Function binary

extra_tests/snippets/syntax_generator.py:95–100

(n)

assert r == ['a', 66, None]

def binary(n):
    if n <= 1:
        return 1
    l = yield from binary(n - 1)
    r = yield from binary(n - 1)
    return l + 1 + r

with assert_raises(StopIteration):
    try: