Simon Peyton Jones authored May 31, 2020 and Marge Bot committed Jun 01, 2020

GHC.Hs.Extension had

  type GhcPs   = GhcPass 'Parsed
  type GhcRn   = GhcPass 'Renamed
  type GhcTc   = GhcPass 'Typechecked
  type GhcTcId = GhcTc

The last of these, GhcTcId, is a vestige of the past.

This patch expunges it from GHC.