RE: [External] : Re: Appending lists

[Drew Adams]

> Maybe that still isn't a guarantee nreverse can't screw up
> something else just the same, unsure how to "partition" or
> isolate it if you will?

Read your mail quickly.  HTH.  In general, you can use
a "destructive" function such as `nreverse' on something
that you've created, e.g. as a separate object from
other existing objects.  E.g., if you _copy_ a list then
you can use `nreverse' on your copy without bothering
the list you copied.

Depending on the kind of "destructive" operation, you
might need to make a deep copy.  In all cases, if you
use a destructive operation, you should know what it
does - that's a prerequisite, unless you really enjoy
surprises.