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From: Markus Triska <markus.triska@gmx.at>
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Subject: Re: re-defvar a variable without reloading emacs
Date: Sat, 13 Jun 2009 15:54:32 +0200
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ken <gebser@mousecar.com> writes:

> I've got a defvar'd variable in my .emacs which I want to redefine.  But
> rerunning (defvar somevar "someval") doesn't work

Use C-M-x (`eval-defun') on the form instead; from its docstring:

   If the current defun is actually a call to `defvar' or `defcustom',
   evaluating it this way resets the variable using its initial value
   expression even if the variable already has some other value.