Subject: Re: What does this mean?  Error: Attempt to set the value of nil to nil.
From: Erik Naggum <>
Date: 1999/11/28
Newsgroups: comp.lang.lisp
Message-ID: <>

* Stig Hemmer <>
| NIL is a constant.  It should not be changed.  The system isn't smart
| enough to see that you "change" it to the same value, NIL.

  that would be too smart for its own good.  it's the setting of a constant
  that is an error, not the value you attempt to set it to.  (the error
  message is thus a wee bit confusing in allowing that interpretation.)