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From: Steven Allen <steven@stebalien.com>
To: Suhail Singh <suhailsingh247@gmail.com>
Cc: Suhail Singh <suhailsingh247@gmail.com>, Ihor Radchenko
 <yantar92@posteo.net>, emacs-orgmode@gnu.org, Bastien <bzg@gnu.org>
Subject: Re: [POLL] We plan to remove #+LINK: ...%(my-function) placeholder
 from link abbreviation spec
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Suhail Singh <suhailsingh247@gmail.com> writes:

> Steven Allen <steven@stebalien.com> writes:
>
>> The concern is that, e.g., there may b a function _marked_ as pure
>> that's not actually pure, leaks some information, and/or has a
>> security vulnerability (e.g., a C function exposed to lisp that's
>> marked as pure but internally has, e.g., a buffer overflow).
>
> Are there any functions marked as pure, by default?
>

Yes. Any function that starts with:

    (declare (pure t) ...

This flag was introduced to allow the byte/native compiler to better
optimize calls to pure functions. It's used here because "pure"
functions should be safe to call.