lookupGlobalOccRn :: RdrName -> RnM Name
-- lookupGlobalOccRn is like lookupOccRn, except that it looks in the global
--- environment. It's used only for
+-- environment. It's called directly only for
-- record field names
-- class op names in class and instance decls
+-- names in export lists
lookupGlobalOccRn rdr_name
| not (isSrcRdrName rdr_name)