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regex
An implementation of regular expressions for Rust. This implementation uses finite automata and guarantees linear time matching on all inputs.
Here is the original GitHub issue on the question:
https://github.com/rust-lang/rust/issues/15699
Intuitively, the bottom lifetime should the one that is uninhabited, which would be a lifetime with no extent rather than 'static.
burntsushi actually regrets making regex replace return a Cow: https://github.com/rust-lang/regex/issues/676#issuecomment-6.... I’m glad it does, and wish it took an impl Into> there, for the reasons discussed in the issue, but burntsushi has a lot more experience of the practical outcomes of this. Just something more to think about.