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Convert diagnostics in GHC.Rename.Bind to proper TcRnMessage (#20115)

Andrei Borzenkov requested to merge sand-witch/ghc:Player205/#20115-GHC.Rename.Bind-struct-errors into master

I removed all occurrences of TcRnUnknkownMessage in GHC.Rename.Bind.

The following TcRnMessage messages were introduced:

  • TcRnMultipleFixityDecls
  • TcRnIllegalPatternSynonymDecl
  • TcRnIllegalClassBiding
  • TcRnOrphanCompletePragma
  • TcRnEmptyCase
  • TcRnNonStdGuards
  • TcRnDuplicateSigDecl
  • TcRnMisplacedSigDecl
  • TcRnUnexpectedDefaultSig
  • TcRnBindInBootFile
  • TcRnDuplicateMinimalSig

I also created two helper types: NonStandardGuards and DeclSort and one new test: RnPatternSynonymFail.

Edited by Andrei Borzenkov

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