Iterators
#1: Fibonacci numbers
make exec_iterator1
{ step: 1, value: 0 }
{ step: 2, value: 1 }
{ step: 3, value: 1 }
{ step: 4, value: 2 }
{ step: 5, value: 3 }
{ step: 6, value: 5 }
{ step: 7, value: 8 }
{ step: 8, value: 13 }
{ step: 9, value: 21 }
{ step: 10, value: 34 }
{ step: 11, value: 55 }
{ step: 12, value: 89 }
{ step: 13, value: 144 }
{ step: 14, value: 233 }
{ step: 15, value: 377 }
{ step: 16, value: 610 }
{ step: 17, value: 987 }
{ step: 18, value: 1597 }
{ step: 19, value: 2584 }
{ step: 20, value: 4181 }