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From: Alexander Shukaev <haroogan@gmail.com>
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Subject: Re: To `boundp' or not to `boundp'?
Date: Tue, 1 Sep 2015 17:53:55 +0200
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To: Dmitry Gutov <dgutov@yandex.ru>
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>> I often see code like this
>>
>> (when (and (boundp 'xxx-mode) xxx-mode)
>>    ...)
>
>
> The "proper" way to do that is to use bound-and-true-p.

Interesting, thanks, Dmitry.