Auto merge of #44481 - Aaronepower:master, r=alexcrichton
Updated RELEASES.md for 1.21.0 [Rendered](https://github.com/Aaronepower/rust/blob/master/RELEASES.md)
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RELEASES.md
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RELEASES.md
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Version 1.21.0 (2017-10-12)
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==========================
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Language
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--------
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- [Relaxed path syntax. You can now add type parameters to values][43540]
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Example:
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```rust
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my_macro!(Vec<i32>::new); // Always worked
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my_macro!(Vec::<i32>::new); // Now works
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```
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- [You can now use static references for literals.][43838]
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Example:
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```rust
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fn main() {
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let x: &'static u32 = &0;
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}
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```
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Compiler
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--------
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- [Upgraded jemalloc to 4.5.0][43911]
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- [Enabled unwinding panics on Redox][43917]
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- [Now runs LLVM in parallel during translation phase.][43506]
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This should reduce peak memory usage.
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Libraries
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---------
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- [Generate builtin impls for `Clone` for all arrays and tuples that
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are `T: Clone`][43690]
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- [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
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- [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
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`From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
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Stabilized APIs
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---------------
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[`std::mem::discriminant`]
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Cargo
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-----
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- [You can now call `cargo install` with multiple package names][cargo/4216]
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- [Cargo commands inside a virtual workspace will now implicitly
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pass `--all`][cargo/4335]
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- [Added a `[patch]` section to `Cargo.toml` to handle
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prepublication dependencies][cargo/4123] [RFC 1969]
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- [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
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like patterns][cargo/4270]
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- [Added the `--all-targets` option][cargo/4400]
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- [Using required dependencies as a feature is now deprecated and emits
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a warning][cargo/4364]
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Misc
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----
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- [Cargo docs are moving][43916]
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to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
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- [The rustdoc book is now available][43863]
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at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
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- [Added a preview of RLS has been made available through rustup][44204]
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Install with `rustup component add rls-preview`
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- [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
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Previously only showed `std::os::unix`.
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Compatibility Notes
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-------------------
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- [Changes in method matching against higher-ranked types][43880] This may cause
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breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
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- [rustc's JSON error output's byte position start at top of file.][42973]
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Was previously relative to the rustc's internal `CodeMap` struct which
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required the unstable library `libsyntax` to correctly use.
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- [`unused_results` lint no longer ignores booleans][43728]
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[42565]: https://github.com/rust-lang/rust/pull/42565
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[42973]: https://github.com/rust-lang/rust/pull/42973
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[43348]: https://github.com/rust-lang/rust/pull/43348
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[43459]: https://github.com/rust-lang/rust/pull/43459
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[43506]: https://github.com/rust-lang/rust/pull/43506
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[43540]: https://github.com/rust-lang/rust/pull/43540
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[43690]: https://github.com/rust-lang/rust/pull/43690
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[43728]: https://github.com/rust-lang/rust/pull/43728
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[43838]: https://github.com/rust-lang/rust/pull/43838
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[43863]: https://github.com/rust-lang/rust/pull/43863
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[43880]: https://github.com/rust-lang/rust/pull/43880
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[43911]: https://github.com/rust-lang/rust/pull/43911
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[43916]: https://github.com/rust-lang/rust/pull/43916
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[43917]: https://github.com/rust-lang/rust/pull/43917
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[44204]: https://github.com/rust-lang/rust/pull/44204
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[cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
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[cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
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[cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
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[cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
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[cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
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[cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
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[RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
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[info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
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[`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
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Version 1.20.0 (2017-08-31)
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===========================
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@ -110,7 +208,7 @@ Compatibility Notes
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- [Functions with `'static` in their return types will now not be as usable as
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if they were using lifetime parameters instead.][42417]
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- [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
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takes the sign of NaN into account where previously didn't.][42430]
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takes the sign of NaN into account where previously didn't.][42430]
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[42033]: https://github.com/rust-lang/rust/pull/42033
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[42155]: https://github.com/rust-lang/rust/pull/42155
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