Function permute_left_option_groups

Tools/clinic/libclinic/function.py:269–283

Given [(1,), (2,), (3,)], should yield: () (3,) (2, 3) (1, 2, 3)

(
    l: Sequence[Iterable[Parameter]]
)

def permute_left_option_groups(
    l: Sequence[Iterable[Parameter]]
) -> Iterator[ParamTuple]:
    """
    Given [(1,), (2,), (3,)], should yield:
       ()
       (3,)
       (2, 3)
       (1, 2, 3)
    """
    yield tuple()
    accumulator: list[Parameter] = []
    for group in reversed(l):
        accumulator = list(group) + accumulator
        yield tuple(accumulator)


def permute_right_option_groups(