-- Finally the ones that are sure to succeed, or which are covered by the checking algorithm
might_fail_pat (LazyPat _) = False -- Always succeeds
-might_fail_pat _ = False -- VarPat, WildPat, LitPat, NPat, TypePat
+might_fail_pat _ = False -- VarPat, WildPat, LitPat, NPat
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might_fail_lpat :: LPat Id -> Bool