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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101681] PMF comparison to nullptr is not considered a
 constexpr inside a template argument
Date: Tue, 11 Jan 2022 18:40:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101681

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|PMF comparison to nullptr   |PMF comparison to nullptr
                   |is not considered a         |is not considered a
                   |constexpr                   |constexpr inside a template
                   |                            |argument

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note completeness of the class does not matter either:
template <bool> struct Z { };
struct C
{
    void f();
};
static_assert ((&C::f =3D=3D 0) =3D=3D false,"");
Z<&C::f =3D=3D 0> z;

--- CUT ---
The static_assert passes just fine but the template is still rejected.=