- Added several language and library features, such as cfg attributes on generic parameters, enum variants via type aliases, const identifier usage, repr(align) on enums, the ? operator in the 2015 edition, and many new std APIs (e.g., Buf...
- Enabled Profile Guided Optimization in the compiler and restored the rust-lldb wrapper script; Cargo now includes Cargo.lock by default for executable crates and allows specifying a default run target, with new lint warnings for inclusiv...
Rust 1.37.0
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Language: allow shortening lifetimes of &mut during unsize coercions and introduce new lints for invalid runtime symbols and c void return types.