re PR c++/57471 (Bizarre error for template parameter pack)

	PR c++/57471
	* parser.c (cp_parser_sizeof_pack): Clear parser scopes.

From-SVN: r200852

gcc/cp/ChangeLog

 2013-07-09  Jason Merrill  <jason@redhat.com>
 
+	PR c++/57471
+	* parser.c (cp_parser_sizeof_pack): Clear parser scopes.
+
 	PR c++/57658
 	* semantics.c (finish_id_expression): Return the id for an
 	unevaluated outer variable.

gcc/cp/parser.c

@@ -23136,6 +23136,10 @@ cp_parser_sizeof_pack (cp_parser *parser)
 
   cp_token *token = cp_lexer_peek_token (parser->lexer);
   tree name = cp_parser_identifier (parser);
+  /* The name is not qualified.  */
+  parser->scope = NULL_TREE;
+  parser->qualifying_scope = NULL_TREE;
+  parser->object_scope = NULL_TREE;
   tree expr = cp_parser_lookup_name_simple (parser, name, token->location);
   if (expr == error_mark_node)
     cp_parser_name_lookup_error (parser, name, expr, NLE_NULL,

gcc/testsuite/g++.dg/cpp0x/variadic-sizeof2.C

+// PR c++/57471
+// { dg-require-effective-target c++11 }
+
+struct A
+{
+  static constexpr bool value = true;
+};
+
+template<typename... Types>
+struct B
+{
+  static_assert(A::value, "");
+  static_assert(sizeof...(Types) == 0, "");
+};