Add suggestion to borrow Fn
and FnMut
params/opaque/closures instead of move
#95257
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I think that Closure/ParamTy/Opaque are all "opaque" enough that it's meaningful to suggest borrowing them instead of moving them at their usage sites when we see a move error. See the attached issue for example.
Is this suggestion too general? I could perhaps use the move site information to limit this to places like fn calls, but I don't know enough about mir borrowck to know if that's an easy change.
Fixes #90828