now `extract_head` should return the leftmost head directly, using its `abort_handler`:
let extract_head = \lst larger_computation. lst
now `extract_head` should return the leftmost head directly, using its `abort_handler`:
let extract_head = \lst larger_computation. lst
3. To extract tails efficiently, too, it'd be nice to fuse the apparatus developed
in these v5 lists with the ideas from the v4 lists, above.
But that also is left as an exercise.
3. To extract tails efficiently, too, it'd be nice to fuse the apparatus developed
in these v5 lists with the ideas from the v4 lists, above.
But that also is left as an exercise.