This is absolutely true, and I completely agree. When I'm writing code related to git, I have lots of 'repo and 'tree lifetimes, and I think that's much more re

This is absolutely true, and I completely agree. When I'm writing code related to git, I have lots of 'repo and 'tree lifetimes, and I think that's much more readable than 'a and 'b. I think it'd be a really good idea for the standard library to change many of its lifetimes to be descriptive, to encourage others to do the same. With my libs-api team hat on, I'd happily merge PRs that do that. (In small batches, please, not the whole library at once.)