+-- Looking up family names in type instances is a subtle affair. The family
+-- may be imported, in which case we need to lookup the occurence of a global
+-- name. Alternatively, the family may be in the same binding group (and in
+-- fact in a declaration processed later), and we need to create a new top
+-- source binder.
+--
+-- So, also this is strictly speaking an occurence, we cannot raise an error
+-- message yet for instances without a family declaration. This will happen
+-- during renaming the type instance declaration in RnSource.rnTyClDecl.
+--
+lookupFamInstDeclBndr :: Module -> Located RdrName -> RnM Name
+lookupFamInstDeclBndr mod lrdr_name@(L _ rdr_name)
+ = do { mb_gre <- lookupGreRn_maybe rdr_name
+ ; case mb_gre of
+ Just gre -> returnM (gre_name gre) ;
+ Nothing -> newTopSrcBinder mod lrdr_name }
+