parser.c (cp_parser_alias_declaration): Don't do semantic processing if parsing failed.

	* parser.c (cp_parser_alias_declaration): Don't do semantic
	processing if parsing failed.

From-SVN: r181218

gcc/cp/ChangeLog

+2011-11-09  Jason Merrill  <jason@redhat.com>
+
+	* parser.c (cp_parser_alias_declaration): Don't do semantic
+	processing if parsing failed.
+
 2011-11-09  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/51045

gcc/cp/parser.c

@@ -14946,6 +14946,9 @@ cp_parser_alias_declaration (cp_parser* parser)
   type = cp_parser_type_id (parser);
   cp_parser_require (parser, CPP_SEMICOLON, RT_SEMICOLON);
 
+  if (cp_parser_error_occurred (parser))
+    return error_mark_node;
+
   /* A typedef-name can also be introduced by an alias-declaration. The
      identifier following the using keyword becomes a typedef-name. It has
      the same semantics as if it were introduced by the typedef