CPython:
>>> from itertools import *
>>> a = chain.from_iterable(repeat(range(2)))
>>> next(a)
0
>>> next(a)
1
>>> next(a)
0
RustPython does not evaluate lazily and the call to from_iterable never returns:
>>>>> from itertools import *
>>>>> a = chain.from_iterable(repeat(range(2)))
CPython:
RustPython does not evaluate lazily and the call to
from_iterablenever returns: