[Bug c++/104160] Wrongly allowed: Function argumentin constant expression

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104160

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
struct Array  {
    static constexpr bool isArray() noexcept { return true; }
};

template <typename JSONVariant>
constexpr void buggyImpl(const JSONVariant& JSONValue) noexcept {
    constexpr bool t = JSONValue.isArray();
}

int main() {
    buggyImpl(Array{});
    return 0;
}

There might be a dup of this too.