:return:
        a delegator function that returns a coroutine object by calling
        ``corofunc(seed_tuple, *args, **kwargs)``.

def call(corofunc, *args, **kwargs):
    """
    :return:
        a delegator function that returns a coroutine object by calling
        ``corofunc(seed_tuple, *args, **kwargs)``.
    """
    corofunc = _ensure_coroutine_function(corofunc)
    def f(seed_tuple):
        return corofunc(seed_tuple, *args, **kwargs)
    return f