An editor feature I'd like is that as I'm typing an identifier, a hover popup shows me how many other instances appear in my codebase. It should be easy to buil

An editor feature I'd like is that as I'm typing an identifier, a hover popup shows me how many other instances appear in my codebase. It should be easy to build a map of identifier->count for instant lookups. I generally know if I want 0 (a new unique identifier), 1, a small number, or a large number. For a few pixels, this would prevent a lot of dumb mistakes and ambiguous names.