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Ningning Xie authored
An attempt on #14975: During compilation, reflexive casts is discarded for computation. Currently in some places we use Maybe coercion as inputs. So if a cast is reflexive it is denoted as Nothing, otherwise Just coercion. This patch defines the type data MCoercion = MRefl | MCo Coercion which is isomorphic to Maybe Coercion but useful in a number of places, and super-helpful documentation. Test Plan: validate Reviewers: bgamari, goldfire, simonpj Reviewed By: goldfire Subscribers: mpickering, rwbarton, thomie, carter GHC Trac Issues: #14975 Differential Revision: https://phabricator.haskell.org/D4699
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