re PR c++/16224 (internal compiler error: in write_unscoped_name (template/namespace))

re PR c++/16224 (internal compiler error: in write_unscoped_name (template/namespace))

	PR c++/16224
	* name-lookup.c (decl_namespace): Remove.
	(current_decl_namespace): Use decl_namespace_context instead of
	decl_namespace.
	(push_decl_namespace): Likewise.
	(arg_assoc_class): Likewise.
	(arg_assoc_type): Likewise.
	* pt.c (check_specialization_namespace): New function.
	(maybe_process_partial_specialization): Use it.
	(register_specialization): Likewise.

	PR c++/16224
	* g++.dg/template/spec17.C: New test.
	* g++.old-deja/g++.ns/template13.C: Remove XFAIL.
	* g++.old-deja/g++.pt/lookup10.C: Add dg-error marker.

From-SVN: r85431