Clarification Oblig 2

Clarification:

In the SML oblig 2 it says that you are not allowed to use assignments.

That means that you can't use mutable references (destructive updates) and assign new values to these.

Like

val mutVar = ref 1;

mutVar := 2;

You are of course allowed to use variable bindings as in

val x = 1;

or

let val (a,b) in a+b end;