I have solved this task, but can't recieve result after several tries - checkin lasts forever and no result is given.
ADVICE: Make much smaller cheking range of num - this will still check the result, but willn't freeze solver with tail recursion problem.
From: http://www.checkio.org/mission/fibonacci-golf/solve/
HTTP_USER_AGENT:
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0
Created at: 2015/10/05 08:43; Updated at: 2015/10/05 12:50