Rustacean Station What's New in Rust 1.79 and 1.80
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May 10, 2025 Discover the exciting new features introduced in Rust 1.79 and 1.80! The discussion highlights inline constant expressions and enhancements to global variables, boosting readability and resource management. Delve into frame pointers for improved debugging and the stabilization of unchecked arithmetic for optimized performance. Learn about advancements in string processing, including UTF-8 handling and new methods for slices. Don't miss the introduction of lazy initialization types and exclusive ranges in pattern matching, enhancing developer efficiency!
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Inline Const Expressions Expanded
- Inline const expressions can now be used anywhere an expression is expected, including generic contexts.
- This allows const values to depend on generic parameters, each instantiation generates a specialized const.
Bounds on Associated Types
- You can now declare bounds on associated types inline with trait bounds.
- This improves readability and allows super traits to convey tighter constraints.
Extended Temporary Lifetime Extension
- Automatic temporary lifetime extension is expanded to include references to temporaries returned from if and match branches.
- This enables returning references to temporaries from branching expressions safely.