turn super-related errors into display_error so completion can work

typer.ml

@@ -1132,16 +1132,16 @@ and type_field ?(resume=false) ctx e i p mode =
 				| MCall,Var {v_read = AccCall } ->
 					()
 				| MCall, Var _ ->
-					error "Cannot access superclass variable for calling: needs to be a proper method" p
+					display_error ctx "Cannot access superclass variable for calling: needs to be a proper method" p
 				| MCall, _ ->
 					()
 				| MGet,Var _
 				| MSet,Var _ when (match c2 with Some { cl_extern = true; cl_path = ("flash" :: _,_) } -> true | _ -> false) ->
 					()
 				| _, Method _ ->
-					error "Cannot create closure on super method" p
+					display_error ctx "Cannot create closure on super method" p
 				| _ ->
-					error "Normal variables cannot be accessed with 'super', use 'this' instead" p);
+					display_error ctx "Normal variables cannot be accessed with 'super', use 'this' instead" p);
 			if not (can_access ctx c f false) && not ctx.untyped then display_error ctx ("Cannot access private field " ^ i) p;
 			field_access ctx mode f (match c2 with None -> FAnon f | Some c -> FInstance (c,f)) (apply_params c.cl_types params t) e p
 		with Not_found -> try