At 02:26 PM 7/24/96 PDT, you wrote:
>foo[expr] = bar
>
>Where if expr is greater than the length of foo, it would append bar to
>the end of the list foo. A good example of `expr' might be `$ + 1' or
>some other symbol similar to $ to represent the slot past the end of the
>list.
;;x={1}; x[$+1..$] = {2}; return x;