rust - https://github.com/rust-lang/rust

Age	Commit message (Collapse)	Author	Lines
2013-04-12	libsyntax: short-circuit on non-matching variants in deriving code.	Huon Wilson	-0/+52
	Allow a deriving instance using the generic code to short-circuit for any non-matching enum variants (grouping them all into a _ match), reducing the number of arms required. Use this to speed up the Eq & TotalEq implementations.