* [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>`][36595]
+* [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
Cargo
-----
-------
* [rustup is the recommended Rust installation method][1.14rustup]
-* This release includes [experimental support for WebAssembly][1.14wasm]
-* This release includes builds for ARM Linux running MUSL libc. Add the
- `arm-unknown-linux-musleabi`, `arm-unknown-linux-musleabihf`, and
- `armv7-unknown-linux-musleabihf` targets via `rustup target add`.
+* 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]
Misc
----
-* [Disable jemalloc on aarch64/powerpc][37392]
+* [Disable jemalloc on aarch64/powerpc/mips][37392]
* [Add support for Fuchsia OS][37313]
* [Detect local-rebuild by only MAJOR.MINOR version][37273]
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