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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Confusion about elisp symbols and defuns
Date: Wed, 24 Sep 2014 08:51:28 -0400
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> (defun foo (v)
>   (makunbound v)
>   (boundp v))
> foo

> (foo 'g)
> nil

> (foo 'v)
> => error signal

> How would you change the calc-var-value to avoid this trap?

Use lexical-binding.


        Stefan