On 15 December 2017 at 15:54, John Wiegley <johnw@gnu.org> wrote:

> >>>>> "j" == jun  <netjune@163.com> writes:
>
> j> like this: (copy-sequence seq &optional from to). 'from' and 'to' mean
> the
> j> same as in the function 'substring'.
>
> I'd rather not overload copy-sequence that way, and rather have a new
> function
> named (sublist LIST &optional FROM TO), even if copy-sequence xs ==
> sublist xs.
>

There is already the function ‘subseq’ that does exactly this, or did I
misunderstand
the question?