Over-long lists in pattern match coverage check
I'm seeing a lot of this
WARNING: file compiler/utils/Util.hs, line 593 Over-long elem in unionLists Call stack: CallStack (from HasCallStack): callStackDoc, called at compiler/utils/Outputable.hs:1294:29 in ghc:Outputable warnPprTrace, called at compiler/utils/Util.hs:593:20 in ghc:Util isIn, called at compiler/utils/ListSetOps.hs:64:5 in ghc:ListSetOps unionLists, called at compiler/GHC/HsToCore/PmCheck/Oracle.hs:940:36 in ghc:GHC.HsToCore.PmCheck.Oracle
E.g. when compiling Cabal.
Something is bad in
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