- Added const support for tuple structs, tuple enum variant constructors, and the is_power_of_two method on unsigned types.
- Extended procedural macro capabilities: function‑like macros in extern blocks/type positions, macros can emit macro_rules items, and improved meta pattern matching.
- Introduced breaking changes such as turning previous NLL warnings in the 2015 edition into hard errors and stricter inline attribute linting.
Rust 1.40.0
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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.