# Write the subtree on stdout.
	#
	# Visit the subtree and display it with additional and useful information.
	#
	# By default, this displays all kind of nodes and the corresponding lines of codes.
	#
	# See `ASTDump` for details.
	fun dump_tree(display_structural, display_line: nullable Bool)
	do
		var d = new ASTDump(display_structural or else true, display_line or else true)
		d.enter_visit(self)
		d.write_to(sys.stdout)
	end