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From: Lennart Borgman <lennart.borgman.073@student.lu.se>
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Subject: Re: (define-key my-sparse-map [(left)] nil) => (left) entry
	in	keymap
Date: Thu, 03 Nov 2005 02:58:54 +0100
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Stefan Monnier wrote:

>>I believed that you could remove a key binding with (define-key keymap key
>>nil). However with a sparse keymap I instead get an entry that is just
>>(key). Is this a bug?
>>    
>>
>
>No,
>  
>
Thanks, that helped ;-)  -- now I see how it works: nil has the meaning 
"no binding at all, not even default".