1 Version 1.16.0 (2017-03-16)
2 ===========================
7 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
8 * [Uninhabitable enums (those without any variants) no longer permit wildcard
10 * [Clean up semantics of `self` in an import list][38313]
11 * [`Self` may appear in `impl` headers][38920]
12 * [`Self` may appear in struct expressions][39282]
17 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
18 a `.rmeta` file containing only crate metadata][38571]. This can be
19 used by tools like the Rust Language Service to perform
21 * [Levenshtein based typo suggestions now work in most places, while
22 previously they worked only for fields and sometimes for local
23 variables][38927]. Together with the overhaul of "no
24 resolution"/"unexpected resolution" errors (#[38154]) they result in
25 large and systematic improvement in resolution diagnostics.
26 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
28 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
29 * [`rustc` no longer attempts to provide "consider using an explicit
30 lifetime" suggestions][37057]. They were inaccurate.
35 * [`VecDeque::truncate`]
36 * [`VecDeque::resize`]
37 * [`String::insert_str`]
38 * [`Duration::checked_add`]
39 * [`Duration::checked_sub`]
40 * [`Duration::checked_div`]
41 * [`Duration::checked_mul`]
44 * [`SocketAddr::is_ipv4`]
45 * [`SocketAddr::is_ipv6`]
49 * [`Vec::dedup_by_key`]
50 * [`Result::unwrap_or_default`]
51 * [`<*const T>::wrapping_offset`]
52 * [`<*mut T>::wrapping_offset`]
53 * `CommandExt::creation_flags`
54 * [`File::set_permissions`]
55 * [`String::split_off`]
60 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
61 their argument by `Borrow` parameter][37761]
62 * [All public types in std implement `Debug`][38006]
63 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
64 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
65 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
67 * [std: Fix partial writes in `LineWriter`][38062]
68 * [std: Clamp max read/write sizes on Unix][38062]
69 * [Use more specific panic message for `&str` slicing errors][38066]
70 * [`TcpListener::set_only_v6` is deprecated][38304]. This
71 functionality cannot be achieved in std currently.
72 * [`writeln!`, like `println!`, now accepts a form with no string
73 or formatting arguments, to just print a newline][38469]
74 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
75 * [Reduce the size of static data in `std_unicode::tables`][38781]
76 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
77 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
79 * [`Duration` implements `Sum`][38712]
80 * [`String` implements `ToSocketAddrs`][39048]
85 * [The `cargo check` command does a type check of a project without
86 building it][cargo/3296]
87 * [crates.io will display CI badges from Travis and AppVeyor, if
88 specified in Cargo.toml][cargo/3546]
89 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
90 * [Compilation profiles accept integer values for `debug`, in addition
91 to `true` and `false`. These are passed to `rustc` as the value to
92 `-C debuginfo`][cargo/3534]
93 * [Implement `cargo --version --verbose`][cargo/3604]
94 * [All builds now output 'dep-info' build dependencies compatible with
95 make and ninja][cargo/3557]
96 * [Build all workspace members with `build --all`][cargo/3511]
97 * [Document all workspace members with `doc --all`][cargo/3515]
98 * [Path deps outside workspace are not members][cargo/3443]
103 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
104 the path to the Rust implementation][38589]
105 * [The `armv7-linux-androideabi` target no longer enables NEON
106 extensions, per Google's ABI guide][38413]
107 * [The stock standard library can be compiled for Redox OS][38401]
108 * [Rust has initial SPARC support][38726]. Tier 3. No builds
110 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
112 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
117 * [Uninhabitable enums (those without any variants) no longer permit wildcard
118 match patterns][38069]
119 * In this release, references to uninhabited types can not be
120 pattern-matched. This was accidentally allowed in 1.15.
121 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
122 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
124 * [Clean up semantics of `self` in an import list][38313]
126 [37057]: https://github.com/rust-lang/rust/pull/37057
127 [37761]: https://github.com/rust-lang/rust/pull/37761
128 [38006]: https://github.com/rust-lang/rust/pull/38006
129 [38051]: https://github.com/rust-lang/rust/pull/38051
130 [38062]: https://github.com/rust-lang/rust/pull/38062
131 [38062]: https://github.com/rust-lang/rust/pull/38622
132 [38066]: https://github.com/rust-lang/rust/pull/38066
133 [38069]: https://github.com/rust-lang/rust/pull/38069
134 [38131]: https://github.com/rust-lang/rust/pull/38131
135 [38154]: https://github.com/rust-lang/rust/pull/38154
136 [38274]: https://github.com/rust-lang/rust/pull/38274
137 [38304]: https://github.com/rust-lang/rust/pull/38304
138 [38313]: https://github.com/rust-lang/rust/pull/38313
139 [38314]: https://github.com/rust-lang/rust/pull/38314
140 [38327]: https://github.com/rust-lang/rust/pull/38327
141 [38401]: https://github.com/rust-lang/rust/pull/38401
142 [38413]: https://github.com/rust-lang/rust/pull/38413
143 [38469]: https://github.com/rust-lang/rust/pull/38469
144 [38559]: https://github.com/rust-lang/rust/pull/38559
145 [38571]: https://github.com/rust-lang/rust/pull/38571
146 [38580]: https://github.com/rust-lang/rust/pull/38580
147 [38589]: https://github.com/rust-lang/rust/pull/38589
148 [38670]: https://github.com/rust-lang/rust/pull/38670
149 [38712]: https://github.com/rust-lang/rust/pull/38712
150 [38726]: https://github.com/rust-lang/rust/pull/38726
151 [38781]: https://github.com/rust-lang/rust/pull/38781
152 [38798]: https://github.com/rust-lang/rust/pull/38798
153 [38909]: https://github.com/rust-lang/rust/pull/38909
154 [38920]: https://github.com/rust-lang/rust/pull/38920
155 [38927]: https://github.com/rust-lang/rust/pull/38927
156 [39048]: https://github.com/rust-lang/rust/pull/39048
157 [39282]: https://github.com/rust-lang/rust/pull/39282
158 [39379]: https://github.com/rust-lang/rust/pull/39379
159 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
160 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
161 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
162 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
163 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
164 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
165 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
166 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
167 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
168 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
169 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
170 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
171 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
172 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
173 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
174 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
175 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
176 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
177 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
178 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
179 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
180 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
181 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
182 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
183 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
184 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
185 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
186 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
187 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
188 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
191 Version 1.15.1 (2017-02-09)
192 ===========================
194 * [Fix IntoIter::as_mut_slice's signature][39466]
195 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
197 [39466]: https://github.com/rust-lang/rust/pull/39466
198 [39523]: https://github.com/rust-lang/rust/pull/39523
201 Version 1.15.0 (2017-02-02)
202 ===========================
207 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
208 stable. This allows popular code-generating crates like Serde and Diesel to
209 work ergonomically. [RFC 1681].
210 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
211 with curly braces][36868]. Part of [RFC 1506].
212 * [A number of minor changes to name resolution have been activated][37127].
213 They add up to more consistent semantics, allowing for future evolution of
214 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
215 details of what is different. The breaking changes here have been transitioned
216 through the [`legacy_imports`] lint since 1.14, with no known regressions.
217 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
219 * [`?Sized` can be used in `where` clauses][37791]
220 * [There is now a limit on the size of monomorphized types and it can be
221 modified with the `#![type_size_limit]` crate attribute, similarly to
222 the `#![recursion_limit]` attribute][37789]
227 * [On Windows, the compiler will apply dllimport attributes when linking to
228 extern functions][37973]. Additional attributes and flags can control which
229 library kind is linked and its name. [RFC 1717].
230 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
231 * [The `--test` flag works with procedural macro crates][38107]
232 * [Fix `extern "aapcs" fn` ABI][37814]
233 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
234 * [The `format!` expander recognizes incorrect `printf` and shell-style
235 formatting directives and suggests the correct format][37613].
236 * [Only report one error for all unused imports in an import list][37456]
241 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
242 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
243 * [Don't clone in `UnificationTable::probe`][37848]
244 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
245 * [Use small vectors in type walker][37760]
246 * [Macro expansion performance was improved][37701]
247 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
248 * [Replace FNV with a faster hash function][37229]
253 * [`std::iter::Iterator::min_by`]
254 * [`std::iter::Iterator::max_by`]
255 * [`std::os::*::fs::FileExt`]
256 * [`std::sync::atomic::Atomic*::get_mut`]
257 * [`std::sync::atomic::Atomic*::into_inner`]
258 * [`std::vec::IntoIter::as_slice`]
259 * [`std::vec::IntoIter::as_mut_slice`]
260 * [`std::sync::mpsc::Receiver::try_iter`]
261 * [`std::os::unix::process::CommandExt::before_exec`]
262 * [`std::rc::Rc::strong_count`]
263 * [`std::rc::Rc::weak_count`]
264 * [`std::sync::Arc::strong_count`]
265 * [`std::sync::Arc::weak_count`]
266 * [`std::char::encode_utf8`]
267 * [`std::char::encode_utf16`]
268 * [`std::cell::Ref::clone`]
269 * [`std::io::Take::into_inner`]
274 * [The standard sorting algorithm has been rewritten for dramatic performance
275 improvements][38192]. It is a hybrid merge sort, drawing influences from
276 Timsort. Previously it was a naive merge sort.
277 * [`Iterator::nth` no longer has a `Sized` bound][38134]
278 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
280 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
281 and `char_indices().last()`][37882]
282 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
283 * [Chinese characters display correctly in `fmt::Debug`][37855]
284 * [Derive `Default` for `Duration`][37699]
285 * [Support creation of anonymous pipes on WinXP/2k][37677]
286 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
287 * [Don't pass overlapped handles to processes][38835]
292 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
293 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
294 should instead check the variable at runtime with `std::env`. That the value
295 was set at build time was a bug, and incorrect when cross-compiling. This
296 change is known to cause breakage.
297 * [Add `--all` flag to `cargo test`][cargo/3221]
298 * [Compile statically against the MSVC CRT][cargo/3363]
299 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
300 * [Link OpenSSL statically on OSX][cargo/3311]
301 * [Apply new fingerprinting to build dir outputs][cargo/3310]
302 * [Test for bad path overrides with summaries][cargo/3336]
303 * [Require `cargo install --vers` to take a semver version][cargo/3338]
304 * [Fix retrying crate downloads for network errors][cargo/3348]
305 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
306 * [Emit more info on --message-format=json][cargo/3319]
307 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
308 * [Don't ignore errors in workspace manifest][cargo/3409]
309 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
314 * [Test runners (binaries built with `--test`) now support a `--list` argument
315 that lists the tests it contains][38185]
316 * [Test runners now support a `--exact` argument that makes the test filter
317 match exactly, instead of matching only a substring of the test name][38181]
318 * [rustdoc supports a `--playground-url` flag][37763]
319 * [rustdoc provides more details about `#[should_panic]` errors][37749]
324 * [The Rust build system is now written in Rust][37817]. The Makefiles may
325 continue to be used in this release by passing `--disable-rustbuild` to the
326 configure script, but they will be deleted soon. Note that the new build
327 system uses a different on-disk layout that will likely affect any scripts
329 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
331 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
332 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
338 * [A number of minor changes to name resolution have been activated][37127].
339 They add up to more consistent semantics, allowing for future evolution of
340 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
341 details of what is different. The breaking changes here have been transitioned
342 through the [`legacy_imports`] lint since 1.14, with no known regressions.
343 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
344 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
345 should instead check the variable at runtime with `std::env`. That the value
346 was set at build time was a bug, and incorrect when cross-compiling. This
347 change is known to cause breakage.
348 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
349 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
350 1.10 and is now an error by default. It will become a hard error in the near
352 * [The semantics relating modules to file system directories are changing in
353 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
354 lint, which is a warning in this release, and will become a hard error in the
356 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
357 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
358 the underlying iterator][37834]
360 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
361 [33685]: https://github.com/rust-lang/rust/issues/33685
362 [36868]: https://github.com/rust-lang/rust/pull/36868
363 [37127]: https://github.com/rust-lang/rust/pull/37127
364 [37229]: https://github.com/rust-lang/rust/pull/37229
365 [37456]: https://github.com/rust-lang/rust/pull/37456
366 [37527]: https://github.com/rust-lang/rust/pull/37527
367 [37602]: https://github.com/rust-lang/rust/pull/37602
368 [37613]: https://github.com/rust-lang/rust/pull/37613
369 [37615]: https://github.com/rust-lang/rust/pull/37615
370 [37636]: https://github.com/rust-lang/rust/pull/37636
371 [37627]: https://github.com/rust-lang/rust/pull/37627
372 [37642]: https://github.com/rust-lang/rust/pull/37642
373 [37677]: https://github.com/rust-lang/rust/pull/37677
374 [37699]: https://github.com/rust-lang/rust/pull/37699
375 [37701]: https://github.com/rust-lang/rust/pull/37701
376 [37705]: https://github.com/rust-lang/rust/pull/37705
377 [37749]: https://github.com/rust-lang/rust/pull/37749
378 [37760]: https://github.com/rust-lang/rust/pull/37760
379 [37763]: https://github.com/rust-lang/rust/pull/37763
380 [37764]: https://github.com/rust-lang/rust/pull/37764
381 [37789]: https://github.com/rust-lang/rust/pull/37789
382 [37791]: https://github.com/rust-lang/rust/pull/37791
383 [37814]: https://github.com/rust-lang/rust/pull/37814
384 [37817]: https://github.com/rust-lang/rust/pull/37817
385 [37834]: https://github.com/rust-lang/rust/pull/37834
386 [37848]: https://github.com/rust-lang/rust/pull/37848
387 [37855]: https://github.com/rust-lang/rust/pull/37855
388 [37882]: https://github.com/rust-lang/rust/pull/37882
389 [37888]: https://github.com/rust-lang/rust/pull/37888
390 [37973]: https://github.com/rust-lang/rust/pull/37973
391 [37979]: https://github.com/rust-lang/rust/pull/37979
392 [38086]: https://github.com/rust-lang/rust/pull/38086
393 [38107]: https://github.com/rust-lang/rust/pull/38107
394 [38117]: https://github.com/rust-lang/rust/pull/38117
395 [38134]: https://github.com/rust-lang/rust/pull/38134
396 [38146]: https://github.com/rust-lang/rust/pull/38146
397 [38181]: https://github.com/rust-lang/rust/pull/38181
398 [38182]: https://github.com/rust-lang/rust/pull/38182
399 [38185]: https://github.com/rust-lang/rust/pull/38185
400 [38192]: https://github.com/rust-lang/rust/pull/38192
401 [38279]: https://github.com/rust-lang/rust/pull/38279
402 [38835]: https://github.com/rust-lang/rust/pull/38835
403 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
404 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
405 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
406 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
407 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
408 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
409 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
410 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
411 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
412 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
413 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
414 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
415 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
416 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
417 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
418 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
419 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
420 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
421 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
422 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
423 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
424 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
425 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
426 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
427 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
428 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
429 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
430 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
431 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
432 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
433 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
434 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
435 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
436 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
437 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
438 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
439 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
440 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
443 Version 1.14.0 (2016-12-22)
444 ===========================
449 * [`..` matches multiple tuple fields in enum variants, structs
450 and tuples][36843]. [RFC 1492].
451 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
452 * [`use *` and `use ::*` both glob-import from the crate root][37367]
453 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
454 dereferencing][36822]
459 * [Mark enums with non-zero discriminant as non-zero][37224]
460 * [Lower-case `static mut` names are linted like other
461 statics and consts][37162]
462 * [Fix ICE on some macros in const integer positions
463 (e.g. `[u8; m!()]`)][36819]
464 * [Improve error message and snippet for "did you mean `x`"][36798]
465 * [Add a panic-strategy field to the target specification][36794]
466 * [Include LLVM version in `--version --verbose`][37200]
468 Compile-time Optimizations
469 --------------------------
471 * [Improve macro expansion performance][37569]
472 * [Shrink `Expr_::ExprInlineAsm`][37445]
473 * [Replace all uses of SHA-256 with BLAKE2b][37439]
474 * [Reduce the number of bytes hashed by `IchHasher`][37427]
475 * [Avoid more allocations when compiling html5ever][37373]
476 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
477 * [Avoid some allocations in the macro parser][37318]
478 * [Use a faster deflate setting][37298]
479 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
480 during interning of slices][37270]
481 * [Optimize `write_metadata`][37267]
482 * [Don't process obligation forest cycles when stalled][37231]
483 * [Avoid many `CrateConfig` clones][37161]
484 * [Optimize `Substs::super_fold_with`][37108]
485 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
486 * [Speed up `plug_leaks`][36917]
491 * [`println!()`, with no arguments, prints newline][36825].
492 Previously, an empty string was required to achieve the same.
493 * [`Wrapping` impls standard binary and unary operators, as well as
494 the `Sum` and `Product` iterators][37356]
495 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
497 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
498 `VecDeque` iterators][37315]
499 * [Improve `SipHasher` performance on small values][37312]
500 * [Add Iterator trait TrustedLen to enable better FromIterator /
502 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
503 * [`ReadDir` implements `Debug`][37221]
504 * [Implement `RefUnwindSafe` for atomic types][37178]
505 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
506 * [Avoid allocations in `Decoder::read_str`][37064]
507 * [`io::Error` implements `From<io::ErrorKind>`][37037]
508 * [Impl `Debug` for raw pointers to unsized data][36880]
509 * [Don't reuse `HashMap` random seeds][37470]
510 * [The internal memory layout of `HashMap` is more cache-friendly, for
511 significant improvements in some operations][36692]
512 * [`HashMap` uses less memory on 32-bit architectures][36595]
513 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
518 * [Expose rustc cfg values to build scripts][cargo/3243]
519 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
520 * [Fix passing --features when testing multiple packages][cargo/3280]
521 * [Use a single profile set per workspace][cargo/3249]
522 * [Load `replace` sections from lock files][cargo/3220]
523 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
528 * [rustup is the recommended Rust installation method][1.14rustup]
529 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
530 S390x. These are [tier 2] platforms and may have major defects. Follow the
531 instructions on the website to install, or add the targets to an existing
532 installation with `rustup target add`. The new target triples are:
533 - `mips-unknown-linux-gnu`
534 - `mipsel-unknown-linux-gnu`
535 - `mips64-unknown-linux-gnuabi64`
536 - `mips64el-unknown-linux-gnuabi64 `
537 - `powerpc-unknown-linux-gnu`
538 - `powerpc64-unknown-linux-gnu`
539 - `powerpc64le-unknown-linux-gnu`
540 - `s390x-unknown-linux-gnu `
541 * This release includes target (std) builds for ARM Linux running MUSL
542 libc. These are [tier 2] platforms and may have major defects. Add the
543 following triples to an existing rustup installation with `rustup target add`:
544 - `arm-unknown-linux-musleabi`
545 - `arm-unknown-linux-musleabihf`
546 - `armv7-unknown-linux-musleabihf`
547 * This release includes [experimental support for WebAssembly][1.14wasm], via
548 the `wasm32-unknown-emscripten` target. This target is known to have major
549 defects. Please test, report, and fix.
550 * rustup no longer installs documentation by default. Run `rustup
551 component add rust-docs` to install.
552 * [Fix line stepping in debugger][37310]
553 * [Enable line number debuginfo in releases][37280]
558 * [Disable jemalloc on aarch64/powerpc/mips][37392]
559 * [Add support for Fuchsia OS][37313]
560 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
565 * [A number of forward-compatibility lints used by the compiler
566 to gradually introduce language changes have been converted
567 to deny by default][36894]:
568 - ["use of inaccessible extern crate erroneously allowed"][36886]
569 - ["type parameter default erroneously allowed in invalid location"][36887]
570 - ["detects super or self keywords at the beginning of global path"][36888]
571 - ["two overlapping inherent impls define an item with the same name
572 were erroneously allowed"][36889]
573 - ["floating-point constants cannot be used in patterns"][36890]
574 - ["constants of struct or enum type can only be used in a pattern if
575 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
576 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
577 * [Prohibit patterns in trait methods without bodies][37378]
578 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
579 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
580 * [The `$crate` macro variable is accepted in fewer locations][37213]
581 * [Impls specifying extra region requirements beyond the trait
582 they implement are rejected][37167]
583 * [Enums may not be unsized][37111]. Unsized enums are intended to
584 work but never have. For now they are forbidden.
585 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
587 [tier 2]: https://forge.rust-lang.org/platform-support.html
588 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
589 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
590 [36430]: https://github.com/rust-lang/rust/pull/36430
591 [36595]: https://github.com/rust-lang/rust/pull/36595
592 [36595]: https://github.com/rust-lang/rust/pull/36595
593 [36692]: https://github.com/rust-lang/rust/pull/36692
594 [36767]: https://github.com/rust-lang/rust/pull/36767
595 [36794]: https://github.com/rust-lang/rust/pull/36794
596 [36798]: https://github.com/rust-lang/rust/pull/36798
597 [36819]: https://github.com/rust-lang/rust/pull/36819
598 [36822]: https://github.com/rust-lang/rust/pull/36822
599 [36825]: https://github.com/rust-lang/rust/pull/36825
600 [36843]: https://github.com/rust-lang/rust/pull/36843
601 [36880]: https://github.com/rust-lang/rust/pull/36880
602 [36886]: https://github.com/rust-lang/rust/issues/36886
603 [36887]: https://github.com/rust-lang/rust/issues/36887
604 [36888]: https://github.com/rust-lang/rust/issues/36888
605 [36889]: https://github.com/rust-lang/rust/issues/36889
606 [36890]: https://github.com/rust-lang/rust/issues/36890
607 [36891]: https://github.com/rust-lang/rust/issues/36891
608 [36892]: https://github.com/rust-lang/rust/issues/36892
609 [36894]: https://github.com/rust-lang/rust/pull/36894
610 [36917]: https://github.com/rust-lang/rust/pull/36917
611 [36993]: https://github.com/rust-lang/rust/pull/36993
612 [37037]: https://github.com/rust-lang/rust/pull/37037
613 [37064]: https://github.com/rust-lang/rust/pull/37064
614 [37094]: https://github.com/rust-lang/rust/pull/37094
615 [37108]: https://github.com/rust-lang/rust/pull/37108
616 [37111]: https://github.com/rust-lang/rust/pull/37111
617 [37161]: https://github.com/rust-lang/rust/pull/37161
618 [37162]: https://github.com/rust-lang/rust/pull/37162
619 [37167]: https://github.com/rust-lang/rust/pull/37167
620 [37178]: https://github.com/rust-lang/rust/pull/37178
621 [37200]: https://github.com/rust-lang/rust/pull/37200
622 [37213]: https://github.com/rust-lang/rust/pull/37213
623 [37221]: https://github.com/rust-lang/rust/pull/37221
624 [37224]: https://github.com/rust-lang/rust/pull/37224
625 [37230]: https://github.com/rust-lang/rust/pull/37230
626 [37231]: https://github.com/rust-lang/rust/pull/37231
627 [37247]: https://github.com/rust-lang/rust/pull/37247
628 [37267]: https://github.com/rust-lang/rust/pull/37267
629 [37270]: https://github.com/rust-lang/rust/pull/37270
630 [37273]: https://github.com/rust-lang/rust/pull/37273
631 [37280]: https://github.com/rust-lang/rust/pull/37280
632 [37298]: https://github.com/rust-lang/rust/pull/37298
633 [37306]: https://github.com/rust-lang/rust/pull/37306
634 [37310]: https://github.com/rust-lang/rust/pull/37310
635 [37312]: https://github.com/rust-lang/rust/pull/37312
636 [37313]: https://github.com/rust-lang/rust/pull/37313
637 [37315]: https://github.com/rust-lang/rust/pull/37315
638 [37318]: https://github.com/rust-lang/rust/pull/37318
639 [37322]: https://github.com/rust-lang/rust/pull/37322
640 [37326]: https://github.com/rust-lang/rust/pull/37326
641 [37351]: https://github.com/rust-lang/rust/pull/37351
642 [37356]: https://github.com/rust-lang/rust/pull/37356
643 [37367]: https://github.com/rust-lang/rust/pull/37367
644 [37373]: https://github.com/rust-lang/rust/pull/37373
645 [37378]: https://github.com/rust-lang/rust/pull/37378
646 [37389]: https://github.com/rust-lang/rust/pull/37389
647 [37392]: https://github.com/rust-lang/rust/pull/37392
648 [37427]: https://github.com/rust-lang/rust/pull/37427
649 [37439]: https://github.com/rust-lang/rust/pull/37439
650 [37445]: https://github.com/rust-lang/rust/pull/37445
651 [37470]: https://github.com/rust-lang/rust/pull/37470
652 [37569]: https://github.com/rust-lang/rust/pull/37569
653 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
654 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
655 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
656 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
657 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
658 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
659 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
662 Version 1.13.0 (2016-11-10)
663 ===========================
668 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
669 errors, like the `try!` macro, described in [RFC 0243].
670 * [Stabilize macros in type position][36014]. Described in [RFC 873].
671 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
672 * [Fix `#[derive]` for empty tuple structs/variants][35728]
673 * [Fix lifetime rules for 'if' conditions][36029]
674 * [Avoid loading and parsing unconfigured non-inline modules][36482]
679 * [Add the `-C link-arg` argument][36574]
680 * [Remove the old AST-based backend from rustc_trans][35764]
681 * [Don't enable NEON by default on armv7 Linux][35814]
682 * [Fix debug line number info for macro expansions][35238]
683 * [Do not emit "class method" debuginfo for types that are not
684 DICompositeType][36008]
685 * [Warn about multiple conflicting #[repr] hints][34623]
686 * [When sizing DST, don't double-count nested struct prefixes][36351]
687 * [Default RUST_MIN_STACK to 16MiB for now][36505]
688 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
689 * [Reject macros with empty repetitions to avoid infinite loop][36721]
690 * [Expand macros without recursing to avoid stack overflows][36214]
695 * [Replace macro backtraces with labeled local uses][35702]
696 * [Improve error message for missplaced doc comments][33922]
697 * [Buffer unix and lock windows to prevent message interleaving][35975]
698 * [Update lifetime errors to specifically note temporaries][36171]
699 * [Special case a few colors for Windows][36178]
700 * [Suggest `use self` when such an import resolves][36289]
701 * [Be more specific when type parameter shadows primitive type][36338]
702 * Many minor improvements
704 Compile-time Optimizations
705 --------------------------
707 * [Compute and cache HIR hashes at beginning][35854]
708 * [Don't hash types in loan paths][36004]
709 * [Cache projections in trans][35761]
710 * [Optimize the parser's last token handling][36527]
711 * [Only instantiate #[inline] functions in codegen units referencing
712 them][36524]. This leads to big improvements in cases where crates export
713 define many inline functions without using them directly.
714 * [Lazily allocate TypedArena's first chunk][36592]
715 * [Don't allocate during default HashSet creation][36734]
722 * [`overflowing_abs`]
723 * [`RefCell::try_borrow`]
724 * [`RefCell::try_borrow_mut`]
729 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
730 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
732 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
733 * [Implement `Debug` for `std::vec::IntoIter`][35707]
734 * [`CString`: avoid excessive growth just to 0-terminate][35871]
735 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
736 * [Use arc4rand on FreeBSD][35884]
737 * [memrchr: Correct aligned offset computation][35969]
738 * [Improve Demangling of Rust Symbols][36059]
739 * [Use monotonic time in condition variables][35048]
740 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
741 * [Implement conversion traits for `char`][35755]
742 * [Fix illegal instruction caused by overflow in channel cloning][36104]
743 * [Zero first byte of CString on drop][36264]
744 * [Inherit overflow checks for sum and product][36372]
745 * [Add missing Eq implementations][36423]
746 * [Implement `Debug` for `DirEntry`][36631]
747 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
749 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
750 * [Implement more traits for `std::io::ErrorKind`][35911]
751 * [Optimize BinaryHeap bounds checking][36072]
752 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
753 `extend_with_element`][36355]
754 * [Fix overflow checking in unsigned pow()][34942]
759 * This release includes security fixes to both curl and OpenSSL.
760 * [Fix transitive doctests when panic=abort][cargo/3021]
761 * [Add --all-features flag to cargo][cargo/3038]
762 * [Reject path-based dependencies in `cargo package`][cargo/3060]
763 * [Don't parse the home directory more than once][cargo/3078]
764 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
765 * [Update OpenSSL to 1.0.2j][cargo/3121]
766 * [Add license and license_file to cargo metadata output][cargo/3110]
767 * [Make crates-io registry URL optional in config; ignore all changes to
768 source.crates-io][cargo/3089]
769 * [Don't download dependencies from other platforms][cargo/3123]
770 * [Build transitive dev-dependencies when needed][cargo/3125]
771 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
772 * [Avoid updating registry when adding existing deps][cargo/3144]
773 * [Warn about path overrides that won't work][cargo/3136]
774 * [Use workspaces during `cargo install`][cargo/3146]
775 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
776 * [Add --message-format flag][cargo/3000]
777 * [Pass target environment for rustdoc][cargo/3205]
778 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
779 * [Update curl and curl-sys][cargo/3241]
780 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
785 * [rustdoc: Add the `--sysroot` argument][36586]
786 * [rustdoc: Fix a couple of issues with the search results][35655]
787 * [rustdoc: remove the `!` from macro URLs and titles][35234]
788 * [gdb: Fix pretty-printing special-cased Rust types][35585]
789 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
794 * [Remove unmaintained style guide][35124]
795 * [Add s390x support][36369]
796 * [Initial work at Haiku OS support][36727]
797 * [Add mips-uclibc targets][35734]
798 * [Crate-ify compiler-rt into compiler-builtins][35021]
799 * [Add rustc version info (git hash + date) to dist tarball][36213]
800 * Many documentation improvements
805 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
806 * [Deny (by default) transmuting from fn item types to pointer-sized
807 types][34923]. Continuing the long transition to zero-sized fn items,
809 * [Fix `#[derive]` for empty tuple structs/variants][35728].
811 * [Issue deprecation warnings for safe accesses to extern statics][36173]
812 * [Fix lifetime rules for 'if' conditions][36029].
813 * [Inherit overflow checks for sum and product][36372].
814 * [Forbid user-defined macros named "macro_rules"][36730].
816 [33922]: https://github.com/rust-lang/rust/pull/33922
817 [34623]: https://github.com/rust-lang/rust/pull/34623
818 [34923]: https://github.com/rust-lang/rust/pull/34923
819 [34942]: https://github.com/rust-lang/rust/pull/34942
820 [34982]: https://github.com/rust-lang/rust/pull/34982
821 [35021]: https://github.com/rust-lang/rust/pull/35021
822 [35048]: https://github.com/rust-lang/rust/pull/35048
823 [35074]: https://github.com/rust-lang/rust/pull/35074
824 [35124]: https://github.com/rust-lang/rust/pull/35124
825 [35234]: https://github.com/rust-lang/rust/pull/35234
826 [35238]: https://github.com/rust-lang/rust/pull/35238
827 [35354]: https://github.com/rust-lang/rust/pull/35354
828 [35559]: https://github.com/rust-lang/rust/pull/35559
829 [35585]: https://github.com/rust-lang/rust/pull/35585
830 [35627]: https://github.com/rust-lang/rust/pull/35627
831 [35655]: https://github.com/rust-lang/rust/pull/35655
832 [35702]: https://github.com/rust-lang/rust/pull/35702
833 [35707]: https://github.com/rust-lang/rust/pull/35707
834 [35728]: https://github.com/rust-lang/rust/pull/35728
835 [35734]: https://github.com/rust-lang/rust/pull/35734
836 [35755]: https://github.com/rust-lang/rust/pull/35755
837 [35761]: https://github.com/rust-lang/rust/pull/35761
838 [35764]: https://github.com/rust-lang/rust/pull/35764
839 [35814]: https://github.com/rust-lang/rust/pull/35814
840 [35854]: https://github.com/rust-lang/rust/pull/35854
841 [35871]: https://github.com/rust-lang/rust/pull/35871
842 [35884]: https://github.com/rust-lang/rust/pull/35884
843 [35911]: https://github.com/rust-lang/rust/pull/35911
844 [35969]: https://github.com/rust-lang/rust/pull/35969
845 [35975]: https://github.com/rust-lang/rust/pull/35975
846 [36004]: https://github.com/rust-lang/rust/pull/36004
847 [36008]: https://github.com/rust-lang/rust/pull/36008
848 [36014]: https://github.com/rust-lang/rust/pull/36014
849 [36029]: https://github.com/rust-lang/rust/pull/36029
850 [36059]: https://github.com/rust-lang/rust/pull/36059
851 [36072]: https://github.com/rust-lang/rust/pull/36072
852 [36101]: https://github.com/rust-lang/rust/pull/36101
853 [36104]: https://github.com/rust-lang/rust/pull/36104
854 [36171]: https://github.com/rust-lang/rust/pull/36171
855 [36173]: https://github.com/rust-lang/rust/pull/36173
856 [36178]: https://github.com/rust-lang/rust/pull/36178
857 [36213]: https://github.com/rust-lang/rust/pull/36213
858 [36214]: https://github.com/rust-lang/rust/pull/36214
859 [36264]: https://github.com/rust-lang/rust/pull/36264
860 [36266]: https://github.com/rust-lang/rust/pull/36266
861 [36289]: https://github.com/rust-lang/rust/pull/36289
862 [36338]: https://github.com/rust-lang/rust/pull/36338
863 [36351]: https://github.com/rust-lang/rust/pull/36351
864 [36355]: https://github.com/rust-lang/rust/pull/36355
865 [36369]: https://github.com/rust-lang/rust/pull/36369
866 [36372]: https://github.com/rust-lang/rust/pull/36372
867 [36423]: https://github.com/rust-lang/rust/pull/36423
868 [36482]: https://github.com/rust-lang/rust/pull/36482
869 [36505]: https://github.com/rust-lang/rust/pull/36505
870 [36524]: https://github.com/rust-lang/rust/pull/36524
871 [36527]: https://github.com/rust-lang/rust/pull/36527
872 [36551]: https://github.com/rust-lang/rust/pull/36551
873 [36574]: https://github.com/rust-lang/rust/pull/36574
874 [36586]: https://github.com/rust-lang/rust/pull/36586
875 [36592]: https://github.com/rust-lang/rust/pull/36592
876 [36631]: https://github.com/rust-lang/rust/pull/36631
877 [36639]: https://github.com/rust-lang/rust/pull/36639
878 [36721]: https://github.com/rust-lang/rust/pull/36721
879 [36727]: https://github.com/rust-lang/rust/pull/36727
880 [36730]: https://github.com/rust-lang/rust/pull/36730
881 [36734]: https://github.com/rust-lang/rust/pull/36734
882 [36754]: https://github.com/rust-lang/rust/pull/36754
883 [36995]: https://github.com/rust-lang/rust/pull/36995
884 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
885 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
886 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
887 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
888 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
889 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
890 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
891 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
892 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
893 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
894 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
895 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
896 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
897 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
898 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
899 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
900 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
901 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
902 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
903 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
904 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
905 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
906 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
907 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
908 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
909 [rustup]: https://www.rustup.rs
910 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
911 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
912 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
913 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
914 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
915 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
916 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
919 Version 1.12.1 (2016-10-20)
920 ===========================
925 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
926 * [Confusion with double negation and booleans][36856]
927 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
928 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
929 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
930 * [Corrupted memory after updated to 1.12][36936]
931 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
932 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
933 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
935 [36381]: https://github.com/rust-lang/rust/issues/36381
936 [36856]: https://github.com/rust-lang/rust/issues/36856
937 [36875]: https://github.com/rust-lang/rust/issues/36875
938 [36924]: https://github.com/rust-lang/rust/issues/36924
939 [36926]: https://github.com/rust-lang/rust/issues/36926
940 [36936]: https://github.com/rust-lang/rust/issues/36936
941 [37026]: https://github.com/rust-lang/rust/issues/37026
942 [37112]: https://github.com/rust-lang/rust/issues/37112
943 [37153]: https://github.com/rust-lang/rust/issues/37153
946 Version 1.12.0 (2016-09-29)
947 ===========================
952 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)]
953 (https://github.com/rust-lang/rust/pull/34096).
954 This translation pass is far simpler than the previous AST->LLVM pass, and
955 creates opportunities to perform new optimizations directly on the MIR. It
956 was previously described [on the Rust blog]
957 (https://blog.rust-lang.org/2016/04/19/MIR.html).
958 * [`rustc` presents a new, more readable error format, along with
959 machine-readable JSON error output for use by IDEs]
960 (https://github.com/rust-lang/rust/pull/35401).
961 Most common editors supporting Rust have been updated to work with it. It was
962 previously described [on the Rust blog]
963 (https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
968 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)]
969 (https://github.com/rust-lang/rust/pull/34096).
970 This translation pass is far simpler than the previous AST->LLVM pass, and
971 creates opportunities to perform new optimizations directly on the MIR. It
972 was previously described [on the Rust blog]
973 (https://blog.rust-lang.org/2016/04/19/MIR.html).
974 * [Print the Rust target name, not the LLVM target name, with
975 `--print target-list`]
976 (https://github.com/rust-lang/rust/pull/35489)
977 * [The computation of `TypeId` is correct in some cases where it was previously
978 producing inconsistent results]
979 (https://github.com/rust-lang/rust/pull/35267)
980 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default]
981 (https://github.com/rust-lang/rust/pull/34910)
982 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
983 `--print relocation-models`, and `--print code-models` print the available
984 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
985 `-C code-model` code generation arguments]
986 (https://github.com/rust-lang/rust/pull/34845)
987 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
988 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`]
989 (https://github.com/rust-lang/rust/pull/35060).
990 These targets produce statically-linked binaries. There are no binary release
996 * [`rustc` presents a new, more readable error format, along with
997 machine-readable JSON error output for use by IDEs]
998 (https://github.com/rust-lang/rust/pull/35401).
999 Most common editors supporting Rust have been updated to work with it. It was
1000 previously described [on the Rust blog]
1001 (https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
1002 * [In error descriptions, references are now described in plain English,
1003 instead of as "&-ptr"]
1004 (https://github.com/rust-lang/rust/pull/35611)
1005 * [In error type descriptions, unknown numeric types are named `{integer}` or
1006 `{float}` instead of `_`]
1007 (https://github.com/rust-lang/rust/pull/35080)
1008 * [`rustc` emits a clearer error when inner attributes follow a doc comment]
1009 (https://github.com/rust-lang/rust/pull/34676)
1014 * [`macro_rules!` invocations can be made within `macro_rules!` invocations]
1015 (https://github.com/rust-lang/rust/pull/34925)
1016 * [`macro_rules!` meta-variables are hygienic]
1017 (https://github.com/rust-lang/rust/pull/35453)
1018 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
1020 (https://github.com/rust-lang/rust/pull/34908)
1021 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
1022 inside non-braces invocations]
1023 (https://github.com/rust-lang/rust/pull/34886)
1024 * [Semicolons are properly required as statement delimeters inside
1025 `macro_rules!` invocations]
1026 (https://github.com/rust-lang/rust/pull/34660)
1027 * [`cfg_attr` works on `path` attributes]
1028 (https://github.com/rust-lang/rust/pull/34546)
1034 (https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
1035 * [`RefCell::as_ptr`]
1036 (https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
1037 * [`IpAddr::is_unspecified`]
1038 (https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
1039 * [`IpAddr::is_loopback`]
1040 (https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
1041 * [`IpAddr::is_multicast`]
1042 (https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
1043 * [`Ipv4Addr::is_unspecified`]
1044 (https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
1045 * [`Ipv6Addr::octets`]
1046 (https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
1047 * [`LinkedList::contains`]
1048 (https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
1049 * [`VecDeque::contains`]
1050 (https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
1051 * [`ExitStatusExt::from_raw`]
1052 (https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
1053 Both on Unix and Windows.
1054 * [`Receiver::recv_timeout`]
1055 (https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
1056 * [`RecvTimeoutError`]
1057 (https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
1058 * [`BinaryHeap::peek_mut`]
1059 (https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
1061 (https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
1063 (https://doc.rust-lang.org/std/iter/trait.Product.html)
1065 (https://doc.rust-lang.org/std/iter/trait.Sum.html)
1066 * [`OccupiedEntry::remove_entry`]
1067 (https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
1068 * [`VacantEntry::into_key`]
1069 (https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
1074 * [The `format!` macro and friends now allow a single argument to be formatted
1076 (https://github.com/rust-lang/rust/pull/33642)
1077 * [The lifetime bounds on `[T]::binary_search_by` and
1078 `[T]::binary_search_by_key` have been adjusted to be more flexible]
1079 (https://github.com/rust-lang/rust/pull/34762)
1080 * [`Option` implements `From` for its contained type]
1081 (https://github.com/rust-lang/rust/pull/34828)
1082 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type]
1083 (https://github.com/rust-lang/rust/pull/35392)
1084 * [`RwLock` panics if the reader count overflows]
1085 (https://github.com/rust-lang/rust/pull/35378)
1086 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant]
1087 (https://github.com/rust-lang/rust/pull/35354)
1088 * [`vec::Drain` and `binary_heap::Drain` are covariant]
1089 (https://github.com/rust-lang/rust/pull/34951)
1090 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`]
1091 (https://github.com/rust-lang/rust/pull/35064)
1092 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`]
1093 (https://github.com/rust-lang/rust/pull/34946)
1094 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
1096 (https://github.com/rust-lang/rust/pull/34937)
1097 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
1099 (https://github.com/rust-lang/rust/pull/34885)
1100 * [`String` implements `AddAssign`]
1101 (https://github.com/rust-lang/rust/pull/34890)
1102 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
1103 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits]
1104 (https://github.com/rust-lang/rust/pull/34879)
1105 * [`FileType` implements `Debug`]
1106 (https://github.com/rust-lang/rust/pull/34757)
1107 * [References to `Mutex` and `RwLock` are unwind-safe]
1108 (https://github.com/rust-lang/rust/pull/34756)
1109 * [`mpsc::sync_channel` `Receiver`s return any available message before
1110 reporting a disconnect]
1111 (https://github.com/rust-lang/rust/pull/34731)
1112 * [Unicode definitions have been updated to 9.0]
1113 (https://github.com/rust-lang/rust/pull/34599)
1114 * [`env` iterators implement `DoubleEndedIterator`]
1115 (https://github.com/rust-lang/rust/pull/33312)
1120 * [Support local mirrors of registries]
1121 (https://github.com/rust-lang/cargo/pull/2857)
1122 * [Add support for command aliases]
1123 (https://github.com/rust-lang/cargo/pull/2679)
1124 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides]
1125 (https://github.com/rust-lang/cargo/pull/3007)
1126 * [Make `cargo doc --open --target` work as expected]
1127 (https://github.com/rust-lang/cargo/pull/2988)
1128 * [Speed up noop registry updates]
1129 (https://github.com/rust-lang/cargo/pull/2974)
1131 (https://github.com/rust-lang/cargo/pull/2971)
1132 * [Fix `--panic=abort` with plugins]
1133 (https://github.com/rust-lang/cargo/pull/2954)
1134 * [Always pass `-C metadata` to the compiler]
1135 (https://github.com/rust-lang/cargo/pull/2946)
1136 * [Fix depending on git repos with workspaces]
1137 (https://github.com/rust-lang/cargo/pull/2938)
1138 * [Add a `--lib` flag to `cargo new`]
1139 (https://github.com/rust-lang/cargo/pull/2921)
1140 * [Add `http.cainfo` for custom certs]
1141 (https://github.com/rust-lang/cargo/pull/2917)
1142 * [Indicate the compilation profile after compiling]
1143 (https://github.com/rust-lang/cargo/pull/2909)
1144 * [Allow enabling features for dependencies with `--features`]
1145 (https://github.com/rust-lang/cargo/pull/2876)
1146 * [Add `--jobs` flag to `cargo package`]
1147 (https://github.com/rust-lang/cargo/pull/2867)
1148 * [Add `--dry-run` to `cargo publish`]
1149 (https://github.com/rust-lang/cargo/pull/2849)
1150 * [Add support for `RUSTDOCFLAGS`]
1151 (https://github.com/rust-lang/cargo/pull/2794)
1156 * [`panic::catch_unwind` is more optimized]
1157 (https://github.com/rust-lang/rust/pull/35444)
1158 * [`panic::catch_unwind` no longer accesses thread-local storage on entry]
1159 (https://github.com/rust-lang/rust/pull/34866)
1164 * [Test binaries now support a `--test-threads` argument to specify the number
1165 of threads used to run tests, and which acts the same as the
1166 `RUST_TEST_THREADS` environment variable]
1167 (https://github.com/rust-lang/rust/pull/35414)
1168 * [The test runner now emits a warning when tests run over 60 seconds]
1169 (https://github.com/rust-lang/rust/pull/35405)
1170 * [rustdoc: Fix methods in search results]
1171 (https://github.com/rust-lang/rust/pull/34752)
1172 * [`rust-lldb` warns about unsupported versions of LLDB]
1173 (https://github.com/rust-lang/rust/pull/34646)
1174 * [Rust releases now come with source packages that can be installed by rustup
1175 via `rustup component add rust-src`]
1176 (https://github.com/rust-lang/rust/pull/34366).
1177 The resulting source code can be used by tools and IDES, located in the
1178 sysroot under `lib/rustlib/src`.
1183 * [The compiler can now be built against LLVM 3.9]
1184 (https://github.com/rust-lang/rust/pull/35594)
1185 * Many minor improvements to the documentation.
1186 * [The Rust exception handling "personality" routine is now written in Rust]
1187 (https://github.com/rust-lang/rust/pull/34832)
1192 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
1193 with the lowercase format instead of the uppercase]
1194 (https://github.com/rust-lang/rust/pull/35084)
1195 * [When formatting strings, if "precision" is specified, the "fill",
1196 "align" and "width" specifiers are no longer ignored]
1197 (https://github.com/rust-lang/rust/pull/34544)
1198 * [The `Debug` impl for strings no longer escapes all non-ASCII characters]
1199 (https://github.com/rust-lang/rust/pull/34485)
1202 Version 1.11.0 (2016-08-18)
1203 ===========================
1208 * [`cfg_attr` works on `path` attributes]
1209 (https://github.com/rust-lang/rust/pull/34546)
1210 * [Support nested `cfg_attr` attributes]
1211 (https://github.com/rust-lang/rust/pull/34216)
1212 * [Allow statement-generating braced macro invocations at the end of blocks]
1213 (https://github.com/rust-lang/rust/pull/34436)
1214 * [Macros can be expanded inside of trait definitions]
1215 (https://github.com/rust-lang/rust/pull/34213)
1216 * [`#[macro_use]` works properly when it is itself expanded from a macro]
1217 (https://github.com/rust-lang/rust/pull/34032)
1222 * [`BinaryHeap::append`]
1223 (https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
1224 * [`BTreeMap::append`]
1225 (https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
1226 * [`BTreeMap::split_off`]
1227 (https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
1228 * [`BTreeSet::append`]
1229 (https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
1230 * [`BTreeSet::split_off`]
1231 (https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
1232 * [`f32::to_degrees`]
1233 (https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
1234 (in libcore - previously stabilized in libstd)
1235 * [`f32::to_radians`]
1236 (https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
1237 (in libcore - previously stabilized in libstd)
1238 * [`f64::to_degrees`]
1239 (https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
1240 (in libcore - previously stabilized in libstd)
1241 * [`f64::to_radians`]
1242 (https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
1243 (in libcore - previously stabilized in libstd)
1245 (https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
1246 * [`Iterator::product`]
1247 (https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
1249 (https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
1250 * [`RefCell::get_mut`]
1251 (https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
1256 * [The `thread_local!` macro supports multiple definitions in a single
1257 invocation, and can apply attributes]
1258 (https://github.com/rust-lang/rust/pull/34077)
1259 * [`Cow` implements `Default`]
1260 (https://github.com/rust-lang/rust/pull/34305)
1261 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
1262 `Display` formatting]
1263 (https://github.com/rust-lang/rust/pull/34190)
1264 * [The range types implement `Hash`]
1265 (https://github.com/rust-lang/rust/pull/34180)
1266 * [`lookup_host` ignores unknown address types]
1267 (https://github.com/rust-lang/rust/pull/34067)
1268 * [`assert_eq!` accepts a custom error message, like `assert!` does]
1269 (https://github.com/rust-lang/rust/pull/33976)
1270 * [The main thread is now called "main" instead of "<main>"]
1271 (https://github.com/rust-lang/rust/pull/33803)
1276 * [Disallow specifying features of transitive deps]
1277 (https://github.com/rust-lang/cargo/pull/2821)
1278 * [Add color support for Windows consoles]
1279 (https://github.com/rust-lang/cargo/pull/2804)
1280 * [Fix `harness = false` on `[lib]` sections]
1281 (https://github.com/rust-lang/cargo/pull/2795)
1282 * [Don't panic when `links` contains a '.']
1283 (https://github.com/rust-lang/cargo/pull/2787)
1284 * [Build scripts can emit warnings]
1285 (https://github.com/rust-lang/cargo/pull/2630),
1286 and `-vv` prints warnings for all crates.
1287 * [Ignore file locks on OS X NFS mounts]
1288 (https://github.com/rust-lang/cargo/pull/2720)
1289 * [Don't warn about `package.metadata` keys]
1290 (https://github.com/rust-lang/cargo/pull/2668).
1291 This provides room for expansion by arbitrary tools.
1292 * [Add support for cdylib crate types]
1293 (https://github.com/rust-lang/cargo/pull/2741)
1294 * [Prevent publishing crates when files are dirty]
1295 (https://github.com/rust-lang/cargo/pull/2781)
1296 * [Don't fetch all crates on clean]
1297 (https://github.com/rust-lang/cargo/pull/2704)
1298 * [Propagate --color option to rustc]
1299 (https://github.com/rust-lang/cargo/pull/2779)
1300 * [Fix `cargo doc --open` on Windows]
1301 (https://github.com/rust-lang/cargo/pull/2780)
1302 * [Improve autocompletion]
1303 (https://github.com/rust-lang/cargo/pull/2772)
1304 * [Configure colors of stderr as well as stdout]
1305 (https://github.com/rust-lang/cargo/pull/2739)
1310 * [Caching projections speeds up type check dramatically for some
1312 (https://github.com/rust-lang/rust/pull/33816)
1313 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4]
1314 (https://github.com/rust-lang/rust/pull/33940)
1315 This hasher is faster, but is believed to provide sufficient
1316 protection from collision attacks.
1317 * [Comparison of `Ipv4Addr` is 10x faster]
1318 (https://github.com/rust-lang/rust/pull/33891)
1323 * [Fix empty implementation section on some module pages]
1324 (https://github.com/rust-lang/rust/pull/34536)
1325 * [Fix inlined renamed reexports in import lists]
1326 (https://github.com/rust-lang/rust/pull/34479)
1327 * [Fix search result layout for enum variants and struct fields]
1328 (https://github.com/rust-lang/rust/pull/34477)
1329 * [Fix issues with source links to external crates]
1330 (https://github.com/rust-lang/rust/pull/34387)
1331 * [Fix redirect pages for renamed reexports]
1332 (https://github.com/rust-lang/rust/pull/34245)
1337 * [rustc is better at finding the MSVC toolchain]
1338 (https://github.com/rust-lang/rust/pull/34492)
1339 * [When emitting debug info, rustc emits frame pointers for closures,
1340 shims and glue, as it does for all other functions]
1341 (https://github.com/rust-lang/rust/pull/33909)
1342 * [rust-lldb warns about unsupported versions of LLDB]
1343 (https://github.com/rust-lang/rust/pull/34646)
1344 * Many more errors have been given error codes and extended
1346 * API documentation continues to be improved, with many new examples
1351 * [rustc no longer hangs when dependencies recursively re-export
1353 (https://github.com/rust-lang/rust/pull/34542)
1354 * [rustc requires LLVM 3.7+]
1355 (https://github.com/rust-lang/rust/pull/34104)
1356 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
1358 (https://github.com/rust-lang/rust/pull/33895)
1359 * [rustc support 16-bit pointer sizes]
1360 (https://github.com/rust-lang/rust/pull/33460).
1361 No targets use this yet, but it works toward AVR support.
1366 * [`const`s and `static`s may not have unsized types]
1367 (https://github.com/rust-lang/rust/pull/34443)
1368 * [The new follow-set rules that place restrictions on `macro_rules!`
1369 in order to ensure syntax forward-compatibility have been enabled]
1370 (https://github.com/rust-lang/rust/pull/33982)
1371 This was an [ammendment to RFC 550]
1372 (https://github.com/rust-lang/rfcs/pull/1384),
1373 and has been a warning since 1.10.
1374 * [`cfg` attribute process has been refactored to fix various bugs]
1375 (https://github.com/rust-lang/rust/pull/33706).
1376 This causes breakage in some corner cases.
1379 Version 1.10.0 (2016-07-07)
1380 ===========================
1385 * [Allow `concat_idents!` in type positions as well as in expression
1387 (https://github.com/rust-lang/rust/pull/33735).
1388 * [`Copy` types are required to have a trivial implementation of `Clone`]
1389 (https://github.com/rust-lang/rust/pull/33420).
1390 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
1391 * [Single-variant enums support the `#[repr(..)]` attribute]
1392 (https://github.com/rust-lang/rust/pull/33355).
1393 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods]
1394 (https://github.com/rust-lang/rust/pull/32908).
1395 * [`panic!` can be converted to a runtime abort with the
1396 `-C panic=abort` flag]
1397 (https://github.com/rust-lang/rust/pull/32900).
1398 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
1399 * [Add a new crate type, 'cdylib']
1400 (https://github.com/rust-lang/rust/pull/33553).
1401 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
1402 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-rdylib.md).
1403 Note that Cargo does not yet directly support cdylibs.
1408 * `os::windows::fs::OpenOptionsExt::access_mode`
1409 * `os::windows::fs::OpenOptionsExt::share_mode`
1410 * `os::windows::fs::OpenOptionsExt::custom_flags`
1411 * `os::windows::fs::OpenOptionsExt::attributes`
1412 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
1413 * `os::unix::fs::OpenOptionsExt::custom_flags`
1414 * [`sync::Weak::new`]
1415 (http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
1416 * `Default for sync::Weak`
1417 * [`panic::set_hook`]
1418 (http://doc.rust-lang.org/std/panic/fn.set_hook.html)
1419 * [`panic::take_hook`]
1420 (http://doc.rust-lang.org/std/panic/fn.take_hook.html)
1421 * [`panic::PanicInfo`]
1422 (http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
1423 * [`panic::PanicInfo::payload`]
1424 (http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
1425 * [`panic::PanicInfo::location`]
1426 (http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
1427 * [`panic::Location`]
1428 (http://doc.rust-lang.org/std/panic/struct.Location.html)
1429 * [`panic::Location::file`]
1430 (http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
1431 * [`panic::Location::line`]
1432 (http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
1433 * [`ffi::CStr::from_bytes_with_nul`]
1434 (http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
1435 * [`ffi::CStr::from_bytes_with_nul_unchecked`]
1436 (http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
1437 * [`ffi::FromBytesWithNulError`]
1438 (http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
1439 * [`fs::Metadata::modified`]
1440 (http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
1441 * [`fs::Metadata::accessed`]
1442 (http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
1443 * [`fs::Metadata::created`]
1444 (http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
1445 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
1446 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
1447 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
1448 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
1449 * [`SocketAddr::is_unnamed`]
1450 (http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
1451 * [`SocketAddr::as_pathname`]
1452 (http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
1453 * [`UnixStream::connect`]
1454 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
1455 * [`UnixStream::pair`]
1456 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
1457 * [`UnixStream::try_clone`]
1458 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
1459 * [`UnixStream::local_addr`]
1460 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
1461 * [`UnixStream::peer_addr`]
1462 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
1463 * [`UnixStream::set_read_timeout`]
1464 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
1465 * [`UnixStream::set_write_timeout`]
1466 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
1467 * [`UnixStream::read_timeout`]
1468 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
1469 * [`UnixStream::write_timeout`]
1470 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
1471 * [`UnixStream::set_nonblocking`]
1472 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
1473 * [`UnixStream::take_error`]
1474 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
1475 * [`UnixStream::shutdown`]
1476 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
1477 * Read/Write/RawFd impls for `UnixStream`
1478 * [`UnixListener::bind`]
1479 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
1480 * [`UnixListener::accept`]
1481 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
1482 * [`UnixListener::try_clone`]
1483 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
1484 * [`UnixListener::local_addr`]
1485 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
1486 * [`UnixListener::set_nonblocking`]
1487 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
1488 * [`UnixListener::take_error`]
1489 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
1490 * [`UnixListener::incoming`]
1491 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
1492 * RawFd impls for `UnixListener`
1493 * [`UnixDatagram::bind`]
1494 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
1495 * [`UnixDatagram::unbound`]
1496 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
1497 * [`UnixDatagram::pair`]
1498 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
1499 * [`UnixDatagram::connect`]
1500 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
1501 * [`UnixDatagram::try_clone`]
1502 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
1503 * [`UnixDatagram::local_addr`]
1504 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
1505 * [`UnixDatagram::peer_addr`]
1506 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
1507 * [`UnixDatagram::recv_from`]
1508 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
1509 * [`UnixDatagram::recv`]
1510 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
1511 * [`UnixDatagram::send_to`]
1512 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
1513 * [`UnixDatagram::send`]
1514 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
1515 * [`UnixDatagram::set_read_timeout`]
1516 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
1517 * [`UnixDatagram::set_write_timeout`]
1518 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
1519 * [`UnixDatagram::read_timeout`]
1520 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
1521 * [`UnixDatagram::write_timeout`]
1522 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
1523 * [`UnixDatagram::set_nonblocking`]
1524 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
1525 * [`UnixDatagram::take_error`]
1526 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
1527 * [`UnixDatagram::shutdown`]
1528 (http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
1529 * RawFd impls for `UnixDatagram`
1530 * `{BTree,Hash}Map::values_mut`
1531 * [`<[_]>::binary_search_by_key`]
1532 (http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
1537 * [The `abs_sub` method of floats is deprecated]
1538 (https://github.com/rust-lang/rust/pull/33664).
1539 The semantics of this minor method are subtle and probably not what
1541 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord]
1542 (https://github.com/rust-lang/rust/pull/33306).
1543 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
1544 will fall back to `/dev/urandom` temporarily to avoid blocking
1546 (https://github.com/rust-lang/rust/pull/33086).
1547 * [Implemented negation for wrapping numerals]
1548 (https://github.com/rust-lang/rust/pull/33067).
1549 * [Implement `Clone` for `binary_heap::IntoIter`]
1550 (https://github.com/rust-lang/rust/pull/33050).
1551 * [Implement `Display` and `Hash` for `std::num::Wrapping`]
1552 (https://github.com/rust-lang/rust/pull/33023).
1553 * [Add `Default` implementation for `&CStr`, `CString`]
1554 (https://github.com/rust-lang/rust/pull/32990).
1555 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`]
1556 (https://github.com/rust-lang/rust/pull/32866).
1557 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
1559 (https://github.com/rust-lang/rust/pull/32785).
1563 * [Cargo.toml supports the `profile.*.panic` option]
1564 (https://github.com/rust-lang/cargo/pull/2687).
1565 This controls the runtime behavior of the `panic!` macro
1566 and can be either "unwind" (the default), or "abort".
1567 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
1568 * [Don't throw away errors with `-p` arguments]
1569 (https://github.com/rust-lang/cargo/pull/2723).
1570 * [Report status to stderr instead of stdout]
1571 (https://github.com/rust-lang/cargo/pull/2693).
1572 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
1573 variable that corresponds to the `links` field of the manifest]
1574 (https://github.com/rust-lang/cargo/pull/2710).
1575 * [Ban keywords from crate names]
1576 (https://github.com/rust-lang/cargo/pull/2707).
1577 * [Canonicalize `CARGO_HOME` on Windows]
1578 (https://github.com/rust-lang/cargo/pull/2604).
1579 * [Retry network requests]
1580 (https://github.com/rust-lang/cargo/pull/2396).
1581 By default they are retried twice, which can be customized with the
1582 `net.retry` value in `.cargo/config`.
1583 * [Don't print extra error info for failing subcommands]
1584 (https://github.com/rust-lang/cargo/pull/2674).
1585 * [Add `--force` flag to `cargo install`]
1586 (https://github.com/rust-lang/cargo/pull/2405).
1587 * [Don't use `flock` on NFS mounts]
1588 (https://github.com/rust-lang/cargo/pull/2623).
1589 * [Prefer building `cargo install` artifacts in temporary directories]
1590 (https://github.com/rust-lang/cargo/pull/2610).
1591 Makes it possible to install multiple crates in parallel.
1592 * [Add `cargo test --doc`]
1593 (https://github.com/rust-lang/cargo/pull/2578).
1594 * [Add `cargo --explain`]
1595 (https://github.com/rust-lang/cargo/pull/2551).
1596 * [Don't print warnings when `-q` is passed]
1597 (https://github.com/rust-lang/cargo/pull/2576).
1598 * [Add `cargo doc --lib` and `--bin`]
1599 (https://github.com/rust-lang/cargo/pull/2577).
1600 * [Don't require build script output to be UTF-8]
1601 (https://github.com/rust-lang/cargo/pull/2560).
1602 * [Correctly attempt multiple git usernames]
1603 (https://github.com/rust-lang/cargo/pull/2584).
1608 * [rustc memory usage was reduced by refactoring the context used for
1610 (https://github.com/rust-lang/rust/pull/33425).
1611 * [Speed up creation of `HashMap`s by caching the random keys used
1612 to initialize the hash state]
1613 (https://github.com/rust-lang/rust/pull/33318).
1614 * [The `find` implementation for `Chain` iterators is 2x faster]
1615 (https://github.com/rust-lang/rust/pull/33289).
1616 * [Trait selection optimizations speed up type checking by 15%]
1617 (https://github.com/rust-lang/rust/pull/33138).
1618 * [Efficient trie lookup for boolean Unicode properties]
1619 (https://github.com/rust-lang/rust/pull/33098).
1620 10x faster than the previous lookup tables.
1621 * [Special case `#[derive(Copy, Clone)]` to avoid bloat]
1622 (https://github.com/rust-lang/rust/pull/31414).
1627 * Many incremental improvements to documentation and rustdoc.
1628 * [rustdoc: List blanket trait impls]
1629 (https://github.com/rust-lang/rust/pull/33514).
1630 * [rustdoc: Clean up ABI rendering]
1631 (https://github.com/rust-lang/rust/pull/33151).
1632 * [Indexing with the wrong type produces a more informative error]
1633 (https://github.com/rust-lang/rust/pull/33401).
1634 * [Improve diagnostics for constants being used in irrefutable patterns]
1635 (https://github.com/rust-lang/rust/pull/33406).
1636 * [When many method candidates are in scope limit the suggestions to 10]
1637 (https://github.com/rust-lang/rust/pull/33338).
1638 * [Remove confusing suggestion when calling a `fn` type]
1639 (https://github.com/rust-lang/rust/pull/33325).
1640 * [Do not suggest changing `&mut self` to `&mut mut self`]
1641 (https://github.com/rust-lang/rust/pull/33319).
1646 * [Update i686-linux-android features to match Android ABI]
1647 (https://github.com/rust-lang/rust/pull/33651).
1648 * [Update aarch64-linux-android features to match Android ABI]
1649 (https://github.com/rust-lang/rust/pull/33500).
1650 * [`std` no longer prints backtraces on platforms where the running
1651 module must be loaded with `env::current_exe`, which can't be relied
1652 on](https://github.com/rust-lang/rust/pull/33554).
1653 * This release includes std binaries for the i586-unknown-linux-gnu,
1654 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
1655 i586 target is for old x86 hardware without SSE2, and the armv7
1656 target is for Android running on modern ARM architectures.
1657 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
1658 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
1659 * [On Unix the runtime aborts by calling `libc::abort` instead of
1660 generating an illegal instruction]
1661 (https://github.com/rust-lang/rust/pull/31457).
1662 * [Rust is now bootstrapped from the previous release of Rust,
1663 instead of a snapshot from an arbitrary commit]
1664 (https://github.com/rust-lang/rust/pull/32942).
1669 * [`AtomicBool` is now bool-sized, not word-sized]
1670 (https://github.com/rust-lang/rust/pull/33579).
1671 * [`target_env` for Linux ARM targets is just `gnu`, not
1672 `gnueabihf`, `gnueabi`, etc]
1673 (https://github.com/rust-lang/rust/pull/33403).
1674 * [Consistently panic on overflow in `Duration::new`]
1675 (https://github.com/rust-lang/rust/pull/33072).
1676 * [Change `String::truncate` to panic less]
1677 (https://github.com/rust-lang/rust/pull/32977).
1678 * [Add `:block` to the follow set for `:ty` and `:path`]
1679 (https://github.com/rust-lang/rust/pull/32945).
1680 Affects how macros are parsed.
1681 * [Fix macro hygiene bug]
1682 (https://github.com/rust-lang/rust/pull/32923).
1683 * [Feature-gated attributes on macro-generated macro invocations are
1685 (https://github.com/rust-lang/rust/pull/32791).
1686 * [Suppress fallback and ambiguity errors during type inference]
1687 (https://github.com/rust-lang/rust/pull/32258).
1688 This caused some minor changes to type inference.
1691 Version 1.9.0 (2016-05-26)
1692 ==========================
1697 * The `#[deprecated]` attribute when applied to an API will generate
1698 warnings when used. The warnings may be suppressed with
1699 `#[allow(deprecated)]`. [RFC 1270].
1700 * [`fn` item types are zero sized, and each `fn` names a unique
1701 type][1.9fn]. This will break code that transmutes `fn`s, so calling
1702 `transmute` on a `fn` type will generate a warning for a few cycles,
1703 then will be converted to an error.
1704 * [Field and method resolution understand visibility, so private
1705 fields and methods cannot prevent the proper use of public fields
1706 and methods][1.9fv].
1707 * [The parser considers unicode codepoints in the
1708 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
1714 * [`std::panic::catch_unwind`][] (renamed from `recover`)
1715 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
1716 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
1717 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
1718 * [`str::is_char_boundary`]
1719 * [`<*const T>::as_ref`]
1720 * [`<*mut T>::as_ref`]
1721 * [`<*mut T>::as_mut`]
1722 * [`AsciiExt::make_ascii_uppercase`]
1723 * [`AsciiExt::make_ascii_lowercase`]
1724 * [`char::decode_utf16`]
1725 * [`char::DecodeUtf16`]
1726 * [`char::DecodeUtf16Error`]
1727 * [`char::DecodeUtf16Error::unpaired_surrogate`]
1728 * [`BTreeSet::take`]
1729 * [`BTreeSet::replace`]
1732 * [`HashSet::replace`]
1734 * [`OsString::with_capacity`]
1735 * [`OsString::clear`]
1736 * [`OsString::capacity`]
1737 * [`OsString::reserve`]
1738 * [`OsString::reserve_exact`]
1739 * [`OsStr::is_empty`]
1741 * [`std::os::unix::thread`]
1744 * [`JoinHandleExt::as_pthread_t`]
1745 * [`JoinHandleExt::into_pthread_t`]
1746 * [`HashSet::hasher`]
1747 * [`HashMap::hasher`]
1748 * [`CommandExt::exec`]
1749 * [`File::try_clone`]
1750 * [`SocketAddr::set_ip`]
1751 * [`SocketAddr::set_port`]
1752 * [`SocketAddrV4::set_ip`]
1753 * [`SocketAddrV4::set_port`]
1754 * [`SocketAddrV6::set_ip`]
1755 * [`SocketAddrV6::set_port`]
1756 * [`SocketAddrV6::set_flowinfo`]
1757 * [`SocketAddrV6::set_scope_id`]
1758 * [`slice::copy_from_slice`]
1759 * [`ptr::read_volatile`]
1760 * [`ptr::write_volatile`]
1761 * [`OpenOptions::create_new`]
1762 * [`TcpStream::set_nodelay`]
1763 * [`TcpStream::nodelay`]
1764 * [`TcpStream::set_ttl`]
1765 * [`TcpStream::ttl`]
1766 * [`TcpStream::set_only_v6`]
1767 * [`TcpStream::only_v6`]
1768 * [`TcpStream::take_error`]
1769 * [`TcpStream::set_nonblocking`]
1770 * [`TcpListener::set_ttl`]
1771 * [`TcpListener::ttl`]
1772 * [`TcpListener::set_only_v6`]
1773 * [`TcpListener::only_v6`]
1774 * [`TcpListener::take_error`]
1775 * [`TcpListener::set_nonblocking`]
1776 * [`UdpSocket::set_broadcast`]
1777 * [`UdpSocket::broadcast`]
1778 * [`UdpSocket::set_multicast_loop_v4`]
1779 * [`UdpSocket::multicast_loop_v4`]
1780 * [`UdpSocket::set_multicast_ttl_v4`]
1781 * [`UdpSocket::multicast_ttl_v4`]
1782 * [`UdpSocket::set_multicast_loop_v6`]
1783 * [`UdpSocket::multicast_loop_v6`]
1784 * [`UdpSocket::set_multicast_ttl_v6`]
1785 * [`UdpSocket::multicast_ttl_v6`]
1786 * [`UdpSocket::set_ttl`]
1787 * [`UdpSocket::ttl`]
1788 * [`UdpSocket::set_only_v6`]
1789 * [`UdpSocket::only_v6`]
1790 * [`UdpSocket::join_multicast_v4`]
1791 * [`UdpSocket::join_multicast_v6`]
1792 * [`UdpSocket::leave_multicast_v4`]
1793 * [`UdpSocket::leave_multicast_v6`]
1794 * [`UdpSocket::take_error`]
1795 * [`UdpSocket::connect`]
1796 * [`UdpSocket::send`]
1797 * [`UdpSocket::recv`]
1798 * [`UdpSocket::set_nonblocking`]
1803 * [`std::sync::Once` is poisoned if its initialization function
1805 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
1806 * [Most types implement `fmt::Debug`][1.9db].
1807 * [The default buffer size used by `BufReader` and `BufWriter` was
1808 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
1809 used by other languages.
1810 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
1811 `Duration` additionally implements `*=` and `/=`][1.9ta].
1812 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
1813 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
1814 * [`Chain` implements `BufRead`][1.9ch].
1815 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
1820 * [Cargo can now run concurrently][1.9cc].
1821 * [Top-level overrides allow specific revisions of crates to be
1822 overridden through the entire crate graph][1.9ct]. This is intended
1823 to make upgrades easier for large projects, by allowing crates to be
1824 forked temporarily until they've been upgraded and republished.
1825 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
1826 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
1827 on the commandline][1.9cf]. `rustc` arguments can also be specified
1828 in the `build.rustflags` configuration key.
1833 * [The time complexity of comparing variables for equivalence during type
1834 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
1835 to major compilation time improvement in some scenarios.
1836 * [`ToString` is specialized for `str`, giving it the same performance
1837 as `to_owned`][1.9ts].
1838 * [Spawning processes with `Command::output` no longer creates extra
1840 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
1841 for C-like enums][1.9cl].
1846 * [Passing the `--quiet` flag to a test runner will produce
1847 much-abbreviated output][1.9q].
1848 * The Rust Project now publishes std binaries for the
1849 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
1850 `i586-pc-windows-msvc` targets.
1855 * [`std::sync::Once` is poisoned if its initialization function
1857 * [It is illegal to define methods with the same name in overlapping
1858 inherent `impl` blocks][1.9sn].
1859 * [`fn` item types are zero sized, and each `fn` names a unique
1860 type][1.9fn]. This will break code that transmutes `fn`s, so calling
1861 `transmute` on a `fn` type will generate a warning for a few cycles,
1862 then will be converted to an error.
1863 * [Improvements to const evaluation may trigger new errors when integer
1864 literals are out of range][1.9ce].
1867 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
1868 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
1869 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
1870 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
1871 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
1872 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
1873 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
1874 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
1875 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
1876 [1.9db]: https://github.com/rust-lang/rust/pull/32054
1877 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
1878 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
1879 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
1880 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
1881 [1.9o]: https://github.com/rust-lang/rust/pull/32325
1882 [1.9q]: https://github.com/rust-lang/rust/pull/31887
1883 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
1884 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
1885 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
1886 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
1887 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
1888 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
1889 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
1890 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
1891 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
1892 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
1893 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
1894 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
1895 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
1896 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
1897 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
1898 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
1899 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
1900 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
1901 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
1902 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
1903 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
1904 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
1905 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
1906 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
1907 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
1908 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
1909 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
1910 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
1911 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
1912 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
1913 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
1914 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
1915 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
1916 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
1917 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
1918 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
1919 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
1920 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
1921 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
1922 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
1923 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
1924 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
1925 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
1926 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
1927 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
1928 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
1929 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
1930 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
1931 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
1932 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
1933 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
1934 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
1935 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
1936 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
1937 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
1938 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
1939 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
1940 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
1941 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
1942 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
1943 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
1944 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
1945 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
1946 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
1947 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
1948 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
1949 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
1950 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
1951 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
1952 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
1953 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
1954 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
1955 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
1956 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
1957 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
1958 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
1959 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
1960 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
1961 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
1962 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
1963 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
1964 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
1965 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
1966 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
1967 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
1968 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
1969 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
1970 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
1971 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
1972 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
1973 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
1974 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
1975 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
1976 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
1979 Version 1.8.0 (2016-04-14)
1980 ==========================
1985 * Rust supports overloading of compound assignment statements like
1986 `+=` by implementing the [`AddAssign`], [`SubAssign`],
1987 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
1988 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
1990 * Empty structs can be defined with braces, as in `struct Foo { }`, in
1991 addition to the non-braced form, `struct Foo;`. [RFC 218].
1997 * [`str::encode_utf16`][] (renamed from `utf16_units`)
1998 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
2001 * [`ptr::drop_in_place`]
2003 * [`time::SystemTime`]
2005 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
2006 * [`Instant::elapsed`]
2007 * [`SystemTime::now`]
2008 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
2009 * [`SystemTime::elapsed`]
2010 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
2011 * [`SystemTimeError`]
2012 * [`SystemTimeError::duration`]
2013 * Various impls for `SystemTimeError`
2015 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
2016 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
2017 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
2018 * [The `write!` and `writeln!` macros correctly emit errors if any of
2019 their arguments can't be formatted][1.8w].
2020 * [Various I/O functions support large files on 32-bit Linux][1.8l].
2021 * [The Unix-specific `raw` modules, which contain a number of
2022 redefined C types are deprecated][1.8r], including `os::raw::unix`,
2023 `os::raw::macos`, and `os::raw::linux`. These modules defined types
2024 such as `ino_t` and `dev_t`. The inconsistency of these definitions
2025 across platforms was making it difficult to implement `std`
2026 correctly. Those that need these definitions should use the `libc`
2028 * The Unix-specific `MetadataExt` traits, including
2029 `os::unix::fs::MetadataExt`, which expose values such as inode
2030 numbers [no longer return platform-specific types][1.8r], but
2031 instead return widened integers. [RFC 1415].
2032 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
2033 * [Atomic loads and stores are not volatile][1.8a].
2034 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
2039 * [Inlining hash functions lead to a 3% compile-time improvement in
2040 some workloads][1.8h].
2041 * When using jemalloc, its symbols are [unprefixed so that it
2042 overrides the libc malloc implementation][1.8h]. This means that for
2043 rustc, LLVM is now using jemalloc, which results in a 6%
2044 compile-time improvement on a specific workload.
2045 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
2050 * [32-bit MSVC builds finally implement unwinding][1.8ms].
2051 i686-pc-windows-msvc is now considered a tier-1 platform.
2052 * [The `--print targets` flag prints a list of supported targets][1.8t].
2053 * [The `--print cfg` flag prints the `cfg`s defined for the current
2055 * [`rustc` can be built with an new Cargo-based build system, written
2056 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
2057 build system. To enable it configure with `configure --rustbuild`.
2058 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
2059 variants while also indicating the total number of missing variants
2060 if more than 3][1.8m].
2061 * [Executable stacks are disabled on Linux and BSD][1.8nx].
2062 * The Rust Project now publishes binary releases of the standard
2063 library for a number of tier-2 targets:
2064 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
2065 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
2066 `x86_64-rumprun-netbsd`. These can be installed with
2067 tools such as [multirust][1.8mr].
2072 * [`cargo init` creates a new Cargo project in the current
2073 directory][1.8ci]. It is otherwise like `cargo new`.
2074 * [Cargo has configuration keys for `-v` and
2075 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
2076 `[term]` section of `.cargo/config`.
2077 * [Configuration keys that evaluate to strings or integers can be set
2078 via environment variables][1.8ce]. For example the `build.jobs` key
2079 can be set via `CARGO_BUILD_JOBS`. Environment variables take
2080 precedence over config files.
2081 * [Target-specific dependencies support Rust `cfg` syntax for
2082 describing targets][1.8cfg] so that dependencies for multiple
2083 targets can be specified together. [RFC 1361].
2084 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
2085 `RUSTDOC` take precedence over the `build.target-dir`,
2086 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
2087 * [The child process tree is killed on Windows when Cargo is
2089 * [The `build.target` configuration value sets the target platform,
2090 like `--target`][1.8ct].
2095 * [Unstable compiler flags have been further restricted][1.8u]. Since
2096 1.0 `-Z` flags have been considered unstable, and other flags that
2097 were considered unstable additionally required passing `-Z
2098 unstable-options` to access. Unlike unstable language and library
2099 features though, these options have been accessible on the stable
2100 release channel. Going forward, *new unstable flags will not be
2101 available on the stable release channel*, and old unstable flags
2102 will warn about their usage. In the future, all unstable flags will
2103 be unavailable on the stable release channel.
2104 * [It is no longer possible to `match` on empty enum variants using
2105 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
2106 * The Unix-specific `MetadataExt` traits, including
2107 `os::unix::fs::MetadataExt`, which expose values such as inode
2108 numbers [no longer return platform-specific types][1.8r], but
2109 instead return widened integers. [RFC 1415].
2110 * [Modules sourced from the filesystem cannot appear within arbitrary
2111 blocks, but only within other modules][1.8mf].
2112 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
2113 * On Unix, [stack overflow triggers a runtime abort instead of a
2115 * [`Command::spawn` and its equivalents return an error if any of
2116 its command-line arguments contain interior `NUL`s][1.8n].
2117 * [Tuple and unit enum variants from other crates are in the type
2119 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
2120 type instead of `.a` files][1.8st]. Additionally, for the MSVC
2121 toolchain, `rustc` emits import libraries named `foo.dll.lib`
2122 instead of `foo.lib`.
2125 [1.8a]: https://github.com/rust-lang/rust/pull/30962
2126 [1.8b]: https://github.com/rust-lang/rust/pull/31123
2127 [1.8c]: https://github.com/rust-lang/rust/pull/31530
2128 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
2129 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
2130 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
2131 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
2132 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
2133 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
2134 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
2135 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
2136 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
2137 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
2138 [1.8h]: https://github.com/rust-lang/rust/pull/31460
2139 [1.8l]: https://github.com/rust-lang/rust/pull/31668
2140 [1.8m]: https://github.com/rust-lang/rust/pull/31020
2141 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
2142 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
2143 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
2144 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
2145 [1.8n]: https://github.com/rust-lang/rust/pull/31056
2146 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
2147 [1.8r]: https://github.com/rust-lang/rust/pull/31551
2148 [1.8so]: https://github.com/rust-lang/rust/pull/31333
2149 [1.8st]: https://github.com/rust-lang/rust/pull/29520
2150 [1.8t]: https://github.com/rust-lang/rust/pull/31358
2151 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
2152 [1.8u]: https://github.com/rust-lang/rust/pull/31793
2153 [1.8v]: https://github.com/rust-lang/rust/pull/31757
2154 [1.8w]: https://github.com/rust-lang/rust/pull/31904
2155 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
2156 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
2157 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
2158 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
2159 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
2160 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
2161 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
2162 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
2163 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
2164 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
2165 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
2166 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
2167 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
2168 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
2169 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
2170 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
2171 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
2172 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
2173 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
2174 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
2175 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
2176 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
2177 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
2178 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
2179 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
2180 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
2181 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
2182 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
2183 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
2184 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
2187 Version 1.7.0 (2016-03-03)
2188 ==========================
2195 * [`Path::strip_prefix`][] (renamed from relative_from)
2196 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
2198 * [`Ipv4Addr::is_loopback`]
2199 * [`Ipv4Addr::is_private`]
2200 * [`Ipv4Addr::is_link_local`]
2201 * [`Ipv4Addr::is_multicast`]
2202 * [`Ipv4Addr::is_broadcast`]
2203 * [`Ipv4Addr::is_documentation`]
2205 * [`Ipv6Addr::is_unspecified`]
2206 * [`Ipv6Addr::is_loopback`]
2207 * [`Ipv6Addr::is_multicast`]
2210 * [`Vec::as_mut_slice`]
2212 * [`String::as_str`]
2213 * [`String::as_mut_str`]
2215 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
2217 * `<[T]>::`[`sort_by_key`]
2218 * checked, saturated, and overflowing operations
2219 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
2220 * [`i32::saturating_mul`]
2221 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
2222 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
2223 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
2224 * [`u32::saturating_mul`]
2225 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
2226 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
2227 * and checked, saturated, and overflowing operations for other primitive types
2229 * [`ffi::IntoStringError`]
2230 * [`CString::into_string`]
2231 * [`CString::into_bytes`]
2232 * [`CString::into_bytes_with_nul`]
2233 * `From<CString> for Vec<u8>`
2235 * [`IntoStringError::into_cstring`]
2236 * [`IntoStringError::utf8_error`]
2237 * `Error for IntoStringError`
2239 * [`std::hash::BuildHasher`]
2240 * [`BuildHasher::Hasher`]
2241 * [`BuildHasher::build_hasher`]
2242 * [`std::hash::BuildHasherDefault`]
2243 * [`HashMap::with_hasher`]
2244 * [`HashMap::with_capacity_and_hasher`]
2245 * [`HashSet::with_hasher`]
2246 * [`HashSet::with_capacity_and_hasher`]
2247 * [`std::collections::hash_map::RandomState`]
2248 * [`RandomState::new`]
2249 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
2250 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
2251 from bytes is faster.
2252 * [The performance of `LineWriter` (and thus `io::stdout`) was
2253 improved by using `memchr` to search for newlines][1.7m].
2254 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
2255 `f64` variants were stabilized previously.
2256 * [`BTreeMap` was rewritten to use less memory and improve the performance
2257 of insertion and iteration, the latter by as much as 5x][1.7bm].
2258 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
2259 covariant over their contained type][1.7bt].
2260 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
2261 over their contained type][1.7ll].
2262 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
2264 * [`Any` is implemented for unsized types][1.7a].
2265 * [`Hash` is implemented for `Duration`][1.7h].
2270 * [When running tests with `--test`, rustdoc will pass `--cfg`
2271 arguments to the compiler][1.7dt].
2272 * [The compiler is built with RPATH information by default][1.7rpa].
2273 This means that it will be possible to run `rustc` when installed in
2274 unusual configurations without configuring the dynamic linker search
2276 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
2277 any RPATH entries (emitted with `-C rpath`) *not* take precedence
2278 over `LD_LIBRARY_PATH`.
2283 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
2284 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
2285 * [The `rerun-if-changed` build script directive no longer causes the
2286 build script to incorrectly run twice in certain scenarios][1.7rr].
2291 * Soundness fixes to the interactions between associated types and
2292 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
2293 code that violates the new rules. This is a significant change that
2294 is known to break existing code, so it has emitted warnings for the
2295 new error cases since 1.4 to give crate authors time to adapt. The
2296 details of what is changing are subtle; read the RFC for more.
2297 * [Several bugs in the compiler's visibility calculations were
2298 fixed][1.7v]. Since this was found to break significant amounts of
2299 code, the new errors will be emitted as warnings for several release
2300 cycles, under the `private_in_public` lint.
2301 * Defaulted type parameters were accidentally accepted in positions
2302 that were not intended. In this release, [defaulted type parameters
2303 appearing outside of type definitions will generate a
2304 warning][1.7d], which will become an error in future releases.
2305 * [Parsing "." as a float results in an error instead of 0][1.7p].
2306 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
2307 * [Borrows of closure parameters may not outlive the closure][1.7bc].
2309 [1.7a]: https://github.com/rust-lang/rust/pull/30928
2310 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
2311 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
2312 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
2313 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
2314 [1.7d]: https://github.com/rust-lang/rust/pull/30724
2315 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
2316 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
2317 [1.7f]: https://github.com/rust-lang/rust/pull/30672
2318 [1.7h]: https://github.com/rust-lang/rust/pull/30818
2319 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
2320 [1.7m]: https://github.com/rust-lang/rust/pull/30381
2321 [1.7p]: https://github.com/rust-lang/rust/pull/30681
2322 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
2323 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
2324 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
2325 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
2326 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
2327 [1.7v]: https://github.com/rust-lang/rust/pull/29973
2328 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
2329 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
2330 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
2331 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
2332 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
2333 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
2334 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
2335 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
2336 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
2337 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
2338 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
2339 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
2340 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
2341 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
2342 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
2343 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
2344 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
2345 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
2346 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
2347 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
2348 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
2349 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
2350 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
2351 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
2352 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
2353 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
2354 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
2355 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
2356 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
2357 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
2358 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
2359 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
2360 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
2361 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
2362 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
2363 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
2364 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
2365 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
2366 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
2367 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
2368 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
2369 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
2370 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
2371 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
2372 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
2373 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
2374 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
2375 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
2376 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
2377 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
2378 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
2379 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
2380 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
2381 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
2382 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
2383 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
2384 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
2385 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
2386 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
2387 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
2390 Version 1.6.0 (2016-01-21)
2391 ==========================
2396 * The `#![no_std]` attribute causes a crate to not be linked to the
2397 standard library, but only the [core library][1.6co], as described
2398 in [RFC 1184]. The core library defines common types and traits but
2399 has no platform dependencies whatsoever, and is the basis for Rust
2400 software in environments that cannot support a full port of the
2401 standard library, such as operating systems. Most of the core
2402 library is now stable.
2408 [`Read::read_exact`],
2409 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
2410 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
2411 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
2412 [`os::unix::fs::DirBuilderExt`],
2413 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
2414 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
2415 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
2416 [`collections::hash_map::Drain`],
2417 [`collections::hash_map::HashMap::drain`],
2418 [`collections::hash_set::Drain`],
2419 [`collections::hash_set::HashSet::drain`],
2420 [`collections::binary_heap::Drain`],
2421 [`collections::binary_heap::BinaryHeap::drain`],
2422 [`Vec::extend_from_slice`][] (renamed from `push_all`),
2423 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
2424 [`RwLock::into_inner`],
2425 [`Iterator::min_by_key`][] (renamed from `min_by`),
2426 [`Iterator::max_by_key`][] (renamed from `max_by`).
2427 * The [core library][1.6co] is stable, as are most of its APIs.
2428 * [The `assert_eq!` macro supports arguments that don't implement
2429 `Sized`][1.6ae], such as arrays. In this way it behaves more like
2431 * Several timer functions that take duration in milliseconds [are
2432 deprecated in favor of those that take `Duration`][1.6ms]. These
2433 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
2434 `thread::park_timeout_ms`.
2435 * The algorithm by which `Vec` reserves additional elements was
2436 [tweaked to not allocate excessive space][1.6a] while still growing
2438 * `From` conversions are [implemented from integers to floats][1.6f]
2439 in cases where the conversion is lossless. Thus they are not
2440 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
2441 or `f64`. They are also not implemented for `isize` and `usize`
2442 because the implementations would be platform-specific. `From` is
2443 also implemented from `f32` to `f64`.
2444 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
2445 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
2446 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
2447 * [`BinaryHeap` was refactored][1.6bh] for modest performance
2449 * Sorting slices that are already sorted [is 50% faster in some
2455 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
2456 * Cargo build scripts can specify their dependencies by emitting the
2457 [`rerun-if-changed`][1.6rr] key.
2458 * crates.io will reject publication of crates with dependencies that
2459 have a wildcard version constraint. Crates with wildcard
2460 dependencies were seen to cause a variety of problems, as described
2461 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
2463 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
2464 release folder. A variety of artifacts that Cargo failed to clean
2465 are now correctly deleted.
2470 * The `unreachable_code` lint [warns when a function call's argument
2472 * The parser indicates [failures that may be caused by
2473 confusingly-similar Unicode characters][1.6uc]
2474 * Certain macro errors [are reported at definition time][1.6m], not
2480 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
2481 environment variable when locating crates. This was a pre-cargo
2482 feature for integrating with the package manager that was
2483 accidentally never removed.
2484 * [A number of bugs were fixed in the privacy checker][1.6p] that
2485 could cause previously-accepted code to break.
2486 * [Modules and unit/tuple structs may not share the same name][1.6ts].
2487 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
2488 struct pattern syntax (`Foo(..)`) can no longer be used to match
2489 unit structs. This is a warning now, but will become an error in
2490 future releases. Patterns that share the same name as a const are
2492 * A bug was fixed that causes [rustc not to apply default type
2493 parameters][1.6xc] when resolving certain method implementations of
2494 traits defined in other crates.
2496 [1.6a]: https://github.com/rust-lang/rust/pull/29454
2497 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
2498 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
2499 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
2500 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
2501 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
2502 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
2503 [1.6f]: https://github.com/rust-lang/rust/pull/29129
2504 [1.6m]: https://github.com/rust-lang/rust/pull/29828
2505 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
2506 [1.6p]: https://github.com/rust-lang/rust/pull/29726
2507 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
2508 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
2509 [1.6s]: https://github.com/rust-lang/rust/pull/29675
2510 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
2511 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
2512 [1.6us]: https://github.com/rust-lang/rust/pull/29383
2513 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
2514 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
2515 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
2516 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
2517 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
2518 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
2519 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
2520 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
2521 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
2522 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
2523 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
2524 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
2525 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
2526 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
2527 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
2528 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
2529 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
2530 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
2531 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
2532 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
2533 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
2534 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
2535 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
2536 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
2537 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
2538 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
2539 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
2540 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
2541 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
2542 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
2545 Version 1.5.0 (2015-12-10)
2546 ==========================
2548 * ~700 changes, numerous bugfixes
2554 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
2555 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
2556 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
2557 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
2558 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
2559 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
2560 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
2561 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
2562 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
2563 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
2564 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
2565 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
2566 [`Path::read_link`], [`Path::symlink_metadata`],
2567 [`Utf8Error::valid_up_to`], [`Vec::resize`],
2568 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
2569 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
2570 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
2571 [`slice::split_first_mut`], [`slice::split_first`],
2572 [`slice::split_last_mut`], [`slice::split_last`],
2573 [`char::from_u32_unchecked`], [`fs::canonicalize`],
2574 [`str::MatchIndices`], [`str::RMatchIndices`],
2575 [`str::match_indices`], [`str::rmatch_indices`],
2576 [`str::slice_mut_unchecked`], [`string::ParseError`].
2577 * Rust applications hosted on crates.io can be installed locally to
2578 `~/.cargo/bin` with the [`cargo install`] command. Among other
2579 things this makes it easier to augment Cargo with new subcommands:
2580 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
2581 invoked as `cargo foo`.
2582 * Crates with wildcard (`*`) dependencies will [emit warnings when
2583 published][1.5w]. In 1.6 it will no longer be possible to publish
2584 crates with wildcard dependencies.
2589 * The rules determining when a particular lifetime must outlive
2590 a particular value (known as '[dropck]') have been [modified
2591 to not rely on parametricity][1.5p].
2592 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
2593 and `Arc`][1.5a]. Because these smart pointer types implement
2594 `Deref`, this causes breakage in cases where the interior type
2595 contains methods of the same name.
2596 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
2597 that they could drop their content. Soundness fix.
2598 * All method invocations are [properly checked][1.5wf1] for
2599 [well-formedness][1.5wf2]. Soundness fix.
2600 * Traits whose supertraits contain `Self` are [not object
2601 safe][1.5o]. Soundness fix.
2602 * Target specifications support a [`no_default_libraries`][1.5nd]
2603 setting that controls whether `-nodefaultlibs` is passed to the
2604 linker, and in turn the `is_like_windows` setting no longer affects
2605 the `-nodefaultlibs` flag.
2606 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
2607 * The `#[inline]` and `#[repr]` attributes [can only appear
2608 in valid locations][1.5at].
2609 * Native libraries linked from the local crate are [passed to
2610 the linker before native libraries from upstream crates][1.5nl].
2611 * Two rarely-used attributes, `#[no_debug]` and
2612 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
2613 * Negation of unsigned integers, which has been a warning for
2614 several releases, [is now behind a feature gate and will
2615 generate errors][1.5nu].
2616 * The parser accidentally accepted visibility modifiers on
2617 enum variants, a bug [which has been fixed][1.5ev].
2618 * [A bug was fixed that allowed `use` statements to import unstable
2624 * When evaluating expressions at compile-time that are not
2625 compile-time constants (const-evaluating expressions in non-const
2626 contexts), incorrect code such as overlong bitshifts and arithmetic
2627 overflow will [generate a warning instead of an error][1.5ce],
2628 delaying the error until runtime. This will allow the
2629 const-evaluator to be expanded in the future backwards-compatibly.
2630 * The `improper_ctypes` lint [no longer warns about using `isize` and
2631 `usize` in FFI][1.5ict].
2636 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
2638 * `Default` is [implemented for mutable slices][1.5d].
2639 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
2640 * There are now `From` conversions [between floating point
2641 types][1.5f] where the conversions are lossless.
2642 * Thera are now `From` conversions [between integer types][1.5i] where
2643 the conversions are lossless.
2644 * [`fs::Metadata` implements `Clone`][1.5fs].
2645 * The `parse` method [accepts a leading "+" when parsing
2647 * [`AsMut` is implemented for `Vec`][1.5am].
2648 * The `clone_from` implementations for `String` and `BinaryHeap` [have
2649 been optimized][1.5cf] and no longer rely on the default impl.
2650 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
2651 `unsafe extern "C"` function types now [implement `Clone`,
2652 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
2653 `fmt::Debug` for up to 12 arguments][1.5fp].
2654 * [Dropping `Vec`s is much faster in unoptimized builds when the
2655 element types don't implement `Drop`][1.5dv].
2656 * A bug that caused in incorrect behavior when [combining `VecDeque`
2657 with zero-sized types][1.5vdz] was resolved.
2658 * [`PartialOrd` for slices is faster][1.5po].
2663 * [Crate metadata size was reduced by 20%][1.5md].
2664 * [Improvements to code generation reduced the size of libcore by 3.3
2665 MB and rustc's memory usage by 18MB][1.5m].
2666 * [Improvements to deref translation increased performance in
2667 unoptimized builds][1.5dr].
2668 * Various errors in trait resolution [are deduplicated to only be
2669 reported once][1.5te].
2670 * Rust has preliminary [support for rumprun kernels][1.5rr].
2671 * Rust has preliminary [support for NetBSD on amd64][1.5na].
2673 [1.5use]: https://github.com/rust-lang/rust/pull/28364
2674 [1.5po]: https://github.com/rust-lang/rust/pull/28436
2675 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
2676 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
2677 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
2678 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
2679 [1.5md]: https://github.com/rust-lang/rust/pull/28521
2680 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
2681 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
2682 [1.5na]: https://github.com/rust-lang/rust/pull/28543
2683 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
2684 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
2685 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
2686 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
2687 [1.5te]: https://github.com/rust-lang/rust/pull/28645
2688 [1.5at]: https://github.com/rust-lang/rust/pull/28650
2689 [1.5am]: https://github.com/rust-lang/rust/pull/28663
2690 [1.5m]: https://github.com/rust-lang/rust/pull/28778
2691 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
2692 [1.5a]: https://github.com/rust-lang/rust/pull/28811
2693 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
2694 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
2695 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
2696 [1.5i]: https://github.com/rust-lang/rust/pull/28921
2697 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
2698 [1.5f]: https://github.com/rust-lang/rust/pull/29129
2699 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
2700 [1.5s]: https://github.com/rust-lang/rust/pull/29190
2701 [1.5d]: https://github.com/rust-lang/rust/pull/29245
2702 [1.5o]: https://github.com/rust-lang/rust/pull/29259
2703 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
2704 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
2705 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
2706 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
2707 [1.5c]: https://github.com/rust-lang/rust/pull/29110
2708 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
2709 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
2710 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
2711 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
2712 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
2713 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
2714 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
2715 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
2716 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
2717 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
2718 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
2719 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
2720 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
2721 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
2722 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
2723 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
2724 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
2725 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
2726 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
2727 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
2728 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
2729 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
2730 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
2731 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
2732 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
2733 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
2734 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
2735 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
2736 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
2737 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
2738 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
2739 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
2740 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
2741 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
2742 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
2743 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
2744 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
2745 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
2746 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
2747 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
2748 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
2749 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
2750 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
2751 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
2752 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
2753 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
2754 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
2755 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
2756 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
2757 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
2758 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
2759 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
2760 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
2761 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
2763 Version 1.4.0 (2015-10-29)
2764 ==========================
2766 * ~1200 changes, numerous bugfixes
2771 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
2772 GNU) are now supported and recommended for use.
2777 * [Several changes have been made to fix type soundness and improve
2778 the behavior of associated types][sound]. See [RFC 1214]. Although
2779 we have mostly introduced these changes as warnings this release, to
2780 become errors next release, there are still some scenarios that will
2781 see immediate breakage.
2782 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
2783 line breaks in addition to `\n`][crlf].
2784 * [Loans of `'static` lifetime extend to the end of a function][stat].
2785 * [`str::parse` no longer introduces avoidable rounding error when
2786 parsing floating point numbers. Together with earlier changes to
2787 float formatting/output, "round trips" like f.to_string().parse()
2788 now preserve the value of f exactly. Additionally, leading plus
2789 signs are now accepted][fp3].
2795 * `use` statements that import multiple items [can now rename
2796 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
2797 * [Binops work correctly on fat pointers][binfat].
2798 * `pub extern crate`, which does not behave as expected, [issues a
2799 warning][pec] until a better solution is found.
2804 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
2805 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
2806 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
2807 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
2808 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
2809 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
2810 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
2811 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
2812 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
2813 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
2814 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
2815 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
2816 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
2817 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
2818 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
2819 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
2820 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
2821 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
2823 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
2824 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
2825 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
2826 `f64::from_str_radix`.
2827 * [Reverse-searching strings is faster with the 'two-way'
2829 * [`std::io::copy` allows `?Sized` arguments][cc].
2830 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
2831 [override `count`, `nth` and `last` with an O(1)
2832 implementation][it].
2833 * [`Default` is implemented for arrays up to `[T; 32]`][d].
2834 * [`IntoRawFd` has been added to the Unix-specific prelude,
2835 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
2837 * [`Extend<String>` and `FromIterator<String` are both implemented for
2839 * [`IntoIterator` is implemented for references to `Option` and
2841 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
2842 Copy`][ext] as part of [RFC 839]. This will cause type inferance
2843 breakage in rare situations.
2844 * [`BinaryHeap` implements `Debug`][bh2].
2845 * [`Borrow` and `BorrowMut` are implemented for fixed-size
2847 * [`extern fn`s with the "Rust" and "C" ABIs implement common
2848 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
2849 * [String comparison is faster][faststr].
2850 * `&mut T` where `T: std::fmt::Write` [also implements
2851 `std::fmt::Write`][mutw].
2852 * [A stable regression in `VecDeque::push_back` and other
2853 capicity-altering methods that caused panics for zero-sized types
2855 * [Function pointers implement traits for up to 12 parameters][fp2].
2860 * The compiler [no longer uses the 'morestack' feature to prevent
2861 stack overflow][mm]. Instead it uses guard pages and stack
2862 probes (though stack probes are not yet implemented on any platform
2864 * [The compiler matches traits faster when projections are involved][p].
2865 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
2867 * [Cargo now displays useful information about what its doing during
2868 `cargo update`][cu].
2870 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
2871 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
2872 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
2873 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
2874 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
2875 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
2876 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
2877 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
2878 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
2879 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
2880 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
2881 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
2882 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
2883 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
2884 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
2885 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
2886 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
2887 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
2888 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
2889 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
2890 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
2891 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
2892 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
2893 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
2894 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
2895 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
2896 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
2897 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
2898 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
2899 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
2900 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
2901 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
2902 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
2903 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
2904 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
2905 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
2906 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
2907 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
2908 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
2909 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
2910 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
2911 [bh2]: https://github.com/rust-lang/rust/pull/28156
2912 [binfat]: https://github.com/rust-lang/rust/pull/28270
2913 [bm]: https://github.com/rust-lang/rust/pull/28197
2914 [cc]: https://github.com/rust-lang/rust/pull/27531
2915 [crlf]: https://github.com/rust-lang/rust/pull/28034
2916 [cu]: https://github.com/rust-lang/cargo/pull/1931
2917 [d]: https://github.com/rust-lang/rust/pull/27825
2918 [dep]: https://github.com/rust-lang/rust/pull/28339
2919 [es]: https://github.com/rust-lang/rust/pull/27956
2920 [ext]: https://github.com/rust-lang/rust/pull/28094
2921 [faststr]: https://github.com/rust-lang/rust/pull/28338
2922 [ffi]: https://github.com/rust-lang/rust/pull/28779
2923 [fp]: https://github.com/rust-lang/rust/pull/28268
2924 [fp2]: https://github.com/rust-lang/rust/pull/28560
2925 [fp3]: https://github.com/rust-lang/rust/pull/27307
2926 [i]: https://github.com/rust-lang/rust/pull/27451
2927 [into2]: https://github.com/rust-lang/rust/pull/28039
2928 [it]: https://github.com/rust-lang/rust/pull/27652
2929 [mm]: https://github.com/rust-lang/rust/pull/27338
2930 [mutw]: https://github.com/rust-lang/rust/pull/28368
2931 [sound]: https://github.com/rust-lang/rust/pull/27641
2932 [p]: https://github.com/rust-lang/rust/pull/27866
2933 [pec]: https://github.com/rust-lang/rust/pull/28486
2934 [pr]: https://github.com/rust-lang/rust/pull/27896
2935 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
2936 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
2937 [s]: https://github.com/rust-lang/rust/pull/27474
2938 [stab]: https://github.com/rust-lang/rust/pull/28339
2939 [stat]: https://github.com/rust-lang/rust/pull/28321
2940 [vd]: https://github.com/rust-lang/rust/pull/28494
2942 Version 1.3.0 (2015-09-17)
2943 ==============================
2945 * ~900 changes, numerous bugfixes
2950 * The [new object lifetime defaults][nold] have been [turned
2951 on][nold2] after a cycle of warnings about the change. Now types
2952 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
2953 being interpreted as `&'a Box<Trait+'a>` to `&'a
2954 Box<Trait+'static>`.
2955 * [The Rustonomicon][nom] is a new book in the official documentation
2956 that dives into writing unsafe Rust.
2957 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
2958 timekeeping is employed by other std APIs, as well as out-of-tree
2964 * The [new object lifetime defaults][nold] have been [turned
2965 on][nold2] after a cycle of warnings about the change.
2966 * There is a known [regression][lr] in how object lifetime elision is
2967 interpreted, the proper solution for which is undetermined.
2968 * The `#[prelude_import]` attribute, an internal implementation
2969 detail, was accidentally stabilized previously. [It has been put
2970 behind the `prelude_import` feature gate][pi]. This change is
2971 believed to break no existing code.
2972 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
2973 [more sane for dynamically sized types][dst3]. Code that relied on
2974 the previous behavior is thought to be broken.
2975 * The `dropck` rules, which checks that destructors can't access
2976 destroyed values, [have been updated][dropck] to match the
2977 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
2978 cause some previously-compiling code to no longer build.
2983 * The [new object lifetime defaults][nold] have been [turned
2984 on][nold2] after a cycle of warnings about the change.
2985 * Semicolons may [now follow types and paths in
2986 macros](https://github.com/rust-lang/rust/pull/27000).
2987 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
2988 [more sane for dynamically sized types][dst3]. Code that relied on
2989 the previous behavior is not known to exist, and suspected to be
2991 * `'static` variables [may now be recursive][st].
2992 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
2993 implementations correctly.
2994 * The `dropck` rules, which checks that destructors can't access
2995 destroyed values, [have been updated][dropck] to match the
3001 * The [`Duration`] API, [has been stabilized][ds], as well as the
3002 `std::time` module, which presently contains only `Duration`.
3003 * `Box<str>` and `Box<[T]>` both implement `Clone`.
3004 * The owned C string, [`CString`], implements [`Borrow`] and the
3005 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
3006 these allow C strings to be borrowed and cloned in generic code.
3007 * [`CStr`] implements [`Debug`].
3008 * [`AtomicPtr`] implements [`Debug`].
3009 * [`Error`] trait objects [can be downcast to their concrete types][e]
3010 in many common configurations, using the [`is`], [`downcast`],
3011 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
3013 * Searching for substrings now [employs the two-way algorithm][search]
3014 instead of doing a naive search. This gives major speedups to a
3015 number of methods, including [`contains`][sc], [`find`][sf],
3016 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
3017 [`ends_with`][sew] are also faster.
3018 * The performance of `PartialEq` for slices is [much faster][ps].
3019 * The [`Hash`] trait offers the default method, [`hash_slice`], which
3020 is overridden and optimized by the implementations for scalars.
3021 * The [`Hasher`] trait now has a number of specialized `write_*`
3022 methods for primitive types, for efficiency.
3023 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
3024 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
3025 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
3026 of [`std::error::Error::cause`][iec] also delegates to the inner
3028 * [`process::Child`][pc] gained the [`id`] method, which returns a
3029 `u32` representing the platform-specific process identifier.
3030 * The [`connect`] method on slices is deprecated, replaced by the new
3031 [`join`] method (note that both of these are on the *unstable*
3032 [`SliceConcatExt`] trait, but through the magic of the prelude are
3033 available to stable code anyway).
3034 * The [`Div`] operator is implemented for [`Wrapping`] types.
3035 * [`DerefMut` is implemented for `String`][dms].
3036 * Performance of SipHash (the default hasher for `HashMap`) is
3037 [better for long data][sh].
3038 * [`AtomicPtr`] implements [`Send`].
3039 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
3040 are now [specialized to use uninitalized buffers for increased
3042 * Lifetime parameters of foreign functions [are now resolved
3048 * Rust can now, with some coercion, [produce programs that run on
3049 Windows XP][xp], though XP is not considered a supported platform.
3050 * Porting Rust on Windows from the GNU toolchain to MSVC continues
3051 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
3052 recommended for use in 1.3, though should be fully-functional
3053 in the [64-bit 1.4 beta][b14].
3054 * On Fedora-based systems installation will [properly configure the
3055 dynamic linker][fl].
3056 * The compiler gained many new extended error descriptions, which can
3057 be accessed with the `--explain` flag.
3058 * The `dropck` pass, which checks that destructors can't access
3059 destroyed values, [has been rewritten][dropck]. This fixes some
3060 soundness holes, and as such will cause some previously-compiling
3061 code to no longer build.
3062 * `rustc` now uses [LLVM to write archive files where possible][ar].
3063 Eventually this will eliminate the compiler's dependency on the ar
3065 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
3066 supported FreeBSD on x86_64).
3067 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
3068 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
3070 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
3071 will kill the process instead of leaking][nlp].
3073 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
3074 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
3075 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
3076 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
3077 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
3078 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
3079 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
3080 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
3081 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
3082 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
3083 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
3084 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
3085 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
3086 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3087 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
3088 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
3089 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
3090 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
3091 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
3092 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
3093 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
3094 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
3095 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
3096 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
3097 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
3098 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
3099 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
3100 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
3101 [ar]: https://github.com/rust-lang/rust/pull/26926
3102 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
3103 [dms]: https://github.com/rust-lang/rust/pull/26241
3104 [dropck]: https://github.com/rust-lang/rust/pull/27261
3105 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
3106 [ds]: https://github.com/rust-lang/rust/pull/26818
3107 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
3108 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
3109 [dst3]: https://github.com/rust-lang/rust/pull/27351
3110 [e]: https://github.com/rust-lang/rust/pull/24793
3111 [f]: https://github.com/rust-lang/rust/pull/26588
3112 [fb]: https://github.com/rust-lang/rust/pull/26959
3113 [fl]: https://github.com/rust-lang/rust-installer/pull/41
3114 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
3115 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
3116 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
3117 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
3118 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
3119 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
3120 [lic]: https://github.com/rust-lang/rust/pull/26583
3121 [lnu]: https://github.com/rust-lang/rust/pull/27026
3122 [lr]: https://github.com/rust-lang/rust/issues/27248
3123 [lum]: https://github.com/rust-lang/rust/pull/26378
3124 [lur]: https://github.com/rust-lang/rust/pull/26783
3125 [nlp]: https://github.com/rust-lang/rust/pull/27176
3126 [nold2]: https://github.com/rust-lang/rust/pull/27045
3127 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
3128 [nom]: http://doc.rust-lang.org/nightly/nomicon/
3129 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
3130 [pi]: https://github.com/rust-lang/rust/pull/26699
3131 [ps]: https://github.com/rust-lang/rust/pull/26884
3132 [rte]: https://github.com/rust-lang/rust/pull/26950
3133 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
3134 [search]: https://github.com/rust-lang/rust/pull/26327
3135 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
3136 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
3137 [sh]: https://github.com/rust-lang/rust/pull/27280
3138 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
3139 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
3140 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
3141 [st]: https://github.com/rust-lang/rust/pull/26630
3142 [win1]: https://github.com/rust-lang/rust/pull/26569
3143 [win2]: https://github.com/rust-lang/rust/pull/26741
3144 [win3]: https://github.com/rust-lang/rust/pull/26741
3145 [win4]: https://github.com/rust-lang/rust/pull/27210
3146 [xp]: https://github.com/rust-lang/rust/pull/26569
3148 Version 1.2.0 (2015-08-07)
3149 ==========================
3151 * ~1200 changes, numerous bugfixes
3156 * [Dynamically-sized-type coercions][dst] allow smart pointer types
3157 like `Rc` to contain types without a fixed size, arrays and trait
3158 objects, finally enabling use of `Rc<[T]>` and completing the
3159 implementation of DST.
3160 * [Parallel codegen][parcodegen] is now working again, which can
3161 substantially speed up large builds in debug mode; It also gets
3162 another ~33% speedup when bootstrapping on a 4 core machine (using 8
3163 jobs). It's not enabled by default, but will be "in the near
3164 future". It can be activated with the `-C codegen-units=N` flag to
3166 * This is the first release with [experimental support for linking
3167 with the MSVC linker and lib C on Windows (instead of using the GNU
3168 variants via MinGW)][win]. It is yet recommended only for the most
3169 intrepid Rusticians.
3170 * Benchmark compilations are showing a 30% improvement in
3171 bootstrapping over 1.1.
3176 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
3177 unicode case mapping, which is a previously-planned change in
3178 behavior and considered a bugfix.
3179 * [`mem::align_of`] now specifies [the *minimum alignment* for
3180 T][align], which is usually the alignment programs are interested
3181 in, and the same value reported by clang's
3182 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
3184 * [The `#[packed]` attribute is no longer silently accepted by the
3185 compiler][packed]. This attribute did nothing and code that
3186 mentioned it likely did not work as intended.
3187 * Associated type defaults are [now behind the
3188 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
3189 defaults *did not work*, but could be mentioned syntactically. As
3190 such this breakage has minimal impact.
3195 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
3196 matching against dereferencable values.
3201 * The [`Extend`] trait, which grows a collection from an iterator, is
3202 implemented over iterators of references, for `String`, `Vec`,
3203 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
3204 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
3205 * The [`iter::once`] function returns an iterator that yields a single
3206 element, and [`iter::empty`] returns an iterator that yields no
3208 * The [`matches`] and [`rmatches`] methods on `str` return iterators
3209 over substring matches.
3210 * [`Cell`] and [`RefCell`] both implement `Eq`.
3211 * A number of methods for wrapping arithmetic are added to the
3212 integral types, [`wrapping_div`], [`wrapping_rem`],
3213 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
3214 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
3215 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
3216 type.. It is illegal for the default arithmetic operations in Rust
3217 to overflow; the desire to wrap must be explicit.
3218 * The `{:#?}` formatting specifier [displays the alternate,
3219 pretty-printed][debugfmt] form of the `Debug` formatter. This
3220 feature was actually introduced prior to 1.0 with little
3222 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
3223 for writing data to formatted strings, similar to [`io::Write`].
3224 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
3225 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
3226 are used by code generators to emit implementations of [`Debug`].
3227 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
3228 methods that convert case, following Unicode case mapping.
3229 * It is now easier to handle poisoned locks. The [`PoisonError`]
3230 type, returned by failing lock operations, exposes `into_inner`,
3231 `get_ref`, and `get_mut`, which all give access to the inner lock
3232 guard, and allow the poisoned lock to continue to operate. The
3233 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
3234 poisoned lock without attempting to take the lock.
3235 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
3236 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
3237 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
3238 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
3240 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
3246 * `rustc` employs smarter heuristics for guessing at [typos].
3247 * `rustc` emits more efficient code for [no-op conversions between
3248 unsafe pointers][nop].
3249 * Fat pointers are now [passed in pairs of immediate arguments][fat],
3250 resulting in faster compile times and smaller code.
3252 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
3253 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
3254 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
3255 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
3256 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
3257 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
3258 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
3259 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
3260 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
3261 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
3262 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
3263 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
3264 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
3265 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
3266 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
3267 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
3268 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
3269 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
3270 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
3271 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
3272 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
3273 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
3274 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
3275 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
3276 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
3277 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
3278 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
3279 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
3280 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
3281 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
3282 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
3283 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
3284 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
3285 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
3286 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
3287 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
3288 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
3289 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
3290 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
3291 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
3292 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
3293 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
3294 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
3295 [align]: https://github.com/rust-lang/rust/pull/25646
3296 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
3297 [typos]: https://github.com/rust-lang/rust/pull/26087
3298 [nop]: https://github.com/rust-lang/rust/pull/26336
3299 [fat]: https://github.com/rust-lang/rust/pull/26411
3300 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
3301 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
3302 [packed]: https://github.com/rust-lang/rust/pull/25541
3303 [ad]: https://github.com/rust-lang/rust/pull/27382
3304 [win]: https://github.com/rust-lang/rust/pull/25350
3306 Version 1.1.0 (2015-06-25)
3307 =========================
3309 * ~850 changes, numerous bugfixes
3314 * The [`std::fs` module has been expanded][fs] to expand the set of
3315 functionality exposed:
3316 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
3317 don't incur a syscall on some platforms.
3318 * A `symlink_metadata` function has been added.
3319 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
3320 access to all underlying information.
3321 * The compiler now contains extended explanations of many errors. When an error
3322 with an explanation occurs the compiler suggests using the `--explain` flag
3323 to read the explanation. Error explanations are also [available online][err-index].
3324 * Thanks to multiple [improvements][sk] to [type checking][pre], as
3325 well as other work, the time to bootstrap the compiler decreased by
3331 * The [`str::split_whitespace`] method splits a string on unicode
3332 whitespace boundaries.
3333 * On both Windows and Unix, new extension traits provide conversion of
3334 I/O types to and from the underlying system handles. On Unix, these
3335 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
3336 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
3337 `TcpListener`, and `UpdSocket`. Further implementations for
3338 `std::process` will be stabilized later.
3339 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
3340 Windows, symlinks can be created with
3341 `std::os::windows::symlink_dir` and
3342 `std::os::windows::symlink_file`.
3343 * The `mpsc::Receiver` type can now be converted into an iterator with
3344 `into_iter` on the [`IntoIterator`] trait.
3345 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
3346 implementation of the [`From`] trait.
3347 * The `Debug` implementation for `RangeFull` [creates output that is
3348 more consistent with other implementations][rf].
3349 * [`Debug` is implemented for `File`][file].
3350 * The `Default` implementation for `Arc` [no longer requires `Sync +
3352 * [The `Iterator` methods `count`, `nth`, and `last` have been
3353 overridden for slices to have O(1) performance instead of O(n)][si].
3354 * Incorrect handling of paths on Windows has been improved in both the
3355 compiler and the standard library.
3356 * [`AtomicPtr` gained a `Default` implementation][ap].
3357 * In accordance with Rust's policy on arithmetic overflow `abs` now
3358 [panics on overflow when debug assertions are enabled][abs].
3359 * The [`Cloned`] iterator, which was accidentally left unstable for
3360 1.0 [has been stabilized][c].
3361 * The [`Incoming`] iterator, which iterates over incoming TCP
3362 connections, and which was accidentally unnamable in 1.0, [is now
3363 properly exported][inc].
3364 * [`BinaryHeap`] no longer corrupts itself [when functions called by
3365 `sift_up` or `sift_down` panic][bh].
3366 * The [`split_off`] method of `LinkedList` [no longer corrupts
3367 the list in certain scenarios][ll].
3372 * Type checking performance [has improved notably][sk] with
3373 [multiple improvements][pre].
3374 * The compiler [suggests code changes][ch] for more errors.
3375 * rustc and it's build system have experimental support for [building
3376 toolchains against MUSL][m] instead of glibc on Linux.
3377 * The compiler defines the `target_env` cfg value, which is used for
3378 distinguishing toolchains that are otherwise for the same
3379 platform. Presently this is set to `gnu` for common GNU Linux
3380 targets and for MinGW targets, and `musl` for MUSL Linux targets.
3381 * The [`cargo rustc`][crc] command invokes a build with custom flags
3383 * [Android executables are always position independent][pie].
3384 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
3387 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
3388 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
3389 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
3390 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
3391 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
3392 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
3393 [rf]: https://github.com/rust-lang/rust/pull/24491
3394 [err-index]: https://doc.rust-lang.org/error-index.html
3395 [sk]: https://github.com/rust-lang/rust/pull/24615
3396 [pre]: https://github.com/rust-lang/rust/pull/25323
3397 [file]: https://github.com/rust-lang/rust/pull/24598
3398 [ch]: https://github.com/rust-lang/rust/pull/24683
3399 [arc]: https://github.com/rust-lang/rust/pull/24695
3400 [si]: https://github.com/rust-lang/rust/pull/24701
3401 [ap]: https://github.com/rust-lang/rust/pull/24834
3402 [m]: https://github.com/rust-lang/rust/pull/24777
3403 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
3404 [crc]: https://github.com/rust-lang/cargo/pull/1568
3405 [pie]: https://github.com/rust-lang/rust/pull/24953
3406 [abs]: https://github.com/rust-lang/rust/pull/25441
3407 [c]: https://github.com/rust-lang/rust/pull/25496
3408 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
3409 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
3410 [inc]: https://github.com/rust-lang/rust/pull/25522
3411 [bh]: https://github.com/rust-lang/rust/pull/25856
3412 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
3413 [ll]: https://github.com/rust-lang/rust/pull/26022
3414 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
3415 [drop]: https://github.com/rust-lang/rust/pull/24935
3417 Version 1.0.0 (2015-05-15)
3418 ========================
3420 * ~1500 changes, numerous bugfixes
3425 * The vast majority of the standard library is now `#[stable]`. It is
3426 no longer possible to use unstable features with a stable build of
3428 * Many popular crates on [crates.io] now work on the stable release
3430 * Arithmetic on basic integer types now [checks for overflow in debug
3436 * Several [restrictions have been added to trait coherence][coh] in
3437 order to make it easier for upstream authors to change traits
3438 without breaking downstream code.
3439 * Digits of binary and octal literals are [lexed more eagerly][lex] to
3440 improve error messages and macro behavior. For example, `0b1234` is
3441 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
3442 * Trait bounds [are always invariant][inv], eliminating the need for
3443 the `PhantomFn` and `MarkerTrait` lang items, which have been
3445 * ["-" is no longer a valid character in crate names][cr], the `extern crate
3446 "foo" as bar` syntax has been replaced with `extern crate foo as
3447 bar`, and Cargo now automatically translates "-" in *package* names
3448 to underscore for the crate name.
3449 * [Lifetime shadowing is an error][lt].
3450 * [`Send` no longer implies `'static`][send-rfc].
3451 * [UFCS now supports trait-less associated paths][moar-ufcs] like
3452 `MyType::default()`.
3453 * Primitive types [now have inherent methods][prim-inherent],
3454 obviating the need for extension traits like `SliceExt`.
3455 * Methods with `Self: Sized` in their `where` clause are [considered
3456 object-safe][self-sized], allowing many extension traits like
3457 `IteratorExt` to be merged into the traits they extended.
3458 * You can now [refer to associated types][assoc-where] whose
3459 corresponding trait bounds appear only in a `where` clause.
3460 * The final bits of [OIBIT landed][oibit-final], meaning that traits
3461 like `Send` and `Sync` are now library-defined.
3462 * A [Reflect trait][reflect] was introduced, which means that
3463 downcasting via the `Any` trait is effectively limited to concrete
3464 types. This helps retain the potentially-important "parametricity"
3465 property: generic code cannot behave differently for different type
3466 arguments except in minor ways.
3467 * The `unsafe_destructor` feature is now deprecated in favor of the
3468 [new `dropck`][dropck]. This change is a major reduction in unsafe
3474 * The `thread_local` module [has been renamed to `std::thread`][th].
3475 * The methods of `IteratorExt` [have been moved to the `Iterator`
3477 * Several traits that implement Rust's conventions for type
3478 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
3479 [centralized in the `std::convert` module][con].
3480 * The `FromError` trait [was removed in favor of `From`][fe].
3481 * The basic sleep function [has moved to
3482 `std::thread::sleep_ms`][slp].
3483 * The `splitn` function now takes an `n` parameter that represents the
3484 number of items yielded by the returned iterator [instead of the
3485 number of 'splits'][spl].
3486 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
3487 * [Derived implementations of `PartialOrd` now order enums according
3488 to their explicitly-assigned discriminants][po].
3489 * [Methods for searching strings are generic over `Pattern`s][pat],
3490 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
3492 * [In method resolution, object methods are resolved before inherent
3494 * [`String::from_str` has been deprecated in favor of the `From` impl,
3495 `String::from`][sf].
3496 * [`io::Error` implements `Sync`][ios].
3497 * [The `words` method on `&str` has been replaced with
3498 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
3500 * The new path and IO modules are complete and `#[stable]`. This
3501 was the major library focus for this cycle.
3502 * The path API was [revised][path-normalize] to normalize `.`,
3503 adjusting the tradeoffs in favor of the most common usage.
3504 * A large number of remaining APIs in `std` were also stabilized
3505 during this cycle; about 75% of the non-deprecated API surface
3507 * The new [string pattern API][string-pattern] landed, which makes
3508 the string slice API much more internally consistent and flexible.
3509 * A new set of [generic conversion traits][conversion] replaced
3510 many existing ad hoc traits.
3511 * Generic numeric traits were [completely removed][num-traits]. This
3512 was made possible thanks to inherent methods for primitive types,
3513 and the removal gives maximal flexibility for designing a numeric
3514 hierarchy in the future.
3515 * The `Fn` traits are now related via [inheritance][fn-inherit]
3516 and provide ergonomic [blanket implementations][fn-blanket].
3517 * The `Index` and `IndexMut` traits were changed to
3518 [take the index by value][index-value], enabling code like
3519 `hash_map["string"]` to work.
3520 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
3521 `Copy` data is known to be `Clone` as well.
3526 * Many errors now have extended explanations that can be accessed with
3527 the `--explain` flag to `rustc`.
3528 * Many new examples have been added to the standard library
3530 * rustdoc has received a number of improvements focused on completion
3532 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
3533 * Much headway was made on ecosystem-wide CI, making it possible
3534 to [compare builds for breakage][ci-compare].
3537 [crates.io]: http://crates.io
3538 [clo]: https://github.com/rust-lang/rust/pull/24034
3539 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
3540 [con]: https://github.com/rust-lang/rust/pull/23875
3541 [cr]: https://github.com/rust-lang/rust/pull/23419
3542 [fe]: https://github.com/rust-lang/rust/pull/23879
3543 [ie]: https://github.com/rust-lang/rust/pull/23300
3544 [inv]: https://github.com/rust-lang/rust/pull/23938
3545 [ios]: https://github.com/rust-lang/rust/pull/24133
3546 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
3547 [lt]: https://github.com/rust-lang/rust/pull/24057
3548 [meth]: https://github.com/rust-lang/rust/pull/24056
3549 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
3550 [po]: https://github.com/rust-lang/rust/pull/24270
3551 [sf]: https://github.com/rust-lang/rust/pull/24517
3552 [slp]: https://github.com/rust-lang/rust/pull/23949
3553 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
3554 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
3555 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
3556 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
3557 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
3558 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
3559 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
3560 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
3561 [self-sized]: https://github.com/rust-lang/rust/pull/22301
3562 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
3563 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
3564 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
3565 [reflect]: https://github.com/rust-lang/rust/pull/23712
3566 [conversion]: https://github.com/rust-lang/rfcs/pull/529
3567 [num-traits]: https://github.com/rust-lang/rust/pull/23549
3568 [index-value]: https://github.com/rust-lang/rust/pull/23601
3569 [dropck]: https://github.com/rust-lang/rfcs/pull/769
3570 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
3571 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
3572 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
3573 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
3574 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
3577 Version 1.0.0-alpha.2 (2015-02-20)
3578 =====================================
3580 * ~1300 changes, numerous bugfixes
3584 * The various I/O modules were [overhauled][io-rfc] to reduce
3585 unnecessary abstractions and provide better interoperation with
3586 the underlying platform. The old `io` module remains temporarily
3588 * The standard library now [participates in feature gating][feat],
3589 so use of unstable libraries now requires a `#![feature(...)]`
3590 attribute. The impact of this change is [described on the
3591 forum][feat-forum]. [RFC][feat-rfc].
3595 * `for` loops [now operate on the `IntoIterator` trait][into],
3596 which eliminates the need to call `.iter()`, etc. to iterate
3597 over collections. There are some new subtleties to remember
3598 though regarding what sort of iterators various types yield, in
3599 particular that `for foo in bar { }` yields values from a move
3600 iterator, destroying the original collection. [RFC][into-rfc].
3601 * Objects now have [default lifetime bounds][obj], so you don't
3602 have to write `Box<Trait+'static>` when you don't care about
3603 storing references. [RFC][obj-rfc].
3604 * In types that implement `Drop`, [lifetimes must outlive the
3605 value][drop]. This will soon make it possible to safely
3606 implement `Drop` for types where `#[unsafe_destructor]` is now
3607 required. Read the [gorgeous RFC][drop-rfc] for details.
3608 * The fully qualified <T as Trait>::X syntax lets you set the Self
3609 type for a trait method or associated type. [RFC][ufcs-rfc].
3610 * References to types that implement `Deref<U>` now [automatically
3611 coerce to references][deref] to the dereferenced type `U`,
3612 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
3613 should eliminate many unsightly uses of `&*`, as when converting
3614 from references to vectors into references to
3615 slices. [RFC][deref-rfc].
3616 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
3617 `|:|`) is obsolete and closure kind is inferred from context.
3618 * [`Self` is a keyword][Self].
3622 * The `Show` and `String` formatting traits [have been
3623 renamed][fmt] to `Debug` and `Display` to more clearly reflect
3624 their related purposes. Automatically getting a string
3625 conversion to use with `format!("{:?}", something_to_debug)` is
3626 now written `#[derive(Debug)]`.
3627 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
3628 OsStr}`, provide strings in platform-specific encodings for easier
3629 interop with system APIs. [RFC][osstr-rfc].
3630 * The `boxed::into_raw` and `Box::from_raw` functions [convert
3631 between `Box<T>` and `*mut T`][boxraw], a common pattern for
3632 creating raw pointers.
3636 * Certain long error messages of the form 'expected foo found bar'
3637 are now [split neatly across multiple
3638 lines][multiline]. Examples in the PR.
3639 * On Unix Rust can be [uninstalled][un] by running
3640 `/usr/local/lib/rustlib/uninstall.sh`.
3641 * The `#[rustc_on_unimplemented]` attribute, requiring the
3642 'on_unimplemented' feature, lets rustc [display custom error
3643 messages when a trait is expected to be implemented for a type
3648 * Rust is tested against a [LALR grammar][lalr], which parses
3649 almost all the Rust files that rustc does.
3651 [boxraw]: https://github.com/rust-lang/rust/pull/21318
3652 [close]: https://github.com/rust-lang/rust/pull/21843
3653 [deref]: https://github.com/rust-lang/rust/pull/21351
3654 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
3655 [drop]: https://github.com/rust-lang/rust/pull/21972
3656 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
3657 [feat]: https://github.com/rust-lang/rust/pull/21248
3658 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
3659 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
3660 [fmt]: https://github.com/rust-lang/rust/pull/21457
3661 [into]: https://github.com/rust-lang/rust/pull/20790
3662 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
3663 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
3664 [lalr]: https://github.com/rust-lang/rust/pull/21452
3665 [multiline]: https://github.com/rust-lang/rust/pull/19870
3666 [obj]: https://github.com/rust-lang/rust/pull/22230
3667 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
3668 [onun]: https://github.com/rust-lang/rust/pull/20889
3669 [osstr]: https://github.com/rust-lang/rust/pull/21488
3670 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
3671 [Self]: https://github.com/rust-lang/rust/pull/22158
3672 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
3673 [un]: https://github.com/rust-lang/rust/pull/22256
3676 Version 1.0.0-alpha (2015-01-09)
3677 ==================================
3679 * ~2400 changes, numerous bugfixes
3683 * The language itself is considered feature complete for 1.0,
3684 though there will be many usability improvements and bugfixes
3685 before the final release.
3686 * Nearly 50% of the public API surface of the standard library has
3687 been declared 'stable'. Those interfaces are unlikely to change
3689 * The long-running debate over integer types has been
3690 [settled][ints]: Rust will ship with types named `isize` and
3691 `usize`, rather than `int` and `uint`, for pointer-sized
3692 integers. Guidelines will be rolled out during the alpha cycle.
3693 * Most crates that are not `std` have been moved out of the Rust
3694 distribution into the Cargo ecosystem so they can evolve
3695 separately and don't need to be stabilized as quickly, including
3696 'time', 'getopts', 'num', 'regex', and 'term'.
3697 * Documentation continues to be expanded with more API coverage, more
3698 examples, and more in-depth explanations. The guides have been
3699 consolidated into [The Rust Programming Language][trpl].
3700 * "[Rust By Example][rbe]" is now maintained by the Rust team.
3701 * All official Rust binary installers now come with [Cargo], the
3702 Rust package manager.
3706 * Closures have been [completely redesigned][unboxed] to be
3707 implemented in terms of traits, can now be used as generic type
3708 bounds and thus monomorphized and inlined, or via an opaque
3709 pointer (boxed) as in the old system. The new system is often
3710 referred to as 'unboxed' closures.
3711 * Traits now support [associated types][assoc], allowing families
3712 of related types to be defined together and used generically in
3714 * Enum variants are [namespaced by their type names][enum].
3715 * [`where` clauses][where] provide a more versatile and attractive
3716 syntax for specifying generic bounds, though the previous syntax
3718 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
3720 * Rust [no longer has a runtime][rt] of any description, and only
3721 supports OS threads, not green threads.
3722 * At long last, Rust has been overhauled for 'dynamically-sized
3723 types' ([DST]), which integrates 'fat pointers' (object types,
3724 arrays, and `str`) more deeply into the type system, making it
3726 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
3727 `..j` that produce range types and which, when combined with the
3728 `Index` operator and multidispatch, leads to a convenient slice
3730 * The new range syntax revealed an ambiguity in the fixed-length
3731 array syntax, so now fixed length arrays [are written `[T;
3733 * The `Copy` trait is no longer implemented automatically. Unsafe
3734 pointers no longer implement `Sync` and `Send` so types
3735 containing them don't automatically either. `Sync` and `Send`
3736 are now 'unsafe traits' so one can "forcibly" implement them via
3737 `unsafe impl` if a type confirms to the requirements for them
3738 even though the internals do not (e.g. structs containing unsafe
3739 pointers like `Arc`). These changes are intended to prevent some
3740 footguns and are collectively known as [opt-in built-in
3741 traits][oibit] (though `Sync` and `Send` will soon become pure
3742 library types unknown to the compiler).
3743 * Operator traits now take their operands [by value][ops], and
3744 comparison traits can use multidispatch to compare one type
3745 against multiple other types, allowing e.g. `String` to be
3746 compared with `&str`.
3747 * `if let` and `while let` are no longer feature-gated.
3748 * Rust has adopted a more [uniform syntax for escaping unicode
3749 characters][unicode].
3750 * `macro_rules!` [has been declared stable][mac]. Though it is a
3751 flawed system it is sufficiently popular that it must be usable
3752 for 1.0. Effort has gone into [future-proofing][mac-future] it
3753 in ways that will allow other macro systems to be developed in
3754 parallel, and won't otherwise impact the evolution of the
3756 * The prelude has been [pared back significantly][prelude] such
3757 that it is the minimum necessary to support the most pervasive
3758 code patterns, and through [generalized where clauses][where]
3759 many of the prelude extension traits have been consolidated.
3760 * Rust's rudimentary reflection [has been removed][refl], as it
3761 incurred too much code generation for little benefit.
3762 * [Struct variants][structvars] are no longer feature-gated.
3763 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
3764 known as 'higher-ranked trait bounds', this crucially allows
3765 unboxed closures to work.
3766 * Macros invocations surrounded by parens or square brackets and
3767 not terminated by a semicolon are [parsed as
3768 expressions][macros], which makes expressions like `vec![1i32,
3769 2, 3].len()` work as expected.
3770 * Trait objects now implement their traits automatically, and
3771 traits that can be coerced to objects now must be [object
3773 * Automatically deriving traits is now done with `#[derive(...)]`
3774 not `#[deriving(...)]` for [consistency with other naming
3775 conventions][derive].
3776 * Importing the containing module or enum at the same time as
3777 items or variants they contain is [now done with `self` instead
3778 of `mod`][self], as in use `foo::{self, bar}`
3779 * Glob imports are no longer feature-gated.
3780 * The `box` operator and `box` patterns have been feature-gated
3781 pending a redesign. For now unique boxes should be allocated
3782 like other containers, with `Box::new`.
3786 * A [series][coll1] of [efforts][coll2] to establish
3787 [conventions][coll3] for collections types has resulted in API
3788 improvements throughout the standard library.
3789 * New [APIs for error handling][err] provide ergonomic interop
3790 between error types, and [new conventions][err-conv] describe
3791 more clearly the recommended error handling strategies in Rust.
3792 * The `fail!` macro has been renamed to [`panic!`][panic] so that
3793 it is easier to discuss failure in the context of error handling
3794 without making clarifications as to whether you are referring to
3795 the 'fail' macro or failure more generally.
3796 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
3797 syscall when available.
3798 * The 'serialize' crate has been renamed 'rustc-serialize' and
3799 moved out of the distribution to Cargo. Although it is widely
3800 used now, it is expected to be superseded in the near future.
3801 * The `Show` formatter, typically implemented with
3802 `#[derive(Show)]` is [now requested with the `{:?}`
3803 specifier][show] and is intended for use by all types, for uses
3804 such as `println!` debugging. The new `String` formatter must be
3805 implemented by hand, uses the `{}` specifier, and is intended
3806 for full-fidelity conversions of things that can logically be
3807 represented as strings.
3811 * [Flexible target specification][flex] allows rustc's code
3812 generation to be configured to support otherwise-unsupported
3814 * Rust comes with rust-gdb and rust-lldb scripts that launch their
3815 respective debuggers with Rust-appropriate pretty-printing.
3816 * The Windows installation of Rust is distributed with the
3817 MinGW components currently required to link binaries on that
3822 * Nullable enum optimizations have been extended to more types so
3823 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
3824 space than the inner types themselves.
3825 * Work has begun on supporting AArch64.
3827 [Cargo]: https://crates.io
3828 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
3829 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
3830 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
3831 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
3832 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
3833 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
3834 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
3835 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
3836 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
3837 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
3838 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
3839 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
3840 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
3841 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
3842 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
3843 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
3844 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
3845 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
3846 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
3847 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
3848 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
3849 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
3850 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
3851 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
3852 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
3853 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
3854 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
3855 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
3856 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
3857 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
3858 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
3859 [trpl]: https://doc.rust-lang.org/book/index.html
3860 [rbe]: http://rustbyexample.com/
3863 Version 0.12.0 (2014-10-09)
3864 =============================
3866 * ~1900 changes, numerous bugfixes
3870 * The introductory documentation (now called The Rust Guide) has
3871 been completely rewritten, as have a number of supplementary
3873 * Rust's package manager, Cargo, continues to improve and is
3874 sometimes considered to be quite awesome.
3875 * Many API's in `std` have been reviewed and updated for
3876 consistency with the in-development Rust coding
3877 guidelines. The standard library documentation tracks
3878 stabilization progress.
3879 * Minor libraries have been moved out-of-tree to the rust-lang org
3880 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
3881 be installed with Cargo.
3882 * Lifetime elision allows lifetime annotations to be left off of
3883 function declarations in many common scenarios.
3884 * Rust now works on 64-bit Windows.
3887 * Indexing can be overloaded with the `Index` and `IndexMut`
3889 * The `if let` construct takes a branch only if the `let` pattern
3890 matches, currently behind the 'if_let' feature gate.
3891 * 'where clauses', a more flexible syntax for specifying trait
3892 bounds that is more aesthetic, have been added for traits and
3893 free functions. Where clauses will in the future make it
3894 possible to constrain associated types, which would be
3895 impossible with the existing syntax.
3896 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
3897 the 'slicing_syntax' feature gate, and can be overloaded with
3898 the `Slice` or `SliceMut` traits.
3899 * The syntax for matching of sub-slices has been changed to use a
3900 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
3901 consistency with other uses of `..` and to future-proof
3902 potential additional uses of the syntax.
3903 * The syntax for matching inclusive ranges in patterns has changed
3904 from `0..3` to `0...4` to be consistent with the exclusive range
3906 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
3907 c]`) has been put behind the 'advanced_slice_patterns' feature
3908 gate and may be removed in the future.
3909 * Components of tuples and tuple structs can be extracted using
3910 the `value.0` syntax, currently behind the `tuple_indexing`
3912 * The `#[crate_id]` attribute is no longer supported; versioning
3913 is handled by the package manager.
3914 * Renaming crate imports are now written `extern crate foo as bar`
3915 instead of `extern crate bar = foo`.
3916 * Renaming use statements are now written `use foo as bar` instead
3918 * `let` and `match` bindings and argument names in macros are now
3920 * The new, more efficient, closure types ('unboxed closures') have
3921 been added under a feature gate, 'unboxed_closures'. These will
3922 soon replace the existing closure types, once higher-ranked
3923 trait lifetimes are added to the language.
3924 * `move` has been added as a keyword, for indicating closures
3925 that capture by value.
3926 * Mutation and assignment is no longer allowed in pattern guards.
3927 * Generic structs and enums can now have trait bounds.
3928 * The `Share` trait is now called `Sync` to free up the term
3929 'shared' to refer to 'shared reference' (the default reference
3931 * Dynamically-sized types have been mostly implemented,
3932 unifying the behavior of fat-pointer types with the rest of the
3934 * As part of dynamically-sized types, the `Sized` trait has been
3935 introduced, which qualifying types implement by default, and
3936 which type parameters expect by default. To specify that a type
3937 parameter does not need to be sized, write `<Sized? T>`. Most
3938 types are `Sized`, notable exceptions being unsized arrays
3939 (`[T]`) and trait types.
3940 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
3941 * Lifetime bounds can now be applied to type parameters and object
3943 * The old, reference counted GC type, `Gc<T>` which was once
3944 denoted by the `@` sigil, has finally been removed. GC will be
3945 revisited in the future.
3948 * Library documentation has been improved for a number of modules.
3949 * Bit-vectors, collections::bitv has been modernized.
3950 * The url crate is deprecated in favor of
3951 http://github.com/servo/rust-url, which can be installed with
3953 * Most I/O stream types can be cloned and subsequently closed from
3955 * A `std::time::Duration` type has been added for use in I/O
3956 methods that rely on timers, as well as in the 'time' crate's
3957 `Timespec` arithmetic.
3958 * The runtime I/O abstraction layer that enabled the green thread
3959 scheduler to do non-thread-blocking I/O has been removed, along
3960 with the libuv-based implementation employed by the green thread
3961 scheduler. This will greatly simplify the future I/O work.
3962 * `collections::btree` has been rewritten to have a more
3963 idiomatic and efficient design.
3966 * rustdoc output now indicates the stability levels of API's.
3967 * The `--crate-name` flag can specify the name of the crate
3968 being compiled, like `#[crate_name]`.
3969 * The `-C metadata` specifies additional metadata to hash into
3970 symbol names, and `-C extra-filename` specifies additional
3971 information to put into the output filename, for use by the
3972 package manager for versioning.
3973 * debug info generation has continued to improve and should be
3974 more reliable under both gdb and lldb.
3975 * rustc has experimental support for compiling in parallel
3976 using the `-C codegen-units` flag.
3977 * rustc no longer encodes rpath information into binaries by
3981 * Stack usage has been optimized with LLVM lifetime annotations.
3982 * Official Rust binaries on Linux are more compatible with older
3983 kernels and distributions, built on CentOS 5.10.
3986 Version 0.11.0 (2014-07-02)
3987 ==========================
3989 * ~1700 changes, numerous bugfixes
3992 * ~[T] has been removed from the language. This type is superseded by
3994 * ~str has been removed from the language. This type is superseded by
3996 * ~T has been removed from the language. This type is superseded by the
3998 * @T has been removed from the language. This type is superseded by the
3999 standard library's std::gc::Gc<T> type.
4000 * Struct fields are now all private by default.
4001 * Vector indices and shift amounts are both required to be a `uint`
4002 instead of any integral type.
4003 * Byte character, byte string, and raw byte string literals are now all
4004 supported by prefixing the normal literal with a `b`.
4005 * Multiple ABIs are no longer allowed in an ABI string
4006 * The syntax for lifetimes on closures/procedures has been tweaked
4007 slightly: `<'a>|A, B|: 'b + K -> T`
4008 * Floating point modulus has been removed from the language; however it
4009 is still provided by a library implementation.
4010 * Private enum variants are now disallowed.
4011 * The `priv` keyword has been removed from the language.
4012 * A closure can no longer be invoked through a &-pointer.
4013 * The `use foo, bar, baz;` syntax has been removed from the language.
4014 * The transmute intrinsic no longer works on type parameters.
4015 * Statics now allow blocks/items in their definition.
4016 * Trait bounds are separated from objects with + instead of : now.
4017 * Objects can no longer be read while they are mutably borrowed.
4018 * The address of a static is now marked as insignificant unless the
4019 #[inline(never)] attribute is placed it.
4020 * The #[unsafe_destructor] attribute is now behind a feature gate.
4021 * Struct literals are no longer allowed in ambiguous positions such as
4022 if, while, match, and for..in.
4023 * Declaration of lang items and intrinsics are now feature-gated by
4025 * Integral literals no longer default to `int`, and floating point
4026 literals no longer default to `f64`. Literals must be suffixed with an
4027 appropriate type if inference cannot determine the type of the
4029 * The Box<T> type is no longer implicitly borrowed to &mut T.
4030 * Procedures are now required to not capture borrowed references.
4033 * The standard library is now a "facade" over a number of underlying
4034 libraries. This means that development on the standard library should
4035 be speeder due to smaller crates, as well as a clearer line between
4037 * A new library, libcore, lives under the standard library's facade
4038 which is Rust's "0-assumption" library, suitable for embedded and
4039 kernel development for example.
4040 * A regex crate has been added to the standard distribution. This crate
4041 includes statically compiled regular expressions.
4042 * The unwrap/unwrap_err methods on Result require a Show bound for
4043 better error messages.
4044 * The return types of the std::comm primitives have been centralized
4045 around the Result type.
4046 * A number of I/O primitives have gained the ability to time out their
4048 * A number of I/O primitives have gained the ability to close their
4049 reading/writing halves to cancel pending operations.
4050 * Reverse iterator methods have been removed in favor of `rev()` on
4051 their forward-iteration counterparts.
4052 * A bitflags! macro has been added to enable easy interop with C and
4053 management of bit flags.
4054 * A debug_assert! macro is now provided which is disabled when
4055 `--cfg ndebug` is passed to the compiler.
4056 * A graphviz crate has been added for creating .dot files.
4057 * The std::cast module has been migrated into std::mem.
4058 * The std::local_data api has been migrated from freestanding functions
4059 to being based on methods.
4060 * The Pod trait has been renamed to Copy.
4061 * jemalloc has been added as the default allocator for types.
4062 * The API for allocating memory has been changed to use proper alignment
4063 and sized deallocation
4064 * Connecting a TcpStream or binding a TcpListener is now based on a
4065 string address and a u16 port. This allows connecting to a hostname as
4067 * The Reader trait now contains a core method, read_at_least(), which
4068 correctly handles many repeated 0-length reads.
4069 * The process-spawning API is now centered around a builder-style
4071 * The :? printing qualifier has been moved from the standard library to
4072 an external libdebug crate.
4073 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
4074 have been renamed to Eq/Ord.
4075 * The select/plural methods have been removed from format!. The escapes
4076 for { and } have also changed from \{ and \} to {{ and }},
4078 * The TaskBuilder API has been re-worked to be a true builder, and
4079 extension traits for spawning native/green tasks have been added.
4082 * All breaking changes to the language or libraries now have their
4083 commit message annotated with `[breaking-change]` to allow for easy
4084 discovery of breaking changes.
4085 * The compiler will now try to suggest how to annotate lifetimes if a
4086 lifetime-related error occurs.
4087 * Debug info continues to be improved greatly with general bug fixes and
4088 better support for situations like link time optimization (LTO).
4089 * Usage of syntax extensions when cross-compiling has been fixed.
4090 * Functionality equivalent to GCC & Clang's -ffunction-sections,
4091 -fdata-sections and --gc-sections has been enabled by default
4092 * The compiler is now stricter about where it will load module files
4093 from when a module is declared via `mod foo;`.
4094 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
4095 Syntax extensions are now discovered via a "plugin registrar" type
4096 which will be extended in the future to other various plugins.
4097 * Lints have been restructured to allow for dynamically loadable lints.
4098 * A number of rustdoc improvements:
4099 * The HTML output has been visually redesigned.
4100 * Markdown is now powered by hoedown instead of sundown.
4101 * Searching heuristics have been greatly improved.
4102 * The search index has been reduced in size by a great amount.
4103 * Cross-crate documentation via `pub use` has been greatly improved.
4104 * Primitive types are now hyperlinked and documented.
4105 * Documentation has been moved from static.rust-lang.org/doc to
4107 * A new sandbox, play.rust-lang.org, is available for running and
4108 sharing rust code examples on-line.
4109 * Unused attributes are now more robustly warned about.
4110 * The dead_code lint now warns about unused struct fields.
4111 * Cross-compiling to iOS is now supported.
4112 * Cross-compiling to mipsel is now supported.
4113 * Stability attributes are now inherited by default and no longer apply
4114 to intra-crate usage, only inter-crate usage.
4115 * Error message related to non-exhaustive match expressions have been
4119 Version 0.10 (2014-04-03)
4120 =========================
4122 * ~1500 changes, numerous bugfixes
4125 * A new RFC process is now in place for modifying the language.
4126 * Patterns with `@`-pointers have been removed from the language.
4127 * Patterns with unique vectors (`~[T]`) have been removed from the
4129 * Patterns with unique strings (`~str`) have been removed from the
4131 * `@str` has been removed from the language.
4132 * `@[T]` has been removed from the language.
4133 * `@self` has been removed from the language.
4134 * `@Trait` has been removed from the language.
4135 * Headers on `~` allocations which contain `@` boxes inside the type for
4136 reference counting have been removed.
4137 * The semantics around the lifetimes of temporary expressions have changed,
4138 see #3511 and #11585 for more information.
4139 * Cross-crate syntax extensions are now possible, but feature gated. See
4140 #11151 for more information. This includes both `macro_rules!` macros as
4141 well as syntax extensions such as `format!`.
4142 * New lint modes have been added, and older ones have been turned on to be
4144 * Unnecessary parentheses
4147 * Uppercase variables
4148 * Publicly visible private types
4149 * `#[deriving]` with raw pointers
4150 * Unsafe functions can no longer be coerced to closures.
4151 * Various obscure macros such as `log_syntax!` are now behind feature gates.
4152 * The `#[simd]` attribute is now behind a feature gate.
4153 * Visibility is no longer allowed on `extern crate` statements, and
4154 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
4155 * Trailing commas are now allowed in argument lists and tuple patterns.
4156 * The `do` keyword has been removed, it is now a reserved keyword.
4157 * Default type parameters have been implemented, but are feature gated.
4158 * Borrowed variables through captures in closures are now considered soundly.
4159 * `extern mod` is now `extern crate`
4160 * The `Freeze` trait has been removed.
4161 * The `Share` trait has been added for types that can be shared among
4163 * Labels in macros are now hygienic.
4164 * Expression/statement macro invocations can be delimited with `{}` now.
4165 * Treatment of types allowed in `static mut` locations has been tweaked.
4166 * The `*` and `.` operators are now overloadable through the `Deref` and
4168 * `~Trait` and `proc` no longer have `Send` bounds by default.
4169 * Partial type hints are now supported with the `_` type marker.
4170 * An `Unsafe` type was introduced for interior mutability. It is now
4171 considered undefined to transmute from `&T` to `&mut T` without using the
4173 * The #[linkage] attribute was implemented for extern statics/functions.
4174 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
4175 * `Pod` was renamed to `Copy`.
4178 * The `libextra` library has been removed. It has now been decomposed into
4179 component libraries with smaller and more focused nuggets of
4180 functionality. The full list of libraries can be found on the
4181 documentation index page.
4182 * std: `std::condition` has been removed. All I/O errors are now propagated
4183 through the `Result` type. In order to assist with error handling, a
4184 `try!` macro for unwrapping errors with an early return and a lint for
4185 unused results has been added. See #12039 for more information.
4186 * std: The `vec` module has been renamed to `slice`.
4187 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
4188 This will become the only growable vector in the future.
4189 * std: `std::io` now has more public-reexports. Types such as `BufferedReader`
4190 are now found at `std::io::BufferedReader` instead of
4191 `std::io::buffered::BufferedReader`.
4192 * std: `print` and `println` are no longer in the prelude, the `print!` and
4193 `println!` macros are intended to be used instead.
4194 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
4195 attempts to statically prevent cycles.
4196 * std: The standard distribution is adopting the policy of pushing failure
4197 to the user rather than failing in libraries. Many functions (such as
4198 `slice::last()`) now return `Option<T>` instead of `T` + failing.
4199 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
4200 deriving mode: `#[deriving(Show)]`.
4201 * std: `ToStr` is now implemented for all types implementing `Show`.
4202 * std: The formatting trait methods now take `&self` instead of `&T`
4203 * std: The `invert()` method on iterators has been renamed to `rev()`
4204 * std: `std::num` has seen a reduction in the genericity of its traits,
4205 consolidating functionality into a few core traits.
4206 * std: Backtraces are now printed on task failure if the environment
4207 variable `RUST_BACKTRACE` is present.
4208 * std: Naming conventions for iterators have been standardized. More details
4209 can be found on the wiki's style guide.
4210 * std: `eof()` has been removed from the `Reader` trait. Specific types may
4211 still implement the function.
4212 * std: Networking types are now cloneable to allow simultaneous reads/writes.
4213 * std: `assert_approx_eq!` has been removed
4214 * std: The `e` and `E` formatting specifiers for floats have been added to
4215 print them in exponential notation.
4216 * std: The `Times` trait has been removed
4217 * std: Indications of variance and opting out of builtin bounds is done
4218 through marker types in `std::kinds::marker` now
4219 * std: `hash` has been rewritten, `IterBytes` has been removed, and
4220 `#[deriving(Hash)]` is now possible.
4221 * std: `SharedChan` has been removed, `Sender` is now cloneable.
4222 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
4223 * std: `Chan::new` is now `channel()`.
4224 * std: A new synchronous channel type has been implemented.
4225 * std: A `select!` macro is now provided for selecting over `Receiver`s.
4226 * std: `hashmap` and `trie` have been moved to `libcollections`
4227 * std: `run` has been rolled into `io::process`
4228 * std: `assert_eq!` now uses `{}` instead of `{:?}`
4229 * std: The equality and comparison traits have seen some reorganization.
4230 * std: `rand` has moved to `librand`.
4231 * std: `to_{lower,upper}case` has been implemented for `char`.
4232 * std: Logging has been moved to `liblog`.
4233 * collections: `HashMap` has been rewritten for higher performance and less
4235 * native: The default runtime is now `libnative`. If `libgreen` is desired,
4236 it can be booted manually. The runtime guide has more information and
4238 * native: All I/O functionality except signals has been implemented.
4239 * green: Task spawning with `libgreen` has been optimized with stack caching
4240 and various trimming of code.
4241 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
4242 * sync: The `extra::sync` module has been updated to modern rust (and moved
4243 to the `sync` library), tweaking and improving various interfaces while
4244 dropping redundant functionality.
4245 * sync: A new `Barrier` type has been added to the `sync` library.
4246 * sync: An efficient mutex for native and green tasks has been implemented.
4247 * serialize: The `base64` module has seen some improvement. It treats
4248 newlines better, has non-string error values, and has seen general
4250 * fourcc: A `fourcc!` macro was introduced
4251 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
4252 hexadecimal literal.
4255 * `rustpkg` has been deprecated and removed from the main repository. Its
4256 replacement, `cargo`, is under development.
4257 * Nightly builds of rust are now available
4258 * The memory usage of rustc has been improved many times throughout this
4260 * The build process supports disabling rpath support for the rustc binary
4262 * Code generation has improved in some cases, giving more information to the
4263 LLVM optimization passes to enable more extensive optimizations.
4264 * Debuginfo compatibility with lldb on OSX has been restored.
4265 * The master branch is now gated on an android bot, making building for
4266 android much more reliable.
4267 * Output flags have been centralized into one `--emit` flag.
4268 * Crate type flags have been centralized into one `--crate-type` flag.
4269 * Codegen flags have been consolidated behind a `-C` flag.
4270 * Linking against outdated crates now has improved error messages.
4271 * Error messages with lifetimes will often suggest how to annotate the
4272 function to fix the error.
4273 * Many more types are documented in the standard library, and new guides
4275 * Many `rustdoc` improvements:
4276 * code blocks are syntax highlighted.
4277 * render standalone markdown files.
4278 * the --test flag tests all code blocks by default.
4279 * exported macros are displayed.
4280 * reexported types have their documentation inlined at the location of the
4282 * search works across crates that have been rendered to the same output
4286 Version 0.9 (2014-01-09)
4287 ==========================
4289 * ~1800 changes, numerous bugfixes
4292 * The `float` type has been removed. Use `f32` or `f64` instead.
4293 * A new facility for enabling experimental features (feature gating) has
4294 been added, using the crate-level `#[feature(foo)]` attribute.
4295 * Managed boxes (@) are now behind a feature gate
4296 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
4297 standard library's `Gc` or `Rc` types instead.
4298 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
4299 * Jumping back to the top of a loop is now done with `continue` instead of
4301 * Strings can no longer be mutated through index assignment.
4302 * Raw strings can be created via the basic `r"foo"` syntax or with matched
4303 hash delimiters, as in `r###"foo"###`.
4304 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
4306 * The `&fn` type is now written `|args| -> ret` to match the literal form.
4307 * `@fn`s have been removed.
4308 * `do` only works with procs in order to make it obvious what the cost
4310 * Single-element tuple-like structs can no longer be dereferenced to
4311 obtain the inner value. A more comprehensive solution for overloading
4312 the dereference operator will be provided in the future.
4313 * The `#[link(...)]` attribute has been replaced with
4314 `#[crate_id = "name#vers"]`.
4315 * Empty `impl`s must be terminated with empty braces and may not be
4316 terminated with a semicolon.
4317 * Keywords are no longer allowed as lifetime names; the `self` lifetime
4318 no longer has any special meaning.
4319 * The old `fmt!` string formatting macro has been removed.
4320 * `printf!` and `printfln!` (old-style formatting) removed in favor of
4321 `print!` and `println!`.
4322 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
4323 * The `extern mod foo (name = "bar")` syntax has been removed. Use
4324 `extern mod foo = "bar"` instead.
4325 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
4326 * Macros can have attributes.
4327 * Macros can expand to items with attributes.
4328 * Macros can expand to multiple items.
4329 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
4330 * Comments may be nested.
4331 * Values automatically coerce to trait objects they implement, without
4333 * Enum discriminants are no longer an entire word but as small as needed to
4334 contain all the variants. The `repr` attribute can be used to override
4335 the discriminant size, as in `#[repr(int)]` for integer-sized, and
4336 `#[repr(C)]` to match C enums.
4337 * Non-string literals are not allowed in attributes (they never worked).
4338 * The FFI now supports variadic functions.
4339 * Octal numeric literals, as in `0o7777`.
4340 * The `concat!` syntax extension performs compile-time string concatenation.
4341 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
4342 removed as Rust no longer uses segmented stacks.
4343 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
4344 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
4345 not `*`; ignoring remaining fields of a struct is also done with `..`,
4346 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
4347 * `rustc` supports the "win64" calling convention via `extern "win64"`.
4348 * `rustc` supports the "system" calling convention, which defaults to the
4349 preferred convention for the target platform, "stdcall" on 32-bit Windows,
4351 * The `type_overflow` lint (default: warn) checks literals for overflow.
4352 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
4353 * The `attribute_usage` lint (default: warn) warns about unknown
4355 * The `unknown_features` lint (default: warn) warns about unknown
4357 * The `dead_code` lint (default: warn) checks for dead code.
4358 * Rust libraries can be linked statically to one another
4359 * `#[link_args]` is behind the `link_args` feature gate.
4360 * Native libraries are now linked with `#[link(name = "foo")]`
4361 * Native libraries can be statically linked to a rust crate
4362 (`#[link(name = "foo", kind = "static")]`).
4363 * Native OS X frameworks are now officially supported
4364 (`#[link(name = "foo", kind = "framework")]`).
4365 * The `#[thread_local]` attribute creates thread-local (not task-local)
4366 variables. Currently behind the `thread_local` feature gate.
4367 * The `return` keyword may be used in closures.
4368 * Types that can be copied via a memcpy implement the `Pod` kind.
4369 * The `cfg` attribute can now be used on struct fields and enum variants.
4372 * std: The `option` and `result` API's have been overhauled to make them
4373 simpler, more consistent, and more composable.
4374 * std: The entire `std::io` module has been replaced with one that is
4375 more comprehensive and that properly interfaces with the underlying
4376 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
4378 * std: `io::util` contains a number of useful implementations of
4379 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
4380 `ZeroReader`, `TeeReader`.
4381 * std: The reference counted pointer type `extra::rc` moved into std.
4382 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
4383 just a wrapper around it).
4384 * std: The `Either` type has been removed.
4385 * std: `fmt::Default` can be implemented for any type to provide default
4386 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
4387 * std: The `rand` API continues to be tweaked.
4388 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
4389 on failure in gdb, is now named `rust_fail`.
4390 * std: The `each_key` and `each_value` methods on `HashMap` have been
4391 replaced by the `keys` and `values` iterators.
4392 * std: Functions dealing with type size and alignment have moved from the
4393 `sys` module to the `mem` module.
4394 * std: The `path` module was written and API changed.
4395 * std: `str::from_utf8` has been changed to cast instead of allocate.
4396 * std: `starts_with` and `ends_with` methods added to vectors via the
4397 `ImmutableEqVector` trait, which is in the prelude.
4398 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
4399 if the index is out of bounds.
4400 * std: Task failure no longer propagates between tasks, as the model was
4401 complex, expensive, and incompatible with thread-based tasks.
4402 * std: The `Any` type can be used for dynamic typing.
4403 * std: `~Any` can be passed to the `fail!` macro and retrieved via
4405 * std: Methods that produce iterators generally do not have an `_iter`
4407 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
4408 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
4409 * std: `util::ignore` renamed to `prelude::drop`.
4410 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
4412 * std: `vec::raw` has seen a lot of cleanup and API changes.
4413 * std: The standard library no longer includes any C++ code, and very
4414 minimal C, eliminating the dependency on libstdc++.
4415 * std: Runtime scheduling and I/O functionality has been factored out into
4416 extensible interfaces and is now implemented by two different crates:
4417 libnative, for native threading and I/O; and libgreen, for green threading
4418 and I/O. This paves the way for using the standard library in more limited
4419 embedded environments.
4420 * std: The `comm` module has been rewritten to be much faster, have a
4421 simpler, more consistent API, and to work for both native and green
4423 * std: All libuv dependencies have been moved into the rustuv crate.
4424 * native: New implementations of runtime scheduling on top of OS threads.
4425 * native: New native implementations of TCP, UDP, file I/O, process spawning,
4427 * green: The green thread scheduler and message passing types are almost
4429 * extra: The `flatpipes` module had bitrotted and was removed.
4430 * extra: All crypto functions have been removed and Rust now has a policy of
4431 not reimplementing crypto in the standard library. In the future crypto
4432 will be provided by external crates with bindings to established libraries.
4433 * extra: `c_vec` has been modernized.
4434 * extra: The `sort` module has been removed. Use the `sort` method on
4438 * The `rust` and `rusti` commands have been removed, due to lack of
4440 * `rustdoc` was completely rewritten.
4441 * `rustdoc` can test code examples in documentation.
4442 * `rustpkg` can test packages with the argument, 'test'.
4443 * `rustpkg` supports arbitrary dependencies, including C libraries.
4444 * `rustc`'s support for generating debug info is improved again.
4445 * `rustc` has better error reporting for unbalanced delimiters.
4446 * `rustc`'s JIT support was removed due to bitrot.
4447 * Executables and static libraries can be built with LTO (-Z lto)
4448 * `rustc` adds a `--dep-info` flag for communicating dependencies to
4452 Version 0.8 (2013-09-26)
4453 ============================
4455 * ~2200 changes, numerous bugfixes
4458 * The `for` loop syntax has changed to work with the `Iterator` trait.
4459 * At long last, unwinding works on Windows.
4460 * Default methods are ready for use.
4461 * Many trait inheritance bugs fixed.
4462 * Owned and borrowed trait objects work more reliably.
4463 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
4464 * rustc can omit emission of code for the `debug!` macro if it is passed
4466 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
4467 for foo.rs, then foo/mod.rs, and will generate an error when both are
4469 * Strings no longer contain trailing nulls. The new `std::c_str` module
4470 provides new mechanisms for converting to C strings.
4471 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
4472 * The FFI has been overhauled such that foreign functions are called directly,
4473 instead of through a stack-switching wrapper.
4474 * Calling a foreign function must be done through a Rust function with the
4475 `#[fixed_stack_segment]` attribute.
4476 * The `externfn!` macro can be used to declare both a foreign function and
4477 a `#[fixed_stack_segment]` wrapper at once.
4478 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
4479 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
4480 * `priv` is disallowed everywhere except for struct fields and enum variants.
4481 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
4482 * `ref` bindings in irrefutable patterns work correctly now.
4483 * `char` is now prevented from containing invalid code points.
4484 * Casting to `bool` is no longer allowed.
4485 * `\0` is now accepted as an escape in chars and strings.
4486 * `yield` is a reserved keyword.
4487 * `typeof` is a reserved keyword.
4488 * Crates may be imported by URL with `extern mod foo = "url";`.
4489 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
4490 * Static vectors can be initialized with repeating elements,
4491 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
4492 * Static structs can be initialized with functional record update,
4493 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
4494 * `cfg!` can be used to conditionally execute code based on the crate
4495 configuration, similarly to `#[cfg(...)]`.
4496 * The `unnecessary_qualification` lint detects unneeded module
4497 prefixes (default: allow).
4498 * Arithmetic operations have been implemented on the SIMD types in
4499 `std::unstable::simd`.
4500 * Exchange allocation headers were removed, reducing memory usage.
4501 * `format!` implements a completely new, extensible, and higher-performance
4502 string formatting system. It will replace `fmt!`.
4503 * `print!` and `println!` write formatted strings (using the `format!`
4504 extension) to stdout.
4505 * `write!` and `writeln!` write formatted strings (using the `format!`
4506 extension) to the new Writers in `std::rt::io`.
4507 * The library section in which a function or static is placed may
4508 be specified with `#[link_section = "..."]`.
4509 * The `proto!` syntax extension for defining bounded message protocols
4511 * `macro_rules!` is hygienic for `let` declarations.
4512 * The `#[export_name]` attribute specifies the name of a symbol.
4513 * `unreachable!` can be used to indicate unreachable code, and fails
4517 * std: Transitioned to the new runtime, written in Rust.
4518 * std: Added an experimental I/O library, `rt::io`, based on the new
4520 * std: A new generic `range` function was added to the prelude, replacing
4521 `uint::range` and friends.
4522 * std: `range_rev` no longer exists. Since range is an iterator it can be
4523 reversed with `range(lo, hi).invert()`.
4524 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
4525 renamed to `unwrap_or`.
4526 * std: The `iterator` module was renamed to `iter`.
4527 * std: Integral types now support the `checked_add`, `checked_sub`, and
4528 `checked_mul` operations for detecting overflow.
4529 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
4531 * std: Methods are standardizing on conventions for casting methods:
4532 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
4534 * std: The `CString` type in `c_str` provides new ways to convert to and
4536 * std: `DoubleEndedIterator` can yield elements in two directions.
4537 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
4539 * std: `str::from_bytes` renamed to `str::from_utf8`.
4540 * std: `pop_opt` and `shift_opt` methods added to vectors.
4541 * std: The task-local data interface no longer uses @, and keys are
4542 no longer function pointers.
4543 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
4544 * std: Added `SharedPort` to `comm`.
4545 * std: `Eq` has a default method for `ne`; only `eq` is required
4547 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
4548 is required in implementations.
4549 * std: `is_utf8` performance is improved, impacting many string functions.
4550 * std: `os::MemoryMap` provides cross-platform mmap.
4551 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
4552 are not 'in-bounds' are considered undefined.
4553 * std: Many freestanding functions in `vec` removed in favor of methods.
4554 * std: Many freestanding functions on scalar types removed in favor of
4556 * std: Many options to task builders were removed since they don't make
4557 sense in the new scheduler design.
4558 * std: More containers implement `FromIterator` so can be created by the
4560 * std: More complete atomic types in `unstable::atomics`.
4561 * std: `comm::PortSet` removed.
4562 * std: Mutating methods in the `Set` and `Map` traits have been moved into
4563 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
4564 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
4565 default implementations.
4566 * std: Various `from_str` functions were removed in favor of a generic
4567 `from_str` which is available in the prelude.
4568 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
4569 * extra: `dlist`, the doubly-linked list was modernized.
4570 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
4571 * extra: Added `glob` module, replacing `std::os::glob`.
4572 * extra: `rope` was removed.
4573 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
4574 * extra: `net`, and `timer` were removed. The experimental replacements
4575 are `std::rt::io::net` and `std::rt::io::timer`.
4576 * extra: Iterators implemented for `SmallIntMap`.
4577 * extra: Iterators implemented for `Bitv` and `BitvSet`.
4578 * extra: `SmallIntSet` removed. Use `BitvSet`.
4579 * extra: Performance of JSON parsing greatly improved.
4580 * extra: `semver` updated to SemVer 2.0.0.
4581 * extra: `term` handles more terminals correctly.
4582 * extra: `dbg` module removed.
4583 * extra: `par` module removed.
4584 * extra: `future` was cleaned up, with some method renames.
4585 * extra: Most free functions in `getopts` were converted to methods.
4588 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
4589 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
4590 similarly to gcc's `--march` flag.
4591 * rustc's performance compiling small crates is much better.
4592 * rustpkg has received many improvements.
4593 * rustpkg supports git tags as package IDs.
4594 * rustpkg builds into target-specific directories so it can be used for
4596 * The number of concurrent test tasks is controlled by the environment
4597 variable RUST_TEST_TASKS.
4598 * The test harness can now report metrics for benchmarks.
4599 * All tools have man pages.
4600 * Programs compiled with `--test` now support the `-h` and `--help` flags.
4601 * The runtime uses jemalloc for allocations.
4602 * Segmented stacks are temporarily disabled as part of the transition to
4603 the new runtime. Stack overflows are possible!
4604 * A new documentation backend, rustdoc_ng, is available for use. It is
4605 still invoked through the normal `rustdoc` command.
4608 Version 0.7 (2013-07-03)
4609 =======================
4611 * ~2000 changes, numerous bugfixes
4614 * `impl`s no longer accept a visibility qualifier. Put them on methods
4616 * The borrow checker has been rewritten with flow-sensitivity, fixing
4617 many bugs and inconveniences.
4618 * The `self` parameter no longer implicitly means `&'self self`,
4619 and can be explicitly marked with a lifetime.
4620 * Overloadable compound operators (`+=`, etc.) have been temporarily
4621 removed due to bugs.
4622 * The `for` loop protocol now requires `for`-iterators to return `bool`
4623 so they compose better.
4624 * The `Durable` trait is replaced with the `'static` bounds.
4625 * Trait default methods work more often.
4626 * Structs with the `#[packed]` attribute have byte alignment and
4627 no padding between fields.
4628 * Type parameters bound by `Copy` must now be copied explicitly with
4630 * It is now illegal to move out of a dereferenced unsafe pointer.
4631 * `Option<~T>` is now represented as a nullable pointer.
4632 * `@mut` does dynamic borrow checks correctly.
4633 * The `main` function is only detected at the topmost level of the crate.
4634 The `#[main]` attribute is still valid anywhere.
4635 * Struct fields may no longer be mutable. Use inherited mutability.
4636 * The `#[no_send]` attribute makes a type that would otherwise be
4638 * The `#[no_freeze]` attribute makes a type that would otherwise be
4640 * Unbounded recursion will abort the process after reaching the limit
4641 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
4642 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
4643 are never implicitly copyable.
4644 * `#[static_assert]` makes compile-time assertions about static bools.
4645 * At long last, 'argument modes' no longer exist.
4646 * The rarely used `use mod` statement no longer exists.
4649 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
4651 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
4652 `Rand`, `Zero` and `ToStr` can all be automatically derived with
4654 * The `bytes!` macro returns a vector of bytes for string, u8, char,
4655 and unsuffixed integer literals.
4658 * The `core` crate was renamed to `std`.
4659 * The `std` crate was renamed to `extra`.
4660 * More and improved documentation.
4661 * std: `iterator` module for external iterator objects.
4662 * Many old-style (internal, higher-order function) iterators replaced by
4663 implementations of `Iterator`.
4664 * std: Many old internal vector and string iterators,
4665 incl. `any`, `all`. removed.
4666 * std: The `finalize` method of `Drop` renamed to `drop`.
4667 * std: The `drop` method now takes `&mut self` instead of `&self`.
4668 * std: The prelude no longer reexports any modules, only types and traits.
4669 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
4670 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
4671 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
4672 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
4673 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
4674 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
4675 * std: Many types implement `Clone`.
4676 * std: `path` type renamed to `Path`.
4677 * std: `mut` module and `Mut` type removed.
4678 * std: Many standalone functions removed in favor of methods and iterators
4679 in `vec`, `str`. In the future methods will also work as functions.
4680 * std: `reinterpret_cast` removed. Use `transmute`.
4681 * std: ascii string handling in `std::ascii`.
4682 * std: `Rand` is implemented for ~/@.
4683 * std: `run` module for spawning processes overhauled.
4684 * std: Various atomic types added to `unstable::atomic`.
4685 * std: Various types implement `Zero`.
4686 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
4687 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
4688 * std: Added `os::mkdir_recursive`.
4689 * std: Added `os::glob` function performs filesystems globs.
4690 * std: `FuzzyEq` renamed to `ApproxEq`.
4691 * std: `Map` now defines `pop` and `swap` methods.
4692 * std: `Cell` constructors converted to static methods.
4693 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
4694 * extra: `flate` module moved from `std` to `extra`.
4695 * extra: `fileinput` module for iterating over a series of files.
4696 * extra: `Complex` number type and `complex` module.
4697 * extra: `Rational` number type and `rational` module.
4698 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
4699 * extra: `term` uses terminfo now, is more correct.
4700 * extra: `arc` functions converted to methods.
4701 * extra: Implementation of fixed output size variations of SHA-2.
4704 * `unused_variable` lint mode for unused variables (default: warn).
4705 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
4707 * `unused_mut` lint mode for identifying unused `mut` qualifiers
4709 * `dead_assignment` lint mode for unread variables (default: warn).
4710 * `unnecessary_allocation` lint mode detects some heap allocations that are
4711 immediately borrowed so could be written without allocating (default: warn).
4712 * `missing_doc` lint mode (default: allow).
4713 * `unreachable_code` lint mode (default: warn).
4714 * The `rusti` command has been rewritten and a number of bugs addressed.
4715 * rustc outputs in color on more terminals.
4716 * rustc accepts a `--link-args` flag to pass arguments to the linker.
4717 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
4718 * Compiling with `-g` will make the binary record information about
4719 dynamic borrowcheck failures for debugging.
4720 * rustdoc has a nicer stylesheet.
4721 * Various improvements to rustdoc.
4722 * Improvements to rustpkg (see the detailed release notes).
4725 Version 0.6 (2013-04-03)
4726 ========================
4728 * ~2100 changes, numerous bugfixes
4731 * The self type parameter in traits is now spelled `Self`
4732 * The `self` parameter in trait and impl methods must now be explicitly
4733 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
4734 * Static methods no longer require the `static` keyword and instead
4735 are distinguished by the lack of a `self` parameter
4736 * Replaced the `Durable` trait with the `'static` lifetime
4737 * The old closure type syntax with the trailing sigil has been
4738 removed in favor of the more consistent leading sigil
4739 * `super` is a keyword, and may be prefixed to paths
4740 * Trait bounds are separated with `+` instead of whitespace
4741 * Traits are implemented with `impl Trait for Type`
4742 instead of `impl Type: Trait`
4743 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
4744 * The `export` keyword has finally been removed
4745 * The `move` keyword has been removed (see "Semantic changes")
4746 * The interior mutability qualifier on vectors, `[mut T]`, has been
4747 removed. Use `&mut [T]`, etc.
4748 * `mut` is no longer valid in `~mut T`. Use inherited mutability
4749 * `fail` is no longer a keyword. Use `fail!()`
4750 * `assert` is no longer a keyword. Use `assert!()`
4751 * `log` is no longer a keyword. use `debug!`, etc.
4752 * 1-tuples may be represented as `(T,)`
4753 * Struct fields may no longer be `mut`. Use inherited mutability,
4754 `@mut T`, `core::mut` or `core::cell`
4755 * `extern mod { ... }` is no longer valid syntax for foreign
4756 function modules. Use extern blocks: `extern { ... }`
4757 * Newtype enums removed. Use tuple-structs.
4758 * Trait implementations no longer support visibility modifiers
4759 * Pattern matching over vectors improved and expanded
4760 * `const` renamed to `static` to correspond to lifetime name,
4761 and make room for future `static mut` unsafe mutable globals.
4762 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
4763 * `Clone` implementations can be automatically generated with
4764 `#[deriving(Clone)]`
4765 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
4766 instead of `foo as Bar`.
4767 * Fixed length vector types are now written as `[int, .. 3]`
4768 instead of `[int * 3]`.
4769 * Fixed length vector types can express the length as a constant
4770 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
4773 * Types with owned pointers or custom destructors move by default,
4774 eliminating the `move` keyword
4775 * All foreign functions are considered unsafe
4776 * &mut is now unaliasable
4777 * Writes to borrowed @mut pointers are prevented dynamically
4779 * The name of the main function can be customized using #[main]
4780 * The default type of an inferred closure is &fn instead of @fn
4781 * `use` statements may no longer be "chained" - they cannot import
4782 identifiers imported by previous `use` statements
4783 * `use` statements are crate relative, importing from the "top"
4784 of the crate by default. Paths may be prefixed with `super::`
4785 or `self::` to change the search behavior.
4786 * Method visibility is inherited from the implementation declaration
4787 * Structural records have been removed
4788 * Many more types can be used in static items, including enums
4789 'static-lifetime pointers and vectors
4790 * Pattern matching over vectors improved and expanded
4791 * Typechecking of closure types has been overhauled to
4792 improve inference and eliminate unsoundness
4793 * Macros leave scope at the end of modules, unless that module is
4794 tagged with #[macro_escape]
4797 * Added big integers to `std::bigint`
4798 * Removed `core::oldcomm` module
4799 * Added pipe-based `core::comm` module
4800 * Numeric traits have been reorganized under `core::num`
4801 * `vec::slice` finally returns a slice
4802 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
4803 * Containers reorganized around traits in `core::container`
4804 * `core::dvec` removed, `~[T]` is a drop-in replacement
4805 * `core::send_map` renamed to `core::hashmap`
4806 * `std::map` removed; replaced with `core::hashmap`
4807 * `std::treemap` reimplemented as an owned balanced tree
4808 * `std::deque` and `std::smallintmap` reimplemented as owned containers
4809 * `core::trie` added as a fast ordered map for integer keys
4810 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
4811 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
4812 overload the comparison operators, whereas `TotalOrd` is used
4813 by certain container types
4816 * Replaced the 'cargo' package manager with 'rustpkg'
4817 * Added all-purpose 'rust' tool
4818 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
4819 * rustc now *attempts* to offer spelling suggestions
4820 * Improved support for ARM and Android
4821 * Preliminary MIPS backend
4822 * Improved foreign function ABI implementation for x86, x86_64
4823 * Various memory usage improvements
4824 * Rust code may be embedded in foreign code under limited circumstances
4825 * Inline assembler supported by new asm!() syntax extension.
4828 Version 0.5 (2012-12-21)
4829 ===========================
4831 * ~900 changes, numerous bugfixes
4834 * Removed `<-` move operator
4835 * Completed the transition from the `#fmt` extension syntax to `fmt!`
4836 * Removed old fixed length vector syntax - `[T]/N`
4837 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
4838 * Macros may now expand to items and statements
4839 * `a.b()` is always parsed as a method call, never as a field projection
4840 * `Eq` and `IterBytes` implementations can be automatically generated
4841 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
4842 * Removed the special crate language for `.rc` files
4843 * Function arguments may consist of any irrefutable pattern
4846 * `&` and `~` pointers may point to objects
4847 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
4848 * Enum variants may be structs
4849 * Destructors can be added to all nominal types with the Drop trait
4850 * Structs and nullary enum variants may be constants
4851 * Values that cannot be implicitly copied are now automatically moved
4852 without writing `move` explicitly
4853 * `&T` may now be coerced to `*T`
4854 * Coercions happen in `let` statements as well as function calls
4855 * `use` statements now take crate-relative paths
4856 * The module and type namespaces have been merged so that static
4857 method names can be resolved under the trait in which they are
4860 * Improved support for language features
4861 * Trait inheritance works in many scenarios
4862 * More support for explicit self arguments in methods - `self`, `&self`
4863 `@self`, and `~self` all generally work as expected
4864 * Static methods work in more situations
4865 * Experimental: Traits may declare default methods for the implementations
4869 * New condition handling system in `core::condition`
4870 * Timsort added to `std::sort`
4871 * New priority queue, `std::priority_queue`
4872 * Pipes for serializable types, `std::flatpipes'
4873 * Serialization overhauled to be trait-based
4874 * Expanded `getopts` definitions
4875 * Moved futures to `std`
4876 * More functions are pure now
4877 * `core::comm` renamed to `oldcomm`. Still deprecated
4878 * `rustdoc` and `cargo` are libraries now
4881 * Added a preliminary REPL, `rusti`
4882 * License changed from MIT to dual MIT/APL2
4885 Version 0.4 (2012-10-15)
4886 ==========================
4888 * ~2000 changes, numerous bugfixes
4891 * All keywords are now strict and may not be used as identifiers anywhere
4892 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
4893 'of', 'with', 'to', 'class'.
4894 * Classes are replaced with simpler structs
4895 * Explicit method self types
4896 * `ret` became `return` and `alt` became `match`
4897 * `import` is now `use`; `use is now `extern mod`
4898 * `extern mod { ... }` is now `extern { ... }`
4899 * `use mod` is the recommended way to import modules
4900 * `pub` and `priv` replace deprecated export lists
4901 * The syntax of `match` pattern arms now uses fat arrow (=>)
4902 * `main` no longer accepts an args vector; use `os::args` instead
4905 * Trait implementations are now coherent, ala Haskell typeclasses
4906 * Trait methods may be static
4907 * Argument modes are deprecated
4908 * Borrowed pointers are much more mature and recommended for use
4909 * Strings and vectors in the static region are stored in constant memory
4910 * Typestate was removed
4911 * Resolution rewritten to be more reliable
4912 * Support for 'dual-mode' data structures (freezing and thawing)
4915 * Most binary operators can now be overloaded via the traits in
4917 * `std::net::url` for representing URLs
4918 * Sendable hash maps in `core::send_map`
4919 * `core::task' gained a (currently unsafe) task-local storage API
4922 * An efficient new intertask communication primitive called the pipe,
4923 along with a number of higher-level channel types, in `core::pipes`
4924 * `std::arc`, an atomically reference counted, immutable, shared memory
4926 * `std::sync`, various exotic synchronization tools based on arcs and pipes
4927 * Futures are now based on pipes and sendable
4928 * More robust linked task failure
4929 * Improved task builder API
4932 * Improved error reporting
4933 * Preliminary JIT support
4934 * Preliminary work on precise GC
4935 * Extensive architectural improvements to rustc
4936 * Begun a transition away from buggy C++-based reflection (shape) code to
4937 Rust-based (visitor) code
4938 * All hash functions and tables converted to secure, randomized SipHash
4941 Version 0.3 (2012-07-12)
4942 ========================
4944 * ~1900 changes, numerous bugfixes
4946 * New coding conveniences
4947 * Integer-literal suffix inference
4948 * Per-item control over warnings, errors
4949 * #[cfg(windows)] and #[cfg(unix)] attributes
4950 * Documentation comments
4951 * More compact closure syntax
4952 * 'do' expressions for treating higher-order functions as
4954 * *-patterns (wildcard extended to all constructor fields)
4957 * Name resolution pass and exhaustiveness checker rewritten
4958 * Region pointers and borrow checking supersede alias
4960 * Init-ness checking is now provided by a region-based liveness
4961 pass instead of the typestate pass; same for last-use analysis
4962 * Extensive work on region pointers
4964 * Experimental new language features
4965 * Slices and fixed-size, interior-allocated vectors
4966 * #!-comments for lang versioning, shell execution
4967 * Destructors and iface implementation for classes;
4968 type-parameterized classes and class methods
4969 * 'const' type kind for types that can be used to implement
4970 shared-memory concurrency patterns
4974 * Removal of various obsolete features
4975 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
4976 'crust', 'native' (now 'extern'), 'cont' (now 'again')
4978 * Constructs: do-while loops ('do' repurposed), fn binding,
4979 resources (replaced by destructors)
4981 * Compiler reorganization
4982 * Syntax-layer of compiler split into separate crate
4983 * Clang (from LLVM project) integrated into build
4984 * Typechecker split into sub-modules
4987 * New time functions
4988 * Extension methods for many built-in types
4989 * Arc: atomic-refcount read-only / exclusive-use shared cells
4990 * Par: parallel map and search routines
4991 * Extensive work on libuv interface
4992 * Much vector code moved to libraries
4993 * Syntax extensions: #line, #col, #file, #mod, #stringify,
4994 #include, #include_str, #include_bin
4997 * Cargo automatically resolves dependencies
5000 Version 0.2 (2012-03-29)
5001 =========================
5003 * >1500 changes, numerous bugfixes
5005 * New docs and doc tooling
5007 * New port: FreeBSD x86_64
5009 * Compilation model enhancements
5010 * Generics now specialized, multiply instantiated
5011 * Functions now inlined across separate crates
5013 * Scheduling, stack and threading fixes
5014 * Noticeably improved message-passing performance
5015 * Explicit schedulers
5019 * Experimental new language features
5020 * Operator overloading
5024 * Various language extensions
5025 * C-callback function types: 'crust fn ...'
5026 * Infinite-loop construct: 'loop { ... }'
5027 * Shorten 'mutable' to 'mut'
5028 * Required mutable-local qualifier: 'let mut ...'
5029 * Basic glob-exporting: 'export foo::*;'
5030 * Alt now exhaustive, 'alt check' for runtime-checked
5031 * Block-function form of 'for' loop, with 'break' and 'ret'.
5034 * AST quasi-quote syntax extension
5035 * Revived libuv interface
5036 * New modules: core::{future, iter}, std::arena
5037 * Merged per-platform std::{os*, fs*} to core::{libc, os}
5038 * Extensive cleanup, regularization in libstd, libcore
5041 Version 0.1 (2012-01-20)
5042 ===============================
5044 * Most language features work, including:
5045 * Unique pointers, unique closures, move semantics
5046 * Interface-constrained generics
5047 * Static interface dispatch
5049 * Multithread task scheduling
5050 * Typestate predicates
5051 * Failure unwinding, destructors
5052 * Pattern matching and destructuring assignment
5053 * Lightweight block-lambda syntax
5054 * Preliminary macro-by-example
5056 * Compiler works with the following configurations:
5057 * Linux: x86 and x86_64 hosts and targets
5058 * macOS: x86 and x86_64 hosts and targets
5059 * Windows: x86 hosts and targets
5061 * Cross compilation / multi-target configuration supported.
5063 * Preliminary API-documentation and package-management tools included.
5067 * Documentation is incomplete.
5069 * Performance is below intended target.
5071 * Standard library APIs are subject to extensive change, reorganization.
5073 * Language-level versioning is not yet operational - future code will