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Rust 1.22.0

Released on November 22, 2017

What's Changed

  • [non_snake_case lint now allows extern no-mangle functions][44966]
  • [Now accepts underscores in unicode escapes][43716]
  • [T op= &T now works for numeric types.][44287] eg. let mut x = 2; x += &8;
  • [types that impl Drop are now allowed in const and static types][44456]

  • [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
  • [rustc will no longer inline in codegen units when compiling for debug][45075]
  • [strict memory alignment now enabled on ARMv6][45094]
  • [Remove support for the PNaCl target le32-unknown-nacl][45041]

  • [Allow atomic operations up to 32 bits
  • [Box now impls From>][44466]
  • [std::mem::Discriminant is now guaranteed to be Send + Sync][45095]
  • [fs::copy now returns the length of the main stream on NTFS.][44895]
  • [Properly detect overflow in Instant += Duration.][44220]
  • [impl Hasher for {&mut Hasher, Box}][44015]
  • [impl fmt::Debug for SplitWhitespace.][44303]
  • [Option now impls Try][42526] This allows for using ? with Option types.

  • [Cargo will now build multi file examples in subdirectories of the examples
  • [Changed [root] to [package] in Cargo.lock][cargo/4571] Packages with
  • [Now supports vendoring git repositories][cargo/3992]

  • [The minimum Android version that rustc can build for has been bumped
  • [Allowing T op= &T for numeric types has broken some type

  • [libbacktrace is now available on Apple platforms.][44251]
  • [Stabilised the compile_fail attribute for code fences in doc-comments.][43949]
Full Changelog

Language

--------

- [non_snake_case lint now allows extern no-mangle functions][44966]

- [Now accepts underscores in unicode escapes][43716]

- [T op= &T now works for numeric types.][44287] eg. let mut x = 2; x += &8;

- [types that impl Drop are now allowed in const and static types][44456]

Compiler

--------

- [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]

- [rustc will no longer inline in codegen units when compiling for debug][45075]

This should decrease compile times for debug builds.

- [strict memory alignment now enabled on ARMv6][45094]

- [Remove support for the PNaCl target le32-unknown-nacl][45041]

Libraries

---------

- [Allow atomic operations up to 32 bits

on armv5te_unknown_linux_gnueabi][44978]

- [Box now impls From>][44466]

- [std::mem::Discriminant is now guaranteed to be Send + Sync][45095]

- [fs::copy now returns the length of the main stream on NTFS.][44895]

- [Properly detect overflow in Instant += Duration.][44220]

- [impl Hasher for {&mut Hasher, Box}][44015]

- [impl fmt::Debug for SplitWhitespace.][44303]

- [Option now impls Try][42526] This allows for using ? with Option types.

Stabilized APIs

---------------

Cargo

-----

- [Cargo will now build multi file examples in subdirectories of the examples

folder that have a main.rs file.][cargo/4496]

- [Changed [root] to [package] in Cargo.lock][cargo/4571] Packages with

the old format will continue to work and can be updated with cargo update.

- [Now supports vendoring git repositories][cargo/3992]

Misc

----

- [libbacktrace is now available on Apple platforms.][44251]

- [Stabilised the compile_fail attribute for code fences in doc-comments.][43949]

This now lets you specify that a given code example will fail to compile.

Compatibility Notes

-------------------

- [The minimum Android version that rustc can build for has been bumped

to 4.0 from 2.3][45656]

- [Allowing T op= &T for numeric types has broken some type

inference cases][45480]

[42526]: https://github.com/rust-lang/rust/pull/42526

[43716]: https://github.com/rust-lang/rust/pull/43716

[43949]: https://github.com/rust-lang/rust/pull/43949

[44015]: https://github.com/rust-lang/rust/pull/44015

[44220]: https://github.com/rust-lang/rust/pull/44220

[44251]: https://github.com/rust-lang/rust/pull/44251

[44287]: https://github.com/rust-lang/rust/pull/44287

[44303]: https://github.com/rust-lang/rust/pull/44303

[44456]: https://github.com/rust-lang/rust/pull/44456

[44466]: https://github.com/rust-lang/rust/pull/44466

[44895]: https://github.com/rust-lang/rust/pull/44895

[44966]: https://github.com/rust-lang/rust/pull/44966

[44978]: https://github.com/rust-lang/rust/pull/44978

[45041]: https://github.com/rust-lang/rust/pull/45041

[45064]: https://github.com/rust-lang/rust/pull/45064

[45075]: https://github.com/rust-lang/rust/pull/45075

[45094]: https://github.com/rust-lang/rust/pull/45094

[45095]: https://github.com/rust-lang/rust/pull/45095

[45480]: https://github.com/rust-lang/rust/issues/45480

[45656]: https://github.com/rust-lang/rust/pull/45656

[cargo/3992]: https://github.com/rust-lang/cargo/pull/3992

[cargo/4496]: https://github.com/rust-lang/cargo/pull/4496

[cargo/4571]: https://github.com/rust-lang/cargo/pull/4571