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For
{Hash, BTree}Map::insert
, I always have to take a few extra seconds to think about the slight weirdness about the fact that if we "did not" insert (which "sounds" false), we return true, and if we "did" insert, (which "sounds" true), we return false.This tweaks the doc comments for the
insert
methods of those types (as well as what looks like a rustc internal data structure that I found just by searching the codebase for "If the set did") to first use the "Returns whether something" pattern used in e.g.remove
, where we say thatremove
"returns whether the value was present".