re PR c++/84423 ([concepts] ICE with invalid using declaration)

re PR c++/84423 ([concepts] ICE with invalid using declaration)

/cp
2018-10-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84423
	* pt.c (convert_template_argument): Immediately return error_mark_node
	if the second argument is erroneous.
	* parser.c (cp_parser_type_id): Add location_t * parameter.
	(cp_parser_type_id_1): Likewise.
	(cp_parser_alias_declaration): Adjust cp_parser_type_id call,
	obtain the location of the type and save it.
	(cp_parser_template_type_arg): Adjust.
	(cp_parser_trailing_type_id): Likewise.
	* decl.c (grokdeclarator): Improve error message for 'auto' in
	alias declaration.

/testsuite
2018-10-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84423
	* g++.dg/concepts/pr84423-1.C: New.
	* g++.dg/concepts/pr84423-2.C: Likewise.
	* g++.dg/cpp0x/auto39.C: Test location too.
	* g++.dg/cpp0x/auto9.C: Likewise.
	* g++.dg/cpp1y/pr60384.C: Likewise.

From-SVN: r264996