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From: Yuri D'Elia <wavexx@thregr.org>
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Subject: Re: "reference to free variable" only during initialization
Date: Sun, 19 Feb 2017 15:22:20 +0100
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On Sun, Feb 19 2017, Noam Postavsky wrote:
> At the end of the (defadvice isearch-query-replace-regexp ...) there is
>
>     `(lambda () (setq modelinepos-region-acting-on  ',isearchp-reg-beg))
>
> This uses isearch-reg-beg without checking if it's boundp (the other
> occurences do have a boundp check first).

Ah! Well, this is interesting, I completely missed this usage. And after
understanding it, I'm also somehow surprised that this is not showing up
more often.