Always qualify in defaultErrStyle
-- Only used for desugarer warnings, and typechecker errors in interface sigs
defaultErrStyle
| opt_PprStyle_Debug = mkUserStyle alwaysQualify AllTheWay
- | otherwise = mkUserStyle neverQualify (PartWay opt_PprUserLength)
+ | otherwise = mkUserStyle alwaysQualify (PartWay opt_PprUserLength)
mkUserStyle unqual depth | opt_PprStyle_Debug = PprDebug
| otherwise = PprUser unqual depth