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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/96416] address_of() is broken by static_assert in
 pointer_traits
Date: Mon, 03 Aug 2020 12:58:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96416

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this is the "correct" behaviour.

The specification of pointer_traits<Ptr>::element_type says that if
Ptr::element_type isn't valid, and Ptr isn't a template that can be "reboun=
d",
then "otherwise, the specialization is ill-formed."

This explicitly says "the specialization" (meaning pointer_traits<Ptr> itse=
lf).
Compare this with th rebind member which only says "the instantiation of re=
bind
is ill-formed".=