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From: Lennart Borgman <lennart.borgman.073@student.lu.se>
Newsgroups: gmane.emacs.help
Subject: Re: List of major modes?
Date: Thu, 10 Nov 2005 02:15:29 +0100
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rgb wrote:

>>Here's the best I could come up with:
>>
>>(apropos-internal "-mode\\'"
>>                   (lambda (mode)
>>                     (and (commandp mode)
>>                          (string-match "\\`Major mode\\>"
>>                                        (documentation mode)))))
>>    
>>
>
>Slick.
>It needed a slight tweek on my machine running CVS Emacs.
>(documentation mode) would sometimes return nil and blow up
>string-match.  tooltip-mode was one that returned nil.  I don't
>understand why though.  It does seem to be documented.... hmm.
>  
>
C-h f tooltip-mode RET gives a default help string. This actually says 
that tooltip-mode is not documented.