# mode: run

# tag: generator

def yield_from_gen(values):

    """

    >>> def yf(x): yield from x

    >>> list(yf(yield_from_gen([1, 2, 3, 4])))

    [1, 2, 3, 4]

    """

    for value in values:

        yield value

def yield_from_gen_return(values):

    """

    >>> def yf(x): yield from x

    >>> list(yf(yield_from_gen_return([1, 2, 3, 4])))

    [1, 2, 3, 4]

    """

    for value in values:

        yield value

    return 5