iterative operator extension

[TEITELMAN]

it is now possible to redefine built in iterative oprators
using i.s.opr. to refer to the original definition, one uses
the flag ORIGINAL (similar to prettyprint, compiler, editor conventions)>
E.G.
i.s.opr(while NIL (WHEN FOO ORIGINAL WHILE BODY))
could be used to extend the definition of
WHILE to include a FOO check.

note thatin the case thatthe i.s.opr is already defined via a
property list definiton, e.g. collect, do, count, etc.
then if you redefiie it, ORIGINAL will not be abe
to obtai the original definition. ORIGINAL is primarily
intended for redefining and/or extending built in opratrs,
such as WHILE, TO, IN, and (i hope it works) FOR, BIND, etc.

warren


-------