cp-tree.h (lang_type): Add documentation.

cp-tree.h (lang_type): Add documentation.

	* cp-tree.h (lang_type): Add documentation.
	* decl2.c (handle_class_head): Create template declarations here,
	as appropriate.
	* parse.y (class_head): Return whether or not we entered a new
	scope, as well as the type named.
	(named_class_head): Likewise.
	(named_complex_class_head_sans_basetype): Likewise.
	(structsp): Adjust accordingly.  Pop scope when required.
	* parse.c: Regenerated.
	* pt.c (check_default_tmpl_args): Robustify.
	(redeclare_class_template): Likewise.
	(instantiate_class_template): An instantiation of an
	anonymous union is itself an anonymous union.
	* semantics.c (begin_class_definition): Don't create template
	declarations here.

From-SVN: r26475