What does this mean? Error: Attempt to set the value of nil to nil.

[Hyunchul Jay Kim]

Can anyone please tell what is error message is about?

Error: Attempt to set the value of nil to nil.

Thanks.
- Jay

[Espen Vestre]

maybe that you try to change the value of the constant NIL?

--
(espen)

[Martin]

I would think that using SET intead of SETQ would produce this result if the
destination variable is nil...

Martin

[Fernando D. Mato Mira]

Martin wrote:

> I would think that using SET intead of SETQ would produce this result if the
> destination variable is nil...

Indeed. The first question that came to my mind was "What Lisp are you using?"..

--
((( DANGER )) LISP BIGOT (( DANGER )) LISP BIGOT (( DANGER )))

Fernando D. Mato Mira
Real-Time SW Eng & Networking
Advanced Systems Engineering Division
CSEM
Jaquet-Droz 1 email: matomira AT acm DOT org
CH-2007 Neuchatel tel: +41 (32) 720-5157
Switzerland FAX: +41 (32) 720-5720

www.csem.ch www.vrai.com ligwww.epfl.ch/matomira.html

[Stig Hemmer]

Hyunchul Jay Kim <hyun...@andrew.cmu.edu> writes:
> Can anyone please tell what is error message is about?
> Error: Attempt to set the value of nil to nil.

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.

What code are you trying to run when you get this message?

Stig Hemmer,
Jack of a Few Trades.

[Erik Naggum]

* Stig Hemmer <st...@pvv.ntnu.no>

| 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.)

#:Erik