next -- get the next object from an iterator

• Usage:

  next x

• Inputs:
  • x, a thing, an iterator;
• Outputs:
  • a thing, the next object from x;

i1 : iter = iterator {1, 2, 3}

o1 = iter

o1 : Iterator

i2 : next iter

o2 = 1

i3 : next iter

o3 = 2

i4 : next iter

o4 = 3

i5 : next iter

o5 = StopIteration

o5 : Symbol