PR c++/5333
	* cp-tree.h (CLASSTYPE_PRIMARY_TEMPLATE): New macro.
	* parser.c (cp_parser_diagnose_invalid_type_name): Use it.
	* pt.c (instantiate_class_template): Don't try to instantiate
	dependent types.
	(resolve_typename_type): Use CLASSTYPE_PRIMARY_TEMPLATE.

	PR c++/5333
	* g++.dg/parse/fused-params1.C: Adjust error messages.
	* g++.dg/template/nested3.C: New test.

From-SVN: r63354