re PR c++/13797 (ICE on invalid template parameter)

re PR c++/13797 (ICE on invalid template parameter)

	PR c++/13797
	* pt.c (instantiate_class_template): Add an error_mark_node
	check.
	(tsubst_decl) <TEMPLATE_DECL case>: Likewise.

	Backport from mainline
	2003-05-09  Kriang Lerdsuwanakij  <lerdsuwa@users.sourceforge.net>

	PR c++/10555, c++/10576
	* pt.c (lookup_template_class): Handle class template with
	multiple levels of parameters when one of the levels contain
	errors.

	* g++.dg/template/nontype4.C: New test.
	* g++.dg/template/nontype5.C: Likewise.
	* g++.dg/template/memclass1.C: New test.

From-SVN: r76562