Re: Undefined in LISP

Lawrence D'Oliveiro <ldo@nz.invalid> writes:

On Sat, 22 Mar 2025 12:07:14 +0000, Daniel Cerqueira wrote:
>

Lawrence D'Oliveiro <ldo@nz.invalid> writes:
 

On Fri, 21 Mar 2025 22:47:38 +0000, Daniel Cerqueira wrote:
>

I would like to know your thoughts, about what being undefined
actually is. Should an undefined expression be represented by a
symbol, or should an undefined expression be silent (without
returning a symbol)?

>
Should an attempt to evaluate such an expression even terminate?

 
My opinion is that it should...

>
So undefined behaviour cannot be really undefined, it must return some
kind of value we are going to arbitrarily name as “undefined”?

Does every LISP S-expression need to have a value (need to be
evaluated)?  Is atributing a symbol to undefined behaviour needed?

--
The pioneers of a warless world are the youth that
refuse military service. ~ Albert Einstein