Misc cleanup (!2848) · Merge requests · Glasgow Haskell Compiler / GHC · GitLab

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Krzysztof Gogolewski requested to merge tweag/ghc:wip/misc-cleanup into master Mar 09, 2020

Remove Note [Existentials in shift_con_pat]. The function shift_con_pat has been removed 15 years ago in 23f40f0e.
Remove kcLookupTcTyCon - it's the same as tcLookupTcTyCon
Remove ASSERT in tyConAppArgN. The function getNth is the same as (!!) except it checks exactly this assertion.
Remove unused function nextRole