unreachable!(),
3276 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3277 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3278 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3279 **Note** Cargo currently doesn't use this feature. Refer to
3280 [cargo#7315][cargo/7315] to track this feature's progress.
3281 - [You can now pass `--show-output` argument to test binaries to print the
3282 output of successful tests.][62600]
3285 \* Refer to Rust's [platform support page][platform-support-doc] for more
3286 information on Rust's tiered platform support.
3290 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3291 - [`LinkedList::new` is now a `const` function.][63684]
3292 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3293 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3294 now `const`.][63786]
3298 - [`Pin::into_inner`]
3299 - [`Instant::checked_duration_since`]
3300 - [`Instant::saturating_duration_since`]
3304 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3305 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3306 `--all` is now deprecated.
3310 - [You can now pass `-Clinker` to rustdoc to control the linker used
3311 for compiling doctests.][63834]
3315 - [Code that was previously accepted by the old borrow checker, but rejected by
3316 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3317 previously a warning, and will also become a hard error in the Rust 2015
3318 edition in the 1.40.0 release.
3319 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3320 run tests.][63827] This should improve performance when running a large
3322 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3323 recommended to use the `?` operator instead.
3324 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3327 [62600]: https://github.com/rust-lang/rust/pull/62600/
3328 [62672]: https://github.com/rust-lang/rust/pull/62672/
3329 [63118]: https://github.com/rust-lang/rust/pull/63118/
3330 [63209]: https://github.com/rust-lang/rust/pull/63209/
3331 [63402]: https://github.com/rust-lang/rust/pull/63402/
3332 [63565]: https://github.com/rust-lang/rust/pull/63565/
3333 [63595]: https://github.com/rust-lang/rust/pull/63595/
3334 [63684]: https://github.com/rust-lang/rust/pull/63684/
3335 [63698]: https://github.com/rust-lang/rust/pull/63698/
3336 [63770]: https://github.com/rust-lang/rust/pull/63770/
3337 [63786]: https://github.com/rust-lang/rust/pull/63786/
3338 [63827]: https://github.com/rust-lang/rust/pull/63827/
3339 [63834]: https://github.com/rust-lang/rust/pull/63834/
3340 [64010]: https://github.com/rust-lang/rust/pull/64010/
3341 [64028]: https://github.com/rust-lang/rust/pull/64028/
3342 [64334]: https://github.com/rust-lang/rust/pull/64334/
3343 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3344 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3345 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3346 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3347 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3348 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3350 Version 1.38.0 (2019-09-26)
3351 ==========================
3355 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3356 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3360 - [Added pipelined compilation support to `rustc`.][62766] This will
3361 improve compilation times in some cases. For further information please refer
3362 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3363 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3364 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3365 `x86_64-uwp-windows-msvc` targets.][60260]
3366 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3367 `armv7-unknown-linux-musleabi` targets.][63107]
3368 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3369 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3370 - [Upgraded to LLVM 9.][62592]
3372 \* Refer to Rust's [platform support page][platform-support-doc] for more
3373 information on Rust's tiered platform support.
3377 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3378 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3379 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3380 is available at `std::clone::Clone`). This also makes all built-in macros
3381 available in `std`/`core` root. e.g. `std::include_bytes!`.
3382 - [`str::Chars` now implements `Debug`.][63000]
3383 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3384 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3385 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3386 - [Added euclidean remainder and division operations (`div_euclid`,
3387 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3388 `overflowing`, and `wrapping` versions are available for all
3390 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3391 `PartialEq`.][61491]
3392 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3396 - [`<*const T>::cast`]
3397 - [`<*mut T>::cast`]
3398 - [`Duration::as_secs_f32`]
3399 - [`Duration::as_secs_f64`]
3400 - [`Duration::div_f32`]
3401 - [`Duration::div_f64`]
3402 - [`Duration::from_secs_f32`]
3403 - [`Duration::from_secs_f64`]
3404 - [`Duration::mul_f32`]
3405 - [`Duration::mul_f64`]
3406 - [`any::type_name`]
3410 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3411 - [You can now pass the `--features` option multiple times to enable
3412 multiple features.][cargo/7084]
3417 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3421 - [`rustc` will now warn about some incorrect uses of
3422 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3426 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3428 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3429 issues][62896] with certain crates such as libc.
3431 [60260]: https://github.com/rust-lang/rust/pull/60260/
3432 [61457]: https://github.com/rust-lang/rust/pull/61457/
3433 [61491]: https://github.com/rust-lang/rust/pull/61491/
3434 [61884]: https://github.com/rust-lang/rust/pull/61884/
3435 [61953]: https://github.com/rust-lang/rust/pull/61953/
3436 [62042]: https://github.com/rust-lang/rust/pull/62042/
3437 [62528]: https://github.com/rust-lang/rust/pull/62528/
3438 [62583]: https://github.com/rust-lang/rust/pull/62583/
3439 [62735]: https://github.com/rust-lang/rust/pull/62735/
3440 [62766]: https://github.com/rust-lang/rust/pull/62766/
3441 [62784]: https://github.com/rust-lang/rust/pull/62784/
3442 [62592]: https://github.com/rust-lang/rust/pull/62592/
3443 [62785]: https://github.com/rust-lang/rust/issues/62785/
3444 [62814]: https://github.com/rust-lang/rust/pull/62814/
3445 [62896]: https://github.com/rust-lang/rust/issues/62896/
3446 [63000]: https://github.com/rust-lang/rust/pull/63000/
3447 [63056]: https://github.com/rust-lang/rust/pull/63056/
3448 [63107]: https://github.com/rust-lang/rust/pull/63107/
3449 [63346]: https://github.com/rust-lang/rust/pull/63346/
3450 [63421]: https://github.com/rust-lang/rust/pull/63421/
3451 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3452 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3453 [63048]: https://github.com/rust-lang/rust/pull/63048
3454 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3455 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3456 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3457 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3458 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3459 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3460 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3461 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3462 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3463 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3464 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3465 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3466 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3468 Version 1.37.0 (2019-08-15)
3469 ==========================
3473 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3474 [`Box`][62228], or an [array][62235] and unused.
3475 - [You can now use the `cfg` and `cfg_attr` attributes on
3476 generic parameters.][61547]
3477 - [You can now use enum variants through type alias.][61682] e.g. You can
3478 write the following:
3480 type MyOption = Option<u8>;
3482 fn increment_or_zero(x: MyOption) -> u8 {
3484 MyOption::Some(y) => y + 1,
3485 MyOption::None => 0,
3489 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3490 `const _: u32 = 5;`.
3491 - [You can now use `#[repr(align(X)]` on enums.][61229]
3492 - [The `?` Kleene macro operator is now available in the
3493 2015 edition.][60932]
3497 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3498 and `-C profile-use` flags.][61268] For more information on how to use profile
3499 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3500 - [The `rust-lldb` wrapper script should now work again.][61827]
3504 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3508 - [`BufReader::buffer`]
3509 - [`BufWriter::buffer`]
3510 - [`Cell::from_mut`]
3511 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3512 - [`DoubleEndedIterator::nth_back`]
3514 - [`Wrapping::reverse_bits`]
3515 - [`i128::reverse_bits`]
3516 - [`i16::reverse_bits`]
3517 - [`i32::reverse_bits`]
3518 - [`i64::reverse_bits`]
3519 - [`i8::reverse_bits`]
3520 - [`isize::reverse_bits`]
3521 - [`slice::copy_within`]
3522 - [`u128::reverse_bits`]
3523 - [`u16::reverse_bits`]
3524 - [`u32::reverse_bits`]
3525 - [`u64::reverse_bits`]
3526 - [`u8::reverse_bits`]
3527 - [`usize::reverse_bits`]
3531 - [`Cargo.lock` files are now included by default when publishing executable crates
3532 with executables.][cargo/7026]
3533 - [You can now specify `default-run="foo"` in `[package]` to specify the
3534 default executable to use for `cargo run`.][cargo/7056]
3541 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3542 Please transition your code to using the `..=` syntax for inclusive
3544 - [Using a trait object without the `dyn` will now warn by default.][61203]
3545 Please transition your code to use `dyn Trait` for trait objects instead.
3547 [62228]: https://github.com/rust-lang/rust/pull/62228/
3548 [62235]: https://github.com/rust-lang/rust/pull/62235/
3549 [61802]: https://github.com/rust-lang/rust/pull/61802/
3550 [61827]: https://github.com/rust-lang/rust/pull/61827/
3551 [61547]: https://github.com/rust-lang/rust/pull/61547/
3552 [61682]: https://github.com/rust-lang/rust/pull/61682/
3553 [61268]: https://github.com/rust-lang/rust/pull/61268/
3554 [61342]: https://github.com/rust-lang/rust/pull/61342/
3555 [61347]: https://github.com/rust-lang/rust/pull/61347/
3556 [61100]: https://github.com/rust-lang/rust/pull/61100/
3557 [61203]: https://github.com/rust-lang/rust/pull/61203/
3558 [61229]: https://github.com/rust-lang/rust/pull/61229/
3559 [60932]: https://github.com/rust-lang/rust/pull/60932/
3560 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3561 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3562 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3563 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3564 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3565 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3566 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3567 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3568 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3569 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3570 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3571 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3572 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3573 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3574 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3575 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3576 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3577 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3578 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3579 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3580 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3581 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3582 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3585 Version 1.36.0 (2019-07-04)
3586 ==========================
3590 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3591 - [The order of traits in trait objects no longer affects the semantics of that
3592 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3593 `dyn fmt::Debug + Send`, where this was previously not the case.
3597 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3598 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3599 - [`mem::needs_drop` is now available as a const fn.][60364]
3600 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3601 - [`String` now implements `BorrowMut<str>`.][60404]
3602 - [`io::Cursor` now implements `Default`.][60234]
3603 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3604 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3605 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3606 environment has access to heap memory allocation.
3607 - [`String` now implements `From<&String>`.][59825]
3608 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3609 return a tuple of each argument when there is multiple arguments.
3610 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3615 - [`VecDeque::rotate_left`]
3616 - [`VecDeque::rotate_right`]
3617 - [`Iterator::copied`]
3619 - [`io::IoSliceMut`]
3620 - [`Read::read_vectored`]
3621 - [`Write::write_vectored`]
3622 - [`str::as_mut_ptr`]
3623 - [`mem::MaybeUninit`]
3624 - [`pointer::align_offset`]
3625 - [`future::Future`]
3627 - [`task::RawWaker`]
3628 - [`task::RawWakerVTable`]
3634 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3635 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3637 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3641 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3648 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3649 longer recommended, and will be deprecated in 1.39.0.
3651 [60318]: https://github.com/rust-lang/rust/pull/60318/
3652 [60364]: https://github.com/rust-lang/rust/pull/60364/
3653 [60370]: https://github.com/rust-lang/rust/pull/60370/
3654 [60404]: https://github.com/rust-lang/rust/pull/60404/
3655 [60234]: https://github.com/rust-lang/rust/pull/60234/
3656 [60244]: https://github.com/rust-lang/rust/pull/60244/
3657 [58623]: https://github.com/rust-lang/rust/pull/58623/
3658 [59648]: https://github.com/rust-lang/rust/pull/59648/
3659 [59675]: https://github.com/rust-lang/rust/pull/59675/
3660 [59825]: https://github.com/rust-lang/rust/pull/59825/
3661 [59826]: https://github.com/rust-lang/rust/pull/59826/
3662 [59445]: https://github.com/rust-lang/rust/pull/59445/
3663 [59114]: https://github.com/rust-lang/rust/pull/59114/
3664 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3665 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3666 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3667 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3668 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3669 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3670 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3671 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3672 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3673 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3674 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3675 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3676 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3677 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3678 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3679 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3680 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3681 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3682 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3683 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3686 Version 1.35.0 (2019-05-23)
3687 ==========================
3691 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3692 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3693 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3695 unsafe fn call_unsafe(func: unsafe fn()) {
3700 unsafe { call_unsafe(|| {}); }
3707 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3708 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3709 - [Added the `wasm32-unknown-wasi` target.][59464]
3714 - [`Thread` will now show its ID in `Debug` output.][59460]
3715 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3716 - [`alloc::System` now implements `Default`.][59451]
3717 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3719 - [`char::{ToLowercase, ToUppercase}` now
3720 implement `ExactSizeIterator`.][58778]
3721 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3722 - [Removed the `Read` trait bounds
3723 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3724 - [You can now call the `dbg!` macro without any parameters to print the file
3725 and line where it is called.][57847]
3726 - [In place ASCII case conversions are now up to 4× faster.][59283]
3727 e.g. `str::make_ascii_lowercase`
3728 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3735 - [`RefCell::replace_with`]
3736 - [`RefCell::map_split`]
3738 - [`Range::contains`]
3739 - [`RangeFrom::contains`]
3740 - [`RangeTo::contains`]
3741 - [`RangeInclusive::contains`]
3742 - [`RangeToInclusive::contains`]
3743 - [`Option::copied`]
3747 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3748 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3753 - [The Rust toolchain is now available natively for musl based distros.][58575]
3755 [59460]: https://github.com/rust-lang/rust/pull/59460/
3756 [59464]: https://github.com/rust-lang/rust/pull/59464/
3757 [59500]: https://github.com/rust-lang/rust/pull/59500/
3758 [59512]: https://github.com/rust-lang/rust/pull/59512/
3759 [59580]: https://github.com/rust-lang/rust/pull/59580/
3760 [59283]: https://github.com/rust-lang/rust/pull/59283/
3761 [59451]: https://github.com/rust-lang/rust/pull/59451/
3762 [59076]: https://github.com/rust-lang/rust/pull/59076/
3763 [58778]: https://github.com/rust-lang/rust/pull/58778/
3764 [58717]: https://github.com/rust-lang/rust/pull/58717/
3765 [58369]: https://github.com/rust-lang/rust/pull/58369/
3766 [58423]: https://github.com/rust-lang/rust/pull/58423/
3767 [58080]: https://github.com/rust-lang/rust/pull/58080/
3768 [57847]: https://github.com/rust-lang/rust/pull/57847/
3769 [58575]: https://github.com/rust-lang/rust/pull/58575
3770 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3771 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3772 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3773 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3774 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3775 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3776 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3777 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3778 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3779 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3780 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3781 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3783 Version 1.34.2 (2019-05-14)
3784 ===========================
3786 * [Destabilize the `Error::type_id` function due to a security
3787 vulnerability][60785] ([CVE-2019-12083])
3789 [60785]: https://github.com/rust-lang/rust/pull/60785
3790 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3792 Version 1.34.1 (2019-04-25)
3793 ===========================
3795 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3796 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3797 * [Fix Clippy panic when checking some macros][clippy/3805]
3799 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3800 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3801 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3803 Version 1.34.0 (2019-04-11)
3804 ==========================
3808 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3809 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3811 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3812 `#[attr{}]` procedural macros.][57367]
3813 - [You can now write `extern crate self as foo;`][57407] to import your
3814 crate's root into the extern prelude.
3819 - [You can now target `riscv64imac-unknown-none-elf` and
3820 `riscv64gc-unknown-none-elf`.][58406]
3821 - [You can now enable linker plugin LTO optimisations with
3822 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3823 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3825 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3830 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3831 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3832 the `Hash` trait to create an iterator.
3833 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3834 methods.][58421] Most notably you no longer require the `Ord` trait to create
3836 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3837 for all numeric types.][58044]
3838 - [Indexing a `str` is now generic over all types that
3839 implement `SliceIndex<str>`.][57604]
3840 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3841 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3842 produce a warning if their returning type is unused.
3843 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3844 `overflowing_pow` are now available for all numeric types.][57873] These are
3845 equivalent to methods such as `wrapping_add` for the `pow` operation.
3853 * [`Error::type_id`]
3854 * [`atomic::AtomicI16`]
3855 * [`atomic::AtomicI32`]
3856 * [`atomic::AtomicI64`]
3857 * [`atomic::AtomicI8`]
3858 * [`atomic::AtomicU16`]
3859 * [`atomic::AtomicU32`]
3860 * [`atomic::AtomicU64`]
3861 * [`atomic::AtomicU8`]
3862 * [`convert::Infallible`]
3863 * [`convert::TryFrom`]
3864 * [`convert::TryInto`]
3866 * [`iter::successors`]
3867 * [`num::NonZeroI128`]
3868 * [`num::NonZeroI16`]
3869 * [`num::NonZeroI32`]
3870 * [`num::NonZeroI64`]
3871 * [`num::NonZeroI8`]
3872 * [`num::NonZeroIsize`]
3873 * [`slice::sort_by_cached_key`]
3874 * [`str::escape_debug`]
3875 * [`str::escape_default`]
3876 * [`str::escape_unicode`]
3877 * [`str::split_ascii_whitespace`]
3880 * [`Instant::checked_add`]
3881 * [`Instant::checked_sub`]
3882 * [`SystemTime::checked_add`]
3883 * [`SystemTime::checked_sub`]
3887 - [You can now use alternative registries to crates.io.][cargo/6654]
3891 - [You can now use the `?` operator in your documentation tests without manually
3892 adding `fn main() -> Result<(), _> {}`.][56470]
3896 - [`Command::before_exec` is being replaced by the unsafe method
3897 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3898 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3899 can now use `const` functions in `static` variables.
3901 [58370]: https://github.com/rust-lang/rust/pull/58370/
3902 [58406]: https://github.com/rust-lang/rust/pull/58406/
3903 [58421]: https://github.com/rust-lang/rust/pull/58421/
3904 [58166]: https://github.com/rust-lang/rust/pull/58166/
3905 [58044]: https://github.com/rust-lang/rust/pull/58044/
3906 [58057]: https://github.com/rust-lang/rust/pull/58057/
3907 [58059]: https://github.com/rust-lang/rust/pull/58059/
3908 [57809]: https://github.com/rust-lang/rust/pull/57809/
3909 [57873]: https://github.com/rust-lang/rust/pull/57873/
3910 [57604]: https://github.com/rust-lang/rust/pull/57604/
3911 [57367]: https://github.com/rust-lang/rust/pull/57367/
3912 [57407]: https://github.com/rust-lang/rust/pull/57407/
3913 [57425]: https://github.com/rust-lang/rust/pull/57425/
3914 [57106]: https://github.com/rust-lang/rust/pull/57106/
3915 [56470]: https://github.com/rust-lang/rust/pull/56470/
3916 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3917 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3918 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3919 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3920 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3921 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3922 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3923 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3924 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3925 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3926 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3927 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3928 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3929 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3930 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3931 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3932 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3933 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3934 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3935 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3936 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3937 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3938 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3939 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3940 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3941 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3942 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3943 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3944 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3945 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3946 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3949 Version 1.33.0 (2019-02-28)
3950 ==========================
3954 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3955 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3956 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3957 E.g. You can have match statement on a `u8` that covers `0..=255` and
3958 you would no longer be required to have a `_ => unreachable!()` case.
3959 - [You can now have multiple patterns in `if let` and `while let`
3960 expressions.][57532] You can do this with the same syntax as a `match`
3970 let state = Creature::Crab("Ferris");
3972 if let Creature::Crab(name) | Creature::Person(name) = state {
3973 println!("This creature's name is: {}", name);
3977 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3978 this feature will by default produce a warning as this behaviour can be
3979 unintuitive. E.g. `if let _ = 5 {}`
3980 - [You can now use `let` bindings, assignments, expression statements,
3981 and irrefutable pattern destructuring in const functions.][57175]
3982 - [You can now call unsafe const functions.][57067] E.g.
3984 const unsafe fn foo() -> i32 { 5 }
3985 const fn bar() -> i32 {
3989 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3990 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3991 - [You can now specify a specific alignment with the `#[repr(packed)]`
3992 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3993 with an alignment of 2 bytes and a size of 6 bytes.
3994 - [You can now import an item from a module as an `_`.][56303] This allows you to
3995 import a trait's impls, and not have the name in the namespace. E.g.
3997 use std::io::Read as _;
3999 // Allowed as there is only one `Read` in the module.
4002 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4006 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4007 command line argument.][56351]
4008 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4009 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4010 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4011 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4012 information on Rust's platform support.
4013 - [Added support for the `thumbv7neon-linux-androideabi` and
4014 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4015 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4019 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4020 functions for all numeric types.][57566]
4021 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4022 are now `const` functions for all numeric types.][57105]
4023 - [The methods `is_positive` and `is_negative` are now `const` functions for
4024 all signed numeric types.][57105]
4025 - [The `get` method for all `NonZero` types is now `const`.][57167]
4026 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4027 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4028 numeric types.][57234]
4029 - [`Ipv4Addr::new` is now a `const` function][57234]
4033 - [`unix::FileExt::read_exact_at`]
4034 - [`unix::FileExt::write_all_at`]
4035 - [`Option::transpose`]
4036 - [`Result::transpose`]
4037 - [`convert::identity`]
4040 - [`marker::PhantomPinned`]
4041 - [`Vec::resize_with`]
4042 - [`VecDeque::resize_with`]
4043 - [`Duration::as_millis`]
4044 - [`Duration::as_micros`]
4045 - [`Duration::as_nanos`]
4050 - [You can now publish crates that require a feature flag to compile with
4051 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4052 - [Cargo should now rebuild a crate if a file was modified during the initial
4057 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4058 are now deprecated in the standard library, and their usage will now produce a warning.
4059 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4061 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4063 - [Libtest no longer creates a new thread for each test when
4064 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4066 [56243]: https://github.com/rust-lang/rust/pull/56243
4067 [56303]: https://github.com/rust-lang/rust/pull/56303/
4068 [56351]: https://github.com/rust-lang/rust/pull/56351/
4069 [56362]: https://github.com/rust-lang/rust/pull/56362
4070 [56642]: https://github.com/rust-lang/rust/pull/56642/
4071 [56769]: https://github.com/rust-lang/rust/pull/56769/
4072 [56805]: https://github.com/rust-lang/rust/pull/56805
4073 [56947]: https://github.com/rust-lang/rust/pull/56947/
4074 [57049]: https://github.com/rust-lang/rust/pull/57049/
4075 [57067]: https://github.com/rust-lang/rust/pull/57067/
4076 [57105]: https://github.com/rust-lang/rust/pull/57105
4077 [57130]: https://github.com/rust-lang/rust/pull/57130/
4078 [57167]: https://github.com/rust-lang/rust/pull/57167/
4079 [57175]: https://github.com/rust-lang/rust/pull/57175/
4080 [57234]: https://github.com/rust-lang/rust/pull/57234/
4081 [57332]: https://github.com/rust-lang/rust/pull/57332/
4082 [57465]: https://github.com/rust-lang/rust/pull/57465/
4083 [57532]: https://github.com/rust-lang/rust/pull/57532/
4084 [57535]: https://github.com/rust-lang/rust/pull/57535/
4085 [57566]: https://github.com/rust-lang/rust/pull/57566/
4086 [57615]: https://github.com/rust-lang/rust/pull/57615/
4087 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4088 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4089 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4090 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4091 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4092 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4093 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4094 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4095 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4096 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4097 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4098 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4099 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4100 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4101 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4102 [platform-support]: https://forge.rust-lang.org/platform-support.html
4104 Version 1.32.0 (2019-01-17)
4105 ==========================
4110 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4111 operator allows you to specify zero or one repetitions similar to the `*` and
4113 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4114 now always resolve to the item (`enum`, `struct`, etc.) available in the
4115 module if present, before resolving to a external crate or an item the prelude.][56759]
4118 enum Color { Red, Green, Blue }
4124 - [You can now match against `PhantomData<T>` types.][55837]
4125 - [You can now match against literals in macros with the `literal`
4126 specifier.][56072] This will match against a literal of any type.
4127 E.g. `1`, `'A'`, `"Hello World"`
4128 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4130 struct Point(i32, i32);
4133 pub fn new(x: i32, y: i32) -> Self {
4137 pub fn is_origin(&self) -> bool {
4145 - [Self can also now be used in type definitions.][56366] E.g.
4149 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4152 Cons(T, Box<Self>) // likewise here
4155 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4156 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4160 - [The default allocator has changed from jemalloc to the default allocator on
4161 your system.][55238] The compiler itself on Linux & macOS will still use
4162 jemalloc, but programs compiled with it will use the system allocator.
4163 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4167 - [`PathBuf` now implements `FromStr`.][55148]
4168 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4169 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4170 easily debug expressions in your rust program. E.g.
4173 let b = dbg!(a * 2) + 1;
4174 // ^-- prints: [src/main.rs:4] a * 2 = 4
4178 The following APIs are now `const` functions and can be used in a
4182 - [`UnsafeCell::get`]
4183 - [`char::is_ascii`]
4185 - [`ManuallyDrop::new`]
4186 - [`ManuallyDrop::into_inner`]
4187 - [`RangeInclusive::start`]
4188 - [`RangeInclusive::end`]
4189 - [`NonNull::as_ptr`]
4192 - [`Duration::as_secs`]
4193 - [`Duration::subsec_millis`]
4194 - [`Duration::subsec_micros`]
4195 - [`Duration::subsec_nanos`]
4197 - [`Ipv4Addr::is_unspecified`]
4199 - [`Ipv6Addr::octets`]
4203 - [`i8::to_be_bytes`]
4204 - [`i8::to_le_bytes`]
4205 - [`i8::to_ne_bytes`]
4206 - [`i8::from_be_bytes`]
4207 - [`i8::from_le_bytes`]
4208 - [`i8::from_ne_bytes`]
4209 - [`i16::to_be_bytes`]
4210 - [`i16::to_le_bytes`]
4211 - [`i16::to_ne_bytes`]
4212 - [`i16::from_be_bytes`]
4213 - [`i16::from_le_bytes`]
4214 - [`i16::from_ne_bytes`]
4215 - [`i32::to_be_bytes`]
4216 - [`i32::to_le_bytes`]
4217 - [`i32::to_ne_bytes`]
4218 - [`i32::from_be_bytes`]
4219 - [`i32::from_le_bytes`]
4220 - [`i32::from_ne_bytes`]
4221 - [`i64::to_be_bytes`]
4222 - [`i64::to_le_bytes`]
4223 - [`i64::to_ne_bytes`]
4224 - [`i64::from_be_bytes`]
4225 - [`i64::from_le_bytes`]
4226 - [`i64::from_ne_bytes`]
4227 - [`i128::to_be_bytes`]
4228 - [`i128::to_le_bytes`]
4229 - [`i128::to_ne_bytes`]
4230 - [`i128::from_be_bytes`]
4231 - [`i128::from_le_bytes`]
4232 - [`i128::from_ne_bytes`]
4233 - [`isize::to_be_bytes`]
4234 - [`isize::to_le_bytes`]
4235 - [`isize::to_ne_bytes`]
4236 - [`isize::from_be_bytes`]
4237 - [`isize::from_le_bytes`]
4238 - [`isize::from_ne_bytes`]
4239 - [`u8::to_be_bytes`]
4240 - [`u8::to_le_bytes`]
4241 - [`u8::to_ne_bytes`]
4242 - [`u8::from_be_bytes`]
4243 - [`u8::from_le_bytes`]
4244 - [`u8::from_ne_bytes`]
4245 - [`u16::to_be_bytes`]
4246 - [`u16::to_le_bytes`]
4247 - [`u16::to_ne_bytes`]
4248 - [`u16::from_be_bytes`]
4249 - [`u16::from_le_bytes`]
4250 - [`u16::from_ne_bytes`]
4251 - [`u32::to_be_bytes`]
4252 - [`u32::to_le_bytes`]
4253 - [`u32::to_ne_bytes`]
4254 - [`u32::from_be_bytes`]
4255 - [`u32::from_le_bytes`]
4256 - [`u32::from_ne_bytes`]
4257 - [`u64::to_be_bytes`]
4258 - [`u64::to_le_bytes`]
4259 - [`u64::to_ne_bytes`]
4260 - [`u64::from_be_bytes`]
4261 - [`u64::from_le_bytes`]
4262 - [`u64::from_ne_bytes`]
4263 - [`u128::to_be_bytes`]
4264 - [`u128::to_le_bytes`]
4265 - [`u128::to_ne_bytes`]
4266 - [`u128::from_be_bytes`]
4267 - [`u128::from_le_bytes`]
4268 - [`u128::from_ne_bytes`]
4269 - [`usize::to_be_bytes`]
4270 - [`usize::to_le_bytes`]
4271 - [`usize::to_ne_bytes`]
4272 - [`usize::from_be_bytes`]
4273 - [`usize::from_le_bytes`]
4274 - [`usize::from_ne_bytes`]
4278 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4279 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4283 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4287 - [The argument types for AVX's
4288 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4289 been changed from `*const` to `*mut` as the previous implementation
4293 [55148]: https://github.com/rust-lang/rust/pull/55148/
4294 [55238]: https://github.com/rust-lang/rust/pull/55238/
4295 [55280]: https://github.com/rust-lang/rust/pull/55280/
4296 [55610]: https://github.com/rust-lang/rust/pull/55610/
4297 [55663]: https://github.com/rust-lang/rust/pull/55663/
4298 [55702]: https://github.com/rust-lang/rust/pull/55702/
4299 [55837]: https://github.com/rust-lang/rust/pull/55837/
4300 [55843]: https://github.com/rust-lang/rust/pull/55843/
4301 [56072]: https://github.com/rust-lang/rust/pull/56072/
4302 [56245]: https://github.com/rust-lang/rust/pull/56245/
4303 [56365]: https://github.com/rust-lang/rust/pull/56365/
4304 [56366]: https://github.com/rust-lang/rust/pull/56366/
4305 [56395]: https://github.com/rust-lang/rust/pull/56395/
4306 [56759]: https://github.com/rust-lang/rust/pull/56759/
4307 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4308 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4309 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4310 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4311 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4312 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4313 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4314 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4315 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4316 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4317 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4318 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4319 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4320 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4321 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4322 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4323 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4324 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4325 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4326 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4327 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4328 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4329 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4330 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4331 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4332 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4333 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4334 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4335 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4336 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4337 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4338 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4339 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4340 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4341 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4342 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4343 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4344 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4345 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4346 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4347 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4348 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4349 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4350 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4351 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4352 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4353 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4354 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4355 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4356 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4357 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4358 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4359 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4360 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4361 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4362 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4363 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4364 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4365 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4366 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4367 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4368 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4369 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4370 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4371 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4372 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4373 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4374 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4375 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4376 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4377 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4378 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4379 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4380 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4381 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4382 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4383 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4384 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4385 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4386 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4387 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4388 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4389 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4390 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4391 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4392 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4393 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4394 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4395 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4396 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4397 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4398 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4399 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4402 Version 1.31.1 (2018-12-20)
4403 ===========================
4405 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4406 - [Fix broken go-to-definition in RLS][rls/1171]
4407 - [Fix infinite loop on hover in RLS][rls/1170]
4409 [56562]: https://github.com/rust-lang/rust/pull/56562
4410 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4411 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4413 Version 1.31.0 (2018-12-06)
4414 ==========================
4418 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4419 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4420 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4421 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4423 - [You can now define and use `const` functions.][54835] These are currently
4424 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4425 [language reference][const-reference] for what exactly is available.
4426 - [You can now use tool lints, which allow you to scope lints from external
4427 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4428 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4429 a crate, not just in exported functions.][54451]
4430 - [You can now use parentheses in pattern matches.][54497]
4434 - [Updated musl to 1.1.20][54430]
4438 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4439 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4440 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4441 into `Option<&mut T>` using the `From` trait.][53218]
4442 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4447 - [`slice::align_to`]
4448 - [`slice::align_to_mut`]
4449 - [`slice::chunks_exact`]
4450 - [`slice::chunks_exact_mut`]
4451 - [`slice::rchunks`]
4452 - [`slice::rchunks_mut`]
4453 - [`slice::rchunks_exact`]
4454 - [`slice::rchunks_exact_mut`]
4455 - [`Option::replace`]
4459 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4460 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4461 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4463 [52813]: https://github.com/rust-lang/rust/pull/52813/
4464 [53218]: https://github.com/rust-lang/rust/pull/53218/
4465 [54057]: https://github.com/rust-lang/rust/pull/54057/
4466 [54240]: https://github.com/rust-lang/rust/pull/54240/
4467 [54430]: https://github.com/rust-lang/rust/pull/54430/
4468 [54451]: https://github.com/rust-lang/rust/pull/54451/
4469 [54497]: https://github.com/rust-lang/rust/pull/54497/
4470 [54778]: https://github.com/rust-lang/rust/pull/54778/
4471 [54835]: https://github.com/rust-lang/rust/pull/54835/
4472 [54870]: https://github.com/rust-lang/rust/pull/54870/
4473 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4474 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4475 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4476 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4477 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4478 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4479 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4480 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4481 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4482 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4483 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4484 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4485 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4486 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4488 Version 1.30.1 (2018-11-08)
4489 ===========================
4491 - [Fixed overflow ICE in rustdoc][54199]
4492 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4494 [54199]: https://github.com/rust-lang/rust/pull/54199
4495 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4497 Version 1.30.0 (2018-10-25)
4498 ==========================
4502 - [Procedural macros are now available.][52081] These kinds of macros allow for
4503 more powerful code generation. There is a [new chapter available][proc-macros]
4504 in the Rust Programming Language book that goes further in depth.
4505 - [You can now use keywords as identifiers using the raw identifiers
4506 syntax (`r#`),][53236] e.g. `let r#for = true;`
4507 - [Using anonymous parameters in traits is now deprecated with a warning and
4508 will be a hard error in the 2018 edition.][53272]
4509 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4510 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4511 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4512 Previously, using a external crate in a module without a use statement
4513 required `let json = ::serde_json::from_str(foo);` but can now be written
4514 as `let json = serde_json::from_str(foo);`.
4515 - [You can now apply the `#[used]` attribute to static items to prevent the
4516 compiler from optimising them away, even if they appear to be unused,][51363]
4517 e.g. `#[used] static FOO: u32 = 1;`
4518 - [You can now import and reexport macros from other crates with the `use`
4519 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4520 the root module of the crate. If your macro relies on calling other local
4521 macros, it is recommended to export with the
4522 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4524 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4525 using the `vis` specifier.][53370]
4526 - [Non-macro attributes now allow all forms of literals, not just
4527 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4528 write `#[attr(true)]`.
4529 - [You can now specify a function to handle a panic in the Rust runtime with the
4530 `#[panic_handler]` attribute.][51366]
4534 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4535 - [Added the `aarch64-unknown-netbsd` target][53165]
4536 - [Upgraded to LLVM 8.][53611]
4540 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4544 - [`Ipv4Addr::BROADCAST`]
4545 - [`Ipv4Addr::LOCALHOST`]
4546 - [`Ipv4Addr::UNSPECIFIED`]
4547 - [`Ipv6Addr::LOCALHOST`]
4548 - [`Ipv6Addr::UNSPECIFIED`]
4549 - [`Iterator::find_map`]
4551 The following methods are replacement methods for `trim_left`, `trim_right`,
4552 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4554 - [`str::trim_end_matches`]
4556 - [`str::trim_start_matches`]
4557 - [`str::trim_start`]
4561 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4562 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4563 equivalent to calling `rustdoc --error-format=json`.
4564 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4568 - [`rustdoc` allows you to specify what edition to treat your code as with the
4569 `--edition` option.][54057]
4570 - [`rustdoc` now has the `--color` (specify whether to output color) and
4571 `--error-format` (specify error format, e.g. `json`) options.][53003]
4572 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4573 debug symbols.][53774]
4574 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4575 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4577 [50911]: https://github.com/rust-lang/rust/pull/50911/
4578 [51363]: https://github.com/rust-lang/rust/pull/51363/
4579 [51366]: https://github.com/rust-lang/rust/pull/51366/
4580 [52081]: https://github.com/rust-lang/rust/pull/52081/
4581 [53003]: https://github.com/rust-lang/rust/pull/53003/
4582 [53033]: https://github.com/rust-lang/rust/pull/53033/
4583 [53044]: https://github.com/rust-lang/rust/pull/53044/
4584 [53165]: https://github.com/rust-lang/rust/pull/53165/
4585 [53611]: https://github.com/rust-lang/rust/pull/53611/
4586 [53236]: https://github.com/rust-lang/rust/pull/53236/
4587 [53272]: https://github.com/rust-lang/rust/pull/53272/
4588 [53370]: https://github.com/rust-lang/rust/pull/53370/
4589 [53459]: https://github.com/rust-lang/rust/pull/53459/
4590 [53774]: https://github.com/rust-lang/rust/pull/53774/
4591 [53822]: https://github.com/rust-lang/rust/pull/53822/
4592 [54057]: https://github.com/rust-lang/rust/pull/54057/
4593 [54404]: https://github.com/rust-lang/rust/pull/54404/
4594 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4595 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4596 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4597 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4599 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4600 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4601 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4602 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4603 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4604 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4605 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4606 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4607 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4608 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4611 Version 1.29.2 (2018-10-11)
4612 ===========================
4614 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4615 - The `rls-preview` component on the windows-gnu targets has been restored.
4617 [54639]: https://github.com/rust-lang/rust/pull/54639
4620 Version 1.29.1 (2018-09-25)
4621 ===========================
4626 - The standard library's `str::repeat` function contained an out of bounds write
4627 caused by an integer overflow. This has been fixed by deterministically
4628 panicking when an overflow happens.
4630 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4634 Version 1.29.0 (2018-09-13)
4635 ==========================
4639 - [Bumped minimum LLVM version to 5.0.][51899]
4640 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4641 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4642 - [Upgraded to LLVM 7.][51966]
4646 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4647 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4648 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4649 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4651 - [`Cell<T>` now allows `T` to be unsized.][50494]
4652 - [`SocketAddr` is now stable on Redox.][52656]
4657 - [`Iterator::flatten`]
4662 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4663 `--locked` to disable this behavior.
4664 - [`cargo-install` will now allow you to cross compile an install
4665 using `--target`.][cargo/5614]
4666 - [Added the `cargo-fix` subcommand to automatically move project code from
4667 2015 edition to 2018.][cargo/5723]
4668 - [`cargo doc` can now optionally document private types using the
4669 `--document-private-items` flag.][cargo/5543]
4673 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4674 the specified level to that level.][52354] For example `--cap-lints warn`
4675 will demote `deny` and `forbid` lints to `warn`.
4676 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4677 fails and `101` if there is a panic.][52197]
4678 - [A preview of clippy has been made available through rustup.][51122]
4679 You can install the preview with `rustup component add clippy-preview`.
4683 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4684 Use `str::get_unchecked(begin..end)` instead.
4685 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4686 Consider using the `home_dir` function from
4687 https://crates.io/crates/dirs instead.
4688 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4689 - [`cfg` attributes and `--cfg` command line flags are now more
4690 strictly validated.][53893]
4692 [53893]: https://github.com/rust-lang/rust/pull/53893/
4693 [52861]: https://github.com/rust-lang/rust/pull/52861/
4694 [51966]: https://github.com/rust-lang/rust/pull/51966/
4695 [52656]: https://github.com/rust-lang/rust/pull/52656/
4696 [52239]: https://github.com/rust-lang/rust/pull/52239/
4697 [52330]: https://github.com/rust-lang/rust/pull/52330/
4698 [52354]: https://github.com/rust-lang/rust/pull/52354/
4699 [52402]: https://github.com/rust-lang/rust/pull/52402/
4700 [52197]: https://github.com/rust-lang/rust/pull/52197/
4701 [51807]: https://github.com/rust-lang/rust/pull/51807/
4702 [51899]: https://github.com/rust-lang/rust/pull/51899/
4703 [51912]: https://github.com/rust-lang/rust/pull/51912/
4704 [51619]: https://github.com/rust-lang/rust/pull/51619/
4705 [51656]: https://github.com/rust-lang/rust/pull/51656/
4706 [51178]: https://github.com/rust-lang/rust/pull/51178/
4707 [51122]: https://github.com/rust-lang/rust/pull/51122
4708 [50494]: https://github.com/rust-lang/rust/pull/50494/
4709 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4710 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4711 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4712 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4713 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4714 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4715 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4718 Version 1.28.0 (2018-08-02)
4719 ===========================
4723 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4724 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4725 the inner type across Foreign Function Interface (FFI) boundaries.
4726 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4727 and can now be used as identifiers.][51196]
4728 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4729 stable.][51241] This will allow users to specify a global allocator for
4731 - [Unit test functions marked with the `#[test]` attribute can now return
4732 `Result<(), E: Debug>` in addition to `()`.][51298]
4733 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4734 allows macros to easily target lifetimes.
4738 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4739 prioritise making smaller binary sizes. `z` is the same as `s` with the
4740 exception that it does not vectorise loops, which typically results in an even
4742 - [The short error format is now stable.][49546] Specified with
4743 `--error-format=short` this option will provide a more compressed output of
4744 rust error messages.
4745 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4746 - [Reduced the number of allocations in the macro parser.][50855] This can
4747 improve compile times of macro heavy crates on average by 5%.
4751 - [Implemented `Default` for `&mut str`.][51306]
4752 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4753 - [Implemented `Extend` for `()`.][50234]
4754 - [The `Debug` implementation of `time::Duration` should now be more easily
4755 human readable.][50364] Previously a `Duration` of one second would printed as
4756 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4757 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4758 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4759 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4760 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4761 for `PathBuf`.][50170]
4762 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4763 and `Wrapping<i128>`.][50465]
4764 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4765 possible.][51050] This can provide up to a 40% speed increase.
4766 - [Improved error messages when using `format!`.][50610]
4770 - [`Iterator::step_by`]
4771 - [`Path::ancestors`]
4772 - [`SystemTime::UNIX_EPOCH`]
4773 - [`alloc::GlobalAlloc`]
4775 - [`alloc::LayoutErr`]
4778 - [`alloc::alloc_zeroed`]
4779 - [`alloc::dealloc`]
4780 - [`alloc::realloc`]
4781 - [`alloc::handle_alloc_error`]
4782 - [`btree_map::Entry::or_default`]
4783 - [`fmt::Alignment`]
4784 - [`hash_map::Entry::or_default`]
4785 - [`iter::repeat_with`]
4786 - [`num::NonZeroUsize`]
4787 - [`num::NonZeroU128`]
4788 - [`num::NonZeroU16`]
4789 - [`num::NonZeroU32`]
4790 - [`num::NonZeroU64`]
4791 - [`num::NonZeroU8`]
4792 - [`ops::RangeBounds`]
4793 - [`slice::SliceIndex`]
4794 - [`slice::from_mut`]
4795 - [`slice::from_ref`]
4796 - [`{Any + Send + Sync}::downcast_mut`]
4797 - [`{Any + Send + Sync}::downcast_ref`]
4798 - [`{Any + Send + Sync}::is`]
4802 - [Cargo will now no longer allow you to publish crates with build scripts that
4803 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4804 considered to be immutable.
4808 - [The `suggestion_applicability` field in `rustc`'s json output is now
4809 stable.][50486] This will allow dev tools to check whether a code suggestion
4810 would apply to them.
4814 - [Rust will consider trait objects with duplicated constraints to be the same
4815 type as without the duplicated constraint.][51276] For example the below code will
4816 now fail to compile.
4821 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4824 impl Trait + Send + Send {
4825 fn test(&self) { println!("two"); }
4829 [49546]: https://github.com/rust-lang/rust/pull/49546/
4830 [50143]: https://github.com/rust-lang/rust/pull/50143/
4831 [50170]: https://github.com/rust-lang/rust/pull/50170/
4832 [50234]: https://github.com/rust-lang/rust/pull/50234/
4833 [50265]: https://github.com/rust-lang/rust/pull/50265/
4834 [50364]: https://github.com/rust-lang/rust/pull/50364/
4835 [50385]: https://github.com/rust-lang/rust/pull/50385/
4836 [50465]: https://github.com/rust-lang/rust/pull/50465/
4837 [50486]: https://github.com/rust-lang/rust/pull/50486/
4838 [50554]: https://github.com/rust-lang/rust/pull/50554/
4839 [50610]: https://github.com/rust-lang/rust/pull/50610/
4840 [50855]: https://github.com/rust-lang/rust/pull/50855/
4841 [51050]: https://github.com/rust-lang/rust/pull/51050/
4842 [51196]: https://github.com/rust-lang/rust/pull/51196/
4843 [51241]: https://github.com/rust-lang/rust/pull/51241/
4844 [51276]: https://github.com/rust-lang/rust/pull/51276/
4845 [51298]: https://github.com/rust-lang/rust/pull/51298/
4846 [51306]: https://github.com/rust-lang/rust/pull/51306/
4847 [51562]: https://github.com/rust-lang/rust/pull/51562/
4848 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4849 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4850 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4851 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4852 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4853 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4854 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4855 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4856 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4857 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4858 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4859 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4860 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4861 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4862 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4863 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4864 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4865 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4866 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4867 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4868 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4869 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4870 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4871 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4872 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4873 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4874 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4875 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4876 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4877 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4879 Version 1.27.2 (2018-07-20)
4880 ===========================
4885 - The borrow checker was fixed to avoid potential unsoundness when using
4886 match ergonomics: [#52213][52213].
4888 [52213]: https://github.com/rust-lang/rust/issues/52213
4890 Version 1.27.1 (2018-07-10)
4891 ===========================
4896 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4897 when running, which enabled executing code as some other user on a
4898 given machine. This release fixes that vulnerability; you can read
4899 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4901 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4906 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4907 match ergonomics: [#51415][51415], [#49534][49534].
4909 [51415]: https://github.com/rust-lang/rust/issues/51415
4910 [49534]: https://github.com/rust-lang/rust/issues/49534
4911 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4912 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4914 Version 1.27.0 (2018-06-21)
4915 ==========================
4919 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4920 be used as an identifier.
4921 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4922 bare `Trait` syntax, and should make it clearer when being used in tandem with
4923 `impl Trait` because it is equivalent to the following syntax:
4924 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4925 `Box<Trait> == Box<dyn Trait>`.
4926 - [Attributes on generic parameters such as types and lifetimes are
4927 now stable.][48851] e.g.
4928 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4929 - [The `#[must_use]` attribute can now also be used on functions as well as
4930 types.][48925] It provides a lint that by default warns users when the
4931 value returned by a function has not been used.
4935 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4939 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4940 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4941 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4942 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4943 the `cfg` attribute.
4944 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4945 std are now available in core.][49896]
4946 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4948 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4949 that the operation isn't done in place.
4950 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4951 the `#[must_use]` attribute][49533] to warn about unused potentially
4952 expensive allocations.
4956 - [`DoubleEndedIterator::rfind`]
4957 - [`DoubleEndedIterator::rfold`]
4958 - [`DoubleEndedIterator::try_rfold`]
4959 - [`Duration::from_micros`]
4960 - [`Duration::from_nanos`]
4961 - [`Duration::subsec_micros`]
4962 - [`Duration::subsec_millis`]
4963 - [`HashMap::remove_entry`]
4964 - [`Iterator::try_fold`]
4965 - [`Iterator::try_for_each`]
4967 - [`Option::filter`]
4968 - [`String::replace_range`]
4969 - [`Take::set_limit`]
4970 - [`hint::unreachable_unchecked`]
4971 - [`os::unix::process::parent_id`]
4972 - [`ptr::swap_nonoverlapping`]
4973 - [`slice::rsplit_mut`]
4975 - [`slice::swap_with_slice`]
4979 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4980 `readme`, and `repository` fields.][cargo/5386]
4981 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4982 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4983 a different directory than `target` for placing compilation artifacts.
4984 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4985 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4986 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4987 where cargo would infer a binary, Cargo will produce a warning. You can
4988 disable this feature ahead of time by setting any of the following to false:
4989 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4990 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4991 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4995 - [Added “The Rustc book” into the official documentation.][49707]
4996 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4997 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5001 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5002 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5003 compile, `"".is_empty()` will still compile.
5004 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5005 will only print the inner type.][48553] E.g.
5006 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5007 not `AtomicBool(true)`.
5008 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5009 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5010 alignment should cover all use cases.
5011 - The `.description()` method on the `std::error::Error` trait
5012 [has been soft-deprecated][50163]. It is no longer required to implement it.
5014 [48553]: https://github.com/rust-lang/rust/pull/48553/
5015 [48851]: https://github.com/rust-lang/rust/pull/48851/
5016 [48925]: https://github.com/rust-lang/rust/pull/48925/
5017 [49533]: https://github.com/rust-lang/rust/pull/49533/
5018 [49623]: https://github.com/rust-lang/rust/pull/49623/
5019 [49630]: https://github.com/rust-lang/rust/pull/49630/
5020 [49664]: https://github.com/rust-lang/rust/pull/49664/
5021 [49699]: https://github.com/rust-lang/rust/pull/49699/
5022 [49707]: https://github.com/rust-lang/rust/pull/49707/
5023 [49896]: https://github.com/rust-lang/rust/pull/49896/
5024 [49968]: https://github.com/rust-lang/rust/pull/49968/
5025 [50163]: https://github.com/rust-lang/rust/pull/50163
5026 [50177]: https://github.com/rust-lang/rust/pull/50177/
5027 [50378]: https://github.com/rust-lang/rust/pull/50378/
5028 [50423]: https://github.com/rust-lang/rust/pull/50423/
5029 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5030 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5031 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5032 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5033 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5034 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5035 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5036 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5037 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5038 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5039 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5040 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5041 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5042 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5043 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5044 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5045 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5046 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5047 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5048 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5049 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5050 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5051 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5052 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5053 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5054 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5055 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5056 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5057 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5060 Version 1.26.2 (2018-06-05)
5061 ==========================
5066 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5068 [51117]: https://github.com/rust-lang/rust/issues/51117
5071 Version 1.26.1 (2018-05-29)
5072 ==========================
5077 - [RLS now works on Windows.][50646]
5078 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5084 - [`fn main() -> impl Trait` no longer works for non-Termination
5086 This reverts an accidental stabilization.
5087 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5088 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5090 [50646]: https://github.com/rust-lang/rust/issues/50646
5091 [50656]: https://github.com/rust-lang/rust/pull/50656
5092 [50812]: https://github.com/rust-lang/rust/pull/50812
5093 [50950]: https://github.com/rust-lang/rust/issues/50950
5094 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5096 Version 1.26.0 (2018-05-10)
5097 ==========================
5101 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5102 implement either or both traits.][49299]
5103 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5104 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5105 lifetime can be elided.][49458]
5106 - [`impl Trait` is now stable allowing you to have abstract types in returns
5107 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5108 `fn open(path: impl AsRef<Path>)`.
5109 - [Pattern matching will now automatically apply dereferences.][49394]
5110 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5111 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5112 - [A lot of operations are now available in a const context.][46882] E.g. You
5113 can now index into constant arrays, reference and dereference into constants,
5114 and use tuple struct constructors.
5115 - [Fixed entry slice patterns are now stable.][48516] E.g.
5117 let points = [1, 2, 3, 4];
5119 [1, 2, 3, 4] => println!("All points were sequential."),
5120 _ => println!("Not all points were sequential."),
5127 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5128 - [Fixed exponential projection complexity on nested types.][48296]
5129 This can provide up to a ~12% reduction in compile times for certain crates.
5130 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5131 to remap path prefixes outputted by the compiler.
5132 - [Added `powerpc-unknown-netbsd` target.][48281]
5136 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5137 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5138 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5139 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5140 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5141 - [`ascii::escape_default` is now available in libcore.][48735]
5142 - [Trailing commas are now supported in std and core macros.][48056]
5143 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5144 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5149 - [`*const T::copy_to_nonoverlapping`]
5150 - [`*const T::copy_to`]
5151 - [`*const T::read_unaligned`]
5152 - [`*const T::read_volatile`]
5153 - [`*const T::read`]
5155 - [`*const T::wrapping_add`]
5156 - [`*const T::wrapping_sub`]
5158 - [`*mut T::copy_to_nonoverlapping`]
5159 - [`*mut T::copy_to`]
5160 - [`*mut T::read_unaligned`]
5161 - [`*mut T::read_volatile`]
5163 - [`*mut T::replace`]
5166 - [`*mut T::wrapping_add`]
5167 - [`*mut T::wrapping_sub`]
5168 - [`*mut T::write_bytes`]
5169 - [`*mut T::write_unaligned`]
5170 - [`*mut T::write_volatile`]
5173 - [`FromUtf8Error::as_bytes`]
5174 - [`LocalKey::try_with`]
5175 - [`Option::cloned`]
5176 - [`btree_map::Entry::and_modify`]
5177 - [`fs::read_to_string`]
5180 - [`hash_map::Entry::and_modify`]
5181 - [`iter::FusedIterator`]
5182 - [`ops::RangeInclusive`]
5183 - [`ops::RangeToInclusive`]
5185 - [`slice::rotate_left`]
5186 - [`slice::rotate_right`]
5187 - [`String::retain`]
5192 - [Cargo will now output path to custom commands when `-v` is
5193 passed with `--list`][cargo/5041]
5194 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5198 - [The second edition of "The Rust Programming Language" book is now recommended
5199 over the first.][48404]
5204 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5205 syntax is now invalid.
5207 use std::ops::Fn as dyn;
5208 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5210 - [The result of dereferences are no longer promoted to `'static`.][47408]
5214 const PAIR: &(i32, i32) = &(0, 1);
5215 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5218 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5219 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5221 - [Removed hoedown from rustdoc.][48274]
5222 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5224 [46882]: https://github.com/rust-lang/rust/pull/46882
5225 [47379]: https://github.com/rust-lang/rust/pull/47379
5226 [47408]: https://github.com/rust-lang/rust/pull/47408
5227 [47813]: https://github.com/rust-lang/rust/pull/47813
5228 [48056]: https://github.com/rust-lang/rust/pull/48056
5229 [48125]: https://github.com/rust-lang/rust/pull/48125
5230 [48235]: https://github.com/rust-lang/rust/pull/48235
5231 [48274]: https://github.com/rust-lang/rust/pull/48274
5232 [48281]: https://github.com/rust-lang/rust/pull/48281
5233 [48296]: https://github.com/rust-lang/rust/pull/48296
5234 [48326]: https://github.com/rust-lang/rust/pull/48326
5235 [48359]: https://github.com/rust-lang/rust/pull/48359
5236 [48404]: https://github.com/rust-lang/rust/pull/48404
5237 [48481]: https://github.com/rust-lang/rust/pull/48481
5238 [48516]: https://github.com/rust-lang/rust/pull/48516
5239 [48628]: https://github.com/rust-lang/rust/pull/48628
5240 [48629]: https://github.com/rust-lang/rust/pull/48629
5241 [48657]: https://github.com/rust-lang/rust/pull/48657
5242 [48735]: https://github.com/rust-lang/rust/pull/48735
5243 [48978]: https://github.com/rust-lang/rust/pull/48978
5244 [49101]: https://github.com/rust-lang/rust/pull/49101
5245 [49109]: https://github.com/rust-lang/rust/pull/49109
5246 [49162]: https://github.com/rust-lang/rust/pull/49162
5247 [49255]: https://github.com/rust-lang/rust/pull/49255
5248 [49299]: https://github.com/rust-lang/rust/pull/49299
5249 [49305]: https://github.com/rust-lang/rust/pull/49305
5250 [49394]: https://github.com/rust-lang/rust/pull/49394
5251 [49458]: https://github.com/rust-lang/rust/pull/49458
5252 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5253 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5254 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5255 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5256 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5257 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5258 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5259 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5260 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5261 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5262 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5263 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5264 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5265 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5266 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5267 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5268 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5269 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5270 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5271 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5272 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5273 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5274 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5275 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5276 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5277 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5278 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5279 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5280 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5281 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5282 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5283 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5284 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5285 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5286 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5287 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5288 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5289 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5290 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5291 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5292 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5293 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5296 Version 1.25.0 (2018-03-29)
5297 ==========================
5301 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5302 - [You can now use nested groups of imports.][47948]
5303 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5304 - [You can now have `|` at the start of a match arm.][47947] e.g.
5306 enum Foo { A, B, C }
5312 | Foo::B => println!("AB"),
5313 | Foo::C => println!("C"),
5320 - [Upgraded to LLVM 6.][47828]
5321 - [Added `-C lto=val` option.][47521]
5322 - [Added `i586-unknown-linux-musl` target][47282]
5326 - [Impl Send for `process::Command` on Unix.][47760]
5327 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5328 - [`UnsafeCell::into_inner` is now safe.][47204]
5329 - [Implement libstd for CloudABI.][47268]
5330 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5331 - [Implement `AsRef<Path>` for Component][46985]
5332 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5333 - [Moved `Duration` to libcore.][46666]
5337 - [`Location::column`]
5340 The following functions can now be used in a constant expression.
5341 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5342 - [`Duration::new`][47300]
5343 - [`Duration::from_secs`][47300]
5344 - [`Duration::from_millis`][47300]
5348 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5349 - [`cargo new` now defaults to creating a binary crate, instead of a
5350 library crate.][cargo/5029]
5354 - [Rust by example is now shipped with new releases][46196]
5358 - [Deprecated `net::lookup_host`.][47510]
5359 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5360 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5361 around indexing operations (see [#47349][47349]). This has been fixed (which also
5362 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5363 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5365 [33903]: https://github.com/rust-lang/rust/pull/33903
5366 [47947]: https://github.com/rust-lang/rust/pull/47947
5367 [47948]: https://github.com/rust-lang/rust/pull/47948
5368 [47760]: https://github.com/rust-lang/rust/pull/47760
5369 [47790]: https://github.com/rust-lang/rust/pull/47790
5370 [47828]: https://github.com/rust-lang/rust/pull/47828
5371 [47398]: https://github.com/rust-lang/rust/pull/47398
5372 [47510]: https://github.com/rust-lang/rust/pull/47510
5373 [47521]: https://github.com/rust-lang/rust/pull/47521
5374 [47204]: https://github.com/rust-lang/rust/pull/47204
5375 [47251]: https://github.com/rust-lang/rust/pull/47251
5376 [47268]: https://github.com/rust-lang/rust/pull/47268
5377 [47282]: https://github.com/rust-lang/rust/pull/47282
5378 [47300]: https://github.com/rust-lang/rust/pull/47300
5379 [47349]: https://github.com/rust-lang/rust/pull/47349
5380 [46931]: https://github.com/rust-lang/rust/pull/46931
5381 [46985]: https://github.com/rust-lang/rust/pull/46985
5382 [47006]: https://github.com/rust-lang/rust/pull/47006
5383 [46830]: https://github.com/rust-lang/rust/pull/46830
5384 [46095]: https://github.com/rust-lang/rust/pull/46095
5385 [46666]: https://github.com/rust-lang/rust/pull/46666
5386 [46196]: https://github.com/rust-lang/rust/pull/46196
5387 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5388 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5389 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5390 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5391 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5394 Version 1.24.1 (2018-03-01)
5395 ==========================
5397 - [Do not abort when unwinding through FFI][48251]
5398 - [Emit UTF-16 files for linker arguments on Windows][48318]
5399 - [Make the error index generator work again][48308]
5400 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5402 [48251]: https://github.com/rust-lang/rust/issues/48251
5403 [48308]: https://github.com/rust-lang/rust/issues/48308
5404 [48318]: https://github.com/rust-lang/rust/issues/48318
5405 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5408 Version 1.24.0 (2018-02-15)
5409 ==========================
5413 - [External `sysv64` ffi is now available.][46528]
5414 eg. `extern "sysv64" fn foo () {}`
5418 - [rustc now uses 16 codegen units by default for release builds.][46910]
5419 For the fastest builds, utilize `codegen-units=1`.
5420 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5421 - [Add `aarch64-unknown-openbsd` support][46760]
5425 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5426 improvement in performance in the majority of cases.
5427 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5428 with Windows.][46798]
5429 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5430 - [impl `From<bool>` for `AtomicBool`][46293]
5431 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5432 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5433 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5434 - [float::from_bits now just uses transmute.][46012] This provides
5435 some optimisations from LLVM.
5436 - [Copied `AsciiExt` methods onto `char`][46077]
5437 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5438 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5439 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5440 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5444 - [`RefCell::replace`]
5446 - [`atomic::spin_loop_hint`]
5448 The following functions can now be used in a constant expression.
5449 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5451 - [`AtomicBool::new`][46287]
5452 - [`AtomicUsize::new`][46287]
5453 - [`AtomicIsize::new`][46287]
5454 - [`AtomicPtr::new`][46287]
5455 - [`Cell::new`][46287]
5456 - [`{integer}::min_value`][46287]
5457 - [`{integer}::max_value`][46287]
5458 - [`mem::size_of`][46287]
5459 - [`mem::align_of`][46287]
5460 - [`ptr::null`][46287]
5461 - [`ptr::null_mut`][46287]
5462 - [`RefCell::new`][46287]
5463 - [`UnsafeCell::new`][46287]
5467 - [Added a `workspace.default-members` config that
5468 overrides implied `--all` in virtual workspaces.][cargo/4743]
5469 - [Enable incremental by default on development builds.][cargo/4817] Also added
5470 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5471 per-project or global basis respectively.
5478 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5479 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5480 in accordance with IETF RFC 4291 §2.2.
5481 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5482 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5483 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5484 - [Leading zeros in tuple struct members is now an error][47084]
5485 - [`column!()` macro is one-based instead of zero-based][46977]
5486 - [`fmt::Arguments` can no longer be shared across threads][45198]
5487 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5488 - [Cargo sets a different working directory for the compiler][cargo/4788]
5490 [44884]: https://github.com/rust-lang/rust/pull/44884
5491 [45198]: https://github.com/rust-lang/rust/pull/45198
5492 [45506]: https://github.com/rust-lang/rust/pull/45506
5493 [45990]: https://github.com/rust-lang/rust/pull/45990
5494 [46012]: https://github.com/rust-lang/rust/pull/46012
5495 [46077]: https://github.com/rust-lang/rust/pull/46077
5496 [46094]: https://github.com/rust-lang/rust/pull/46094
5497 [46284]: https://github.com/rust-lang/rust/pull/46284
5498 [46287]: https://github.com/rust-lang/rust/pull/46287
5499 [46293]: https://github.com/rust-lang/rust/pull/46293
5500 [46528]: https://github.com/rust-lang/rust/pull/46528
5501 [46671]: https://github.com/rust-lang/rust/pull/46671
5502 [46713]: https://github.com/rust-lang/rust/pull/46713
5503 [46735]: https://github.com/rust-lang/rust/pull/46735
5504 [46760]: https://github.com/rust-lang/rust/pull/46760
5505 [46798]: https://github.com/rust-lang/rust/pull/46798
5506 [46828]: https://github.com/rust-lang/rust/pull/46828
5507 [46831]: https://github.com/rust-lang/rust/pull/46831
5508 [46833]: https://github.com/rust-lang/rust/pull/46833
5509 [46910]: https://github.com/rust-lang/rust/pull/46910
5510 [46977]: https://github.com/rust-lang/rust/pull/46977
5511 [47018]: https://github.com/rust-lang/rust/pull/47018
5512 [47080]: https://github.com/rust-lang/rust/pull/47080
5513 [47084]: https://github.com/rust-lang/rust/pull/47084
5514 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5515 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5516 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5517 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5518 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5519 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5522 Version 1.23.0 (2018-01-04)
5523 ==========================
5527 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5528 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5529 Which should fix some confusing errors in some operations.
5533 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5534 undefined behavior.][45920]
5535 - [rustc now suggests renaming import if names clash.][45660]
5536 - [Display errors/warnings correctly when there are zero-width or
5537 wide characters.][45711]
5538 - [rustc now avoids unnecessary copies of arguments that are
5539 simple bindings][45380] This should improve memory usage on average by 5-10%.
5540 - [Updated musl used to build musl rustc to 1.1.17][45393]
5544 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5545 - [Implement Hash for raw pointers to unsized types][45483]
5546 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5547 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5548 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5549 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5550 and `<*mut T>::as_mut`][44932]
5551 - [Optimized `Thread::{park, unpark}` implementation][45524]
5552 - [Improved `SliceExt::binary_search` performance.][45333]
5553 - [impl `FromIterator<()>` for `()`][45379]
5554 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5562 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5563 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5564 - [Added unit test checking to `cargo check`][cargo/4592]
5565 - [Cargo now lets you install a specific version
5566 using `cargo install --version`][cargo/4637]
5570 - [Releases now ship with the Cargo book documentation.][45692]
5571 - [rustdoc now prints rendering warnings on every run.][45324]
5575 - [Changes have been made to type equality to make it more correct,
5576 in rare cases this could break some code.][45853] [Tracking issue for
5577 further information][45852]
5578 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5579 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5580 Android 9, the minimum supported version is Android 14.
5581 - [Bumped the minimum LLVM to 3.9][45326]
5583 [44042]: https://github.com/rust-lang/rust/pull/44042
5584 [44932]: https://github.com/rust-lang/rust/pull/44932
5585 [45267]: https://github.com/rust-lang/rust/pull/45267
5586 [45324]: https://github.com/rust-lang/rust/pull/45324
5587 [45326]: https://github.com/rust-lang/rust/pull/45326
5588 [45333]: https://github.com/rust-lang/rust/pull/45333
5589 [45379]: https://github.com/rust-lang/rust/pull/45379
5590 [45380]: https://github.com/rust-lang/rust/pull/45380
5591 [45393]: https://github.com/rust-lang/rust/pull/45393
5592 [45435]: https://github.com/rust-lang/rust/pull/45435
5593 [45483]: https://github.com/rust-lang/rust/pull/45483
5594 [45524]: https://github.com/rust-lang/rust/pull/45524
5595 [45571]: https://github.com/rust-lang/rust/pull/45571
5596 [45580]: https://github.com/rust-lang/rust/pull/45580
5597 [45610]: https://github.com/rust-lang/rust/pull/45610
5598 [45660]: https://github.com/rust-lang/rust/pull/45660
5599 [45692]: https://github.com/rust-lang/rust/pull/45692
5600 [45711]: https://github.com/rust-lang/rust/pull/45711
5601 [45772]: https://github.com/rust-lang/rust/pull/45772
5602 [45852]: https://github.com/rust-lang/rust/issues/45852
5603 [45853]: https://github.com/rust-lang/rust/pull/45853
5604 [45887]: https://github.com/rust-lang/rust/pull/45887
5605 [45920]: https://github.com/rust-lang/rust/pull/45920
5606 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5607 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5608 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5611 Version 1.22.1 (2017-11-22)
5612 ==========================
5614 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5616 [46183]: https://github.com/rust-lang/rust/pull/46183
5618 Version 1.22.0 (2017-11-22)
5619 ==========================
5623 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5624 - [Now accepts underscores in unicode escapes][43716]
5625 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5626 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5630 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5631 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5632 This should decrease compile times for debug builds.
5633 - [strict memory alignment now enabled on ARMv6][45094]
5634 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5638 - [Allow atomic operations up to 32 bits
5639 on `armv5te_unknown_linux_gnueabi`][44978]
5640 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5641 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5642 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5643 - [Properly detect overflow in `Instant += Duration`.][44220]
5644 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5645 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5646 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5653 - [Cargo will now build multi file examples in subdirectories of the `examples`
5654 folder that have a `main.rs` file.][cargo/4496]
5655 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5656 the old format will continue to work and can be updated with `cargo update`.
5657 - [Now supports vendoring git repositories][cargo/3992]
5661 - [`libbacktrace` is now available on Apple platforms.][44251]
5662 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5663 This now lets you specify that a given code example will fail to compile.
5667 - [The minimum Android version that rustc can build for has been bumped
5668 to `4.0` from `2.3`][45656]
5669 - [Allowing `T op= &T` for numeric types has broken some type
5670 inference cases][45480]
5673 [42526]: https://github.com/rust-lang/rust/pull/42526
5674 [43716]: https://github.com/rust-lang/rust/pull/43716
5675 [43949]: https://github.com/rust-lang/rust/pull/43949
5676 [44015]: https://github.com/rust-lang/rust/pull/44015
5677 [44220]: https://github.com/rust-lang/rust/pull/44220
5678 [44251]: https://github.com/rust-lang/rust/pull/44251
5679 [44287]: https://github.com/rust-lang/rust/pull/44287
5680 [44303]: https://github.com/rust-lang/rust/pull/44303
5681 [44456]: https://github.com/rust-lang/rust/pull/44456
5682 [44466]: https://github.com/rust-lang/rust/pull/44466
5683 [44895]: https://github.com/rust-lang/rust/pull/44895
5684 [44966]: https://github.com/rust-lang/rust/pull/44966
5685 [44978]: https://github.com/rust-lang/rust/pull/44978
5686 [45041]: https://github.com/rust-lang/rust/pull/45041
5687 [45064]: https://github.com/rust-lang/rust/pull/45064
5688 [45075]: https://github.com/rust-lang/rust/pull/45075
5689 [45094]: https://github.com/rust-lang/rust/pull/45094
5690 [45095]: https://github.com/rust-lang/rust/pull/45095
5691 [45480]: https://github.com/rust-lang/rust/issues/45480
5692 [45656]: https://github.com/rust-lang/rust/pull/45656
5693 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5694 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5695 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5702 Version 1.21.0 (2017-10-12)
5703 ==========================
5707 - [You can now use static references for literals.][43838]
5711 let x: &'static u32 = &0;
5714 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5717 my_macro!(Vec<i32>::new); // Always worked
5718 my_macro!(Vec::<i32>::new); // Now works
5723 - [Upgraded jemalloc to 4.5.0][43911]
5724 - [Enabled unwinding panics on Redox][43917]
5725 - [Now runs LLVM in parallel during translation phase.][43506]
5726 This should reduce peak memory usage.
5730 - [Generate builtin impls for `Clone` for all arrays and tuples that
5731 are `T: Clone`][43690]
5732 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5733 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5734 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5739 [`std::mem::discriminant`]
5743 - [You can now call `cargo install` with multiple package names][cargo/4216]
5744 - [Cargo commands inside a virtual workspace will now implicitly
5745 pass `--all`][cargo/4335]
5746 - [Added a `[patch]` section to `Cargo.toml` to handle
5747 prepublication dependencies][cargo/4123] [RFC 1969]
5748 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5749 like patterns][cargo/4270]
5750 - [Added the `--all-targets` option][cargo/4400]
5751 - [Using required dependencies as a feature is now deprecated and emits
5752 a warning][cargo/4364]
5757 - [Cargo docs are moving][43916]
5758 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5759 - [The rustdoc book is now available][43863]
5760 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5761 - [Added a preview of RLS has been made available through rustup][44204]
5762 Install with `rustup component add rls-preview`
5763 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5764 Previously only showed `std::os::unix`.
5768 - [Changes in method matching against higher-ranked types][43880] This may cause
5769 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5770 - [rustc's JSON error output's byte position start at top of file.][42973]
5771 Was previously relative to the rustc's internal `CodeMap` struct which
5772 required the unstable library `libsyntax` to correctly use.
5773 - [`unused_results` lint no longer ignores booleans][43728]
5775 [42565]: https://github.com/rust-lang/rust/pull/42565
5776 [42973]: https://github.com/rust-lang/rust/pull/42973
5777 [43348]: https://github.com/rust-lang/rust/pull/43348
5778 [43459]: https://github.com/rust-lang/rust/pull/43459
5779 [43506]: https://github.com/rust-lang/rust/pull/43506
5780 [43540]: https://github.com/rust-lang/rust/pull/43540
5781 [43690]: https://github.com/rust-lang/rust/pull/43690
5782 [43728]: https://github.com/rust-lang/rust/pull/43728
5783 [43838]: https://github.com/rust-lang/rust/pull/43838
5784 [43863]: https://github.com/rust-lang/rust/pull/43863
5785 [43880]: https://github.com/rust-lang/rust/pull/43880
5786 [43911]: https://github.com/rust-lang/rust/pull/43911
5787 [43916]: https://github.com/rust-lang/rust/pull/43916
5788 [43917]: https://github.com/rust-lang/rust/pull/43917
5789 [44204]: https://github.com/rust-lang/rust/pull/44204
5790 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5791 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5792 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5793 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5794 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5795 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5796 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5797 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5798 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5800 Version 1.20.0 (2017-08-31)
5801 ===========================
5805 - [Associated constants are now stabilised.][42809]
5806 - [A lot of macro bugs are now fixed.][42913]
5811 - [Struct fields are now properly coerced to the expected field type.][42807]
5812 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5813 `wasm32-experimental-emscripten` target.
5814 - [Changed some of the error messages to be more helpful.][42033]
5815 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5817 - [rustc now reports the total number of errors on compilation failure][43015]
5818 previously this was only the number of errors in the pass that failed.
5819 - [Expansion in rustc has been sped up 29x.][42533]
5820 - [added `msp430-none-elf` target.][43099]
5821 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5823 - [Fixes backtraces on Redox][43228]
5824 - [rustc now identifies different versions of same crate when absolute paths of
5825 different types match in an error message.][42826]
5831 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5832 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5834 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5835 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5836 - [Impl `Clone` for `DefaultHasher`.][42799]
5837 - [Impl `Sync` for `SyncSender`.][42397]
5838 - [Impl `FromStr` for `char`][42271]
5839 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5841 - [allow messages in the `unimplemented!()` macro.][42155]
5842 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5843 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5844 - [Upgrade to Unicode 10.0.0][42999]
5845 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5846 - [Skip the main thread's manual stack guard on Linux][43072]
5847 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5848 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5850 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5855 - [`CStr::into_c_string`]
5856 - [`CString::as_c_str`]
5857 - [`CString::into_boxed_c_str`]
5858 - [`Chain::get_mut`]
5859 - [`Chain::get_ref`]
5860 - [`Chain::into_inner`]
5861 - [`Option::get_or_insert_with`]
5862 - [`Option::get_or_insert`]
5863 - [`OsStr::into_os_string`]
5864 - [`OsString::into_boxed_os_str`]
5867 - [`Utf8Error::error_len`]
5868 - [`char::EscapeDebug`]
5869 - [`char::escape_debug`]
5870 - [`compile_error!`]
5871 - [`f32::from_bits`]
5873 - [`f64::from_bits`]
5875 - [`mem::ManuallyDrop`]
5876 - [`slice::sort_unstable_by_key`]
5877 - [`slice::sort_unstable_by`]
5878 - [`slice::sort_unstable`]
5879 - [`str::from_boxed_utf8_unchecked`]
5880 - [`str::as_bytes_mut`]
5881 - [`str::as_bytes_mut`]
5882 - [`str::from_utf8_mut`]
5883 - [`str::from_utf8_unchecked_mut`]
5885 - [`str::get_unchecked_mut`]
5886 - [`str::get_unchecked`]
5888 - [`str::into_boxed_bytes`]
5893 - [Cargo API token location moved from `~/.cargo/config` to
5894 `~/.cargo/credentials`.][cargo/3978]
5895 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5896 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5897 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5898 - [You can now specify version of a binary when installed through
5899 `cargo install` using `--vers`.][cargo/4229]
5900 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5901 failure.][cargo/4248]
5902 - [Changed the convention around which file is the crate root.][cargo/4259]
5907 - [Functions with `'static` in their return types will now not be as usable as
5908 if they were using lifetime parameters instead.][42417]
5909 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5910 takes the sign of NaN into account where previously didn't.][42430]
5912 [42033]: https://github.com/rust-lang/rust/pull/42033
5913 [42155]: https://github.com/rust-lang/rust/pull/42155
5914 [42271]: https://github.com/rust-lang/rust/pull/42271
5915 [42397]: https://github.com/rust-lang/rust/pull/42397
5916 [42417]: https://github.com/rust-lang/rust/pull/42417
5917 [42430]: https://github.com/rust-lang/rust/pull/42430
5918 [42431]: https://github.com/rust-lang/rust/pull/42431
5919 [42533]: https://github.com/rust-lang/rust/pull/42533
5920 [42571]: https://github.com/rust-lang/rust/pull/42571
5921 [42613]: https://github.com/rust-lang/rust/pull/42613
5922 [42799]: https://github.com/rust-lang/rust/pull/42799
5923 [42807]: https://github.com/rust-lang/rust/pull/42807
5924 [42809]: https://github.com/rust-lang/rust/pull/42809
5925 [42822]: https://github.com/rust-lang/rust/pull/42822
5926 [42826]: https://github.com/rust-lang/rust/pull/42826
5927 [42854]: https://github.com/rust-lang/rust/pull/42854
5928 [42913]: https://github.com/rust-lang/rust/pull/42913
5929 [42999]: https://github.com/rust-lang/rust/pull/42999
5930 [43011]: https://github.com/rust-lang/rust/pull/43011
5931 [43015]: https://github.com/rust-lang/rust/pull/43015
5932 [43072]: https://github.com/rust-lang/rust/pull/43072
5933 [43077]: https://github.com/rust-lang/rust/pull/43077
5934 [43097]: https://github.com/rust-lang/rust/pull/43097
5935 [43099]: https://github.com/rust-lang/rust/pull/43099
5936 [43170]: https://github.com/rust-lang/rust/pull/43170
5937 [43178]: https://github.com/rust-lang/rust/pull/43178
5938 [43185]: https://github.com/rust-lang/rust/pull/43185
5939 [43228]: https://github.com/rust-lang/rust/pull/43228
5940 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5941 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5942 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5943 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5944 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5945 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5946 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5947 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5948 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5949 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5950 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5951 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5952 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5953 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5954 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5955 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5956 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5957 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5958 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5959 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5960 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5961 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5962 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5963 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5964 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5965 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5966 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5967 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5968 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5969 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5970 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5971 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5972 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5973 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5974 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5975 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5976 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5977 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5980 Version 1.19.0 (2017-07-20)
5981 ===========================
5986 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5987 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5988 - [Macro recursion limit increased to 1024 from 64.][41676]
5989 - [Added lint for detecting unused macros.][41907]
5990 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5991 For example: `let x = loop { break 7; };`
5992 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5993 contain `Copy` types and cannot have a `Drop` implementation.
5994 Example: `union Foo { bar: u8, baz: usize }`
5995 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5996 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6001 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6002 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6003 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6004 you should use `--target armv7-linux-androideabi`.
6005 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6006 - [Minor optimisation of string operations.][42037]
6007 - [Compiler error message is now `aborting due to previous error(s)` instead of
6008 `aborting due to N previous errors`][42150] This was previously inaccurate and
6009 would only count certain kinds of errors.
6010 - [The compiler now supports Visual Studio 2017][42225]
6011 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6012 - [Added a lot][42264] of [new error codes][42302]
6013 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6014 libraries with C Run-time Libraries(CRT) to be statically linked.
6015 - [Fixed various ARM codegen bugs][42740]
6020 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6021 `Extend<Cow<'a, str>>`][41449]
6022 - [`Vec` now implements `From<&mut [T]>`][41530]
6023 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6024 - [`SplitWhitespace` now implements `Clone`][41659]
6025 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6027 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6028 macros, but for printing to stderr.
6033 - [`OsString::shrink_to_fit`]
6036 - [`thread::ThreadId`]
6041 - [Build scripts can now add environment variables to the environment
6042 the crate is being compiled in.
6043 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6044 - [Subcommands now replace the current process rather than spawning a new
6045 child process][cargo/3970]
6046 - [Workspace members can now accept glob file patterns][cargo/3979]
6047 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6048 the members in a given workspace.][cargo/3988]
6049 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6050 - [Target directory path is now in the cargo metadata][cargo/4022]
6051 - [Cargo no longer checks out a local working directory for the
6052 crates.io index][cargo/4026] This should provide smaller file size for the
6053 registry, and improve cloning times, especially on Windows machines.
6054 - [Added an `--exclude` option for excluding certain packages when using the
6055 `--all` option][cargo/4031]
6056 - [Cargo will now automatically retry when receiving a 5xx error
6057 from crates.io][cargo/4032]
6058 - [The `--features` option now accepts multiple comma or space
6059 delimited values.][cargo/4084]
6060 - [Added support for custom target specific runners][cargo/3954]
6065 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6067 - [Rust will now release XZ compressed packages][rust-installer/57]
6068 - [rustup will now prefer to download rust packages with
6069 XZ compression][rustup/1100] over GZip packages.
6070 - [Added the ability to escape `#` in rust documentation][41785] By adding
6071 additional `#`'s ie. `##` is now `#`
6076 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6077 - [`-Z` flags are now no longer allowed to be used on the stable
6078 compiler.][41751] This has been a warning for a year previous to this.
6079 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6080 longer works][42844]. Users should migrate to the built-in `check`
6081 command, which has been available since 1.16.
6082 - [Ending a float literal with `._` is now a hard error.
6083 Example: `42._` .][41946]
6084 - [Any use of a private `extern crate` outside of its module is now a
6085 hard error.][36886] This was previously a warning.
6086 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6087 relative while the `::` prefix makes a path absolute, but was ignored and the
6088 path was relative regardless.
6089 - [Floating point constants in match patterns is now a hard error][36890]
6090 This was previously a warning.
6091 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6092 match patterns is now a hard error][36891] This was previously a warning.
6093 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6095 - [From the pound escape, lines consisting of multiple `#`s are
6097 - [It is an error to re-export private enum variants][42460]. This is
6098 known to break a number of crates that depend on an older version of
6100 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6101 to use it to find the linker, and the build will fail where it did
6102 not previously][42607]
6104 [36886]: https://github.com/rust-lang/rust/issues/36886
6105 [36888]: https://github.com/rust-lang/rust/issues/36888
6106 [36890]: https://github.com/rust-lang/rust/issues/36890
6107 [36891]: https://github.com/rust-lang/rust/issues/36891
6108 [36892]: https://github.com/rust-lang/rust/issues/36892
6109 [37406]: https://github.com/rust-lang/rust/issues/37406
6110 [39983]: https://github.com/rust-lang/rust/pull/39983
6111 [41145]: https://github.com/rust-lang/rust/pull/41145
6112 [41192]: https://github.com/rust-lang/rust/pull/41192
6113 [41258]: https://github.com/rust-lang/rust/pull/41258
6114 [41370]: https://github.com/rust-lang/rust/pull/41370
6115 [41449]: https://github.com/rust-lang/rust/pull/41449
6116 [41530]: https://github.com/rust-lang/rust/pull/41530
6117 [41624]: https://github.com/rust-lang/rust/pull/41624
6118 [41656]: https://github.com/rust-lang/rust/pull/41656
6119 [41659]: https://github.com/rust-lang/rust/pull/41659
6120 [41676]: https://github.com/rust-lang/rust/pull/41676
6121 [41751]: https://github.com/rust-lang/rust/pull/41751
6122 [41764]: https://github.com/rust-lang/rust/pull/41764
6123 [41785]: https://github.com/rust-lang/rust/pull/41785
6124 [41873]: https://github.com/rust-lang/rust/pull/41873
6125 [41907]: https://github.com/rust-lang/rust/pull/41907
6126 [41946]: https://github.com/rust-lang/rust/pull/41946
6127 [42016]: https://github.com/rust-lang/rust/pull/42016
6128 [42037]: https://github.com/rust-lang/rust/pull/42037
6129 [42068]: https://github.com/rust-lang/rust/pull/42068
6130 [42150]: https://github.com/rust-lang/rust/pull/42150
6131 [42162]: https://github.com/rust-lang/rust/pull/42162
6132 [42225]: https://github.com/rust-lang/rust/pull/42225
6133 [42264]: https://github.com/rust-lang/rust/pull/42264
6134 [42302]: https://github.com/rust-lang/rust/pull/42302
6135 [42460]: https://github.com/rust-lang/rust/issues/42460
6136 [42607]: https://github.com/rust-lang/rust/issues/42607
6137 [42740]: https://github.com/rust-lang/rust/pull/42740
6138 [42844]: https://github.com/rust-lang/rust/issues/42844
6139 [42948]: https://github.com/rust-lang/rust/pull/42948
6140 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6141 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6142 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6143 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6144 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6145 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6146 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6147 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6148 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6149 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6150 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6151 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6152 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6153 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6154 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6155 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6156 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6157 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6158 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6159 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6160 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6161 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6164 Version 1.18.0 (2017-06-08)
6165 ===========================
6170 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6171 make the item visible to just that module tree. Also accepts the keyword
6172 `crate` to make something public to the whole crate but not users of the
6173 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6174 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6175 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6176 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6177 types like `Write + Send`, trailing `+` are now supported in trait objects,
6178 and better error reporting for trait objects starting with `?Sized`.
6179 - [0e+10 is now a valid floating point literal][40589]
6180 - [Now warns if you bind a lifetime parameter to 'static][40734]
6181 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6182 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6183 representation in some cases.][40377]
6188 - [rustc can now emit mir with `--emit mir`][39891]
6189 - [Improved LLVM IR for trivial functions][40367]
6190 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6191 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6192 opportunities found through profiling
6193 - [Improved backtrace formatting when panicking][38165]
6198 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6199 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6200 iteration or reallocation.
6201 - [Simplified HashMap Bucket interface][40561] provides performance
6202 improvements for iterating and cloning.
6203 - [Specialize Vec::from_elem to use calloc][40409]
6204 - [Fixed Race condition in fs::create_dir_all][39799]
6205 - [No longer caching stdio on Windows][40516]
6206 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6207 2.50%~ faster and in one case now 12.50% faster.
6208 - [Optimized `AtomicBool::fetch_nand`][41143]
6213 - [`Child::try_wait`]
6214 - [`HashMap::retain`]
6215 - [`HashSet::retain`]
6217 - [`TcpStream::peek`]
6218 - [`UdpSocket::peek`]
6219 - [`UdpSocket::peek_from`]
6224 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6225 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6226 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6227 - [Added Android build support][cargo/3885]
6228 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6229 of a certain type, for example `cargo build --bins` will build all
6231 - [Added support for haiku][cargo/3952]
6236 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6237 - [Rust now uses the official cross compiler for NetBSD][40612]
6238 - [rustdoc now accepts `#` at the start of files][40828]
6239 - [Fixed jemalloc support for musl][41168]
6244 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6245 always placed after the sign if it exists and before the digits. With the `#`
6246 flag the zeroes are placed after the prefix and before the digits.
6247 - [Due to the struct field optimisation][40377], using `transmute` on structs
6248 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6249 always been undefined behavior, but is now more likely to break in practice.
6250 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6251 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6252 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6253 - [Overlapping inherent `impl`s are now a hard error][40728]
6254 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6255 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6256 `out.asm` and `out.ll` instead of only one of the filetypes.
6257 - [ calling a function that returns `Self` will no longer work][41805] when
6258 the size of `Self` cannot be statically determined.
6259 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6260 this has caused a few regressions namely:
6262 - Changed the link order of local static/dynamic libraries (respecting the
6263 order on given rather than having the compiler reorder).
6264 - Changed how MinGW is linked, native code linked to dynamic libraries
6265 may require manually linking to the gcc support library (for the native
6268 [38165]: https://github.com/rust-lang/rust/pull/38165
6269 [39799]: https://github.com/rust-lang/rust/pull/39799
6270 [39891]: https://github.com/rust-lang/rust/pull/39891
6271 [40043]: https://github.com/rust-lang/rust/pull/40043
6272 [40241]: https://github.com/rust-lang/rust/pull/40241
6273 [40338]: https://github.com/rust-lang/rust/pull/40338
6274 [40367]: https://github.com/rust-lang/rust/pull/40367
6275 [40377]: https://github.com/rust-lang/rust/pull/40377
6276 [40409]: https://github.com/rust-lang/rust/pull/40409
6277 [40516]: https://github.com/rust-lang/rust/pull/40516
6278 [40556]: https://github.com/rust-lang/rust/pull/40556
6279 [40561]: https://github.com/rust-lang/rust/pull/40561
6280 [40589]: https://github.com/rust-lang/rust/pull/40589
6281 [40612]: https://github.com/rust-lang/rust/pull/40612
6282 [40723]: https://github.com/rust-lang/rust/pull/40723
6283 [40728]: https://github.com/rust-lang/rust/pull/40728
6284 [40731]: https://github.com/rust-lang/rust/pull/40731
6285 [40734]: https://github.com/rust-lang/rust/pull/40734
6286 [40805]: https://github.com/rust-lang/rust/pull/40805
6287 [40807]: https://github.com/rust-lang/rust/pull/40807
6288 [40828]: https://github.com/rust-lang/rust/pull/40828
6289 [40870]: https://github.com/rust-lang/rust/pull/40870
6290 [41085]: https://github.com/rust-lang/rust/pull/41085
6291 [41143]: https://github.com/rust-lang/rust/pull/41143
6292 [41168]: https://github.com/rust-lang/rust/pull/41168
6293 [41270]: https://github.com/rust-lang/rust/issues/41270
6294 [41469]: https://github.com/rust-lang/rust/pull/41469
6295 [41805]: https://github.com/rust-lang/rust/issues/41805
6296 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6297 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6298 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6299 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6300 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6301 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6302 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6303 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6304 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6305 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6306 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6307 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6308 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6309 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6312 Version 1.17.0 (2017-04-27)
6313 ===========================
6318 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6319 * [Fields of structs may be initialized without duplicating the field/variable
6320 names][39761]. [RFC 1682]
6321 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6322 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6323 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6324 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6325 `'b`. Soundness fix.
6326 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6327 * [Static variables may contain references to other statics][40027]
6332 * [Exit quickly on only `--emit dep-info`][40336]
6333 * [Make `-C relocation-model` more correctly determine whether the linker
6334 creates a position-independent executable][40245]
6335 * [Add `-C overflow-checks` to directly control whether integer overflow
6337 * [The rustc type checker now checks items on demand instead of in a single
6338 in-order pass][40008]. This is mostly an internal refactoring in support of
6339 future work, including incremental type checking, but also resolves [RFC
6340 1647], allowing `Self` to appear in `impl` `where` clauses.
6341 * [Optimize vtable loads][39995]
6342 * [Turn off vectorization for Emscripten targets][39990]
6343 * [Provide suggestions for unknown macros imported with `use`][39953]
6344 * [Fix ICEs in path resolution][39939]
6345 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6346 * [Add clearer error message using `&str + &str`][39116]
6357 * [`Ordering::then`]
6358 * [`Ordering::then_with`]
6359 * [`BTreeMap::range`]
6360 * [`BTreeMap::range_mut`]
6361 * [`collections::Bound`]
6362 * [`process::abort`]
6363 * [`ptr::read_unaligned`]
6364 * [`ptr::write_unaligned`]
6365 * [`Result::expect_err`]
6368 * [`Cell::into_inner`]
6374 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6375 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6376 * [`String` implements `FromIterator<&char>`][40028]
6377 * `Box` [implements][40009] a number of new conversions:
6378 `From<Box<str>> for String`,
6379 `From<Box<[T]>> for Vec<T>`,
6380 `From<Box<CStr>> for CString`,
6381 `From<Box<OsStr>> for OsString`,
6382 `From<Box<Path>> for PathBuf`,
6383 `Into<Box<str>> for String`,
6384 `Into<Box<[T]>> for Vec<T>`,
6385 `Into<Box<CStr>> for CString`,
6386 `Into<Box<OsStr>> for OsString`,
6387 `Into<Box<Path>> for PathBuf`,
6388 `Default for Box<str>`,
6389 `Default for Box<CStr>`,
6390 `Default for Box<OsStr>`,
6391 `From<&CStr> for Box<CStr>`,
6392 `From<&OsStr> for Box<OsStr>`,
6393 `From<&Path> for Box<Path>`
6394 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6395 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6396 * [Slightly optimize `slice::sort`][39538]
6397 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6398 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6399 `Box<str>` implements `From<&str>`][39438]
6400 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6401 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6402 * [`format!` estimates the needed capacity before writing a string][39356]
6403 * [Support unprivileged symlink creation in Windows][38921]
6404 * [`PathBuf` implements `Default`][38764]
6405 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6406 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6407 and poor hash functions.
6412 * [Add `cargo check --all`][cargo/3731]
6413 * [Add an option to ignore SSL revocation checking][cargo/3699]
6414 * [Add `cargo run --package`][cargo/3691]
6415 * [Add `required_features`][cargo/3667]
6416 * [Assume `build.rs` is a build script][cargo/3664]
6417 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6422 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6424 * [The "Unstable Book" documents nightly-only features][ubook]
6425 * [Improve the style of the sidebar in rustdoc output][40265]
6426 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6427 * [Fix MSP430 breakage due to `i128`][40257]
6428 * [Preliminary Solaris/SPARCv9 support][39903]
6429 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6430 run without installing the MSVC runtime.
6431 * [`rustdoc --test` includes file names in test names][39788]
6432 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6433 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6434 * [Initial support for `aarch64-unknown-freebsd`][39491]
6435 * [Initial support for `i686-unknown-netbsd`][39426]
6436 * [This release no longer includes the old makefile build system][39431]. Rust
6437 is built with a custom build system, written in Rust, and with Cargo.
6438 * [Add Debug implementations for libcollection structs][39002]
6439 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6440 * [`--test-threads=0` produces an error][38945]
6441 * [`rustup` installs documentation by default][40526]
6442 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6443 WinDbg and Visual Studio to improve the debugging experience.
6448 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6449 workaround, either use MSVC 2015 or run vcvars.bat.
6450 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6451 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6452 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6454 * [`format!` and `Display::to_string` panic if an underlying formatting
6455 implementation returns an error][40117]. Previously the error was silently
6456 ignored. It is incorrect for `write_fmt` to return an error when writing
6458 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6459 crates were marked stable and could be accessed from the stable toolchain.
6460 * [Rust git source no longer includes vendored crates][39728]. Those that need
6461 to build with vendored crates should build from release tarballs.
6462 * [Fix inert attributes from `proc_macro_derives`][39572]
6463 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6464 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6466 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6467 existing code generally ignores the type of dead-code unless a type-hint is
6468 provided; this can cause surprising inference interactions particularly around
6469 defaulting. The new code uniformly ignores the result type of dead-code.
6470 * [Tuple-struct constructors with private fields are no longer visible][38932]
6471 * [Lifetime parameters that do not appear in the arguments are now considered
6472 early-bound][38897], resolving a soundness bug (#[32330]). The
6473 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6475 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6476 * [Make transmuting from fn item types to pointer-sized types a hard
6479 [27787]: https://github.com/rust-lang/rust/issues/27787
6480 [32330]: https://github.com/rust-lang/rust/issues/32330
6481 [34198]: https://github.com/rust-lang/rust/pull/34198
6482 [38161]: https://github.com/rust-lang/rust/pull/38161
6483 [38368]: https://github.com/rust-lang/rust/pull/38368
6484 [38584]: https://github.com/rust-lang/rust/issues/38584
6485 [38661]: https://github.com/rust-lang/rust/pull/38661
6486 [38764]: https://github.com/rust-lang/rust/pull/38764
6487 [38864]: https://github.com/rust-lang/rust/issues/38864
6488 [38897]: https://github.com/rust-lang/rust/pull/38897
6489 [38921]: https://github.com/rust-lang/rust/pull/38921
6490 [38932]: https://github.com/rust-lang/rust/pull/38932
6491 [38945]: https://github.com/rust-lang/rust/pull/38945
6492 [38981]: https://github.com/rust-lang/rust/pull/38981
6493 [39002]: https://github.com/rust-lang/rust/pull/39002
6494 [39116]: https://github.com/rust-lang/rust/pull/39116
6495 [39193]: https://github.com/rust-lang/rust/pull/39193
6496 [39265]: https://github.com/rust-lang/rust/pull/39265
6497 [39356]: https://github.com/rust-lang/rust/pull/39356
6498 [39372]: https://github.com/rust-lang/rust/pull/39372
6499 [39426]: https://github.com/rust-lang/rust/pull/39426
6500 [39431]: https://github.com/rust-lang/rust/pull/39431
6501 [39438]: https://github.com/rust-lang/rust/pull/39438
6502 [39440]: https://github.com/rust-lang/rust/pull/39440
6503 [39485]: https://github.com/rust-lang/rust/pull/39485
6504 [39491]: https://github.com/rust-lang/rust/pull/39491
6505 [39518]: https://github.com/rust-lang/rust/pull/39518
6506 [39538]: https://github.com/rust-lang/rust/pull/39538
6507 [39572]: https://github.com/rust-lang/rust/pull/39572
6508 [39633]: https://github.com/rust-lang/rust/pull/39633
6509 [39642]: https://github.com/rust-lang/rust/pull/39642
6510 [39728]: https://github.com/rust-lang/rust/pull/39728
6511 [39761]: https://github.com/rust-lang/rust/pull/39761
6512 [39788]: https://github.com/rust-lang/rust/pull/39788
6513 [39793]: https://github.com/rust-lang/rust/pull/39793
6514 [39837]: https://github.com/rust-lang/rust/pull/39837
6515 [39843]: https://github.com/rust-lang/rust/pull/39843
6516 [39851]: https://github.com/rust-lang/rust/pull/39851
6517 [39903]: https://github.com/rust-lang/rust/pull/39903
6518 [39939]: https://github.com/rust-lang/rust/pull/39939
6519 [39953]: https://github.com/rust-lang/rust/pull/39953
6520 [39960]: https://github.com/rust-lang/rust/pull/39960
6521 [39990]: https://github.com/rust-lang/rust/pull/39990
6522 [39995]: https://github.com/rust-lang/rust/pull/39995
6523 [40008]: https://github.com/rust-lang/rust/pull/40008
6524 [40009]: https://github.com/rust-lang/rust/pull/40009
6525 [40027]: https://github.com/rust-lang/rust/pull/40027
6526 [40028]: https://github.com/rust-lang/rust/pull/40028
6527 [40037]: https://github.com/rust-lang/rust/pull/40037
6528 [40117]: https://github.com/rust-lang/rust/pull/40117
6529 [40166]: https://github.com/rust-lang/rust/pull/40166
6530 [40245]: https://github.com/rust-lang/rust/pull/40245
6531 [40257]: https://github.com/rust-lang/rust/pull/40257
6532 [40261]: https://github.com/rust-lang/rust/pull/40261
6533 [40265]: https://github.com/rust-lang/rust/pull/40265
6534 [40319]: https://github.com/rust-lang/rust/pull/40319
6535 [40336]: https://github.com/rust-lang/rust/pull/40336
6536 [40526]: https://github.com/rust-lang/rust/pull/40526
6537 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6538 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6539 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6540 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6541 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6542 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6543 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6544 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6545 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6546 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6547 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6548 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6549 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6550 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6551 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6552 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6553 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6554 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6555 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6556 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6557 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6558 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6559 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6560 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6561 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6562 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6563 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6564 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6565 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6566 [ubook]: https://doc.rust-lang.org/unstable-book/
6569 Version 1.16.0 (2017-03-16)
6570 ===========================
6575 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6576 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6577 match patterns][38069]
6578 * [Clean up semantics of `self` in an import list][38313]
6579 * [`Self` may appear in `impl` headers][38920]
6580 * [`Self` may appear in struct expressions][39282]
6585 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6586 a `.rmeta` file containing only crate metadata][38571]. This can be
6587 used by tools like the Rust Language Service to perform
6588 metadata-only builds.
6589 * [Levenshtein based typo suggestions now work in most places, while
6590 previously they worked only for fields and sometimes for local
6591 variables][38927]. Together with the overhaul of "no
6592 resolution"/"unexpected resolution" errors (#[38154]) they result in
6593 large and systematic improvement in resolution diagnostics.
6594 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6596 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6597 * [`rustc` no longer attempts to provide "consider using an explicit
6598 lifetime" suggestions][37057]. They were inaccurate.
6603 * [`VecDeque::truncate`]
6604 * [`VecDeque::resize`]
6605 * [`String::insert_str`]
6606 * [`Duration::checked_add`]
6607 * [`Duration::checked_sub`]
6608 * [`Duration::checked_div`]
6609 * [`Duration::checked_mul`]
6612 * [`SocketAddr::is_ipv4`]
6613 * [`SocketAddr::is_ipv6`]
6614 * [`IpAddr::is_ipv4`]
6615 * [`IpAddr::is_ipv6`]
6617 * [`Vec::dedup_by_key`]
6618 * [`Result::unwrap_or_default`]
6619 * [`<*const T>::wrapping_offset`]
6620 * [`<*mut T>::wrapping_offset`]
6621 * `CommandExt::creation_flags`
6622 * [`File::set_permissions`]
6623 * [`String::split_off`]
6628 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6629 their argument by `Borrow` parameter][37761]
6630 * [All public types in std implement `Debug`][38006]
6631 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6632 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6633 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6635 * [std: Fix partial writes in `LineWriter`][38062]
6636 * [std: Clamp max read/write sizes on Unix][38622]
6637 * [Use more specific panic message for `&str` slicing errors][38066]
6638 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6639 functionality cannot be achieved in std currently.
6640 * [`writeln!`, like `println!`, now accepts a form with no string
6641 or formatting arguments, to just print a newline][38469]
6642 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6643 * [Reduce the size of static data in `std_unicode::tables`][38781]
6644 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6645 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6647 * [`Duration` implements `Sum`][38712]
6648 * [`String` implements `ToSocketAddrs`][39048]
6653 * [The `cargo check` command does a type check of a project without
6654 building it][cargo/3296]
6655 * [crates.io will display CI badges from Travis and AppVeyor, if
6656 specified in Cargo.toml][cargo/3546]
6657 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6658 * [Compilation profiles accept integer values for `debug`, in addition
6659 to `true` and `false`. These are passed to `rustc` as the value to
6660 `-C debuginfo`][cargo/3534]
6661 * [Implement `cargo --version --verbose`][cargo/3604]
6662 * [All builds now output 'dep-info' build dependencies compatible with
6663 make and ninja][cargo/3557]
6664 * [Build all workspace members with `build --all`][cargo/3511]
6665 * [Document all workspace members with `doc --all`][cargo/3515]
6666 * [Path deps outside workspace are not members][cargo/3443]
6671 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6672 the path to the Rust implementation][38589]
6673 * [The `armv7-linux-androideabi` target no longer enables NEON
6674 extensions, per Google's ABI guide][38413]
6675 * [The stock standard library can be compiled for Redox OS][38401]
6676 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6678 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6680 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6685 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6686 match patterns][38069]
6687 * In this release, references to uninhabited types can not be
6688 pattern-matched. This was accidentally allowed in 1.15.
6689 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6690 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6692 * [Clean up semantics of `self` in an import list][38313]
6693 * Reimplemented lifetime elision. This change was almost entirely compatible
6694 with existing code, but it did close a number of small bugs and loopholes,
6695 as well as being more accepting in some other [cases][41105].
6697 [37057]: https://github.com/rust-lang/rust/pull/37057
6698 [37761]: https://github.com/rust-lang/rust/pull/37761
6699 [38006]: https://github.com/rust-lang/rust/pull/38006
6700 [38051]: https://github.com/rust-lang/rust/pull/38051
6701 [38062]: https://github.com/rust-lang/rust/pull/38062
6702 [38622]: https://github.com/rust-lang/rust/pull/38622
6703 [38066]: https://github.com/rust-lang/rust/pull/38066
6704 [38069]: https://github.com/rust-lang/rust/pull/38069
6705 [38131]: https://github.com/rust-lang/rust/pull/38131
6706 [38154]: https://github.com/rust-lang/rust/pull/38154
6707 [38274]: https://github.com/rust-lang/rust/pull/38274
6708 [38304]: https://github.com/rust-lang/rust/pull/38304
6709 [38313]: https://github.com/rust-lang/rust/pull/38313
6710 [38327]: https://github.com/rust-lang/rust/pull/38327
6711 [38401]: https://github.com/rust-lang/rust/pull/38401
6712 [38413]: https://github.com/rust-lang/rust/pull/38413
6713 [38469]: https://github.com/rust-lang/rust/pull/38469
6714 [38559]: https://github.com/rust-lang/rust/pull/38559
6715 [38571]: https://github.com/rust-lang/rust/pull/38571
6716 [38580]: https://github.com/rust-lang/rust/pull/38580
6717 [38589]: https://github.com/rust-lang/rust/pull/38589
6718 [38670]: https://github.com/rust-lang/rust/pull/38670
6719 [38712]: https://github.com/rust-lang/rust/pull/38712
6720 [38726]: https://github.com/rust-lang/rust/pull/38726
6721 [38781]: https://github.com/rust-lang/rust/pull/38781
6722 [38798]: https://github.com/rust-lang/rust/pull/38798
6723 [38909]: https://github.com/rust-lang/rust/pull/38909
6724 [38920]: https://github.com/rust-lang/rust/pull/38920
6725 [38927]: https://github.com/rust-lang/rust/pull/38927
6726 [39048]: https://github.com/rust-lang/rust/pull/39048
6727 [39282]: https://github.com/rust-lang/rust/pull/39282
6728 [39379]: https://github.com/rust-lang/rust/pull/39379
6729 [41105]: https://github.com/rust-lang/rust/issues/41105
6730 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6731 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6732 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6733 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6734 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6735 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6736 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6737 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6738 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6739 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6740 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6741 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6742 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6743 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6744 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6745 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6746 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6747 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6748 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6749 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6750 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6751 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6752 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6753 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6754 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6755 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6756 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6757 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6758 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6761 Version 1.15.1 (2017-02-09)
6762 ===========================
6764 * [Fix IntoIter::as_mut_slice's signature][39466]
6765 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6767 [39466]: https://github.com/rust-lang/rust/pull/39466
6768 [39523]: https://github.com/rust-lang/rust/pull/39523
6771 Version 1.15.0 (2017-02-02)
6772 ===========================
6777 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6778 stable. This allows popular code-generating crates like Serde and Diesel to
6779 work ergonomically. [RFC 1681].
6780 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6781 with curly braces][36868]. Part of [RFC 1506].
6782 * [A number of minor changes to name resolution have been activated][37127].
6783 They add up to more consistent semantics, allowing for future evolution of
6784 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6785 details of what is different. The breaking changes here have been transitioned
6786 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6787 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6789 * [`?Sized` can be used in `where` clauses][37791]
6790 * [There is now a limit on the size of monomorphized types and it can be
6791 modified with the `#![type_size_limit]` crate attribute, similarly to
6792 the `#![recursion_limit]` attribute][37789]
6797 * [On Windows, the compiler will apply dllimport attributes when linking to
6798 extern functions][37973]. Additional attributes and flags can control which
6799 library kind is linked and its name. [RFC 1717].
6800 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6801 * [The `--test` flag works with procedural macro crates][38107]
6802 * [Fix `extern "aapcs" fn` ABI][37814]
6803 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6804 * [The `format!` expander recognizes incorrect `printf` and shell-style
6805 formatting directives and suggests the correct format][37613].
6806 * [Only report one error for all unused imports in an import list][37456]
6808 Compiler Performance
6809 --------------------
6811 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6812 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6813 * [Don't clone in `UnificationTable::probe`][37848]
6814 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6815 * [Use small vectors in type walker][37760]
6816 * [Macro expansion performance was improved][37701]
6817 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6818 * [Replace FNV with a faster hash function][37229]
6823 * [`std::iter::Iterator::min_by`]
6824 * [`std::iter::Iterator::max_by`]
6825 * [`std::os::*::fs::FileExt`]
6826 * [`std::sync::atomic::Atomic*::get_mut`]
6827 * [`std::sync::atomic::Atomic*::into_inner`]
6828 * [`std::vec::IntoIter::as_slice`]
6829 * [`std::vec::IntoIter::as_mut_slice`]
6830 * [`std::sync::mpsc::Receiver::try_iter`]
6831 * [`std::os::unix::process::CommandExt::before_exec`]
6832 * [`std::rc::Rc::strong_count`]
6833 * [`std::rc::Rc::weak_count`]
6834 * [`std::sync::Arc::strong_count`]
6835 * [`std::sync::Arc::weak_count`]
6836 * [`std::char::encode_utf8`]
6837 * [`std::char::encode_utf16`]
6838 * [`std::cell::Ref::clone`]
6839 * [`std::io::Take::into_inner`]
6844 * [The standard sorting algorithm has been rewritten for dramatic performance
6845 improvements][38192]. It is a hybrid merge sort, drawing influences from
6846 Timsort. Previously it was a naive merge sort.
6847 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6848 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6850 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6851 and `char_indices().last()`][37882]
6852 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6853 * [Chinese characters display correctly in `fmt::Debug`][37855]
6854 * [Derive `Default` for `Duration`][37699]
6855 * [Support creation of anonymous pipes on WinXP/2k][37677]
6856 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6857 * [Don't pass overlapped handles to processes][38835]
6862 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6863 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6864 should instead check the variable at runtime with `std::env`. That the value
6865 was set at build time was a bug, and incorrect when cross-compiling. This
6866 change is known to cause breakage.
6867 * [Add `--all` flag to `cargo test`][cargo/3221]
6868 * [Compile statically against the MSVC CRT][cargo/3363]
6869 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6870 * [Link OpenSSL statically on OSX][cargo/3311]
6871 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6872 * [Test for bad path overrides with summaries][cargo/3336]
6873 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6874 * [Fix retrying crate downloads for network errors][cargo/3348]
6875 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6876 * [Emit more info on --message-format=json][cargo/3319]
6877 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6878 * [Don't ignore errors in workspace manifest][cargo/3409]
6879 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6884 * [Test runners (binaries built with `--test`) now support a `--list` argument
6885 that lists the tests it contains][38185]
6886 * [Test runners now support a `--exact` argument that makes the test filter
6887 match exactly, instead of matching only a substring of the test name][38181]
6888 * [rustdoc supports a `--playground-url` flag][37763]
6889 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6894 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6895 continue to be used in this release by passing `--disable-rustbuild` to the
6896 configure script, but they will be deleted soon. Note that the new build
6897 system uses a different on-disk layout that will likely affect any scripts
6899 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6901 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6902 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6908 * [A number of minor changes to name resolution have been activated][37127].
6909 They add up to more consistent semantics, allowing for future evolution of
6910 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6911 details of what is different. The breaking changes here have been transitioned
6912 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6913 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6914 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6915 should instead check the variable at runtime with `std::env`. That the value
6916 was set at build time was a bug, and incorrect when cross-compiling. This
6917 change is known to cause breakage.
6918 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6919 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6920 1.10 and is now an error by default. It will become a hard error in the near
6922 * [The semantics relating modules to file system directories are changing in
6923 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6924 lint, which is a warning in this release, and will become a hard error in the
6926 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6927 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6928 the underlying iterator][37834]
6930 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6931 [33685]: https://github.com/rust-lang/rust/issues/33685
6932 [36868]: https://github.com/rust-lang/rust/pull/36868
6933 [37127]: https://github.com/rust-lang/rust/pull/37127
6934 [37229]: https://github.com/rust-lang/rust/pull/37229
6935 [37456]: https://github.com/rust-lang/rust/pull/37456
6936 [37527]: https://github.com/rust-lang/rust/pull/37527
6937 [37602]: https://github.com/rust-lang/rust/pull/37602
6938 [37613]: https://github.com/rust-lang/rust/pull/37613
6939 [37615]: https://github.com/rust-lang/rust/pull/37615
6940 [37636]: https://github.com/rust-lang/rust/pull/37636
6941 [37627]: https://github.com/rust-lang/rust/pull/37627
6942 [37642]: https://github.com/rust-lang/rust/pull/37642
6943 [37677]: https://github.com/rust-lang/rust/pull/37677
6944 [37699]: https://github.com/rust-lang/rust/pull/37699
6945 [37701]: https://github.com/rust-lang/rust/pull/37701
6946 [37705]: https://github.com/rust-lang/rust/pull/37705
6947 [37749]: https://github.com/rust-lang/rust/pull/37749
6948 [37760]: https://github.com/rust-lang/rust/pull/37760
6949 [37763]: https://github.com/rust-lang/rust/pull/37763
6950 [37764]: https://github.com/rust-lang/rust/pull/37764
6951 [37789]: https://github.com/rust-lang/rust/pull/37789
6952 [37791]: https://github.com/rust-lang/rust/pull/37791
6953 [37814]: https://github.com/rust-lang/rust/pull/37814
6954 [37817]: https://github.com/rust-lang/rust/pull/37817
6955 [37834]: https://github.com/rust-lang/rust/pull/37834
6956 [37848]: https://github.com/rust-lang/rust/pull/37848
6957 [37855]: https://github.com/rust-lang/rust/pull/37855
6958 [37882]: https://github.com/rust-lang/rust/pull/37882
6959 [37888]: https://github.com/rust-lang/rust/pull/37888
6960 [37973]: https://github.com/rust-lang/rust/pull/37973
6961 [37979]: https://github.com/rust-lang/rust/pull/37979
6962 [38086]: https://github.com/rust-lang/rust/pull/38086
6963 [38107]: https://github.com/rust-lang/rust/pull/38107
6964 [38117]: https://github.com/rust-lang/rust/pull/38117
6965 [38134]: https://github.com/rust-lang/rust/pull/38134
6966 [38146]: https://github.com/rust-lang/rust/pull/38146
6967 [38181]: https://github.com/rust-lang/rust/pull/38181
6968 [38182]: https://github.com/rust-lang/rust/pull/38182
6969 [38185]: https://github.com/rust-lang/rust/pull/38185
6970 [38192]: https://github.com/rust-lang/rust/pull/38192
6971 [38279]: https://github.com/rust-lang/rust/pull/38279
6972 [38835]: https://github.com/rust-lang/rust/pull/38835
6973 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6974 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6975 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6976 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6977 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6978 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6979 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6980 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6981 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6982 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6983 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6984 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6985 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6986 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6987 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6988 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6989 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6990 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6991 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6992 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6993 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6994 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6995 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6996 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6997 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6998 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6999 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7000 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7001 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7002 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7003 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7004 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7005 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7006 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7007 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7008 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7009 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7012 Version 1.14.0 (2016-12-22)
7013 ===========================
7018 * [`..` matches multiple tuple fields in enum variants, structs
7019 and tuples][36843]. [RFC 1492].
7020 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7021 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7022 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7023 dereferencing][36822]
7028 * [Mark enums with non-zero discriminant as non-zero][37224]
7029 * [Lower-case `static mut` names are linted like other
7030 statics and consts][37162]
7031 * [Fix ICE on some macros in const integer positions
7032 (e.g. `[u8; m!()]`)][36819]
7033 * [Improve error message and snippet for "did you mean `x`"][36798]
7034 * [Add a panic-strategy field to the target specification][36794]
7035 * [Include LLVM version in `--version --verbose`][37200]
7037 Compile-time Optimizations
7038 --------------------------
7040 * [Improve macro expansion performance][37569]
7041 * [Shrink `Expr_::ExprInlineAsm`][37445]
7042 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7043 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7044 * [Avoid more allocations when compiling html5ever][37373]
7045 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7046 * [Avoid some allocations in the macro parser][37318]
7047 * [Use a faster deflate setting][37298]
7048 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7049 during interning of slices][37270]
7050 * [Optimize `write_metadata`][37267]
7051 * [Don't process obligation forest cycles when stalled][37231]
7052 * [Avoid many `CrateConfig` clones][37161]
7053 * [Optimize `Substs::super_fold_with`][37108]
7054 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7055 * [Speed up `plug_leaks`][36917]
7060 * [`println!()`, with no arguments, prints newline][36825].
7061 Previously, an empty string was required to achieve the same.
7062 * [`Wrapping` impls standard binary and unary operators, as well as
7063 the `Sum` and `Product` iterators][37356]
7064 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7066 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7067 `VecDeque` iterators][37315]
7068 * [Improve `SipHasher` performance on small values][37312]
7069 * [Add Iterator trait TrustedLen to enable better FromIterator /
7071 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7072 * [`ReadDir` implements `Debug`][37221]
7073 * [Implement `RefUnwindSafe` for atomic types][37178]
7074 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7075 * [Avoid allocations in `Decoder::read_str`][37064]
7076 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7077 * [Impl `Debug` for raw pointers to unsized data][36880]
7078 * [Don't reuse `HashMap` random seeds][37470]
7079 * [The internal memory layout of `HashMap` is more cache-friendly, for
7080 significant improvements in some operations][36692]
7081 * [`HashMap` uses less memory on 32-bit architectures][36595]
7082 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7087 * [Expose rustc cfg values to build scripts][cargo/3243]
7088 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7089 * [Fix passing --features when testing multiple packages][cargo/3280]
7090 * [Use a single profile set per workspace][cargo/3249]
7091 * [Load `replace` sections from lock files][cargo/3220]
7092 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7097 * [rustup is the recommended Rust installation method][1.14rustup]
7098 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7099 S390x. These are [tier 2] platforms and may have major defects. Follow the
7100 instructions on the website to install, or add the targets to an existing
7101 installation with `rustup target add`. The new target triples are:
7102 - `mips-unknown-linux-gnu`
7103 - `mipsel-unknown-linux-gnu`
7104 - `mips64-unknown-linux-gnuabi64`
7105 - `mips64el-unknown-linux-gnuabi64 `
7106 - `powerpc-unknown-linux-gnu`
7107 - `powerpc64-unknown-linux-gnu`
7108 - `powerpc64le-unknown-linux-gnu`
7109 - `s390x-unknown-linux-gnu `
7110 * This release includes target (std) builds for ARM Linux running MUSL
7111 libc. These are [tier 2] platforms and may have major defects. Add the
7112 following triples to an existing rustup installation with `rustup target add`:
7113 - `arm-unknown-linux-musleabi`
7114 - `arm-unknown-linux-musleabihf`
7115 - `armv7-unknown-linux-musleabihf`
7116 * This release includes [experimental support for WebAssembly][1.14wasm], via
7117 the `wasm32-unknown-emscripten` target. This target is known to have major
7118 defects. Please test, report, and fix.
7119 * rustup no longer installs documentation by default. Run `rustup
7120 component add rust-docs` to install.
7121 * [Fix line stepping in debugger][37310]
7122 * [Enable line number debuginfo in releases][37280]
7127 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7128 * [Add support for Fuchsia OS][37313]
7129 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7134 * [A number of forward-compatibility lints used by the compiler
7135 to gradually introduce language changes have been converted
7136 to deny by default][36894]:
7137 - ["use of inaccessible extern crate erroneously allowed"][36886]
7138 - ["type parameter default erroneously allowed in invalid location"][36887]
7139 - ["detects super or self keywords at the beginning of global path"][36888]
7140 - ["two overlapping inherent impls define an item with the same name
7141 were erroneously allowed"][36889]
7142 - ["floating-point constants cannot be used in patterns"][36890]
7143 - ["constants of struct or enum type can only be used in a pattern if
7144 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7145 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7146 * [Prohibit patterns in trait methods without bodies][37378]
7147 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7148 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7149 * [The `$crate` macro variable is accepted in fewer locations][37213]
7150 * [Impls specifying extra region requirements beyond the trait
7151 they implement are rejected][37167]
7152 * [Enums may not be unsized][37111]. Unsized enums are intended to
7153 work but never have. For now they are forbidden.
7154 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7156 [tier 2]: https://forge.rust-lang.org/platform-support.html
7157 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7158 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7159 [36430]: https://github.com/rust-lang/rust/pull/36430
7160 [36595]: https://github.com/rust-lang/rust/pull/36595
7161 [36692]: https://github.com/rust-lang/rust/pull/36692
7162 [36767]: https://github.com/rust-lang/rust/pull/36767
7163 [36794]: https://github.com/rust-lang/rust/pull/36794
7164 [36798]: https://github.com/rust-lang/rust/pull/36798
7165 [36819]: https://github.com/rust-lang/rust/pull/36819
7166 [36822]: https://github.com/rust-lang/rust/pull/36822
7167 [36825]: https://github.com/rust-lang/rust/pull/36825
7168 [36843]: https://github.com/rust-lang/rust/pull/36843
7169 [36880]: https://github.com/rust-lang/rust/pull/36880
7170 [36886]: https://github.com/rust-lang/rust/issues/36886
7171 [36887]: https://github.com/rust-lang/rust/issues/36887
7172 [36888]: https://github.com/rust-lang/rust/issues/36888
7173 [36889]: https://github.com/rust-lang/rust/issues/36889
7174 [36890]: https://github.com/rust-lang/rust/issues/36890
7175 [36891]: https://github.com/rust-lang/rust/issues/36891
7176 [36892]: https://github.com/rust-lang/rust/issues/36892
7177 [36894]: https://github.com/rust-lang/rust/pull/36894
7178 [36917]: https://github.com/rust-lang/rust/pull/36917
7179 [36993]: https://github.com/rust-lang/rust/pull/36993
7180 [37037]: https://github.com/rust-lang/rust/pull/37037
7181 [37064]: https://github.com/rust-lang/rust/pull/37064
7182 [37094]: https://github.com/rust-lang/rust/pull/37094
7183 [37108]: https://github.com/rust-lang/rust/pull/37108
7184 [37111]: https://github.com/rust-lang/rust/pull/37111
7185 [37161]: https://github.com/rust-lang/rust/pull/37161
7186 [37162]: https://github.com/rust-lang/rust/pull/37162
7187 [37167]: https://github.com/rust-lang/rust/pull/37167
7188 [37178]: https://github.com/rust-lang/rust/pull/37178
7189 [37200]: https://github.com/rust-lang/rust/pull/37200
7190 [37213]: https://github.com/rust-lang/rust/pull/37213
7191 [37221]: https://github.com/rust-lang/rust/pull/37221
7192 [37224]: https://github.com/rust-lang/rust/pull/37224
7193 [37230]: https://github.com/rust-lang/rust/pull/37230
7194 [37231]: https://github.com/rust-lang/rust/pull/37231
7195 [37247]: https://github.com/rust-lang/rust/pull/37247
7196 [37267]: https://github.com/rust-lang/rust/pull/37267
7197 [37270]: https://github.com/rust-lang/rust/pull/37270
7198 [37273]: https://github.com/rust-lang/rust/pull/37273
7199 [37280]: https://github.com/rust-lang/rust/pull/37280
7200 [37298]: https://github.com/rust-lang/rust/pull/37298
7201 [37306]: https://github.com/rust-lang/rust/pull/37306
7202 [37310]: https://github.com/rust-lang/rust/pull/37310
7203 [37312]: https://github.com/rust-lang/rust/pull/37312
7204 [37313]: https://github.com/rust-lang/rust/pull/37313
7205 [37315]: https://github.com/rust-lang/rust/pull/37315
7206 [37318]: https://github.com/rust-lang/rust/pull/37318
7207 [37322]: https://github.com/rust-lang/rust/pull/37322
7208 [37326]: https://github.com/rust-lang/rust/pull/37326
7209 [37351]: https://github.com/rust-lang/rust/pull/37351
7210 [37356]: https://github.com/rust-lang/rust/pull/37356
7211 [37367]: https://github.com/rust-lang/rust/pull/37367
7212 [37373]: https://github.com/rust-lang/rust/pull/37373
7213 [37378]: https://github.com/rust-lang/rust/pull/37378
7214 [37389]: https://github.com/rust-lang/rust/pull/37389
7215 [37392]: https://github.com/rust-lang/rust/pull/37392
7216 [37427]: https://github.com/rust-lang/rust/pull/37427
7217 [37439]: https://github.com/rust-lang/rust/pull/37439
7218 [37445]: https://github.com/rust-lang/rust/pull/37445
7219 [37470]: https://github.com/rust-lang/rust/pull/37470
7220 [37569]: https://github.com/rust-lang/rust/pull/37569
7221 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7222 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7223 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7224 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7225 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7226 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7227 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7230 Version 1.13.0 (2016-11-10)
7231 ===========================
7236 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7237 errors, like the `try!` macro, described in [RFC 0243].
7238 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7239 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7240 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7241 * [Fix lifetime rules for 'if' conditions][36029]
7242 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7247 * [Add the `-C link-arg` argument][36574]
7248 * [Remove the old AST-based backend from rustc_trans][35764]
7249 * [Don't enable NEON by default on armv7 Linux][35814]
7250 * [Fix debug line number info for macro expansions][35238]
7251 * [Do not emit "class method" debuginfo for types that are not
7252 DICompositeType][36008]
7253 * [Warn about multiple conflicting #[repr] hints][34623]
7254 * [When sizing DST, don't double-count nested struct prefixes][36351]
7255 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7256 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7257 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7258 * [Expand macros without recursing to avoid stack overflows][36214]
7263 * [Replace macro backtraces with labeled local uses][35702]
7264 * [Improve error message for misplaced doc comments][33922]
7265 * [Buffer unix and lock windows to prevent message interleaving][35975]
7266 * [Update lifetime errors to specifically note temporaries][36171]
7267 * [Special case a few colors for Windows][36178]
7268 * [Suggest `use self` when such an import resolves][36289]
7269 * [Be more specific when type parameter shadows primitive type][36338]
7270 * Many minor improvements
7272 Compile-time Optimizations
7273 --------------------------
7275 * [Compute and cache HIR hashes at beginning][35854]
7276 * [Don't hash types in loan paths][36004]
7277 * [Cache projections in trans][35761]
7278 * [Optimize the parser's last token handling][36527]
7279 * [Only instantiate #[inline] functions in codegen units referencing
7280 them][36524]. This leads to big improvements in cases where crates export
7281 define many inline functions without using them directly.
7282 * [Lazily allocate TypedArena's first chunk][36592]
7283 * [Don't allocate during default HashSet creation][36734]
7290 * [`overflowing_abs`]
7291 * [`RefCell::try_borrow`]
7292 * [`RefCell::try_borrow_mut`]
7297 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7298 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7300 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7301 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7302 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7303 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7304 * [Use arc4rand on FreeBSD][35884]
7305 * [memrchr: Correct aligned offset computation][35969]
7306 * [Improve Demangling of Rust Symbols][36059]
7307 * [Use monotonic time in condition variables][35048]
7308 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7309 * [Implement conversion traits for `char`][35755]
7310 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7311 * [Zero first byte of CString on drop][36264]
7312 * [Inherit overflow checks for sum and product][36372]
7313 * [Add missing Eq implementations][36423]
7314 * [Implement `Debug` for `DirEntry`][36631]
7315 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7317 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7318 * [Implement more traits for `std::io::ErrorKind`][35911]
7319 * [Optimize BinaryHeap bounds checking][36072]
7320 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7321 `extend_with_element`][36355]
7322 * [Fix overflow checking in unsigned pow()][34942]
7327 * This release includes security fixes to both curl and OpenSSL.
7328 * [Fix transitive doctests when panic=abort][cargo/3021]
7329 * [Add --all-features flag to cargo][cargo/3038]
7330 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7331 * [Don't parse the home directory more than once][cargo/3078]
7332 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7333 * [Update OpenSSL to 1.0.2j][cargo/3121]
7334 * [Add license and license_file to cargo metadata output][cargo/3110]
7335 * [Make crates-io registry URL optional in config; ignore all changes to
7336 source.crates-io][cargo/3089]
7337 * [Don't download dependencies from other platforms][cargo/3123]
7338 * [Build transitive dev-dependencies when needed][cargo/3125]
7339 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7340 * [Avoid updating registry when adding existing deps][cargo/3144]
7341 * [Warn about path overrides that won't work][cargo/3136]
7342 * [Use workspaces during `cargo install`][cargo/3146]
7343 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7344 * [Add --message-format flag][cargo/3000]
7345 * [Pass target environment for rustdoc][cargo/3205]
7346 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7347 * [Update curl and curl-sys][cargo/3241]
7348 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7353 * [rustdoc: Add the `--sysroot` argument][36586]
7354 * [rustdoc: Fix a couple of issues with the search results][35655]
7355 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7356 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7357 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7362 * [Remove unmaintained style guide][35124]
7363 * [Add s390x support][36369]
7364 * [Initial work at Haiku OS support][36727]
7365 * [Add mips-uclibc targets][35734]
7366 * [Crate-ify compiler-rt into compiler-builtins][35021]
7367 * [Add rustc version info (git hash + date) to dist tarball][36213]
7368 * Many documentation improvements
7373 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7374 * [Deny (by default) transmuting from fn item types to pointer-sized
7375 types][34923]. Continuing the long transition to zero-sized fn items,
7377 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7379 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7380 * [Fix lifetime rules for 'if' conditions][36029].
7381 * [Inherit overflow checks for sum and product][36372].
7382 * [Forbid user-defined macros named "macro_rules"][36730].
7384 [33922]: https://github.com/rust-lang/rust/pull/33922
7385 [34623]: https://github.com/rust-lang/rust/pull/34623
7386 [34923]: https://github.com/rust-lang/rust/pull/34923
7387 [34942]: https://github.com/rust-lang/rust/pull/34942
7388 [35021]: https://github.com/rust-lang/rust/pull/35021
7389 [35048]: https://github.com/rust-lang/rust/pull/35048
7390 [35074]: https://github.com/rust-lang/rust/pull/35074
7391 [35124]: https://github.com/rust-lang/rust/pull/35124
7392 [35234]: https://github.com/rust-lang/rust/pull/35234
7393 [35238]: https://github.com/rust-lang/rust/pull/35238
7394 [35354]: https://github.com/rust-lang/rust/pull/35354
7395 [35559]: https://github.com/rust-lang/rust/pull/35559
7396 [35585]: https://github.com/rust-lang/rust/pull/35585
7397 [35627]: https://github.com/rust-lang/rust/pull/35627
7398 [35655]: https://github.com/rust-lang/rust/pull/35655
7399 [35702]: https://github.com/rust-lang/rust/pull/35702
7400 [35707]: https://github.com/rust-lang/rust/pull/35707
7401 [35728]: https://github.com/rust-lang/rust/pull/35728
7402 [35734]: https://github.com/rust-lang/rust/pull/35734
7403 [35755]: https://github.com/rust-lang/rust/pull/35755
7404 [35761]: https://github.com/rust-lang/rust/pull/35761
7405 [35764]: https://github.com/rust-lang/rust/pull/35764
7406 [35814]: https://github.com/rust-lang/rust/pull/35814
7407 [35854]: https://github.com/rust-lang/rust/pull/35854
7408 [35871]: https://github.com/rust-lang/rust/pull/35871
7409 [35884]: https://github.com/rust-lang/rust/pull/35884
7410 [35911]: https://github.com/rust-lang/rust/pull/35911
7411 [35969]: https://github.com/rust-lang/rust/pull/35969
7412 [35975]: https://github.com/rust-lang/rust/pull/35975
7413 [36004]: https://github.com/rust-lang/rust/pull/36004
7414 [36008]: https://github.com/rust-lang/rust/pull/36008
7415 [36014]: https://github.com/rust-lang/rust/pull/36014
7416 [36029]: https://github.com/rust-lang/rust/pull/36029
7417 [36059]: https://github.com/rust-lang/rust/pull/36059
7418 [36072]: https://github.com/rust-lang/rust/pull/36072
7419 [36101]: https://github.com/rust-lang/rust/pull/36101
7420 [36104]: https://github.com/rust-lang/rust/pull/36104
7421 [36171]: https://github.com/rust-lang/rust/pull/36171
7422 [36173]: https://github.com/rust-lang/rust/pull/36173
7423 [36178]: https://github.com/rust-lang/rust/pull/36178
7424 [36213]: https://github.com/rust-lang/rust/pull/36213
7425 [36214]: https://github.com/rust-lang/rust/pull/36214
7426 [36264]: https://github.com/rust-lang/rust/pull/36264
7427 [36266]: https://github.com/rust-lang/rust/pull/36266
7428 [36289]: https://github.com/rust-lang/rust/pull/36289
7429 [36338]: https://github.com/rust-lang/rust/pull/36338
7430 [36351]: https://github.com/rust-lang/rust/pull/36351
7431 [36355]: https://github.com/rust-lang/rust/pull/36355
7432 [36369]: https://github.com/rust-lang/rust/pull/36369
7433 [36372]: https://github.com/rust-lang/rust/pull/36372
7434 [36423]: https://github.com/rust-lang/rust/pull/36423
7435 [36482]: https://github.com/rust-lang/rust/pull/36482
7436 [36505]: https://github.com/rust-lang/rust/pull/36505
7437 [36524]: https://github.com/rust-lang/rust/pull/36524
7438 [36527]: https://github.com/rust-lang/rust/pull/36527
7439 [36551]: https://github.com/rust-lang/rust/pull/36551
7440 [36574]: https://github.com/rust-lang/rust/pull/36574
7441 [36586]: https://github.com/rust-lang/rust/pull/36586
7442 [36592]: https://github.com/rust-lang/rust/pull/36592
7443 [36631]: https://github.com/rust-lang/rust/pull/36631
7444 [36721]: https://github.com/rust-lang/rust/pull/36721
7445 [36727]: https://github.com/rust-lang/rust/pull/36727
7446 [36730]: https://github.com/rust-lang/rust/pull/36730
7447 [36734]: https://github.com/rust-lang/rust/pull/36734
7448 [36754]: https://github.com/rust-lang/rust/pull/36754
7449 [36995]: https://github.com/rust-lang/rust/pull/36995
7450 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7451 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7452 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7453 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7454 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7455 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7456 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7457 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7458 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7459 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7460 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7461 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7462 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7463 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7464 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7465 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7466 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7467 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7468 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7469 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7470 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7471 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7472 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7473 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7474 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7475 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7476 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7477 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7478 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7479 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7480 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7481 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7484 Version 1.12.1 (2016-10-20)
7485 ===========================
7490 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7491 * [Confusion with double negation and booleans][36856]
7492 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7493 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7494 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7495 * [Corrupted memory after updated to 1.12][36936]
7496 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7497 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7498 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7500 [36381]: https://github.com/rust-lang/rust/issues/36381
7501 [36856]: https://github.com/rust-lang/rust/issues/36856
7502 [36875]: https://github.com/rust-lang/rust/issues/36875
7503 [36924]: https://github.com/rust-lang/rust/issues/36924
7504 [36926]: https://github.com/rust-lang/rust/issues/36926
7505 [36936]: https://github.com/rust-lang/rust/issues/36936
7506 [37026]: https://github.com/rust-lang/rust/issues/37026
7507 [37112]: https://github.com/rust-lang/rust/issues/37112
7508 [37153]: https://github.com/rust-lang/rust/issues/37153
7511 Version 1.12.0 (2016-09-29)
7512 ===========================
7517 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7518 This translation pass is far simpler than the previous AST->LLVM pass, and
7519 creates opportunities to perform new optimizations directly on the MIR. It
7520 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7521 * [`rustc` presents a new, more readable error format, along with
7522 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7523 Most common editors supporting Rust have been updated to work with it. It was
7524 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7529 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7530 This translation pass is far simpler than the previous AST->LLVM pass, and
7531 creates opportunities to perform new optimizations directly on the MIR. It
7532 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7533 * [Print the Rust target name, not the LLVM target name, with
7534 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7535 * [The computation of `TypeId` is correct in some cases where it was previously
7536 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7537 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7538 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7539 `--print relocation-models`, and `--print code-models` print the available
7540 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7541 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7542 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7543 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7544 These targets produce statically-linked binaries. There are no binary release
7550 * [`rustc` presents a new, more readable error format, along with
7551 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7552 Most common editors supporting Rust have been updated to work with it. It was
7553 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7554 * [In error descriptions, references are now described in plain English,
7555 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7556 * [In error type descriptions, unknown numeric types are named `{integer}` or
7557 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7558 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7563 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7564 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7565 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7566 useful](https://github.com/rust-lang/rust/pull/34908)
7567 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7568 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7569 * [Semicolons are properly required as statement delimiters inside
7570 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7571 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7576 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7577 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7578 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7579 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7580 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7581 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7582 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7583 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7584 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7585 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7586 Both on Unix and Windows.
7587 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7588 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7589 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7590 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7591 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7592 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7593 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7594 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7599 * [The `format!` macro and friends now allow a single argument to be formatted
7600 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7601 * [The lifetime bounds on `[T]::binary_search_by` and
7602 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7603 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7604 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7605 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7606 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7607 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7608 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7609 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7610 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7611 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7612 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7613 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7614 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7615 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7616 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7617 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7618 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7619 * [`mpsc::sync_channel` `Receiver`s return any available message before
7620 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7621 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7622 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7627 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7628 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7629 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7630 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7631 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7632 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7633 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7634 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7635 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7636 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7637 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7638 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7639 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7640 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7641 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7642 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7647 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7648 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7653 * [Test binaries now support a `--test-threads` argument to specify the number
7654 of threads used to run tests, and which acts the same as the
7655 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7656 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7657 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7658 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7659 * [Rust releases now come with source packages that can be installed by rustup
7660 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7661 The resulting source code can be used by tools and IDES, located in the
7662 sysroot under `lib/rustlib/src`.
7667 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7668 * Many minor improvements to the documentation.
7669 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7674 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7675 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7676 * [When formatting strings, if "precision" is specified, the "fill",
7677 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7678 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7681 Version 1.11.0 (2016-08-18)
7682 ===========================
7687 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7688 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7689 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7690 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7695 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7696 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7697 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7698 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7699 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7700 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7701 (in libcore - previously stabilized in libstd)
7702 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7703 (in libcore - previously stabilized in libstd)
7704 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7705 (in libcore - previously stabilized in libstd)
7706 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7707 (in libcore - previously stabilized in libstd)
7708 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7709 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7710 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7711 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7716 * [The `thread_local!` macro supports multiple definitions in a single
7717 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7718 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7719 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7720 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7721 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7722 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7723 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7724 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7729 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7730 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7731 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7732 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7733 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7734 and `-vv` prints warnings for all crates.
7735 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7736 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7737 This provides room for expansion by arbitrary tools.
7738 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7739 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7740 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7741 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7742 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7743 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7744 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7749 * [Caching projections speeds up type check dramatically for some
7750 workloads](https://github.com/rust-lang/rust/pull/33816)
7751 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7752 This hasher is faster, but is believed to provide sufficient
7753 protection from collision attacks.
7754 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7759 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7760 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7761 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7762 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7763 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7768 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7769 * [When emitting debug info, rustc emits frame pointers for closures,
7770 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7771 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7772 * Many more errors have been given error codes and extended
7774 * API documentation continues to be improved, with many new examples
7779 * [rustc no longer hangs when dependencies recursively re-export
7780 submodules](https://github.com/rust-lang/rust/pull/34542)
7781 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7782 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7783 rewritten](https://github.com/rust-lang/rust/pull/33895)
7784 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7785 No targets use this yet, but it works toward AVR support.
7790 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7791 * [The new follow-set rules that place restrictions on `macro_rules!`
7792 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7793 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7794 and has been a warning since 1.10.
7795 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7796 This causes breakage in some corner cases.
7799 Version 1.10.0 (2016-07-07)
7800 ===========================
7805 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7806 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7807 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7808 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7809 * [`panic!` can be converted to a runtime abort with the
7810 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7811 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7812 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7813 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7814 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7815 Note that Cargo does not yet directly support cdylibs.
7820 * `os::windows::fs::OpenOptionsExt::access_mode`
7821 * `os::windows::fs::OpenOptionsExt::share_mode`
7822 * `os::windows::fs::OpenOptionsExt::custom_flags`
7823 * `os::windows::fs::OpenOptionsExt::attributes`
7824 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7825 * `os::unix::fs::OpenOptionsExt::custom_flags`
7826 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7827 * `Default for sync::Weak`
7828 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7829 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7830 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7831 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7832 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7833 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7834 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7835 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7836 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7837 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7838 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7839 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7840 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7841 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7842 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7843 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7844 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7845 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7846 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7847 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7848 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7849 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7850 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7851 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7852 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7853 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7854 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7855 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7856 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7857 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7858 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7859 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7860 * Read/Write/RawFd impls for `UnixStream`
7861 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7862 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7863 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7864 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7865 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7866 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7867 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7868 * RawFd impls for `UnixListener`
7869 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7870 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7871 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7872 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7873 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7874 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7875 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7876 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7877 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7878 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7879 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7880 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7881 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7882 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7883 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7884 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7885 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7886 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7887 * RawFd impls for `UnixDatagram`
7888 * `{BTree,Hash}Map::values_mut`
7889 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7894 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7895 The semantics of this minor method are subtle and probably not what
7897 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7898 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7899 will fall back to `/dev/urandom` temporarily to avoid blocking
7900 during early boot](https://github.com/rust-lang/rust/pull/33086).
7901 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7902 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7903 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7904 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7905 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7906 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7907 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7911 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7912 This controls the runtime behavior of the `panic!` macro
7913 and can be either "unwind" (the default), or "abort".
7914 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7915 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7916 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7917 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7918 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7919 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7920 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7921 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7922 By default they are retried twice, which can be customized with the
7923 `net.retry` value in `.cargo/config`.
7924 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7925 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7926 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7927 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7928 Makes it possible to install multiple crates in parallel.
7929 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7930 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7931 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7932 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7933 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7934 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7939 * [rustc memory usage was reduced by refactoring the context used for
7940 type checking](https://github.com/rust-lang/rust/pull/33425).
7941 * [Speed up creation of `HashMap`s by caching the random keys used
7942 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7943 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7944 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7945 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7946 10x faster than the previous lookup tables.
7947 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7952 * Many incremental improvements to documentation and rustdoc.
7953 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7954 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7955 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7956 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7957 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7958 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7959 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7964 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7965 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7966 * [`std` no longer prints backtraces on platforms where the running
7967 module must be loaded with `env::current_exe`, which can't be relied
7968 on](https://github.com/rust-lang/rust/pull/33554).
7969 * This release includes std binaries for the i586-unknown-linux-gnu,
7970 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7971 i586 target is for old x86 hardware without SSE2, and the armv7
7972 target is for Android running on modern ARM architectures.
7973 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7974 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7975 * [On Unix the runtime aborts by calling `libc::abort` instead of
7976 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7977 * [Rust is now bootstrapped from the previous release of Rust,
7978 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7983 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7984 * [`target_env` for Linux ARM targets is just `gnu`, not
7985 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7986 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7987 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7988 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7989 Affects how macros are parsed.
7990 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7991 * [Feature-gated attributes on macro-generated macro invocations are
7992 now rejected](https://github.com/rust-lang/rust/pull/32791).
7993 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7994 This caused some minor changes to type inference.
7997 Version 1.9.0 (2016-05-26)
7998 ==========================
8003 * The `#[deprecated]` attribute when applied to an API will generate
8004 warnings when used. The warnings may be suppressed with
8005 `#[allow(deprecated)]`. [RFC 1270].
8006 * [`fn` item types are zero sized, and each `fn` names a unique
8007 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8008 `transmute` on a `fn` type will generate a warning for a few cycles,
8009 then will be converted to an error.
8010 * [Field and method resolution understand visibility, so private
8011 fields and methods cannot prevent the proper use of public fields
8012 and methods][1.9fv].
8013 * [The parser considers unicode codepoints in the
8014 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8020 * [`std::panic::catch_unwind`] (renamed from `recover`)
8021 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8022 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8023 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8024 * [`str::is_char_boundary`]
8025 * [`<*const T>::as_ref`]
8026 * [`<*mut T>::as_ref`]
8027 * [`<*mut T>::as_mut`]
8028 * [`AsciiExt::make_ascii_uppercase`]
8029 * [`AsciiExt::make_ascii_lowercase`]
8030 * [`char::decode_utf16`]
8031 * [`char::DecodeUtf16`]
8032 * [`char::DecodeUtf16Error`]
8033 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8034 * [`BTreeSet::take`]
8035 * [`BTreeSet::replace`]
8038 * [`HashSet::replace`]
8040 * [`OsString::with_capacity`]
8041 * [`OsString::clear`]
8042 * [`OsString::capacity`]
8043 * [`OsString::reserve`]
8044 * [`OsString::reserve_exact`]
8045 * [`OsStr::is_empty`]
8047 * [`std::os::unix::thread`]
8050 * [`JoinHandleExt::as_pthread_t`]
8051 * [`JoinHandleExt::into_pthread_t`]
8052 * [`HashSet::hasher`]
8053 * [`HashMap::hasher`]
8054 * [`CommandExt::exec`]
8055 * [`File::try_clone`]
8056 * [`SocketAddr::set_ip`]
8057 * [`SocketAddr::set_port`]
8058 * [`SocketAddrV4::set_ip`]
8059 * [`SocketAddrV4::set_port`]
8060 * [`SocketAddrV6::set_ip`]
8061 * [`SocketAddrV6::set_port`]
8062 * [`SocketAddrV6::set_flowinfo`]
8063 * [`SocketAddrV6::set_scope_id`]
8064 * [`slice::copy_from_slice`]
8065 * [`ptr::read_volatile`]
8066 * [`ptr::write_volatile`]
8067 * [`OpenOptions::create_new`]
8068 * [`TcpStream::set_nodelay`]
8069 * [`TcpStream::nodelay`]
8070 * [`TcpStream::set_ttl`]
8071 * [`TcpStream::ttl`]
8072 * [`TcpStream::set_only_v6`]
8073 * [`TcpStream::only_v6`]
8074 * [`TcpStream::take_error`]
8075 * [`TcpStream::set_nonblocking`]
8076 * [`TcpListener::set_ttl`]
8077 * [`TcpListener::ttl`]
8078 * [`TcpListener::set_only_v6`]
8079 * [`TcpListener::only_v6`]
8080 * [`TcpListener::take_error`]
8081 * [`TcpListener::set_nonblocking`]
8082 * [`UdpSocket::set_broadcast`]
8083 * [`UdpSocket::broadcast`]
8084 * [`UdpSocket::set_multicast_loop_v4`]
8085 * [`UdpSocket::multicast_loop_v4`]
8086 * [`UdpSocket::set_multicast_ttl_v4`]
8087 * [`UdpSocket::multicast_ttl_v4`]
8088 * [`UdpSocket::set_multicast_loop_v6`]
8089 * [`UdpSocket::multicast_loop_v6`]
8090 * [`UdpSocket::set_multicast_ttl_v6`]
8091 * [`UdpSocket::multicast_ttl_v6`]
8092 * [`UdpSocket::set_ttl`]
8093 * [`UdpSocket::ttl`]
8094 * [`UdpSocket::set_only_v6`]
8095 * [`UdpSocket::only_v6`]
8096 * [`UdpSocket::join_multicast_v4`]
8097 * [`UdpSocket::join_multicast_v6`]
8098 * [`UdpSocket::leave_multicast_v4`]
8099 * [`UdpSocket::leave_multicast_v6`]
8100 * [`UdpSocket::take_error`]
8101 * [`UdpSocket::connect`]
8102 * [`UdpSocket::send`]
8103 * [`UdpSocket::recv`]
8104 * [`UdpSocket::set_nonblocking`]
8109 * [`std::sync::Once` is poisoned if its initialization function
8111 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8112 * [Most types implement `fmt::Debug`][1.9db].
8113 * [The default buffer size used by `BufReader` and `BufWriter` was
8114 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8115 used by other languages.
8116 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8117 `Duration` additionally implements `*=` and `/=`][1.9ta].
8118 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8119 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8120 * [`Chain` implements `BufRead`][1.9ch].
8121 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8126 * [Cargo can now run concurrently][1.9cc].
8127 * [Top-level overrides allow specific revisions of crates to be
8128 overridden through the entire crate graph][1.9ct]. This is intended
8129 to make upgrades easier for large projects, by allowing crates to be
8130 forked temporarily until they've been upgraded and republished.
8131 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8132 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8133 on the commandline][1.9cf]. `rustc` arguments can also be specified
8134 in the `build.rustflags` configuration key.
8139 * [The time complexity of comparing variables for equivalence during type
8140 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8141 to major compilation time improvement in some scenarios.
8142 * [`ToString` is specialized for `str`, giving it the same performance
8143 as `to_owned`][1.9ts].
8144 * [Spawning processes with `Command::output` no longer creates extra
8146 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8147 for C-like enums][1.9cl].
8152 * [Passing the `--quiet` flag to a test runner will produce
8153 much-abbreviated output][1.9q].
8154 * The Rust Project now publishes std binaries for the
8155 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8156 `i586-pc-windows-msvc` targets.
8161 * [`std::sync::Once` is poisoned if its initialization function
8163 * [It is illegal to define methods with the same name in overlapping
8164 inherent `impl` blocks][1.9sn].
8165 * [`fn` item types are zero sized, and each `fn` names a unique
8166 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8167 `transmute` on a `fn` type will generate a warning for a few cycles,
8168 then will be converted to an error.
8169 * [Improvements to const evaluation may trigger new errors when integer
8170 literals are out of range][1.9ce].
8173 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8174 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8175 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8176 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8177 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8178 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8179 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8180 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8181 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8182 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8183 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8184 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8185 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8186 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8187 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8188 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8189 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8190 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8191 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8192 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8193 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8194 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8195 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8196 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8197 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8198 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8199 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8200 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8201 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8202 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8203 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8204 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8205 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8206 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8207 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8208 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8209 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8210 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8211 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8212 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8213 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8214 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8215 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8216 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8217 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8218 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8219 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8220 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8221 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8222 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8223 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8224 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8225 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8226 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8227 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8228 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8229 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8230 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8231 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8232 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8233 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8234 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8235 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8236 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8237 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8238 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8239 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8240 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8241 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8242 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8243 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8244 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8245 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8246 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8247 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8248 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8249 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8250 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8251 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8252 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8253 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8254 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8255 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8256 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8257 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8258 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8259 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8260 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8261 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8262 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8263 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8264 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8265 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8266 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8267 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8268 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8269 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8270 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8271 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8272 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8273 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8274 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8275 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8276 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8277 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8278 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8279 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8280 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8281 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8282 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8285 Version 1.8.0 (2016-04-14)
8286 ==========================
8291 * Rust supports overloading of compound assignment statements like
8292 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8293 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8294 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8296 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8297 addition to the non-braced form, `struct Foo;`. [RFC 218].
8303 * [`str::encode_utf16`] (renamed from `utf16_units`)
8304 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8307 * [`ptr::drop_in_place`]
8309 * [`time::SystemTime`]
8311 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8312 * [`Instant::elapsed`]
8313 * [`SystemTime::now`]
8314 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8315 * [`SystemTime::elapsed`]
8316 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8317 * [`SystemTimeError`]
8318 * [`SystemTimeError::duration`]
8319 * Various impls for `SystemTimeError`
8321 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8322 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8323 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8324 * [The `write!` and `writeln!` macros correctly emit errors if any of
8325 their arguments can't be formatted][1.8w].
8326 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8327 * [The Unix-specific `raw` modules, which contain a number of
8328 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8329 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8330 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8331 across platforms was making it difficult to implement `std`
8332 correctly. Those that need these definitions should use the `libc`
8334 * The Unix-specific `MetadataExt` traits, including
8335 `os::unix::fs::MetadataExt`, which expose values such as inode
8336 numbers [no longer return platform-specific types][1.8r], but
8337 instead return widened integers. [RFC 1415].
8338 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8339 * [Atomic loads and stores are not volatile][1.8a].
8340 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8345 * [Inlining hash functions lead to a 3% compile-time improvement in
8346 some workloads][1.8h].
8347 * When using jemalloc, its symbols are [unprefixed so that it
8348 overrides the libc malloc implementation][1.8h]. This means that for
8349 rustc, LLVM is now using jemalloc, which results in a 6%
8350 compile-time improvement on a specific workload.
8351 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8356 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8357 i686-pc-windows-msvc is now considered a tier-1 platform.
8358 * [The `--print targets` flag prints a list of supported targets][1.8t].
8359 * [The `--print cfg` flag prints the `cfg`s defined for the current
8361 * [`rustc` can be built with an new Cargo-based build system, written
8362 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8363 build system. To enable it configure with `configure --rustbuild`.
8364 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8365 variants while also indicating the total number of missing variants
8366 if more than 3][1.8m].
8367 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8368 * The Rust Project now publishes binary releases of the standard
8369 library for a number of tier-2 targets:
8370 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8371 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8372 `x86_64-rumprun-netbsd`. These can be installed with
8373 tools such as [multirust][1.8mr].
8378 * [`cargo init` creates a new Cargo project in the current
8379 directory][1.8ci]. It is otherwise like `cargo new`.
8380 * [Cargo has configuration keys for `-v` and
8381 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8382 `[term]` section of `.cargo/config`.
8383 * [Configuration keys that evaluate to strings or integers can be set
8384 via environment variables][1.8ce]. For example the `build.jobs` key
8385 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8386 precedence over config files.
8387 * [Target-specific dependencies support Rust `cfg` syntax for
8388 describing targets][1.8cfg] so that dependencies for multiple
8389 targets can be specified together. [RFC 1361].
8390 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8391 `RUSTDOC` take precedence over the `build.target-dir`,
8392 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8393 * [The child process tree is killed on Windows when Cargo is
8395 * [The `build.target` configuration value sets the target platform,
8396 like `--target`][1.8ct].
8401 * [Unstable compiler flags have been further restricted][1.8u]. Since
8402 1.0 `-Z` flags have been considered unstable, and other flags that
8403 were considered unstable additionally required passing `-Z
8404 unstable-options` to access. Unlike unstable language and library
8405 features though, these options have been accessible on the stable
8406 release channel. Going forward, *new unstable flags will not be
8407 available on the stable release channel*, and old unstable flags
8408 will warn about their usage. In the future, all unstable flags will
8409 be unavailable on the stable release channel.
8410 * [It is no longer possible to `match` on empty enum variants using
8411 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8412 * The Unix-specific `MetadataExt` traits, including
8413 `os::unix::fs::MetadataExt`, which expose values such as inode
8414 numbers [no longer return platform-specific types][1.8r], but
8415 instead return widened integers. [RFC 1415].
8416 * [Modules sourced from the filesystem cannot appear within arbitrary
8417 blocks, but only within other modules][1.8mf].
8418 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8419 * On Unix, [stack overflow triggers a runtime abort instead of a
8421 * [`Command::spawn` and its equivalents return an error if any of
8422 its command-line arguments contain interior `NUL`s][1.8n].
8423 * [Tuple and unit enum variants from other crates are in the type
8425 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8426 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8427 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8428 instead of `foo.lib`.
8431 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8432 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8433 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8434 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8435 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8436 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8437 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8438 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8439 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8440 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8441 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8442 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8443 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8444 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8445 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8446 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8447 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8448 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8449 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8450 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8451 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8452 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8453 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8454 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8455 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8456 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8457 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8458 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8459 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8460 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8461 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8462 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8463 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8464 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8465 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8466 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8467 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8468 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8469 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8470 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8471 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8472 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8473 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8474 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8475 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8476 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8477 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8478 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8479 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8480 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8481 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8482 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8483 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8484 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8485 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8486 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8487 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8488 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8489 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8490 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8493 Version 1.7.0 (2016-03-03)
8494 ==========================
8501 * [`Path::strip_prefix`] (renamed from relative_from)
8502 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8504 * [`Ipv4Addr::is_loopback`]
8505 * [`Ipv4Addr::is_private`]
8506 * [`Ipv4Addr::is_link_local`]
8507 * [`Ipv4Addr::is_multicast`]
8508 * [`Ipv4Addr::is_broadcast`]
8509 * [`Ipv4Addr::is_documentation`]
8511 * [`Ipv6Addr::is_unspecified`]
8512 * [`Ipv6Addr::is_loopback`]
8513 * [`Ipv6Addr::is_multicast`]
8516 * [`Vec::as_mut_slice`]
8518 * [`String::as_str`]
8519 * [`String::as_mut_str`]
8521 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8523 * `<[T]>::`[`sort_by_key`]
8524 * checked, saturated, and overflowing operations
8525 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8526 * [`i32::saturating_mul`]
8527 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8528 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8529 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8530 * [`u32::saturating_mul`]
8531 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8532 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8533 * and checked, saturated, and overflowing operations for other primitive types
8535 * [`ffi::IntoStringError`]
8536 * [`CString::into_string`]
8537 * [`CString::into_bytes`]
8538 * [`CString::into_bytes_with_nul`]
8539 * `From<CString> for Vec<u8>`
8541 * [`IntoStringError::into_cstring`]
8542 * [`IntoStringError::utf8_error`]
8543 * `Error for IntoStringError`
8545 * [`std::hash::BuildHasher`]
8546 * [`BuildHasher::Hasher`]
8547 * [`BuildHasher::build_hasher`]
8548 * [`std::hash::BuildHasherDefault`]
8549 * [`HashMap::with_hasher`]
8550 * [`HashMap::with_capacity_and_hasher`]
8551 * [`HashSet::with_hasher`]
8552 * [`HashSet::with_capacity_and_hasher`]
8553 * [`std::collections::hash_map::RandomState`]
8554 * [`RandomState::new`]
8555 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8556 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8557 from bytes is faster.
8558 * [The performance of `LineWriter` (and thus `io::stdout`) was
8559 improved by using `memchr` to search for newlines][1.7m].
8560 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8561 `f64` variants were stabilized previously.
8562 * [`BTreeMap` was rewritten to use less memory and improve the performance
8563 of insertion and iteration, the latter by as much as 5x][1.7bm].
8564 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8565 covariant over their contained type][1.7bt].
8566 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8567 over their contained type][1.7ll].
8568 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8570 * [`Any` is implemented for unsized types][1.7a].
8571 * [`Hash` is implemented for `Duration`][1.7h].
8576 * [When running tests with `--test`, rustdoc will pass `--cfg`
8577 arguments to the compiler][1.7dt].
8578 * [The compiler is built with RPATH information by default][1.7rpa].
8579 This means that it will be possible to run `rustc` when installed in
8580 unusual configurations without configuring the dynamic linker search
8582 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8583 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8584 over `LD_LIBRARY_PATH`.
8589 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8590 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8591 * [The `rerun-if-changed` build script directive no longer causes the
8592 build script to incorrectly run twice in certain scenarios][1.7rr].
8597 * Soundness fixes to the interactions between associated types and
8598 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8599 code that violates the new rules. This is a significant change that
8600 is known to break existing code, so it has emitted warnings for the
8601 new error cases since 1.4 to give crate authors time to adapt. The
8602 details of what is changing are subtle; read the RFC for more.
8603 * [Several bugs in the compiler's visibility calculations were
8604 fixed][1.7v]. Since this was found to break significant amounts of
8605 code, the new errors will be emitted as warnings for several release
8606 cycles, under the `private_in_public` lint.
8607 * Defaulted type parameters were accidentally accepted in positions
8608 that were not intended. In this release, [defaulted type parameters
8609 appearing outside of type definitions will generate a
8610 warning][1.7d], which will become an error in future releases.
8611 * [Parsing "." as a float results in an error instead of 0][1.7p].
8612 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8613 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8615 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8616 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8617 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8618 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8619 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8620 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8621 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8622 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8623 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8624 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8625 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8626 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8627 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8628 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8629 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8630 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8631 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8632 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8633 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8634 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8635 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8636 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8637 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8638 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8639 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8640 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8641 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8642 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8643 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8644 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8645 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8646 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8647 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8648 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8649 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8650 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8651 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8652 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8653 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8654 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8655 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8656 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8657 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8658 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8659 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8660 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8661 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8662 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8663 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8664 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8665 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8666 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8667 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8668 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8669 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8670 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8671 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8672 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8673 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8674 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8675 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8676 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8677 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8678 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8679 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8680 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8681 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8682 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8683 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8684 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8685 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8686 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8687 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8688 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8689 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8690 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8691 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8692 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8693 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8696 Version 1.6.0 (2016-01-21)
8697 ==========================
8702 * The `#![no_std]` attribute causes a crate to not be linked to the
8703 standard library, but only the [core library][1.6co], as described
8704 in [RFC 1184]. The core library defines common types and traits but
8705 has no platform dependencies whatsoever, and is the basis for Rust
8706 software in environments that cannot support a full port of the
8707 standard library, such as operating systems. Most of the core
8708 library is now stable.
8714 [`Read::read_exact`],
8715 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8716 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8717 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8718 [`os::unix::fs::DirBuilderExt`],
8719 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8720 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8721 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8722 [`collections::hash_map::Drain`],
8723 [`collections::hash_map::HashMap::drain`],
8724 [`collections::hash_set::Drain`],
8725 [`collections::hash_set::HashSet::drain`],
8726 [`collections::binary_heap::Drain`],
8727 [`collections::binary_heap::BinaryHeap::drain`],
8728 [`Vec::extend_from_slice`] (renamed from `push_all`),
8729 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8730 [`RwLock::into_inner`],
8731 [`Iterator::min_by_key`] (renamed from `min_by`),
8732 [`Iterator::max_by_key`] (renamed from `max_by`).
8733 * The [core library][1.6co] is stable, as are most of its APIs.
8734 * [The `assert_eq!` macro supports arguments that don't implement
8735 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8737 * Several timer functions that take duration in milliseconds [are
8738 deprecated in favor of those that take `Duration`][1.6ms]. These
8739 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8740 `thread::park_timeout_ms`.
8741 * The algorithm by which `Vec` reserves additional elements was
8742 [tweaked to not allocate excessive space][1.6a] while still growing
8744 * `From` conversions are [implemented from integers to floats][1.6f]
8745 in cases where the conversion is lossless. Thus they are not
8746 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8747 or `f64`. They are also not implemented for `isize` and `usize`
8748 because the implementations would be platform-specific. `From` is
8749 also implemented from `f32` to `f64`.
8750 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8751 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8752 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8753 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8755 * Sorting slices that are already sorted [is 50% faster in some
8761 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8762 * Cargo build scripts can specify their dependencies by emitting the
8763 [`rerun-if-changed`][1.6rr] key.
8764 * crates.io will reject publication of crates with dependencies that
8765 have a wildcard version constraint. Crates with wildcard
8766 dependencies were seen to cause a variety of problems, as described
8767 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8769 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8770 release folder. A variety of artifacts that Cargo failed to clean
8771 are now correctly deleted.
8776 * The `unreachable_code` lint [warns when a function call's argument
8778 * The parser indicates [failures that may be caused by
8779 confusingly-similar Unicode characters][1.6uc]
8780 * Certain macro errors [are reported at definition time][1.6m], not
8786 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8787 environment variable when locating crates. This was a pre-cargo
8788 feature for integrating with the package manager that was
8789 accidentally never removed.
8790 * [A number of bugs were fixed in the privacy checker][1.6p] that
8791 could cause previously-accepted code to break.
8792 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8793 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8794 struct pattern syntax (`Foo(..)`) can no longer be used to match
8795 unit structs. This is a warning now, but will become an error in
8796 future releases. Patterns that share the same name as a const are
8798 * A bug was fixed that causes [rustc not to apply default type
8799 parameters][1.6xc] when resolving certain method implementations of
8800 traits defined in other crates.
8802 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8803 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8804 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8805 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8806 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8807 [1.6co]: http://doc.rust-lang.org/core/index.html
8808 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8809 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8810 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8811 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8812 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8813 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8814 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8815 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8816 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8817 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8818 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8819 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8820 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8821 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8822 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8823 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8824 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8825 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8826 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8827 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8828 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8829 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8830 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8831 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8832 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8833 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8834 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8835 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8836 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8837 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8838 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8839 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8840 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8841 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8842 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8843 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8844 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8845 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8846 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8847 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8848 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8851 Version 1.5.0 (2015-12-10)
8852 ==========================
8854 * ~700 changes, numerous bugfixes
8860 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8861 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8862 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8863 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8864 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8865 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8866 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8867 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8868 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8869 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8870 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8871 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8872 [`Path::read_link`], [`Path::symlink_metadata`],
8873 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8874 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8875 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8876 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8877 [`slice::split_first_mut`], [`slice::split_first`],
8878 [`slice::split_last_mut`], [`slice::split_last`],
8879 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8880 [`str::MatchIndices`], [`str::RMatchIndices`],
8881 [`str::match_indices`], [`str::rmatch_indices`],
8882 [`str::slice_mut_unchecked`], [`string::ParseError`].
8883 * Rust applications hosted on crates.io can be installed locally to
8884 `~/.cargo/bin` with the [`cargo install`] command. Among other
8885 things this makes it easier to augment Cargo with new subcommands:
8886 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8887 invoked as `cargo foo`.
8888 * Crates with wildcard (`*`) dependencies will [emit warnings when
8889 published][1.5w]. In 1.6 it will no longer be possible to publish
8890 crates with wildcard dependencies.
8895 * The rules determining when a particular lifetime must outlive
8896 a particular value (known as '[dropck]') have been [modified
8897 to not rely on parametricity][1.5p].
8898 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8899 and `Arc`][1.5a]. Because these smart pointer types implement
8900 `Deref`, this causes breakage in cases where the interior type
8901 contains methods of the same name.
8902 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8903 that they could drop their content. Soundness fix.
8904 * All method invocations are [properly checked][1.5wf1] for
8905 [well-formedness][1.5wf2]. Soundness fix.
8906 * Traits whose supertraits contain `Self` are [not object
8907 safe][1.5o]. Soundness fix.
8908 * Target specifications support a [`no_default_libraries`][1.5nd]
8909 setting that controls whether `-nodefaultlibs` is passed to the
8910 linker, and in turn the `is_like_windows` setting no longer affects
8911 the `-nodefaultlibs` flag.
8912 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8913 * The `#[inline]` and `#[repr]` attributes [can only appear
8914 in valid locations][1.5at].
8915 * Native libraries linked from the local crate are [passed to
8916 the linker before native libraries from upstream crates][1.5nl].
8917 * Two rarely-used attributes, `#[no_debug]` and
8918 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8919 * Negation of unsigned integers, which has been a warning for
8920 several releases, [is now behind a feature gate and will
8921 generate errors][1.5nu].
8922 * The parser accidentally accepted visibility modifiers on
8923 enum variants, a bug [which has been fixed][1.5ev].
8924 * [A bug was fixed that allowed `use` statements to import unstable
8930 * When evaluating expressions at compile-time that are not
8931 compile-time constants (const-evaluating expressions in non-const
8932 contexts), incorrect code such as overlong bitshifts and arithmetic
8933 overflow will [generate a warning instead of an error][1.5ce],
8934 delaying the error until runtime. This will allow the
8935 const-evaluator to be expanded in the future backwards-compatibly.
8936 * The `improper_ctypes` lint [no longer warns about using `isize` and
8937 `usize` in FFI][1.5ict].
8942 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8944 * `Default` is [implemented for mutable slices][1.5d].
8945 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8946 * There are now `From` conversions [between floating point
8947 types][1.5f] where the conversions are lossless.
8948 * There are now `From` conversions [between integer types][1.5i] where
8949 the conversions are lossless.
8950 * [`fs::Metadata` implements `Clone`][1.5fs].
8951 * The `parse` method [accepts a leading "+" when parsing
8953 * [`AsMut` is implemented for `Vec`][1.5am].
8954 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8955 been optimized][1.5cf] and no longer rely on the default impl.
8956 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8957 `unsafe extern "C"` function types now [implement `Clone`,
8958 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8959 `fmt::Debug` for up to 12 arguments][1.5fp].
8960 * [Dropping `Vec`s is much faster in unoptimized builds when the
8961 element types don't implement `Drop`][1.5dv].
8962 * A bug that caused in incorrect behavior when [combining `VecDeque`
8963 with zero-sized types][1.5vdz] was resolved.
8964 * [`PartialOrd` for slices is faster][1.5po].
8969 * [Crate metadata size was reduced by 20%][1.5md].
8970 * [Improvements to code generation reduced the size of libcore by 3.3
8971 MB and rustc's memory usage by 18MB][1.5m].
8972 * [Improvements to deref translation increased performance in
8973 unoptimized builds][1.5dr].
8974 * Various errors in trait resolution [are deduplicated to only be
8975 reported once][1.5te].
8976 * Rust has preliminary [support for rumprun kernels][1.5rr].
8977 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8979 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8980 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8981 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8982 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8983 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8984 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8985 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8986 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8987 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8988 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8989 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8990 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8991 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8992 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8993 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8994 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8995 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8996 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8997 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8998 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8999 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9000 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9001 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9002 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9003 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9004 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9005 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9006 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9007 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9008 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9009 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9010 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9011 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9012 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9013 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9014 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9015 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9016 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9017 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9018 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9019 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9020 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9021 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9022 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9023 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9024 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9025 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9026 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9027 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9028 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9029 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9030 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9031 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9032 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9033 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9034 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9035 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9036 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9037 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9038 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9039 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9040 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9041 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9042 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9043 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9044 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9045 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9046 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9047 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9048 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9049 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9050 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9051 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9052 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9053 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9054 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9055 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9056 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9057 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9058 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9059 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9060 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9061 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9062 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9063 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9064 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9065 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9066 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9067 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9069 Version 1.4.0 (2015-10-29)
9070 ==========================
9072 * ~1200 changes, numerous bugfixes
9077 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9078 GNU) are now supported and recommended for use.
9083 * [Several changes have been made to fix type soundness and improve
9084 the behavior of associated types][sound]. See [RFC 1214]. Although
9085 we have mostly introduced these changes as warnings this release, to
9086 become errors next release, there are still some scenarios that will
9087 see immediate breakage.
9088 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9089 line breaks in addition to `\n`][crlf].
9090 * [Loans of `'static` lifetime extend to the end of a function][stat].
9091 * [`str::parse` no longer introduces avoidable rounding error when
9092 parsing floating point numbers. Together with earlier changes to
9093 float formatting/output, "round trips" like f.to_string().parse()
9094 now preserve the value of f exactly. Additionally, leading plus
9095 signs are now accepted][fp3].
9101 * `use` statements that import multiple items [can now rename
9102 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9103 * [Binops work correctly on fat pointers][binfat].
9104 * `pub extern crate`, which does not behave as expected, [issues a
9105 warning][pec] until a better solution is found.
9110 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9111 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9112 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9113 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9114 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9115 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9116 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9117 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9118 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9119 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9120 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9121 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9122 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9123 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9124 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9125 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9126 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9127 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9129 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9130 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9131 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9132 `f64::from_str_radix`.
9133 * [Reverse-searching strings is faster with the 'two-way'
9135 * [`std::io::copy` allows `?Sized` arguments][cc].
9136 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9137 [override `count`, `nth` and `last` with an *O*(1)
9138 implementation][it].
9139 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9140 * [`IntoRawFd` has been added to the Unix-specific prelude,
9141 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9143 * [`Extend<String>` and `FromIterator<String` are both implemented for
9145 * [`IntoIterator` is implemented for references to `Option` and
9147 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9148 Copy`][ext] as part of [RFC 839]. This will cause type inference
9149 breakage in rare situations.
9150 * [`BinaryHeap` implements `Debug`][bh2].
9151 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9153 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9154 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9155 * [String comparison is faster][faststr].
9156 * `&mut T` where `T: std::fmt::Write` [also implements
9157 `std::fmt::Write`][mutw].
9158 * [A stable regression in `VecDeque::push_back` and other
9159 capacity-altering methods that caused panics for zero-sized types
9161 * [Function pointers implement traits for up to 12 parameters][fp2].
9166 * The compiler [no longer uses the 'morestack' feature to prevent
9167 stack overflow][mm]. Instead it uses guard pages and stack
9168 probes (though stack probes are not yet implemented on any platform
9170 * [The compiler matches traits faster when projections are involved][p].
9171 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9173 * [Cargo now displays useful information about what its doing during
9174 `cargo update`][cu].
9176 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9177 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9178 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9179 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9180 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9181 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9182 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9183 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9184 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9185 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9186 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9187 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9188 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9189 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9190 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9191 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9192 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9193 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9194 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9195 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9196 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9197 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9198 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9199 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9200 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9201 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9202 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9203 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9204 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9205 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9206 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9207 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9208 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9209 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9210 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9211 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9212 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9213 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9214 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9215 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9216 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9217 [bh2]: https://github.com/rust-lang/rust/pull/28156
9218 [binfat]: https://github.com/rust-lang/rust/pull/28270
9219 [bm]: https://github.com/rust-lang/rust/pull/28197
9220 [cc]: https://github.com/rust-lang/rust/pull/27531
9221 [crlf]: https://github.com/rust-lang/rust/pull/28034
9222 [cu]: https://github.com/rust-lang/cargo/pull/1931
9223 [d]: https://github.com/rust-lang/rust/pull/27825
9224 [dep]: https://github.com/rust-lang/rust/pull/28339
9225 [es]: https://github.com/rust-lang/rust/pull/27956
9226 [ext]: https://github.com/rust-lang/rust/pull/28094
9227 [faststr]: https://github.com/rust-lang/rust/pull/28338
9228 [ffi]: https://github.com/rust-lang/rust/pull/28779
9229 [fp]: https://github.com/rust-lang/rust/pull/28268
9230 [fp2]: https://github.com/rust-lang/rust/pull/28560
9231 [fp3]: https://github.com/rust-lang/rust/pull/27307
9232 [i]: https://github.com/rust-lang/rust/pull/27451
9233 [into2]: https://github.com/rust-lang/rust/pull/28039
9234 [it]: https://github.com/rust-lang/rust/pull/27652
9235 [mm]: https://github.com/rust-lang/rust/pull/27338
9236 [mutw]: https://github.com/rust-lang/rust/pull/28368
9237 [sound]: https://github.com/rust-lang/rust/pull/27641
9238 [p]: https://github.com/rust-lang/rust/pull/27866
9239 [pec]: https://github.com/rust-lang/rust/pull/28486
9240 [pr]: https://github.com/rust-lang/rust/pull/27896
9241 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9242 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9243 [s]: https://github.com/rust-lang/rust/pull/27474
9244 [stab]: https://github.com/rust-lang/rust/pull/28339
9245 [stat]: https://github.com/rust-lang/rust/pull/28321
9246 [vd]: https://github.com/rust-lang/rust/pull/28494
9248 Version 1.3.0 (2015-09-17)
9249 ==============================
9251 * ~900 changes, numerous bugfixes
9256 * The [new object lifetime defaults][nold] have been [turned
9257 on][nold2] after a cycle of warnings about the change. Now types
9258 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9259 being interpreted as `&'a Box<Trait+'a>` to `&'a
9260 Box<Trait+'static>`.
9261 * [The Rustonomicon][nom] is a new book in the official documentation
9262 that dives into writing unsafe Rust.
9263 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9264 timekeeping is employed by other std APIs, as well as out-of-tree
9270 * The [new object lifetime defaults][nold] have been [turned
9271 on][nold2] after a cycle of warnings about the change.
9272 * There is a known [regression][lr] in how object lifetime elision is
9273 interpreted, the proper solution for which is undetermined.
9274 * The `#[prelude_import]` attribute, an internal implementation
9275 detail, was accidentally stabilized previously. [It has been put
9276 behind the `prelude_import` feature gate][pi]. This change is
9277 believed to break no existing code.
9278 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9279 [more sane for dynamically sized types][dst3]. Code that relied on
9280 the previous behavior is thought to be broken.
9281 * The `dropck` rules, which checks that destructors can't access
9282 destroyed values, [have been updated][dropck] to match the
9283 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9284 cause some previously-compiling code to no longer build.
9289 * The [new object lifetime defaults][nold] have been [turned
9290 on][nold2] after a cycle of warnings about the change.
9291 * Semicolons may [now follow types and paths in
9292 macros](https://github.com/rust-lang/rust/pull/27000).
9293 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9294 [more sane for dynamically sized types][dst3]. Code that relied on
9295 the previous behavior is not known to exist, and suspected to be
9297 * `'static` variables [may now be recursive][st].
9298 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9299 implementations correctly.
9300 * The `dropck` rules, which checks that destructors can't access
9301 destroyed values, [have been updated][dropck] to match the
9307 * The [`Duration`] API, [has been stabilized][ds], as well as the
9308 `std::time` module, which presently contains only `Duration`.
9309 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9310 * The owned C string, [`CString`], implements [`Borrow`] and the
9311 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9312 these allow C strings to be borrowed and cloned in generic code.
9313 * [`CStr`] implements [`Debug`].
9314 * [`AtomicPtr`] implements [`Debug`].
9315 * [`Error`] trait objects [can be downcast to their concrete types][e]
9316 in many common configurations, using the [`is`], [`downcast`],
9317 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9319 * Searching for substrings now [employs the two-way algorithm][search]
9320 instead of doing a naive search. This gives major speedups to a
9321 number of methods, including [`contains`][sc], [`find`][sf],
9322 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9323 [`ends_with`][sew] are also faster.
9324 * The performance of `PartialEq` for slices is [much faster][ps].
9325 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9326 is overridden and optimized by the implementations for scalars.
9327 * The [`Hasher`] trait now has a number of specialized `write_*`
9328 methods for primitive types, for efficiency.
9329 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9330 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9331 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9332 of [`std::error::Error::cause`][iec] also delegates to the inner
9334 * [`process::Child`][pc] gained the [`id`] method, which returns a
9335 `u32` representing the platform-specific process identifier.
9336 * The [`connect`] method on slices is deprecated, replaced by the new
9337 [`join`] method (note that both of these are on the *unstable*
9338 [`SliceConcatExt`] trait, but through the magic of the prelude are
9339 available to stable code anyway).
9340 * The [`Div`] operator is implemented for [`Wrapping`] types.
9341 * [`DerefMut` is implemented for `String`][dms].
9342 * Performance of SipHash (the default hasher for `HashMap`) is
9343 [better for long data][sh].
9344 * [`AtomicPtr`] implements [`Send`].
9345 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9346 are now [specialized to use uninitialized buffers for increased
9348 * Lifetime parameters of foreign functions [are now resolved
9354 * Rust can now, with some coercion, [produce programs that run on
9355 Windows XP][xp], though XP is not considered a supported platform.
9356 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9357 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9358 recommended for use in 1.3, though should be fully-functional
9359 in the [64-bit 1.4 beta][b14].
9360 * On Fedora-based systems installation will [properly configure the
9361 dynamic linker][fl].
9362 * The compiler gained many new extended error descriptions, which can
9363 be accessed with the `--explain` flag.
9364 * The `dropck` pass, which checks that destructors can't access
9365 destroyed values, [has been rewritten][27261]. This fixes some
9366 soundness holes, and as such will cause some previously-compiling
9367 code to no longer build.
9368 * `rustc` now uses [LLVM to write archive files where possible][ar].
9369 Eventually this will eliminate the compiler's dependency on the ar
9371 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9372 supported FreeBSD on x86_64).
9373 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9374 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9376 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9377 will kill the process instead of leaking][nlp].
9379 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9380 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9381 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9382 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9383 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9384 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9385 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9386 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9387 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9388 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9389 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9390 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9391 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9392 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9393 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9394 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9395 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9396 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9397 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9398 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9399 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9400 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9401 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9402 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9403 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9404 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9405 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9406 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9407 [ar]: https://github.com/rust-lang/rust/pull/26926
9408 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9409 [dms]: https://github.com/rust-lang/rust/pull/26241
9410 [27261]: https://github.com/rust-lang/rust/pull/27261
9411 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9412 [ds]: https://github.com/rust-lang/rust/pull/26818
9413 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9414 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9415 [dst3]: https://github.com/rust-lang/rust/pull/27351
9416 [e]: https://github.com/rust-lang/rust/pull/24793
9417 [f]: https://github.com/rust-lang/rust/pull/26588
9418 [26959]: https://github.com/rust-lang/rust/pull/26959
9419 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9420 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9421 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9422 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9423 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9424 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9425 [lic]: https://github.com/rust-lang/rust/pull/26583
9426 [lnu]: https://github.com/rust-lang/rust/pull/27026
9427 [lr]: https://github.com/rust-lang/rust/issues/27248
9428 [lum]: https://github.com/rust-lang/rust/pull/26378
9429 [lur]: https://github.com/rust-lang/rust/pull/26783
9430 [nlp]: https://github.com/rust-lang/rust/pull/27176
9431 [nold2]: https://github.com/rust-lang/rust/pull/27045
9432 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9433 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9434 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9435 [pi]: https://github.com/rust-lang/rust/pull/26699
9436 [ps]: https://github.com/rust-lang/rust/pull/26884
9437 [rte]: https://github.com/rust-lang/rust/pull/26950
9438 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9439 [search]: https://github.com/rust-lang/rust/pull/26327
9440 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9441 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9442 [sh]: https://github.com/rust-lang/rust/pull/27280
9443 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9444 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9445 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9446 [st]: https://github.com/rust-lang/rust/pull/26630
9447 [win1]: https://github.com/rust-lang/rust/pull/26569
9448 [win2]: https://github.com/rust-lang/rust/pull/26741
9449 [win3]: https://github.com/rust-lang/rust/pull/26741
9450 [win4]: https://github.com/rust-lang/rust/pull/27210
9451 [xp]: https://github.com/rust-lang/rust/pull/26569
9453 Version 1.2.0 (2015-08-07)
9454 ==========================
9456 * ~1200 changes, numerous bugfixes
9461 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9462 like `Rc` to contain types without a fixed size, arrays and trait
9463 objects, finally enabling use of `Rc<[T]>` and completing the
9464 implementation of DST.
9465 * [Parallel codegen][parcodegen] is now working again, which can
9466 substantially speed up large builds in debug mode; It also gets
9467 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9468 jobs). It's not enabled by default, but will be "in the near
9469 future". It can be activated with the `-C codegen-units=N` flag to
9471 * This is the first release with [experimental support for linking
9472 with the MSVC linker and lib C on Windows (instead of using the GNU
9473 variants via MinGW)][win]. It is yet recommended only for the most
9474 intrepid Rustaceans.
9475 * Benchmark compilations are showing a 30% improvement in
9476 bootstrapping over 1.1.
9481 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9482 unicode case mapping, which is a previously-planned change in
9483 behavior and considered a bugfix.
9484 * [`mem::align_of`] now specifies [the *minimum alignment* for
9485 T][align], which is usually the alignment programs are interested
9486 in, and the same value reported by clang's
9487 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9489 * [The `#[packed]` attribute is no longer silently accepted by the
9490 compiler][packed]. This attribute did nothing and code that
9491 mentioned it likely did not work as intended.
9492 * Associated type defaults are [now behind the
9493 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9494 defaults *did not work*, but could be mentioned syntactically. As
9495 such this breakage has minimal impact.
9500 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9501 matching against dereferenceable values.
9506 * The [`Extend`] trait, which grows a collection from an iterator, is
9507 implemented over iterators of references, for `String`, `Vec`,
9508 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9509 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9510 * The [`iter::once`] function returns an iterator that yields a single
9511 element, and [`iter::empty`] returns an iterator that yields no
9513 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9514 over substring matches.
9515 * [`Cell`] and [`RefCell`] both implement `Eq`.
9516 * A number of methods for wrapping arithmetic are added to the
9517 integral types, [`wrapping_div`], [`wrapping_rem`],
9518 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9519 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9520 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9521 type.. It is illegal for the default arithmetic operations in Rust
9522 to overflow; the desire to wrap must be explicit.
9523 * The `{:#?}` formatting specifier [displays the alternate,
9524 pretty-printed][debugfmt] form of the `Debug` formatter. This
9525 feature was actually introduced prior to 1.0 with little
9527 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9528 for writing data to formatted strings, similar to [`io::Write`].
9529 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9530 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9531 are used by code generators to emit implementations of [`Debug`].
9532 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9533 methods that convert case, following Unicode case mapping.
9534 * It is now easier to handle poisoned locks. The [`PoisonError`]
9535 type, returned by failing lock operations, exposes `into_inner`,
9536 `get_ref`, and `get_mut`, which all give access to the inner lock
9537 guard, and allow the poisoned lock to continue to operate. The
9538 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9539 poisoned lock without attempting to take the lock.
9540 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9541 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9542 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9543 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9545 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9551 * `rustc` employs smarter heuristics for guessing at [typos].
9552 * `rustc` emits more efficient code for [no-op conversions between
9553 unsafe pointers][nop].
9554 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9555 resulting in faster compile times and smaller code.
9557 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9558 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9559 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9560 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9561 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9562 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9563 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9564 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9565 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9566 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9567 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9568 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9569 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9570 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9571 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9572 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9573 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9574 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9575 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9576 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9577 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9578 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9579 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9580 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9581 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9582 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9583 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9584 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9585 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9586 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9587 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9588 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9589 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9590 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9591 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9592 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9593 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9594 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9595 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9596 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9597 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9598 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9599 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9600 [align]: https://github.com/rust-lang/rust/pull/25646
9601 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9602 [typos]: https://github.com/rust-lang/rust/pull/26087
9603 [nop]: https://github.com/rust-lang/rust/pull/26336
9604 [fat]: https://github.com/rust-lang/rust/pull/26411
9605 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9606 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9607 [packed]: https://github.com/rust-lang/rust/pull/25541
9608 [ad]: https://github.com/rust-lang/rust/pull/27382
9609 [win]: https://github.com/rust-lang/rust/pull/25350
9611 Version 1.1.0 (2015-06-25)
9612 =========================
9614 * ~850 changes, numerous bugfixes
9619 * The [`std::fs` module has been expanded][fs] to expand the set of
9620 functionality exposed:
9621 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9622 don't incur a syscall on some platforms.
9623 * A `symlink_metadata` function has been added.
9624 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9625 access to all underlying information.
9626 * The compiler now contains extended explanations of many errors. When an error
9627 with an explanation occurs the compiler suggests using the `--explain` flag
9628 to read the explanation. Error explanations are also [available online][err-index].
9629 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9630 well as other work, the time to bootstrap the compiler decreased by
9636 * The [`str::split_whitespace`] method splits a string on unicode
9637 whitespace boundaries.
9638 * On both Windows and Unix, new extension traits provide conversion of
9639 I/O types to and from the underlying system handles. On Unix, these
9640 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9641 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9642 `TcpListener`, and `UpdSocket`. Further implementations for
9643 `std::process` will be stabilized later.
9644 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9645 Windows, symlinks can be created with
9646 `std::os::windows::symlink_dir` and
9647 `std::os::windows::symlink_file`.
9648 * The `mpsc::Receiver` type can now be converted into an iterator with
9649 `into_iter` on the [`IntoIterator`] trait.
9650 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9651 implementation of the [`From`] trait.
9652 * The `Debug` implementation for `RangeFull` [creates output that is
9653 more consistent with other implementations][rf].
9654 * [`Debug` is implemented for `File`][file].
9655 * The `Default` implementation for `Arc` [no longer requires `Sync +
9657 * [The `Iterator` methods `count`, `nth`, and `last` have been
9658 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9659 * Incorrect handling of paths on Windows has been improved in both the
9660 compiler and the standard library.
9661 * [`AtomicPtr` gained a `Default` implementation][ap].
9662 * In accordance with Rust's policy on arithmetic overflow `abs` now
9663 [panics on overflow when debug assertions are enabled][abs].
9664 * The [`Cloned`] iterator, which was accidentally left unstable for
9665 1.0 [has been stabilized][c].
9666 * The [`Incoming`] iterator, which iterates over incoming TCP
9667 connections, and which was accidentally unnamable in 1.0, [is now
9668 properly exported][inc].
9669 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9670 `sift_up` or `sift_down` panic][bh].
9671 * The [`split_off`] method of `LinkedList` [no longer corrupts
9672 the list in certain scenarios][ll].
9677 * Type checking performance [has improved notably][sk] with
9678 [multiple improvements][pre].
9679 * The compiler [suggests code changes][ch] for more errors.
9680 * rustc and it's build system have experimental support for [building
9681 toolchains against MUSL][m] instead of glibc on Linux.
9682 * The compiler defines the `target_env` cfg value, which is used for
9683 distinguishing toolchains that are otherwise for the same
9684 platform. Presently this is set to `gnu` for common GNU Linux
9685 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9686 * The [`cargo rustc`][crc] command invokes a build with custom flags
9688 * [Android executables are always position independent][pie].
9689 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9690 with `Drop`][24935].
9692 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9693 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9694 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9695 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9696 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9697 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9698 [rf]: https://github.com/rust-lang/rust/pull/24491
9699 [err-index]: https://doc.rust-lang.org/error-index.html
9700 [sk]: https://github.com/rust-lang/rust/pull/24615
9701 [pre]: https://github.com/rust-lang/rust/pull/25323
9702 [file]: https://github.com/rust-lang/rust/pull/24598
9703 [ch]: https://github.com/rust-lang/rust/pull/24683
9704 [arc]: https://github.com/rust-lang/rust/pull/24695
9705 [si]: https://github.com/rust-lang/rust/pull/24701
9706 [ap]: https://github.com/rust-lang/rust/pull/24834
9707 [m]: https://github.com/rust-lang/rust/pull/24777
9708 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9709 [crc]: https://github.com/rust-lang/cargo/pull/1568
9710 [pie]: https://github.com/rust-lang/rust/pull/24953
9711 [abs]: https://github.com/rust-lang/rust/pull/25441
9712 [c]: https://github.com/rust-lang/rust/pull/25496
9713 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9714 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9715 [inc]: https://github.com/rust-lang/rust/pull/25522
9716 [bh]: https://github.com/rust-lang/rust/pull/25856
9717 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9718 [ll]: https://github.com/rust-lang/rust/pull/26022
9719 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9720 [24935]: https://github.com/rust-lang/rust/pull/24935
9722 Version 1.0.0 (2015-05-15)
9723 ========================
9725 * ~1500 changes, numerous bugfixes
9730 * The vast majority of the standard library is now `#[stable]`. It is
9731 no longer possible to use unstable features with a stable build of
9733 * Many popular crates on [crates.io] now work on the stable release
9735 * Arithmetic on basic integer types now [checks for overflow in debug
9741 * Several [restrictions have been added to trait coherence][coh] in
9742 order to make it easier for upstream authors to change traits
9743 without breaking downstream code.
9744 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9745 improve error messages and macro behavior. For example, `0b1234` is
9746 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9747 * Trait bounds [are always invariant][inv], eliminating the need for
9748 the `PhantomFn` and `MarkerTrait` lang items, which have been
9750 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9751 "foo" as bar` syntax has been replaced with `extern crate foo as
9752 bar`, and Cargo now automatically translates "-" in *package* names
9753 to underscore for the crate name.
9754 * [Lifetime shadowing is an error][lt].
9755 * [`Send` no longer implies `'static`][send-rfc].
9756 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9757 `MyType::default()`.
9758 * Primitive types [now have inherent methods][prim-inherent],
9759 obviating the need for extension traits like `SliceExt`.
9760 * Methods with `Self: Sized` in their `where` clause are [considered
9761 object-safe][self-sized], allowing many extension traits like
9762 `IteratorExt` to be merged into the traits they extended.
9763 * You can now [refer to associated types][assoc-where] whose
9764 corresponding trait bounds appear only in a `where` clause.
9765 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9766 like `Send` and `Sync` are now library-defined.
9767 * A [Reflect trait][reflect] was introduced, which means that
9768 downcasting via the `Any` trait is effectively limited to concrete
9769 types. This helps retain the potentially-important "parametricity"
9770 property: generic code cannot behave differently for different type
9771 arguments except in minor ways.
9772 * The `unsafe_destructor` feature is now deprecated in favor of the
9773 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9779 * The `thread_local` module [has been renamed to `std::thread`][th].
9780 * The methods of `IteratorExt` [have been moved to the `Iterator`
9781 trait itself][23300].
9782 * Several traits that implement Rust's conventions for type
9783 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9784 [centralized in the `std::convert` module][con].
9785 * The `FromError` trait [was removed in favor of `From`][fe].
9786 * The basic sleep function [has moved to
9787 `std::thread::sleep_ms`][slp].
9788 * The `splitn` function now takes an `n` parameter that represents the
9789 number of items yielded by the returned iterator [instead of the
9790 number of 'splits'][spl].
9791 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9792 * [Derived implementations of `PartialOrd` now order enums according
9793 to their explicitly-assigned discriminants][po].
9794 * [Methods for searching strings are generic over `Pattern`s][pat],
9795 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9797 * [In method resolution, object methods are resolved before inherent
9799 * [`String::from_str` has been deprecated in favor of the `From` impl,
9800 `String::from`][24517].
9801 * [`io::Error` implements `Sync`][ios].
9802 * [The `words` method on `&str` has been replaced with
9803 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9805 * The new path and IO modules are complete and `#[stable]`. This
9806 was the major library focus for this cycle.
9807 * The path API was [revised][path-normalize] to normalize `.`,
9808 adjusting the tradeoffs in favor of the most common usage.
9809 * A large number of remaining APIs in `std` were also stabilized
9810 during this cycle; about 75% of the non-deprecated API surface
9812 * The new [string pattern API][string-pattern] landed, which makes
9813 the string slice API much more internally consistent and flexible.
9814 * A new set of [generic conversion traits][conversion] replaced
9815 many existing ad hoc traits.
9816 * Generic numeric traits were [completely removed][num-traits]. This
9817 was made possible thanks to inherent methods for primitive types,
9818 and the removal gives maximal flexibility for designing a numeric
9819 hierarchy in the future.
9820 * The `Fn` traits are now related via [inheritance][fn-inherit]
9821 and provide ergonomic [blanket implementations][fn-blanket].
9822 * The `Index` and `IndexMut` traits were changed to
9823 [take the index by value][index-value], enabling code like
9824 `hash_map["string"]` to work.
9825 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9826 `Copy` data is known to be `Clone` as well.
9831 * Many errors now have extended explanations that can be accessed with
9832 the `--explain` flag to `rustc`.
9833 * Many new examples have been added to the standard library
9835 * rustdoc has received a number of improvements focused on completion
9837 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9838 * Much headway was made on ecosystem-wide CI, making it possible
9839 to [compare builds for breakage][ci-compare].
9842 [crates.io]: http://crates.io
9843 [clo]: https://github.com/rust-lang/rust/pull/24034
9844 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9845 [con]: https://github.com/rust-lang/rust/pull/23875
9846 [cr]: https://github.com/rust-lang/rust/pull/23419
9847 [fe]: https://github.com/rust-lang/rust/pull/23879
9848 [23300]: https://github.com/rust-lang/rust/pull/23300
9849 [inv]: https://github.com/rust-lang/rust/pull/23938
9850 [ios]: https://github.com/rust-lang/rust/pull/24133
9851 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9852 [lt]: https://github.com/rust-lang/rust/pull/24057
9853 [meth]: https://github.com/rust-lang/rust/pull/24056
9854 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9855 [po]: https://github.com/rust-lang/rust/pull/24270
9856 [24517]: https://github.com/rust-lang/rust/pull/24517
9857 [slp]: https://github.com/rust-lang/rust/pull/23949
9858 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9859 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9860 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9861 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9862 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9863 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9864 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9865 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9866 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9867 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9868 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9869 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9870 [reflect]: https://github.com/rust-lang/rust/pull/23712
9871 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9872 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9873 [index-value]: https://github.com/rust-lang/rust/pull/23601
9874 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9875 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9876 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9877 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9878 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9879 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9882 Version 1.0.0-alpha.2 (2015-02-20)
9883 =====================================
9885 * ~1300 changes, numerous bugfixes
9889 * The various I/O modules were [overhauled][io-rfc] to reduce
9890 unnecessary abstractions and provide better interoperation with
9891 the underlying platform. The old `io` module remains temporarily
9893 * The standard library now [participates in feature gating][feat],
9894 so use of unstable libraries now requires a `#![feature(...)]`
9895 attribute. The impact of this change is [described on the
9896 forum][feat-forum]. [RFC][feat-rfc].
9900 * `for` loops [now operate on the `IntoIterator` trait][into],
9901 which eliminates the need to call `.iter()`, etc. to iterate
9902 over collections. There are some new subtleties to remember
9903 though regarding what sort of iterators various types yield, in
9904 particular that `for foo in bar { }` yields values from a move
9905 iterator, destroying the original collection. [RFC][into-rfc].
9906 * Objects now have [default lifetime bounds][obj], so you don't
9907 have to write `Box<Trait+'static>` when you don't care about
9908 storing references. [RFC][obj-rfc].
9909 * In types that implement `Drop`, [lifetimes must outlive the
9910 value][drop]. This will soon make it possible to safely
9911 implement `Drop` for types where `#[unsafe_destructor]` is now
9912 required. Read the [gorgeous RFC][drop-rfc] for details.
9913 * The fully qualified <T as Trait>::X syntax lets you set the Self
9914 type for a trait method or associated type. [RFC][ufcs-rfc].
9915 * References to types that implement `Deref<U>` now [automatically
9916 coerce to references][deref] to the dereferenced type `U`,
9917 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9918 should eliminate many unsightly uses of `&*`, as when converting
9919 from references to vectors into references to
9920 slices. [RFC][deref-rfc].
9921 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9922 `|:|`) is obsolete and closure kind is inferred from context.
9923 * [`Self` is a keyword][Self].
9927 * The `Show` and `String` formatting traits [have been
9928 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9929 their related purposes. Automatically getting a string
9930 conversion to use with `format!("{:?}", something_to_debug)` is
9931 now written `#[derive(Debug)]`.
9932 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9933 OsStr}`, provide strings in platform-specific encodings for easier
9934 interop with system APIs. [RFC][osstr-rfc].
9935 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9936 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9937 creating raw pointers.
9941 * Certain long error messages of the form 'expected foo found bar'
9942 are now [split neatly across multiple
9943 lines][multiline]. Examples in the PR.
9944 * On Unix Rust can be [uninstalled][un] by running
9945 `/usr/local/lib/rustlib/uninstall.sh`.
9946 * The `#[rustc_on_unimplemented]` attribute, requiring the
9947 'on_unimplemented' feature, lets rustc [display custom error
9948 messages when a trait is expected to be implemented for a type
9953 * Rust is tested against a [LALR grammar][lalr], which parses
9954 almost all the Rust files that rustc does.
9956 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9957 [close]: https://github.com/rust-lang/rust/pull/21843
9958 [deref]: https://github.com/rust-lang/rust/pull/21351
9959 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9960 [drop]: https://github.com/rust-lang/rust/pull/21972
9961 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9962 [feat]: https://github.com/rust-lang/rust/pull/21248
9963 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9964 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9965 [fmt]: https://github.com/rust-lang/rust/pull/21457
9966 [into]: https://github.com/rust-lang/rust/pull/20790
9967 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9968 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9969 [lalr]: https://github.com/rust-lang/rust/pull/21452
9970 [multiline]: https://github.com/rust-lang/rust/pull/19870
9971 [obj]: https://github.com/rust-lang/rust/pull/22230
9972 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9973 [onun]: https://github.com/rust-lang/rust/pull/20889
9974 [osstr]: https://github.com/rust-lang/rust/pull/21488
9975 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9976 [Self]: https://github.com/rust-lang/rust/pull/22158
9977 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9978 [un]: https://github.com/rust-lang/rust/pull/22256
9981 Version 1.0.0-alpha (2015-01-09)
9982 ==================================
9984 * ~2400 changes, numerous bugfixes
9988 * The language itself is considered feature complete for 1.0,
9989 though there will be many usability improvements and bugfixes
9990 before the final release.
9991 * Nearly 50% of the public API surface of the standard library has
9992 been declared 'stable'. Those interfaces are unlikely to change
9994 * The long-running debate over integer types has been
9995 [settled][ints]: Rust will ship with types named `isize` and
9996 `usize`, rather than `int` and `uint`, for pointer-sized
9997 integers. Guidelines will be rolled out during the alpha cycle.
9998 * Most crates that are not `std` have been moved out of the Rust
9999 distribution into the Cargo ecosystem so they can evolve
10000 separately and don't need to be stabilized as quickly, including
10001 'time', 'getopts', 'num', 'regex', and 'term'.
10002 * Documentation continues to be expanded with more API coverage, more
10003 examples, and more in-depth explanations. The guides have been
10004 consolidated into [The Rust Programming Language][trpl].
10005 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10006 * All official Rust binary installers now come with [Cargo], the
10007 Rust package manager.
10011 * Closures have been [completely redesigned][unboxed] to be
10012 implemented in terms of traits, can now be used as generic type
10013 bounds and thus monomorphized and inlined, or via an opaque
10014 pointer (boxed) as in the old system. The new system is often
10015 referred to as 'unboxed' closures.
10016 * Traits now support [associated types][assoc], allowing families
10017 of related types to be defined together and used generically in
10019 * Enum variants are [namespaced by their type names][enum].
10020 * [`where` clauses][where] provide a more versatile and attractive
10021 syntax for specifying generic bounds, though the previous syntax
10023 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10025 * Rust [no longer has a runtime][rt] of any description, and only
10026 supports OS threads, not green threads.
10027 * At long last, Rust has been overhauled for 'dynamically-sized
10028 types' ([DST]), which integrates 'fat pointers' (object types,
10029 arrays, and `str`) more deeply into the type system, making it
10031 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10032 `..j` that produce range types and which, when combined with the
10033 `Index` operator and multidispatch, leads to a convenient slice
10034 notation, `[i..j]`.
10035 * The new range syntax revealed an ambiguity in the fixed-length
10036 array syntax, so now fixed length arrays [are written `[T;
10038 * The `Copy` trait is no longer implemented automatically. Unsafe
10039 pointers no longer implement `Sync` and `Send` so types
10040 containing them don't automatically either. `Sync` and `Send`
10041 are now 'unsafe traits' so one can "forcibly" implement them via
10042 `unsafe impl` if a type confirms to the requirements for them
10043 even though the internals do not (e.g. structs containing unsafe
10044 pointers like `Arc`). These changes are intended to prevent some
10045 footguns and are collectively known as [opt-in built-in
10046 traits][oibit] (though `Sync` and `Send` will soon become pure
10047 library types unknown to the compiler).
10048 * Operator traits now take their operands [by value][ops], and
10049 comparison traits can use multidispatch to compare one type
10050 against multiple other types, allowing e.g. `String` to be
10051 compared with `&str`.
10052 * `if let` and `while let` are no longer feature-gated.
10053 * Rust has adopted a more [uniform syntax for escaping unicode
10054 characters][unicode].
10055 * `macro_rules!` [has been declared stable][mac]. Though it is a
10056 flawed system it is sufficiently popular that it must be usable
10057 for 1.0. Effort has gone into [future-proofing][mac-future] it
10058 in ways that will allow other macro systems to be developed in
10059 parallel, and won't otherwise impact the evolution of the
10061 * The prelude has been [pared back significantly][prelude] such
10062 that it is the minimum necessary to support the most pervasive
10063 code patterns, and through [generalized where clauses][where]
10064 many of the prelude extension traits have been consolidated.
10065 * Rust's rudimentary reflection [has been removed][refl], as it
10066 incurred too much code generation for little benefit.
10067 * [Struct variants][structvars] are no longer feature-gated.
10068 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10069 known as 'higher-ranked trait bounds', this crucially allows
10070 unboxed closures to work.
10071 * Macros invocations surrounded by parens or square brackets and
10072 not terminated by a semicolon are [parsed as
10073 expressions][macros], which makes expressions like `vec![1i32,
10074 2, 3].len()` work as expected.
10075 * Trait objects now implement their traits automatically, and
10076 traits that can be coerced to objects now must be [object
10078 * Automatically deriving traits is now done with `#[derive(...)]`
10079 not `#[deriving(...)]` for [consistency with other naming
10080 conventions][derive].
10081 * Importing the containing module or enum at the same time as
10082 items or variants they contain is [now done with `self` instead
10083 of `mod`][self], as in use `foo::{self, bar}`
10084 * Glob imports are no longer feature-gated.
10085 * The `box` operator and `box` patterns have been feature-gated
10086 pending a redesign. For now unique boxes should be allocated
10087 like other containers, with `Box::new`.
10091 * A [series][coll1] of [efforts][coll2] to establish
10092 [conventions][coll3] for collections types has resulted in API
10093 improvements throughout the standard library.
10094 * New [APIs for error handling][err] provide ergonomic interop
10095 between error types, and [new conventions][err-conv] describe
10096 more clearly the recommended error handling strategies in Rust.
10097 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10098 it is easier to discuss failure in the context of error handling
10099 without making clarifications as to whether you are referring to
10100 the 'fail' macro or failure more generally.
10101 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10102 syscall when available.
10103 * The 'serialize' crate has been renamed 'rustc-serialize' and
10104 moved out of the distribution to Cargo. Although it is widely
10105 used now, it is expected to be superseded in the near future.
10106 * The `Show` formatter, typically implemented with
10107 `#[derive(Show)]` is [now requested with the `{:?}`
10108 specifier][show] and is intended for use by all types, for uses
10109 such as `println!` debugging. The new `String` formatter must be
10110 implemented by hand, uses the `{}` specifier, and is intended
10111 for full-fidelity conversions of things that can logically be
10112 represented as strings.
10116 * [Flexible target specification][flex] allows rustc's code
10117 generation to be configured to support otherwise-unsupported
10119 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10120 respective debuggers with Rust-appropriate pretty-printing.
10121 * The Windows installation of Rust is distributed with the
10122 MinGW components currently required to link binaries on that
10127 * Nullable enum optimizations have been extended to more types so
10128 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10129 space than the inner types themselves.
10130 * Work has begun on supporting AArch64.
10132 [Cargo]: https://crates.io
10133 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10134 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10135 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10136 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10137 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10138 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10139 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10140 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10141 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10142 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10143 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10144 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10145 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10146 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10147 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10148 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10149 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10150 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10151 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10152 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10153 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10154 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10155 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10156 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10157 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10158 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10159 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10160 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10161 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10162 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10163 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10164 [trpl]: https://doc.rust-lang.org/book/index.html
10165 [rbe]: http://rustbyexample.com/
10168 Version 0.12.0 (2014-10-09)
10169 =============================
10171 * ~1900 changes, numerous bugfixes
10175 * The introductory documentation (now called The Rust Guide) has
10176 been completely rewritten, as have a number of supplementary
10178 * Rust's package manager, Cargo, continues to improve and is
10179 sometimes considered to be quite awesome.
10180 * Many API's in `std` have been reviewed and updated for
10181 consistency with the in-development Rust coding
10182 guidelines. The standard library documentation tracks
10183 stabilization progress.
10184 * Minor libraries have been moved out-of-tree to the rust-lang org
10185 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10186 be installed with Cargo.
10187 * Lifetime elision allows lifetime annotations to be left off of
10188 function declarations in many common scenarios.
10189 * Rust now works on 64-bit Windows.
10192 * Indexing can be overloaded with the `Index` and `IndexMut`
10194 * The `if let` construct takes a branch only if the `let` pattern
10195 matches, currently behind the 'if_let' feature gate.
10196 * 'where clauses', a more flexible syntax for specifying trait
10197 bounds that is more aesthetic, have been added for traits and
10198 free functions. Where clauses will in the future make it
10199 possible to constrain associated types, which would be
10200 impossible with the existing syntax.
10201 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10202 the 'slicing_syntax' feature gate, and can be overloaded with
10203 the `Slice` or `SliceMut` traits.
10204 * The syntax for matching of sub-slices has been changed to use a
10205 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10206 consistency with other uses of `..` and to future-proof
10207 potential additional uses of the syntax.
10208 * The syntax for matching inclusive ranges in patterns has changed
10209 from `0..3` to `0...4` to be consistent with the exclusive range
10210 syntax for slicing.
10211 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10212 c]`) has been put behind the 'advanced_slice_patterns' feature
10213 gate and may be removed in the future.
10214 * Components of tuples and tuple structs can be extracted using
10215 the `value.0` syntax, currently behind the `tuple_indexing`
10217 * The `#[crate_id]` attribute is no longer supported; versioning
10218 is handled by the package manager.
10219 * Renaming crate imports are now written `extern crate foo as bar`
10220 instead of `extern crate bar = foo`.
10221 * Renaming use statements are now written `use foo as bar` instead
10222 of `use bar = foo`.
10223 * `let` and `match` bindings and argument names in macros are now
10225 * The new, more efficient, closure types ('unboxed closures') have
10226 been added under a feature gate, 'unboxed_closures'. These will
10227 soon replace the existing closure types, once higher-ranked
10228 trait lifetimes are added to the language.
10229 * `move` has been added as a keyword, for indicating closures
10230 that capture by value.
10231 * Mutation and assignment is no longer allowed in pattern guards.
10232 * Generic structs and enums can now have trait bounds.
10233 * The `Share` trait is now called `Sync` to free up the term
10234 'shared' to refer to 'shared reference' (the default reference
10236 * Dynamically-sized types have been mostly implemented,
10237 unifying the behavior of fat-pointer types with the rest of the
10239 * As part of dynamically-sized types, the `Sized` trait has been
10240 introduced, which qualifying types implement by default, and
10241 which type parameters expect by default. To specify that a type
10242 parameter does not need to be sized, write `<Sized? T>`. Most
10243 types are `Sized`, notable exceptions being unsized arrays
10244 (`[T]`) and trait types.
10245 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10246 * Lifetime bounds can now be applied to type parameters and object
10248 * The old, reference counted GC type, `Gc<T>` which was once
10249 denoted by the `@` sigil, has finally been removed. GC will be
10250 revisited in the future.
10253 * Library documentation has been improved for a number of modules.
10254 * Bit-vectors, collections::bitv has been modernized.
10255 * The url crate is deprecated in favor of
10256 http://github.com/servo/rust-url, which can be installed with
10258 * Most I/O stream types can be cloned and subsequently closed from
10259 a different thread.
10260 * A `std::time::Duration` type has been added for use in I/O
10261 methods that rely on timers, as well as in the 'time' crate's
10262 `Timespec` arithmetic.
10263 * The runtime I/O abstraction layer that enabled the green thread
10264 scheduler to do non-thread-blocking I/O has been removed, along
10265 with the libuv-based implementation employed by the green thread
10266 scheduler. This will greatly simplify the future I/O work.
10267 * `collections::btree` has been rewritten to have a more
10268 idiomatic and efficient design.
10271 * rustdoc output now indicates the stability levels of API's.
10272 * The `--crate-name` flag can specify the name of the crate
10273 being compiled, like `#[crate_name]`.
10274 * The `-C metadata` specifies additional metadata to hash into
10275 symbol names, and `-C extra-filename` specifies additional
10276 information to put into the output filename, for use by the
10277 package manager for versioning.
10278 * debug info generation has continued to improve and should be
10279 more reliable under both gdb and lldb.
10280 * rustc has experimental support for compiling in parallel
10281 using the `-C codegen-units` flag.
10282 * rustc no longer encodes rpath information into binaries by
10286 * Stack usage has been optimized with LLVM lifetime annotations.
10287 * Official Rust binaries on Linux are more compatible with older
10288 kernels and distributions, built on CentOS 5.10.
10291 Version 0.11.0 (2014-07-02)
10292 ==========================
10294 * ~1700 changes, numerous bugfixes
10297 * ~[T] has been removed from the language. This type is superseded by
10299 * ~str has been removed from the language. This type is superseded by
10301 * ~T has been removed from the language. This type is superseded by the
10303 * @T has been removed from the language. This type is superseded by the
10304 standard library's std::gc::Gc<T> type.
10305 * Struct fields are now all private by default.
10306 * Vector indices and shift amounts are both required to be a `uint`
10307 instead of any integral type.
10308 * Byte character, byte string, and raw byte string literals are now all
10309 supported by prefixing the normal literal with a `b`.
10310 * Multiple ABIs are no longer allowed in an ABI string
10311 * The syntax for lifetimes on closures/procedures has been tweaked
10312 slightly: `<'a>|A, B|: 'b + K -> T`
10313 * Floating point modulus has been removed from the language; however it
10314 is still provided by a library implementation.
10315 * Private enum variants are now disallowed.
10316 * The `priv` keyword has been removed from the language.
10317 * A closure can no longer be invoked through a &-pointer.
10318 * The `use foo, bar, baz;` syntax has been removed from the language.
10319 * The transmute intrinsic no longer works on type parameters.
10320 * Statics now allow blocks/items in their definition.
10321 * Trait bounds are separated from objects with + instead of : now.
10322 * Objects can no longer be read while they are mutably borrowed.
10323 * The address of a static is now marked as insignificant unless the
10324 #[inline(never)] attribute is placed it.
10325 * The #[unsafe_destructor] attribute is now behind a feature gate.
10326 * Struct literals are no longer allowed in ambiguous positions such as
10327 if, while, match, and for..in.
10328 * Declaration of lang items and intrinsics are now feature-gated by
10330 * Integral literals no longer default to `int`, and floating point
10331 literals no longer default to `f64`. Literals must be suffixed with an
10332 appropriate type if inference cannot determine the type of the
10334 * The Box<T> type is no longer implicitly borrowed to &mut T.
10335 * Procedures are now required to not capture borrowed references.
10338 * The standard library is now a "facade" over a number of underlying
10339 libraries. This means that development on the standard library should
10340 be speedier due to smaller crates, as well as a clearer line between
10342 * A new library, libcore, lives under the standard library's facade
10343 which is Rust's "0-assumption" library, suitable for embedded and
10344 kernel development for example.
10345 * A regex crate has been added to the standard distribution. This crate
10346 includes statically compiled regular expressions.
10347 * The unwrap/unwrap_err methods on Result require a Show bound for
10348 better error messages.
10349 * The return types of the std::comm primitives have been centralized
10350 around the Result type.
10351 * A number of I/O primitives have gained the ability to time out their
10353 * A number of I/O primitives have gained the ability to close their
10354 reading/writing halves to cancel pending operations.
10355 * Reverse iterator methods have been removed in favor of `rev()` on
10356 their forward-iteration counterparts.
10357 * A bitflags! macro has been added to enable easy interop with C and
10358 management of bit flags.
10359 * A debug_assert! macro is now provided which is disabled when
10360 `--cfg ndebug` is passed to the compiler.
10361 * A graphviz crate has been added for creating .dot files.
10362 * The std::cast module has been migrated into std::mem.
10363 * The std::local_data api has been migrated from freestanding functions
10364 to being based on methods.
10365 * The Pod trait has been renamed to Copy.
10366 * jemalloc has been added as the default allocator for types.
10367 * The API for allocating memory has been changed to use proper alignment
10368 and sized deallocation
10369 * Connecting a TcpStream or binding a TcpListener is now based on a
10370 string address and a u16 port. This allows connecting to a hostname as
10372 * The Reader trait now contains a core method, read_at_least(), which
10373 correctly handles many repeated 0-length reads.
10374 * The process-spawning API is now centered around a builder-style
10376 * The :? printing qualifier has been moved from the standard library to
10377 an external libdebug crate.
10378 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10379 have been renamed to Eq/Ord.
10380 * The select/plural methods have been removed from format!. The escapes
10381 for { and } have also changed from \{ and \} to {{ and }},
10383 * The TaskBuilder API has been re-worked to be a true builder, and
10384 extension traits for spawning native/green tasks have been added.
10387 * All breaking changes to the language or libraries now have their
10388 commit message annotated with `[breaking-change]` to allow for easy
10389 discovery of breaking changes.
10390 * The compiler will now try to suggest how to annotate lifetimes if a
10391 lifetime-related error occurs.
10392 * Debug info continues to be improved greatly with general bug fixes and
10393 better support for situations like link time optimization (LTO).
10394 * Usage of syntax extensions when cross-compiling has been fixed.
10395 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10396 -fdata-sections and --gc-sections has been enabled by default
10397 * The compiler is now stricter about where it will load module files
10398 from when a module is declared via `mod foo;`.
10399 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10400 Syntax extensions are now discovered via a "plugin registrar" type
10401 which will be extended in the future to other various plugins.
10402 * Lints have been restructured to allow for dynamically loadable lints.
10403 * A number of rustdoc improvements:
10404 * The HTML output has been visually redesigned.
10405 * Markdown is now powered by hoedown instead of sundown.
10406 * Searching heuristics have been greatly improved.
10407 * The search index has been reduced in size by a great amount.
10408 * Cross-crate documentation via `pub use` has been greatly improved.
10409 * Primitive types are now hyperlinked and documented.
10410 * Documentation has been moved from static.rust-lang.org/doc to
10412 * A new sandbox, play.rust-lang.org, is available for running and
10413 sharing rust code examples on-line.
10414 * Unused attributes are now more robustly warned about.
10415 * The dead_code lint now warns about unused struct fields.
10416 * Cross-compiling to iOS is now supported.
10417 * Cross-compiling to mipsel is now supported.
10418 * Stability attributes are now inherited by default and no longer apply
10419 to intra-crate usage, only inter-crate usage.
10420 * Error message related to non-exhaustive match expressions have been
10424 Version 0.10 (2014-04-03)
10425 =========================
10427 * ~1500 changes, numerous bugfixes
10430 * A new RFC process is now in place for modifying the language.
10431 * Patterns with `@`-pointers have been removed from the language.
10432 * Patterns with unique vectors (`~[T]`) have been removed from the
10434 * Patterns with unique strings (`~str`) have been removed from the
10436 * `@str` has been removed from the language.
10437 * `@[T]` has been removed from the language.
10438 * `@self` has been removed from the language.
10439 * `@Trait` has been removed from the language.
10440 * Headers on `~` allocations which contain `@` boxes inside the type for
10441 reference counting have been removed.
10442 * The semantics around the lifetimes of temporary expressions have changed,
10443 see #3511 and #11585 for more information.
10444 * Cross-crate syntax extensions are now possible, but feature gated. See
10445 #11151 for more information. This includes both `macro_rules!` macros as
10446 well as syntax extensions such as `format!`.
10447 * New lint modes have been added, and older ones have been turned on to be
10449 * Unnecessary parentheses
10450 * Uppercase statics
10452 * Uppercase variables
10453 * Publicly visible private types
10454 * `#[deriving]` with raw pointers
10455 * Unsafe functions can no longer be coerced to closures.
10456 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10457 * The `#[simd]` attribute is now behind a feature gate.
10458 * Visibility is no longer allowed on `extern crate` statements, and
10459 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10460 * Trailing commas are now allowed in argument lists and tuple patterns.
10461 * The `do` keyword has been removed, it is now a reserved keyword.
10462 * Default type parameters have been implemented, but are feature gated.
10463 * Borrowed variables through captures in closures are now considered soundly.
10464 * `extern mod` is now `extern crate`
10465 * The `Freeze` trait has been removed.
10466 * The `Share` trait has been added for types that can be shared among
10468 * Labels in macros are now hygienic.
10469 * Expression/statement macro invocations can be delimited with `{}` now.
10470 * Treatment of types allowed in `static mut` locations has been tweaked.
10471 * The `*` and `.` operators are now overloadable through the `Deref` and
10473 * `~Trait` and `proc` no longer have `Send` bounds by default.
10474 * Partial type hints are now supported with the `_` type marker.
10475 * An `Unsafe` type was introduced for interior mutability. It is now
10476 considered undefined to transmute from `&T` to `&mut T` without using the
10478 * The #[linkage] attribute was implemented for extern statics/functions.
10479 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10480 * `Pod` was renamed to `Copy`.
10483 * The `libextra` library has been removed. It has now been decomposed into
10484 component libraries with smaller and more focused nuggets of
10485 functionality. The full list of libraries can be found on the
10486 documentation index page.
10487 * std: `std::condition` has been removed. All I/O errors are now propagated
10488 through the `Result` type. In order to assist with error handling, a
10489 `try!` macro for unwrapping errors with an early return and a lint for
10490 unused results has been added. See #12039 for more information.
10491 * std: The `vec` module has been renamed to `slice`.
10492 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10493 This will become the only growable vector in the future.
10494 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10495 are now found at `std::io::BufferedReader` instead of
10496 `std::io::buffered::BufferedReader`.
10497 * std: `print` and `println` are no longer in the prelude, the `print!` and
10498 `println!` macros are intended to be used instead.
10499 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10500 attempts to statically prevent cycles.
10501 * std: The standard distribution is adopting the policy of pushing failure
10502 to the user rather than failing in libraries. Many functions (such as
10503 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10504 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10505 deriving mode: `#[deriving(Show)]`.
10506 * std: `ToStr` is now implemented for all types implementing `Show`.
10507 * std: The formatting trait methods now take `&self` instead of `&T`
10508 * std: The `invert()` method on iterators has been renamed to `rev()`
10509 * std: `std::num` has seen a reduction in the genericity of its traits,
10510 consolidating functionality into a few core traits.
10511 * std: Backtraces are now printed on task failure if the environment
10512 variable `RUST_BACKTRACE` is present.
10513 * std: Naming conventions for iterators have been standardized. More details
10514 can be found on the wiki's style guide.
10515 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10516 still implement the function.
10517 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10518 * std: `assert_approx_eq!` has been removed
10519 * std: The `e` and `E` formatting specifiers for floats have been added to
10520 print them in exponential notation.
10521 * std: The `Times` trait has been removed
10522 * std: Indications of variance and opting out of builtin bounds is done
10523 through marker types in `std::kinds::marker` now
10524 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10525 `#[deriving(Hash)]` is now possible.
10526 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10527 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10528 * std: `Chan::new` is now `channel()`.
10529 * std: A new synchronous channel type has been implemented.
10530 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10531 * std: `hashmap` and `trie` have been moved to `libcollections`
10532 * std: `run` has been rolled into `io::process`
10533 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10534 * std: The equality and comparison traits have seen some reorganization.
10535 * std: `rand` has moved to `librand`.
10536 * std: `to_{lower,upper}case` has been implemented for `char`.
10537 * std: Logging has been moved to `liblog`.
10538 * collections: `HashMap` has been rewritten for higher performance and less
10540 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10541 it can be booted manually. The runtime guide has more information and
10543 * native: All I/O functionality except signals has been implemented.
10544 * green: Task spawning with `libgreen` has been optimized with stack caching
10545 and various trimming of code.
10546 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10547 * sync: The `extra::sync` module has been updated to modern rust (and moved
10548 to the `sync` library), tweaking and improving various interfaces while
10549 dropping redundant functionality.
10550 * sync: A new `Barrier` type has been added to the `sync` library.
10551 * sync: An efficient mutex for native and green tasks has been implemented.
10552 * serialize: The `base64` module has seen some improvement. It treats
10553 newlines better, has non-string error values, and has seen general
10555 * fourcc: A `fourcc!` macro was introduced
10556 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10557 hexadecimal literal.
10560 * `rustpkg` has been deprecated and removed from the main repository. Its
10561 replacement, `cargo`, is under development.
10562 * Nightly builds of rust are now available
10563 * The memory usage of rustc has been improved many times throughout this
10565 * The build process supports disabling rpath support for the rustc binary
10567 * Code generation has improved in some cases, giving more information to the
10568 LLVM optimization passes to enable more extensive optimizations.
10569 * Debuginfo compatibility with lldb on OSX has been restored.
10570 * The master branch is now gated on an android bot, making building for
10571 android much more reliable.
10572 * Output flags have been centralized into one `--emit` flag.
10573 * Crate type flags have been centralized into one `--crate-type` flag.
10574 * Codegen flags have been consolidated behind a `-C` flag.
10575 * Linking against outdated crates now has improved error messages.
10576 * Error messages with lifetimes will often suggest how to annotate the
10577 function to fix the error.
10578 * Many more types are documented in the standard library, and new guides
10580 * Many `rustdoc` improvements:
10581 * code blocks are syntax highlighted.
10582 * render standalone markdown files.
10583 * the --test flag tests all code blocks by default.
10584 * exported macros are displayed.
10585 * re-exported types have their documentation inlined at the location of the
10587 * search works across crates that have been rendered to the same output
10591 Version 0.9 (2014-01-09)
10592 ==========================
10594 * ~1800 changes, numerous bugfixes
10597 * The `float` type has been removed. Use `f32` or `f64` instead.
10598 * A new facility for enabling experimental features (feature gating) has
10599 been added, using the crate-level `#[feature(foo)]` attribute.
10600 * Managed boxes (@) are now behind a feature gate
10601 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10602 standard library's `Gc` or `Rc` types instead.
10603 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10604 * Jumping back to the top of a loop is now done with `continue` instead of
10606 * Strings can no longer be mutated through index assignment.
10607 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10608 hash delimiters, as in `r###"foo"###`.
10609 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10611 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10612 * `@fn`s have been removed.
10613 * `do` only works with procs in order to make it obvious what the cost
10615 * Single-element tuple-like structs can no longer be dereferenced to
10616 obtain the inner value. A more comprehensive solution for overloading
10617 the dereference operator will be provided in the future.
10618 * The `#[link(...)]` attribute has been replaced with
10619 `#[crate_id = "name#vers"]`.
10620 * Empty `impl`s must be terminated with empty braces and may not be
10621 terminated with a semicolon.
10622 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10623 no longer has any special meaning.
10624 * The old `fmt!` string formatting macro has been removed.
10625 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10626 `print!` and `println!`.
10627 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10628 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10629 `extern mod foo = "bar"` instead.
10630 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10631 * Macros can have attributes.
10632 * Macros can expand to items with attributes.
10633 * Macros can expand to multiple items.
10634 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10635 * Comments may be nested.
10636 * Values automatically coerce to trait objects they implement, without
10638 * Enum discriminants are no longer an entire word but as small as needed to
10639 contain all the variants. The `repr` attribute can be used to override
10640 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10641 `#[repr(C)]` to match C enums.
10642 * Non-string literals are not allowed in attributes (they never worked).
10643 * The FFI now supports variadic functions.
10644 * Octal numeric literals, as in `0o7777`.
10645 * The `concat!` syntax extension performs compile-time string concatenation.
10646 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10647 removed as Rust no longer uses segmented stacks.
10648 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10649 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10650 not `*`; ignoring remaining fields of a struct is also done with `..`,
10651 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10652 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10653 * `rustc` supports the "system" calling convention, which defaults to the
10654 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10656 * The `type_overflow` lint (default: warn) checks literals for overflow.
10657 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10658 * The `attribute_usage` lint (default: warn) warns about unknown
10660 * The `unknown_features` lint (default: warn) warns about unknown
10662 * The `dead_code` lint (default: warn) checks for dead code.
10663 * Rust libraries can be linked statically to one another
10664 * `#[link_args]` is behind the `link_args` feature gate.
10665 * Native libraries are now linked with `#[link(name = "foo")]`
10666 * Native libraries can be statically linked to a rust crate
10667 (`#[link(name = "foo", kind = "static")]`).
10668 * Native OS X frameworks are now officially supported
10669 (`#[link(name = "foo", kind = "framework")]`).
10670 * The `#[thread_local]` attribute creates thread-local (not task-local)
10671 variables. Currently behind the `thread_local` feature gate.
10672 * The `return` keyword may be used in closures.
10673 * Types that can be copied via a memcpy implement the `Pod` kind.
10674 * The `cfg` attribute can now be used on struct fields and enum variants.
10677 * std: The `option` and `result` API's have been overhauled to make them
10678 simpler, more consistent, and more composable.
10679 * std: The entire `std::io` module has been replaced with one that is
10680 more comprehensive and that properly interfaces with the underlying
10681 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10683 * std: `io::util` contains a number of useful implementations of
10684 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10685 `ZeroReader`, `TeeReader`.
10686 * std: The reference counted pointer type `extra::rc` moved into std.
10687 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10688 just a wrapper around it).
10689 * std: The `Either` type has been removed.
10690 * std: `fmt::Default` can be implemented for any type to provide default
10691 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10692 * std: The `rand` API continues to be tweaked.
10693 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10694 on failure in gdb, is now named `rust_fail`.
10695 * std: The `each_key` and `each_value` methods on `HashMap` have been
10696 replaced by the `keys` and `values` iterators.
10697 * std: Functions dealing with type size and alignment have moved from the
10698 `sys` module to the `mem` module.
10699 * std: The `path` module was written and API changed.
10700 * std: `str::from_utf8` has been changed to cast instead of allocate.
10701 * std: `starts_with` and `ends_with` methods added to vectors via the
10702 `ImmutableEqVector` trait, which is in the prelude.
10703 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10704 if the index is out of bounds.
10705 * std: Task failure no longer propagates between tasks, as the model was
10706 complex, expensive, and incompatible with thread-based tasks.
10707 * std: The `Any` type can be used for dynamic typing.
10708 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10710 * std: Methods that produce iterators generally do not have an `_iter`
10712 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10713 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10714 * std: `util::ignore` renamed to `prelude::drop`.
10715 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10717 * std: `vec::raw` has seen a lot of cleanup and API changes.
10718 * std: The standard library no longer includes any C++ code, and very
10719 minimal C, eliminating the dependency on libstdc++.
10720 * std: Runtime scheduling and I/O functionality has been factored out into
10721 extensible interfaces and is now implemented by two different crates:
10722 libnative, for native threading and I/O; and libgreen, for green threading
10723 and I/O. This paves the way for using the standard library in more limited
10724 embedded environments.
10725 * std: The `comm` module has been rewritten to be much faster, have a
10726 simpler, more consistent API, and to work for both native and green
10728 * std: All libuv dependencies have been moved into the rustuv crate.
10729 * native: New implementations of runtime scheduling on top of OS threads.
10730 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10732 * green: The green thread scheduler and message passing types are almost
10733 entirely lock-free.
10734 * extra: The `flatpipes` module had bitrotted and was removed.
10735 * extra: All crypto functions have been removed and Rust now has a policy of
10736 not reimplementing crypto in the standard library. In the future crypto
10737 will be provided by external crates with bindings to established libraries.
10738 * extra: `c_vec` has been modernized.
10739 * extra: The `sort` module has been removed. Use the `sort` method on
10743 * The `rust` and `rusti` commands have been removed, due to lack of
10745 * `rustdoc` was completely rewritten.
10746 * `rustdoc` can test code examples in documentation.
10747 * `rustpkg` can test packages with the argument, 'test'.
10748 * `rustpkg` supports arbitrary dependencies, including C libraries.
10749 * `rustc`'s support for generating debug info is improved again.
10750 * `rustc` has better error reporting for unbalanced delimiters.
10751 * `rustc`'s JIT support was removed due to bitrot.
10752 * Executables and static libraries can be built with LTO (-Z lto)
10753 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10757 Version 0.8 (2013-09-26)
10758 ============================
10760 * ~2200 changes, numerous bugfixes
10763 * The `for` loop syntax has changed to work with the `Iterator` trait.
10764 * At long last, unwinding works on Windows.
10765 * Default methods are ready for use.
10766 * Many trait inheritance bugs fixed.
10767 * Owned and borrowed trait objects work more reliably.
10768 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10769 * rustc can omit emission of code for the `debug!` macro if it is passed
10771 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10772 for foo.rs, then foo/mod.rs, and will generate an error when both are
10774 * Strings no longer contain trailing nulls. The new `std::c_str` module
10775 provides new mechanisms for converting to C strings.
10776 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10777 * The FFI has been overhauled such that foreign functions are called directly,
10778 instead of through a stack-switching wrapper.
10779 * Calling a foreign function must be done through a Rust function with the
10780 `#[fixed_stack_segment]` attribute.
10781 * The `externfn!` macro can be used to declare both a foreign function and
10782 a `#[fixed_stack_segment]` wrapper at once.
10783 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10784 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10785 * `priv` is disallowed everywhere except for struct fields and enum variants.
10786 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10787 * `ref` bindings in irrefutable patterns work correctly now.
10788 * `char` is now prevented from containing invalid code points.
10789 * Casting to `bool` is no longer allowed.
10790 * `\0` is now accepted as an escape in chars and strings.
10791 * `yield` is a reserved keyword.
10792 * `typeof` is a reserved keyword.
10793 * Crates may be imported by URL with `extern mod foo = "url";`.
10794 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10795 * Static vectors can be initialized with repeating elements,
10796 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10797 * Static structs can be initialized with functional record update,
10798 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10799 * `cfg!` can be used to conditionally execute code based on the crate
10800 configuration, similarly to `#[cfg(...)]`.
10801 * The `unnecessary_qualification` lint detects unneeded module
10802 prefixes (default: allow).
10803 * Arithmetic operations have been implemented on the SIMD types in
10804 `std::unstable::simd`.
10805 * Exchange allocation headers were removed, reducing memory usage.
10806 * `format!` implements a completely new, extensible, and higher-performance
10807 string formatting system. It will replace `fmt!`.
10808 * `print!` and `println!` write formatted strings (using the `format!`
10809 extension) to stdout.
10810 * `write!` and `writeln!` write formatted strings (using the `format!`
10811 extension) to the new Writers in `std::rt::io`.
10812 * The library section in which a function or static is placed may
10813 be specified with `#[link_section = "..."]`.
10814 * The `proto!` syntax extension for defining bounded message protocols
10816 * `macro_rules!` is hygienic for `let` declarations.
10817 * The `#[export_name]` attribute specifies the name of a symbol.
10818 * `unreachable!` can be used to indicate unreachable code, and fails
10822 * std: Transitioned to the new runtime, written in Rust.
10823 * std: Added an experimental I/O library, `rt::io`, based on the new
10825 * std: A new generic `range` function was added to the prelude, replacing
10826 `uint::range` and friends.
10827 * std: `range_rev` no longer exists. Since range is an iterator it can be
10828 reversed with `range(lo, hi).invert()`.
10829 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10830 renamed to `unwrap_or`.
10831 * std: The `iterator` module was renamed to `iter`.
10832 * std: Integral types now support the `checked_add`, `checked_sub`, and
10833 `checked_mul` operations for detecting overflow.
10834 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10836 * std: Methods are standardizing on conventions for casting methods:
10837 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10839 * std: The `CString` type in `c_str` provides new ways to convert to and
10841 * std: `DoubleEndedIterator` can yield elements in two directions.
10842 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10844 * std: `str::from_bytes` renamed to `str::from_utf8`.
10845 * std: `pop_opt` and `shift_opt` methods added to vectors.
10846 * std: The task-local data interface no longer uses @, and keys are
10847 no longer function pointers.
10848 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10849 * std: Added `SharedPort` to `comm`.
10850 * std: `Eq` has a default method for `ne`; only `eq` is required
10851 in implementations.
10852 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10853 is required in implementations.
10854 * std: `is_utf8` performance is improved, impacting many string functions.
10855 * std: `os::MemoryMap` provides cross-platform mmap.
10856 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10857 are not 'in-bounds' are considered undefined.
10858 * std: Many freestanding functions in `vec` removed in favor of methods.
10859 * std: Many freestanding functions on scalar types removed in favor of
10861 * std: Many options to task builders were removed since they don't make
10862 sense in the new scheduler design.
10863 * std: More containers implement `FromIterator` so can be created by the
10865 * std: More complete atomic types in `unstable::atomics`.
10866 * std: `comm::PortSet` removed.
10867 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10868 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10869 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10870 default implementations.
10871 * std: Various `from_str` functions were removed in favor of a generic
10872 `from_str` which is available in the prelude.
10873 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10874 * extra: `dlist`, the doubly-linked list was modernized.
10875 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10876 * extra: Added `glob` module, replacing `std::os::glob`.
10877 * extra: `rope` was removed.
10878 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10879 * extra: `net`, and `timer` were removed. The experimental replacements
10880 are `std::rt::io::net` and `std::rt::io::timer`.
10881 * extra: Iterators implemented for `SmallIntMap`.
10882 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10883 * extra: `SmallIntSet` removed. Use `BitvSet`.
10884 * extra: Performance of JSON parsing greatly improved.
10885 * extra: `semver` updated to SemVer 2.0.0.
10886 * extra: `term` handles more terminals correctly.
10887 * extra: `dbg` module removed.
10888 * extra: `par` module removed.
10889 * extra: `future` was cleaned up, with some method renames.
10890 * extra: Most free functions in `getopts` were converted to methods.
10893 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10894 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10895 similarly to gcc's `--march` flag.
10896 * rustc's performance compiling small crates is much better.
10897 * rustpkg has received many improvements.
10898 * rustpkg supports git tags as package IDs.
10899 * rustpkg builds into target-specific directories so it can be used for
10901 * The number of concurrent test tasks is controlled by the environment
10902 variable RUST_TEST_TASKS.
10903 * The test harness can now report metrics for benchmarks.
10904 * All tools have man pages.
10905 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10906 * The runtime uses jemalloc for allocations.
10907 * Segmented stacks are temporarily disabled as part of the transition to
10908 the new runtime. Stack overflows are possible!
10909 * A new documentation backend, rustdoc_ng, is available for use. It is
10910 still invoked through the normal `rustdoc` command.
10913 Version 0.7 (2013-07-03)
10914 =======================
10916 * ~2000 changes, numerous bugfixes
10919 * `impl`s no longer accept a visibility qualifier. Put them on methods
10921 * The borrow checker has been rewritten with flow-sensitivity, fixing
10922 many bugs and inconveniences.
10923 * The `self` parameter no longer implicitly means `&'self self`,
10924 and can be explicitly marked with a lifetime.
10925 * Overloadable compound operators (`+=`, etc.) have been temporarily
10926 removed due to bugs.
10927 * The `for` loop protocol now requires `for`-iterators to return `bool`
10928 so they compose better.
10929 * The `Durable` trait is replaced with the `'static` bounds.
10930 * Trait default methods work more often.
10931 * Structs with the `#[packed]` attribute have byte alignment and
10932 no padding between fields.
10933 * Type parameters bound by `Copy` must now be copied explicitly with
10934 the `copy` keyword.
10935 * It is now illegal to move out of a dereferenced unsafe pointer.
10936 * `Option<~T>` is now represented as a nullable pointer.
10937 * `@mut` does dynamic borrow checks correctly.
10938 * The `main` function is only detected at the topmost level of the crate.
10939 The `#[main]` attribute is still valid anywhere.
10940 * Struct fields may no longer be mutable. Use inherited mutability.
10941 * The `#[no_send]` attribute makes a type that would otherwise be
10943 * The `#[no_freeze]` attribute makes a type that would otherwise be
10945 * Unbounded recursion will abort the process after reaching the limit
10946 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10947 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10948 are never implicitly copyable.
10949 * `#[static_assert]` makes compile-time assertions about static bools.
10950 * At long last, 'argument modes' no longer exist.
10951 * The rarely used `use mod` statement no longer exists.
10953 * Syntax extensions
10954 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10956 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10957 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10958 `#[deriving(...)]`.
10959 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10960 and unsuffixed integer literals.
10963 * The `core` crate was renamed to `std`.
10964 * The `std` crate was renamed to `extra`.
10965 * More and improved documentation.
10966 * std: `iterator` module for external iterator objects.
10967 * Many old-style (internal, higher-order function) iterators replaced by
10968 implementations of `Iterator`.
10969 * std: Many old internal vector and string iterators,
10970 incl. `any`, `all`. removed.
10971 * std: The `finalize` method of `Drop` renamed to `drop`.
10972 * std: The `drop` method now takes `&mut self` instead of `&self`.
10973 * std: The prelude no longer re-exports any modules, only types and traits.
10974 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10975 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10976 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10977 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10978 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10979 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10980 * std: Many types implement `Clone`.
10981 * std: `path` type renamed to `Path`.
10982 * std: `mut` module and `Mut` type removed.
10983 * std: Many standalone functions removed in favor of methods and iterators
10984 in `vec`, `str`. In the future methods will also work as functions.
10985 * std: `reinterpret_cast` removed. Use `transmute`.
10986 * std: ascii string handling in `std::ascii`.
10987 * std: `Rand` is implemented for ~/@.
10988 * std: `run` module for spawning processes overhauled.
10989 * std: Various atomic types added to `unstable::atomic`.
10990 * std: Various types implement `Zero`.
10991 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10992 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10993 * std: Added `os::mkdir_recursive`.
10994 * std: Added `os::glob` function performs filesystems globs.
10995 * std: `FuzzyEq` renamed to `ApproxEq`.
10996 * std: `Map` now defines `pop` and `swap` methods.
10997 * std: `Cell` constructors converted to static methods.
10998 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10999 * extra: `flate` module moved from `std` to `extra`.
11000 * extra: `fileinput` module for iterating over a series of files.
11001 * extra: `Complex` number type and `complex` module.
11002 * extra: `Rational` number type and `rational` module.
11003 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11004 * extra: `term` uses terminfo now, is more correct.
11005 * extra: `arc` functions converted to methods.
11006 * extra: Implementation of fixed output size variations of SHA-2.
11009 * `unused_variables` lint mode for unused variables (default: warn).
11010 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11012 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11014 * `dead_assignment` lint mode for unread variables (default: warn).
11015 * `unnecessary_allocation` lint mode detects some heap allocations that are
11016 immediately borrowed so could be written without allocating (default: warn).
11017 * `missing_doc` lint mode (default: allow).
11018 * `unreachable_code` lint mode (default: warn).
11019 * The `rusti` command has been rewritten and a number of bugs addressed.
11020 * rustc outputs in color on more terminals.
11021 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11022 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11023 * Compiling with `-g` will make the binary record information about
11024 dynamic borrowcheck failures for debugging.
11025 * rustdoc has a nicer stylesheet.
11026 * Various improvements to rustdoc.
11027 * Improvements to rustpkg (see the detailed release notes).
11030 Version 0.6 (2013-04-03)
11031 ========================
11033 * ~2100 changes, numerous bugfixes
11036 * The self type parameter in traits is now spelled `Self`
11037 * The `self` parameter in trait and impl methods must now be explicitly
11038 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11039 * Static methods no longer require the `static` keyword and instead
11040 are distinguished by the lack of a `self` parameter
11041 * Replaced the `Durable` trait with the `'static` lifetime
11042 * The old closure type syntax with the trailing sigil has been
11043 removed in favor of the more consistent leading sigil
11044 * `super` is a keyword, and may be prefixed to paths
11045 * Trait bounds are separated with `+` instead of whitespace
11046 * Traits are implemented with `impl Trait for Type`
11047 instead of `impl Type: Trait`
11048 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11049 * The `export` keyword has finally been removed
11050 * The `move` keyword has been removed (see "Semantic changes")
11051 * The interior mutability qualifier on vectors, `[mut T]`, has been
11052 removed. Use `&mut [T]`, etc.
11053 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11054 * `fail` is no longer a keyword. Use `fail!()`
11055 * `assert` is no longer a keyword. Use `assert!()`
11056 * `log` is no longer a keyword. use `debug!`, etc.
11057 * 1-tuples may be represented as `(T,)`
11058 * Struct fields may no longer be `mut`. Use inherited mutability,
11059 `@mut T`, `core::mut` or `core::cell`
11060 * `extern mod { ... }` is no longer valid syntax for foreign
11061 function modules. Use extern blocks: `extern { ... }`
11062 * Newtype enums removed. Use tuple-structs.
11063 * Trait implementations no longer support visibility modifiers
11064 * Pattern matching over vectors improved and expanded
11065 * `const` renamed to `static` to correspond to lifetime name,
11066 and make room for future `static mut` unsafe mutable globals.
11067 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11068 * `Clone` implementations can be automatically generated with
11069 `#[deriving(Clone)]`
11070 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11071 instead of `foo as Bar`.
11072 * Fixed length vector types are now written as `[int, .. 3]`
11073 instead of `[int * 3]`.
11074 * Fixed length vector types can express the length as a constant
11075 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11078 * Types with owned pointers or custom destructors move by default,
11079 eliminating the `move` keyword
11080 * All foreign functions are considered unsafe
11081 * &mut is now unaliasable
11082 * Writes to borrowed @mut pointers are prevented dynamically
11084 * The name of the main function can be customized using #[main]
11085 * The default type of an inferred closure is &fn instead of @fn
11086 * `use` statements may no longer be "chained" - they cannot import
11087 identifiers imported by previous `use` statements
11088 * `use` statements are crate relative, importing from the "top"
11089 of the crate by default. Paths may be prefixed with `super::`
11090 or `self::` to change the search behavior.
11091 * Method visibility is inherited from the implementation declaration
11092 * Structural records have been removed
11093 * Many more types can be used in static items, including enums
11094 'static-lifetime pointers and vectors
11095 * Pattern matching over vectors improved and expanded
11096 * Typechecking of closure types has been overhauled to
11097 improve inference and eliminate unsoundness
11098 * Macros leave scope at the end of modules, unless that module is
11099 tagged with #[macro_escape]
11102 * Added big integers to `std::bigint`
11103 * Removed `core::oldcomm` module
11104 * Added pipe-based `core::comm` module
11105 * Numeric traits have been reorganized under `core::num`
11106 * `vec::slice` finally returns a slice
11107 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11108 * Containers reorganized around traits in `core::container`
11109 * `core::dvec` removed, `~[T]` is a drop-in replacement
11110 * `core::send_map` renamed to `core::hashmap`
11111 * `std::map` removed; replaced with `core::hashmap`
11112 * `std::treemap` reimplemented as an owned balanced tree
11113 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11114 * `core::trie` added as a fast ordered map for integer keys
11115 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11116 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11117 overload the comparison operators, whereas `TotalOrd` is used
11118 by certain container types
11121 * Replaced the 'cargo' package manager with 'rustpkg'
11122 * Added all-purpose 'rust' tool
11123 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11124 * rustc now *attempts* to offer spelling suggestions
11125 * Improved support for ARM and Android
11126 * Preliminary MIPS backend
11127 * Improved foreign function ABI implementation for x86, x86_64
11128 * Various memory usage improvements
11129 * Rust code may be embedded in foreign code under limited circumstances
11130 * Inline assembler supported by new asm!() syntax extension.
11133 Version 0.5 (2012-12-21)
11134 ===========================
11136 * ~900 changes, numerous bugfixes
11139 * Removed `<-` move operator
11140 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11141 * Removed old fixed length vector syntax - `[T]/N`
11142 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11143 * Macros may now expand to items and statements
11144 * `a.b()` is always parsed as a method call, never as a field projection
11145 * `Eq` and `IterBytes` implementations can be automatically generated
11146 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11147 * Removed the special crate language for `.rc` files
11148 * Function arguments may consist of any irrefutable pattern
11151 * `&` and `~` pointers may point to objects
11152 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11153 * Enum variants may be structs
11154 * Destructors can be added to all nominal types with the Drop trait
11155 * Structs and nullary enum variants may be constants
11156 * Values that cannot be implicitly copied are now automatically moved
11157 without writing `move` explicitly
11158 * `&T` may now be coerced to `*T`
11159 * Coercions happen in `let` statements as well as function calls
11160 * `use` statements now take crate-relative paths
11161 * The module and type namespaces have been merged so that static
11162 method names can be resolved under the trait in which they are
11165 * Improved support for language features
11166 * Trait inheritance works in many scenarios
11167 * More support for explicit self arguments in methods - `self`, `&self`
11168 `@self`, and `~self` all generally work as expected
11169 * Static methods work in more situations
11170 * Experimental: Traits may declare default methods for the implementations
11174 * New condition handling system in `core::condition`
11175 * Timsort added to `std::sort`
11176 * New priority queue, `std::priority_queue`
11177 * Pipes for serializable types, `std::flatpipes'
11178 * Serialization overhauled to be trait-based
11179 * Expanded `getopts` definitions
11180 * Moved futures to `std`
11181 * More functions are pure now
11182 * `core::comm` renamed to `oldcomm`. Still deprecated
11183 * `rustdoc` and `cargo` are libraries now
11186 * Added a preliminary REPL, `rusti`
11187 * License changed from MIT to dual MIT/APL2
11190 Version 0.4 (2012-10-15)
11191 ==========================
11193 * ~2000 changes, numerous bugfixes
11196 * All keywords are now strict and may not be used as identifiers anywhere
11197 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11198 'of', 'with', 'to', 'class'.
11199 * Classes are replaced with simpler structs
11200 * Explicit method self types
11201 * `ret` became `return` and `alt` became `match`
11202 * `import` is now `use`; `use is now `extern mod`
11203 * `extern mod { ... }` is now `extern { ... }`
11204 * `use mod` is the recommended way to import modules
11205 * `pub` and `priv` replace deprecated export lists
11206 * The syntax of `match` pattern arms now uses fat arrow (=>)
11207 * `main` no longer accepts an args vector; use `os::args` instead
11210 * Trait implementations are now coherent, ala Haskell typeclasses
11211 * Trait methods may be static
11212 * Argument modes are deprecated
11213 * Borrowed pointers are much more mature and recommended for use
11214 * Strings and vectors in the static region are stored in constant memory
11215 * Typestate was removed
11216 * Resolution rewritten to be more reliable
11217 * Support for 'dual-mode' data structures (freezing and thawing)
11220 * Most binary operators can now be overloaded via the traits in
11222 * `std::net::url` for representing URLs
11223 * Sendable hash maps in `core::send_map`
11224 * `core::task' gained a (currently unsafe) task-local storage API
11227 * An efficient new intertask communication primitive called the pipe,
11228 along with a number of higher-level channel types, in `core::pipes`
11229 * `std::arc`, an atomically reference counted, immutable, shared memory
11231 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11232 * Futures are now based on pipes and sendable
11233 * More robust linked task failure
11234 * Improved task builder API
11237 * Improved error reporting
11238 * Preliminary JIT support
11239 * Preliminary work on precise GC
11240 * Extensive architectural improvements to rustc
11241 * Begun a transition away from buggy C++-based reflection (shape) code to
11242 Rust-based (visitor) code
11243 * All hash functions and tables converted to secure, randomized SipHash
11246 Version 0.3 (2012-07-12)
11247 ========================
11249 * ~1900 changes, numerous bugfixes
11251 * New coding conveniences
11252 * Integer-literal suffix inference
11253 * Per-item control over warnings, errors
11254 * #[cfg(windows)] and #[cfg(unix)] attributes
11255 * Documentation comments
11256 * More compact closure syntax
11257 * 'do' expressions for treating higher-order functions as
11259 * *-patterns (wildcard extended to all constructor fields)
11262 * Name resolution pass and exhaustiveness checker rewritten
11263 * Region pointers and borrow checking supersede alias
11265 * Init-ness checking is now provided by a region-based liveness
11266 pass instead of the typestate pass; same for last-use analysis
11267 * Extensive work on region pointers
11269 * Experimental new language features
11270 * Slices and fixed-size, interior-allocated vectors
11271 * #!-comments for lang versioning, shell execution
11272 * Destructors and iface implementation for classes;
11273 type-parameterized classes and class methods
11274 * 'const' type kind for types that can be used to implement
11275 shared-memory concurrency patterns
11279 * Removal of various obsolete features
11280 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11281 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11283 * Constructs: do-while loops ('do' repurposed), fn binding,
11284 resources (replaced by destructors)
11286 * Compiler reorganization
11287 * Syntax-layer of compiler split into separate crate
11288 * Clang (from LLVM project) integrated into build
11289 * Typechecker split into sub-modules
11292 * New time functions
11293 * Extension methods for many built-in types
11294 * Arc: atomic-refcount read-only / exclusive-use shared cells
11295 * Par: parallel map and search routines
11296 * Extensive work on libuv interface
11297 * Much vector code moved to libraries
11298 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11299 #include, #include_str, #include_bin
11301 * Tool improvements
11302 * Cargo automatically resolves dependencies
11305 Version 0.2 (2012-03-29)
11306 =========================
11308 * >1500 changes, numerous bugfixes
11310 * New docs and doc tooling
11312 * New port: FreeBSD x86_64
11314 * Compilation model enhancements
11315 * Generics now specialized, multiply instantiated
11316 * Functions now inlined across separate crates
11318 * Scheduling, stack and threading fixes
11319 * Noticeably improved message-passing performance
11320 * Explicit schedulers
11324 * Experimental new language features
11325 * Operator overloading
11329 * Various language extensions
11330 * C-callback function types: 'crust fn ...'
11331 * Infinite-loop construct: 'loop { ... }'
11332 * Shorten 'mutable' to 'mut'
11333 * Required mutable-local qualifier: 'let mut ...'
11334 * Basic glob-exporting: 'export foo::*;'
11335 * Alt now exhaustive, 'alt check' for runtime-checked
11336 * Block-function form of 'for' loop, with 'break' and 'ret'.
11339 * AST quasi-quote syntax extension
11340 * Revived libuv interface
11341 * New modules: core::{future, iter}, std::arena
11342 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11343 * Extensive cleanup, regularization in libstd, libcore
11346 Version 0.1 (2012-01-20)
11347 ===============================
11349 * Most language features work, including:
11350 * Unique pointers, unique closures, move semantics
11351 * Interface-constrained generics
11352 * Static interface dispatch
11354 * Multithread task scheduling
11355 * Typestate predicates
11356 * Failure unwinding, destructors
11357 * Pattern matching and destructuring assignment
11358 * Lightweight block-lambda syntax
11359 * Preliminary macro-by-example
11361 * Compiler works with the following configurations:
11362 * Linux: x86 and x86_64 hosts and targets
11363 * macOS: x86 and x86_64 hosts and targets
11364 * Windows: x86 hosts and targets
11366 * Cross compilation / multi-target configuration supported.
11368 * Preliminary API-documentation and package-management tools included.
11372 * Documentation is incomplete.
11374 * Performance is below intended target.
11376 * Standard library APIs are subject to extensive change, reorganization.
11378 * Language-level versioning is not yet operational - future code will
11379 break unexpectedly.