Highlights of Rust 1.21 include:
- Documentation improvements.
- Rust now runs LLVM in parallel for code generation and should lower the peak RAM usage.
- Continued work on library stabilizations though mostly minor this cycle.
- Cargo gains support for a new [patch] section to override parts of a package's dependency graph.
- cargo install can now support installing multiple crates at once.
More details on the Rust 1.21 update via the detailed writeup at Rust-Lang.org.
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