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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: elisp programming questions
Date: Mon, 29 Oct 2012 10:21:29 -0400
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>> (defvar say-hi-mode-map
>>   (let ((map (make-keymap)))
>>     (define-key map [left] 'say-hi)
>>     ;;(define-key map [right] 'say-hi)
>>     map))

> DEFVAR only assigns the variable if it doesn't already have a value. So 
> when you run it the second time, it doesn't do anything because the 
> variable is already initialized.

That's right.

> Change it to:
> (defvar say-hi-mode-map (make-keymap))
> (define-key map [left] 'say-hi)
> (define-key map [right] 'say-hi)

No, this is bad style.  Instead, just use C-M-x with point within
the defvar (or use defconst).


        Stefan