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Commit ca90ffa3 authored by Richard Eisenberg's avatar Richard Eisenberg Committed by Marge Bot
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Use local instances with least superclass depth 

See new Note [Use only the best local instance] in
GHC.Tc.Solver.Interact.

This commit also refactors the InstSC/OtherSC mechanism
slightly.

Close #20582.
parent 265ead8a
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