PR c++/18738
	* decl.c (make_typename_type): Do not handle namespace-scoped
	names here.
	(tag_name): Handle typename_type.
	(check_elaborated_type_specifier): Handle typenames.
	* parser.c (cp_parser_diagnose_invalid_type_name): Improve
	comment.
	(cp_parser_elaborated_type_specifier): Use
	cp_parser_diagnose_invalid_type_name.

	PR c++/18738
	* g++.dg/template/typename8.C: New test.
	* g++.dg/parse/friend2.C: Tweak error message.

From-SVN: r92172