* decl2.c (arg_assoc_class): Also look at template arguments, if any.
	(arg_assoc): Handle error_mark_node and multiple levels of TREE_LIST.
	* lex.c (looking_for_typename): Don't initialize.
	* decl2.c (ambiguous_decl): Clarify error message.
	* decl.c (push_using_directive): Iterate over namespaces used
	indirectly.

From-SVN: r21205