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1.14 release notes #38427

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1.14 release notes
brson Dec 17, 2016
2afadaa
Edits. More platform support
brson Dec 17, 2016
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219 changes: 219 additions & 0 deletions RELEASES.md
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Version 1.14.0 (2016-12-22)
===========================

Language
--------

* [`..` matches multiple tuple fields in enum variants, structs
and tuples][36843]. [RFC 1492].
* [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
* [`use *` and `use ::*` both glob-import from the crate root][37367]
* [It's now possible to call a `Vec<Box<Fn()>>` without explicit
dereferencing][36822]

Compiler
--------

* [Mark enums with non-zero discriminant as non-zero][37224]
* [Lower-case `static mut` names are linted like other
statics and consts][37162]
* [Fix ICE on some macros in const integer positions
(e.g. `[u8; m!()]`)][36819]
* [Improve error message and snippet for "did you mean `x`"][36798]
* [Add a panic-strategy field to the target specification][36794]
* [Include LLVM version in `--version --verbose`][37200]

Compile-time Optimizations
--------------------------

* [Improve macro expansion performance][37569]
* [Shrink `Expr_::ExprInlineAsm`][37445]
* [Replace all uses of SHA-256 with BLAKE2b][37439]
* [Reduce the number of bytes hashed by `IchHasher`][37427]
* [Avoid more allocations when compiling html5ever][37373]
* [Use `SmallVector` in `CombineFields::instantiate`][37322]
* [Avoid some allocations in the macro parser][37318]
* [Use a faster deflate setting][37298]
* [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
during interning of slices][37270]
* [Optimize `write_metadata`][37267]
* [Don't process obligation forest cycles when stalled][37231]
* [Avoid many `CrateConfig` clones][37161]
* [Optimize `Substs::super_fold_with`][37108]
* [Optimize `ObligationForest`'s `NodeState` handling][36993]
* [Speed up `plug_leaks`][36917]

Libraries
---------

* [`println!()`, with no arguments, prints newline][36825].
Previously, an empty string was required to achieve the same.
* [`Wrapping` impls standard binary and unary operators, as well as
the `Sum` and `Product` iterators][37356]
* [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
Vec<T>`][37326]
* [Improve `fold` performance for `chain`, `cloned`, `map`, and
`VecDeque` iterators][37315]
* [Improve `SipHasher` performance on small values][37312]
* [Add Iterator trait TrustedLen to enable better FromIterator /
Extend][37306]
* [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
* [`ReadDir` implements `Debug`][37221]
* [Implement `RefUnwindSafe` for atomic types][37178]
* [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
* [Avoid allocations in `Decoder::read_str`][37064]
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@sinkuu sinkuu Dec 21, 2016 •
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Isn't this more like a compile-time optimization?

* [`io::Error` implements `From<io::ErrorKind>`][37037]
* [Impl `Debug` for raw pointers to unsized data][36880]
* [Don't reuse `HashMap` random seeds][37470]
* [The internal memory layout of `HashMap` is more cache-friendly, for
significant improvements in some operations][36692]
* [`HashMap` uses less memory on 32-bit architectures][36595]
* [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]

Cargo
-----

* [Expose rustc cfg values to build scripts][cargo/3243]
* [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
* [Fix passing --features when testing multiple packages][cargo/3280]
* [Use a single profile set per workspace][cargo/3249]
* [Load `replace` sections from lock files][cargo/3220]
* [Ignore `panic` configuration for test/bench profiles][cargo/3175]

Tooling
-------

* [rustup is the recommended Rust installation method][1.14rustup]
* This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
S390x. These are [tier 2] platforms and may have major defects. Follow the
instructions on the website to install, or add the targets to an existing
installation with `rustup target add`. The new target triples are:
- `mips-unknown-linux-gnu`
- `mipsel-unknown-linux-gnu`
- `mips64-unknown-linux-gnuabi64`
- `mips64el-unknown-linux-gnuabi64 `
- `powerpc-unknown-linux-gnu`
- `powerpc64-unknown-linux-gnu`
- `powerpc64le-unknown-linux-gnu`
- `s390x-unknown-linux-gnu `
* This release includes target (std) builds for ARM Linux running MUSL
libc. These are [tier 2] platforms and may have major defects. Add the
following triples to an existing rustup installation with `rustup target add`:
- `arm-unknown-linux-musleabi`
- `arm-unknown-linux-musleabihf`
- `armv7-unknown-linux-musleabihf`
* This release includes [experimental support for WebAssembly][1.14wasm], via
the `wasm32-unknown-emscripten` target. This target is known to have major
defects. Please test, report, and fix.
* rustup no longer installs documentation by default. Run `rustup
component add rust-docs` to install.
* [Fix line stepping in debugger][37310]
* [Enable line number debuginfo in releases][37280]

Misc
----

* [Disable jemalloc on aarch64/powerpc/mips][37392]
* [Add support for Fuchsia OS][37313]
* [Detect local-rebuild by only MAJOR.MINOR version][37273]

Compatibility Notes
-------------------

* [A number of forward-compatibility lints used by the compiler
to gradually introduce language changes have been converted
to deny by default][36894]:
- ["use of inaccessible extern crate erroneously allowed"][36886]
- ["type parameter default erroneously allowed in invalid location"][36887]
- ["detects super or self keywords at the beginning of global path"][36888]
- ["two overlapping inherent impls define an item with the same name
were erroneously allowed"][36889]
- ["floating-point constants cannot be used in patterns"][36890]
- ["constants of struct or enum type can only be used in a pattern if
the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
- ["lifetimes or labels named `'_` were erroneously allowed"][36892]
* [Prohibit patterns in trait methods without bodies][37378]
* [The atomic `Ordering` enum may not be matched exhaustively][37351]
* [Future-proofing `#[no_link]` breaks some obscure cases][37247]
* [The `$crate` macro variable is accepted in fewer locations][37213]
* [Impls specifying extra region requirements beyond the trait
they implement are rejected][37167]
* [Enums may not be unsized][37111]. Unsized enums are intended to
work but never have. For now they are forbidden.
* [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]

[tier 2]: https://forge.rust-lang.org/platform-support.html
[1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
[1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
[36430]: https://github.com/rust-lang/rust/pull/36430
[36595]: https://github.com/rust-lang/rust/pull/36595
[36595]: https://github.com/rust-lang/rust/pull/36595
[36692]: https://github.com/rust-lang/rust/pull/36692
[36767]: https://github.com/rust-lang/rust/pull/36767
[36794]: https://github.com/rust-lang/rust/pull/36794
[36798]: https://github.com/rust-lang/rust/pull/36798
[36819]: https://github.com/rust-lang/rust/pull/36819
[36822]: https://github.com/rust-lang/rust/pull/36822
[36825]: https://github.com/rust-lang/rust/pull/36825
[36843]: https://github.com/rust-lang/rust/pull/36843
[36880]: https://github.com/rust-lang/rust/pull/36880
[36886]: https://github.com/rust-lang/rust/issues/36886
[36887]: https://github.com/rust-lang/rust/issues/36887
[36888]: https://github.com/rust-lang/rust/issues/36888
[36889]: https://github.com/rust-lang/rust/issues/36889
[36890]: https://github.com/rust-lang/rust/issues/36890
[36891]: https://github.com/rust-lang/rust/issues/36891
[36892]: https://github.com/rust-lang/rust/issues/36892
[36894]: https://github.com/rust-lang/rust/pull/36894
[36917]: https://github.com/rust-lang/rust/pull/36917
[36993]: https://github.com/rust-lang/rust/pull/36993
[37037]: https://github.com/rust-lang/rust/pull/37037
[37064]: https://github.com/rust-lang/rust/pull/37064
[37094]: https://github.com/rust-lang/rust/pull/37094
[37108]: https://github.com/rust-lang/rust/pull/37108
[37111]: https://github.com/rust-lang/rust/pull/37111
[37161]: https://github.com/rust-lang/rust/pull/37161
[37162]: https://github.com/rust-lang/rust/pull/37162
[37167]: https://github.com/rust-lang/rust/pull/37167
[37178]: https://github.com/rust-lang/rust/pull/37178
[37200]: https://github.com/rust-lang/rust/pull/37200
[37213]: https://github.com/rust-lang/rust/pull/37213
[37221]: https://github.com/rust-lang/rust/pull/37221
[37224]: https://github.com/rust-lang/rust/pull/37224
[37230]: https://github.com/rust-lang/rust/pull/37230
[37231]: https://github.com/rust-lang/rust/pull/37231
[37247]: https://github.com/rust-lang/rust/pull/37247
[37267]: https://github.com/rust-lang/rust/pull/37267
[37270]: https://github.com/rust-lang/rust/pull/37270
[37273]: https://github.com/rust-lang/rust/pull/37273
[37280]: https://github.com/rust-lang/rust/pull/37280
[37298]: https://github.com/rust-lang/rust/pull/37298
[37306]: https://github.com/rust-lang/rust/pull/37306
[37310]: https://github.com/rust-lang/rust/pull/37310
[37312]: https://github.com/rust-lang/rust/pull/37312
[37313]: https://github.com/rust-lang/rust/pull/37313
[37315]: https://github.com/rust-lang/rust/pull/37315
[37318]: https://github.com/rust-lang/rust/pull/37318
[37322]: https://github.com/rust-lang/rust/pull/37322
[37326]: https://github.com/rust-lang/rust/pull/37326
[37351]: https://github.com/rust-lang/rust/pull/37351
[37356]: https://github.com/rust-lang/rust/pull/37356
[37367]: https://github.com/rust-lang/rust/pull/37367
[37373]: https://github.com/rust-lang/rust/pull/37373
[37378]: https://github.com/rust-lang/rust/pull/37378
[37389]: https://github.com/rust-lang/rust/pull/37389
[37392]: https://github.com/rust-lang/rust/pull/37392
[37427]: https://github.com/rust-lang/rust/pull/37427
[37439]: https://github.com/rust-lang/rust/pull/37439
[37445]: https://github.com/rust-lang/rust/pull/37445
[37470]: https://github.com/rust-lang/rust/pull/37470
[37569]: https://github.com/rust-lang/rust/pull/37569
[RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
[cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
[cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
[cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
[cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
[cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
[cargo/3280]: https://github.com/rust-lang/cargo/pull/3280


Version 1.13.0 (2016-11-10)
===========================

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