function print_to_string(var)
	game.print(tostring(var))
end

function to_string(var)
	local var = tostring(var)
end

script.on_event(defines.events.on_tick,function(event) 
	if game.tick % 1800 == 0 then
		game.print('Printing tostring')
		print_to_string({})
		print_to_string(game.players[1]) 
	end
	if (game.tick+900) % 1800 == 0 then
		game.print('Not Printing tostring')
		to_string({})
		to_string(game.players[1])
	end
end)