bug#33309: Add flatten-list?

[Stefan Monnier]

>> I think we should document clearly what should happen with nil and with
>> dotted pairs.
> Thanks for checking those others. I think it makes sense to completely
> "flatten" the tree. In other words, combine all dotted pairs. I'm less
> sure about what to do with nil entries. It looks like most of the
> existing implementations drop nil elements, so I guess we'll do that?

I don't know: I've never needed to "flatten a tree" (nor know when one
might want to do that) and haven't looked at the existing uses either.


        Stefan