Commit 30f5ac07 authored by Committed by Marge Bot
Much simpler language for PmCheck
Simon realised that the simple language composed of let bindings, bang patterns and flat constructor patterns is enough to capture the semantics of the source pattern language that are important for pattern-match checking. Well, given that the Oracle is smart enough to connect the dots in this less informationally dense form, which it is now. So we transform `translatePat` to return a list of `PmGrd`s relative to an incoming match variable. `pmCheck` then trivially translates each of the `PmGrd`s into constraints that the oracle understands. Since we pass in the match variable, we incidentally fix #15884 (coverage checks for view patterns) through an interaction with !1746.
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