re PR c++/13651 (double error message when using incomplete types in a struct)

	PR c++/13651
	* parser.c (cp_parser_postfix_expression): When encountering
	incomplete type on left-hand side of "->" or ".", treat the entire
	expression as erroneous.

From-SVN: r76180

gcc/cp/ChangeLog

 2004-01-19  Mark Mitchell  <mark@codesourcery.com>
 
+	PR c++/13651
+	* parser.c (cp_parser_postfix_expression): When encountering
+	incomplete type on left-hand side of "->" or ".", treat the entire
+	expression as erroneous.
+
 	PR c++/13592
 	* call.c (build_field_call): Remove.
 	(n_build_method_call): Likewise.

gcc/cp/parser.c

@@ -3849,6 +3849,11 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p)
 		   being dependent.  */
 		if (!scope)
 		  scope = error_mark_node;
+		/* If the SCOPE was erroneous, make the various
+		   semantic analysis functions exit quickly -- and
+		   without issuing additional error messages.  */
+		if (scope == error_mark_node)
+		  postfix_expression = error_mark_node;
 	      }
 
 	    /* Consume the `.' or `->' operator.  */