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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99599] [11/12/13 Regression] Concepts requirement falsely
 reporting cyclic dependency, breaks tag_invoke pattern
Date: Wed, 27 Mar 2024 23:16:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99599

--- Comment #25 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It looks like PR 104606 is another case.

#include <optional>
#include <variant>
#include <vector>

struct Value : public std::variant<std::vector<Value>> { };

struct Comparator {
    template <typename T>
    bool operator<=3D(const T &rhs)
    {
        return true;
    }
};

int main()
{
    auto test2 =3D Comparator() <=3D std::optional<Value>{};
}

Preprocessing this with 10.4 and compiling with 11.1 fails, bisection shows=
 it
started to fail with r11-2774.=