Edit detail for #432 List doesn't check for circularity in length revision 1 of 6

changed:
-
\begin{axiom}
u:= [9,2,4,7]; concat! (u, [1,2,42]); end := rest(u,4); part:=rest(u,2);  setrest!(end, part);
\end{axiom}

Asking for the number of elements of u will exhibit lisp-implementation-dependend behaviour, ranging from an error to an infinite loop.

We should either fix the documentation (saying, that this is the case), or check for circularity.  This could be done by calling 'INTEGER-LENGTH' in 'ILIST', for example.

u:= [9,2,4,7]; concat! (u, [1,2,42]); end := rest(u,4); part:=rest(u,2);
setrest!(end, part);