Stabilize rvalue promotion to 'static. #43838
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Stabilize rvalue promotion to 'static. Closes #38865. Documentation PR at rust-lang/reference#98.
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Changelog:
Version 1.21.0 (2017-10-12)
==========================
Language
--------
- [You can now use static references for literals.][43838]
Example:
```rust
fn main() {
let x: &'static u32 = &0;
}
```
- [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
Example:
```rust
my_macro!(Vec<i32>::new); // Always worked
my_macro!(Vec::<i32>::new); // Now works
```
Compiler
--------
- [Upgraded jemalloc to 4.5.0][43911]
- [Enabled unwinding panics on Redox][43917]
- [Now runs LLVM in parallel during translation phase.][43506]
This should reduce peak memory usage.
Libraries
---------
- [Generate builtin impls for `Clone` for all arrays and tuples that
are `T: Clone`][43690]
- [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
- [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
`From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
Stabilized APIs
---------------
[`std::mem::discriminant`]
Cargo
-----
- [You can now call `cargo install` with multiple package names][cargo/4216]
- [Cargo commands inside a virtual workspace will now implicitly
pass `--all`][cargo/4335]
- [Added a `[patch]` section to `Cargo.toml` to handle
prepublication dependencies][cargo/4123] [RFC 1969]
- [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
like patterns][cargo/4270]
- [Added the `--all-targets` option][cargo/4400]
- [Using required dependencies as a feature is now deprecated and emits
a warning][cargo/4364]
Misc
----
- [Cargo docs are moving][43916]
to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
- [The rustdoc book is now available][43863]
at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
- [Added a preview of RLS has been made available through rustup][44204]
Install with `rustup component add rls-preview`
- [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
Previously only showed `std::os::unix`.
Compatibility Notes
-------------------
- [Changes in method matching against higher-ranked types][43880] This may cause
breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
- [rustc's JSON error output's byte position start at top of file.][42973]
Was previously relative to the rustc's internal `CodeMap` struct which
required the unstable library `libsyntax` to correctly use.
- [`unused_results` lint no longer ignores booleans][43728]
[42565]: rust-lang/rust#42565
[42973]: rust-lang/rust#42973
[43348]: rust-lang/rust#43348
[43459]: rust-lang/rust#43459
[43506]: rust-lang/rust#43506
[43540]: rust-lang/rust#43540
[43690]: rust-lang/rust#43690
[43728]: rust-lang/rust#43728
[43838]: rust-lang/rust#43838
[43863]: rust-lang/rust#43863
[43880]: rust-lang/rust#43880
[43911]: rust-lang/rust#43911
[43916]: rust-lang/rust#43916
[43917]: rust-lang/rust#43917
[44204]: rust-lang/rust#44204
[cargo/4123]: rust-lang/cargo#4123
[cargo/4216]: rust-lang/cargo#4216
[cargo/4270]: rust-lang/cargo#4270
[cargo/4335]: rust-lang/cargo#4335
[cargo/4364]: rust-lang/cargo#4364
[cargo/4400]: rust-lang/cargo#4400
[RFC 1969]: rust-lang/rfcs#1969
[info/43880]: rust-lang/rust#44224 (comment)
[`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
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Closes #38865.
Documentation PR at rust-lang/reference#98.