Not sure why this build is failing for version 3.8. Does anyone have any suggestions on how to get this fixed? Thx!

@james-wasson Looks like the build is failing on the black step; you'll need to reformat your files with black. You can run all the checks locally with make all-checks.

I'd rather have a non-recursive algorithm, so once this passes checks I'll merge it! Thanks for the PR.

All checks passed locally.

For reference

from more_itertools import collapse, consume
iterable = ['ab', ('cd', [(1, 2), ([3, [(1, 2), ([3, 4], [[5], [6]])]], [[5], [6]])]), ['gh', 'ij'], [(1, [(1, 2), ([3, 4], [[5], [6]])])]]
%timeit -n 100000 consume(collapse(iterable))