https://gcc.gnu.org/ml/gcc-patches/2018-07/msg00701.html
	PR c++/86374
	* pt.c (lookup_template_class_1): Use tsubst_aggr_type for
	contexts that are classes.
	* parser.c (cp_parser_template_id): Combine entering_scope decl &
	initializer.

	PR c++/86374
	* g++.dg/pr86374.C: New.

From-SVN: r262637