newlispfanclub.alh.net

Posted: **Mon Oct 26, 2009 11:59 pm**

> (constant 'foo 3)
3
> (delete 'foo)
nil
> (set 'foo 3)

ERR: symbol is protected in function set : foo

Is this a bug or is there a reason for this?

Posted: **Tue Oct 27, 2009 11:41 am**

Consider this:

> (constant 'foo 3)
3
> (delete 'foo)
nil
> foo
3
> (set 'bar '123)
123
> (delete 'bar)
true
> (sym "bar" MAIN nil)
nil
>

A symbol protected with 'constant' cannot be deleted, that's why the 'delete' returned 'nil' and 'foo' was still there, unblemished.

see also here: http://www.newlisp.org/downloads/newlis ... tml#delete
and: http://www.newlisp.org/downloads/newlis ... l.html#sym

Bug? 'delete' doesn't work on constants