Auto merge of #38427 - brson:relnotes, r=alexcrichton

1.14 release notes

[Rendered](https://github.com/brson/rust/blob/relnotes/RELEASES.md).

Is there anything I'm missing? Were there any library stabilizations?

The most interesting thing this time seems to be rustup, then compile time opts, `..` matches, cargo exposing `cfg` values to build scripts. This release also has wasm support, but it's pretty rough. Might be worth hyping up all the same. ARM MUSL targets.

There are a large number of compatibility notes. Might be worth talking about that.

Relevant prlo links: goo.gl/PGz2Ds, goo.gl/KV23Qv, goo.gl/g7ku6D.

RELEASES.md

@@ -1,3 +1,222 @@
+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]
+* [`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)
 ===========================