Tom Lord <xxxxxx@emf.net> writes:

>        > Note, by the way that while my assq is arguably uglier than yours,
>        > mine is O(1) space and yours is O(N) where N is the length of the
>        > alist.
>
>
> D'oh!  Not really -- I just figured out what `mn_to_cdr' must mean.
> Sorry.
>
> Still, it's noteworthy that to achieve O(1)ness you had to write in
> linear style not procedural style -- the variable `pair_key' in
> particular -- and that you had free two references in a loop rather
> than unprotecting a frame just once, outside the loop.

That's exactly right.  This is the explicit-free clutter.