Re: Any interest in a function like this to add to subr.el?

[Stefan Monnier]

>>> We'd want a destructive version of it as well, though.
>> Why?
> I was thinking for performance.

I'd find it really surprising if N uses of `cons` would be
sufficiently more expensive than N uses of `setcar` not to be
drowned by the O(N*log N) funcalls and other processing.
But it wouldn't be the first time I was wrong, of course.


        Stefan