def cast(cast_fn):
    """
    >>> from Redy.Magic.Classic import cast
    >>> @cast(list)
    >>> def f(x):
    >>>     for each in x:
    >>>         if each % 2:
    >>>             continue
    >>>         yield each
    """

    def inner(func):
        def call(*args, **kwargs):
            return cast_fn(func(*args, **kwargs))

        functools.update_wrapper(call, func)
        return call

    return inner