>>> from distrep import disti

>>> it=disti(iter([1]))
>>> next(it) 
Traceback (most recent call last):
  File ...
StopIteration

>>> it=disti(iter([1, 1]))
>>> next(it)
0
>>> next(it) 
Traceback (most recent call last):
  File ...
StopIteration

>>> it=disti(iter([1, 2, 3, 4]))
>>> next(it) 
Traceback (most recent call last):
  File ...
StopIteration

>>> it=disti(iter([1, 2, 3, 1]))
>>> next(it)
2
>>> next(it)
Traceback (most recent call last):
  File ...
StopIteration


--ini-enunciat
>>> it=iter([1,2, 3, 4, 3, 2, 1, 1, 0, 1, 2, 5, 6, 5, 4, 2, 1])
>>> g = disti(it)
>>> next(g)
5
>>> next(g)
0
>>> next(g)
1
>>> next(g)
6

--fi-enunciat

>>> next(g)       # doctest: +ELLIPSIS
Traceback (most recent call last):
  File ...
StopIteration