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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Why is Lisp_Object a struct?
Date: Sun, 03 Feb 2013 21:24:57 +0200
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> Date: Sun, 3 Feb 2013 19:41:34 +0100
> From: Aur=C3=A9lien Aptel <aurelien.aptel+emacs@gmail.com>
>=20
> Why can Lisp_Object be a struct?

To catch code that abuses the fact that Lisp_Object is an integer dat=
a
type.

> What is the purpose of the CHECK_LISP_OBJECT_TYPE define?

See above.