Use TcRnDiagnostic in GHC.Tc.TyCl.Instance (#20117)
Continuing work to update TcRnUnknownMessages
in #20117 (closed).
This MR is for GHC.Tc.TyCl.Instance
(7)
Continuing work to update TcRnUnknownMessages
in #20117 (closed).
This MR is for GHC.Tc.TyCl.Instance
(7)