1\DOC triple_of_list 2 3\TYPE {triple_of_list : 'a list -> 'a * 'a * 'a} 4 5\SYNOPSIS 6Turns a three-element list into a triple. 7 8\DESCRIBE 9{triple_of_list [x, y, z]} returns {(x, y, z)}. 10 11\FAILURE 12Fails if applied to a list that is not of length 3. 13 14\SEEALSO 15Lib.singleton_of_list, Lib.pair_of_list, Lib.quadruple_of_list. 16 17\ENDDOC 18