Index: cp/typeck2.c
===================================================================
--- cp/typeck2.c	(revision 180227)
+++ cp/typeck2.c	(working copy)
@@ -428,8 +428,14 @@ cxx_incomplete_type_diagnostic (const_tree value,
 
     case OFFSET_TYPE:
     bad_member:
-      emit_diagnostic (diag_kind, input_location, 0,
-		       "invalid use of member (did you forget the %<&%> ?)");
+      if (DECL_FUNCTION_MEMBER_P (TREE_OPERAND (value, 1)))
+	emit_diagnostic (diag_kind, input_location, 0,
+			 "invalid use of member function "
+			 "(did you forget the %<()%> ?)");
+      else
+	emit_diagnostic (diag_kind, input_location, 0,
+			 "invalid use of member "
+			 "(did you forget the %<&%> ?)");
       break;
 
     case TEMPLATE_TYPE_PARM: