Re: List of major modes?

[David Reitter]

>        (not (assq symbol minor-mode-alist))))

Good idea, but unfortunately minor-mode-alist contains stuff to be  
shown in the mode-line, so we're not excluding minor modes that don't  
display anything in the mode line (mouse-wheel-mode for example).

Searching the documentation string (Kevin's idea) won't be reliable,  
obviously.

Looking for (kill-all-local-variables) in the definition would be  
another possibility, but who guarantees that this will occur in the  
mode function definition directly, and not in some function called  
from there.

The only solution I can see is to patch define-minor-mode - as a last  
resort.

- D