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What does this mean? Error: Attempt to set the value of nil to nil.
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Hyunchul Jay Kim  
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 More options Nov 23 1999, 3:00 am
Newsgroups: comp.lang.lisp
From: Hyunchul Jay Kim <hyunc...@andrew.cmu.edu>
Date: 1999/11/23
Subject: What does this mean? Error: Attempt to set the value of nil to nil.
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Can anyone please tell what is error message is about?

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

Thanks.
- Jay                          


 
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Espen Vestre  
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 More options Nov 23 1999, 3:00 am
Newsgroups: comp.lang.lisp
From: Espen Vestre <espen@*do-not-spam-me*.vestre.net>
Date: 1999/11/23
Subject: Re: What does this mean? Error: Attempt to set the value of nil to nil.
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Hyunchul  Jay Kim <hyunc...@andrew.cmu.edu> writes:

> Can anyone please tell what is error message is about?

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

> Thanks.
> - Jay                              

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

--
  (espen)


 
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Martin  
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 More options Nov 23 1999, 3:00 am
Newsgroups: comp.lang.lisp
From: m...@nospam.capita.nildram.co.uk (Martin )
Date: 1999/11/23
Subject: Re: What does this mean? Error: Attempt to set the value of nil to nil.
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In article <w6ogclphys....@wallace.nextel.no>, Espen Vestre <espen@*do-not-spam-me*.vestre.net> wrote:
>Hyunchul  Jay Kim <hyunc...@andrew.cmu.edu> writes:

>> Can anyone please tell what is error message is about?

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

>> Thanks.
>> - Jay                                

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

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

Martin


 
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Fernando D. Mato Mira  
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 More options Nov 23 1999, 3:00 am
Newsgroups: comp.lang.lisp
From: "Fernando D. Mato Mira" <matom...@iname.com>
Date: 1999/11/23
Subject: Re: What does this mean? Error: Attempt to set the value of nil to nil.
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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
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Stig Hemmer  
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 More options Nov 28 1999, 3:00 am
Newsgroups: comp.lang.lisp
From: Stig Hemmer <s...@pvv.ntnu.no>
Date: 1999/11/28
Subject: Re: What does this mean? Error: Attempt to set the value of nil to nil.
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Hyunchul  Jay Kim <hyunc...@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.


 
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Erik Naggum  
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 More options Nov 28 1999, 3:00 am
Newsgroups: comp.lang.lisp
From: Erik Naggum <e...@naggum.no>
Date: 1999/11/28
Subject: Re: What does this mean? Error: Attempt to set the value of nil to nil.
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* Stig Hemmer <s...@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


 
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