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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 23:18:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99599

--- Comment #26 from Jonathan Wakely <redi at gcc dot gnu.org> ---
What's bizarre about the PR 104606 case is that this fixes it:

--- a/libstdc++-v3/include/std/optional
+++ b/libstdc++-v3/include/std/optional
@@ -1431,7 +1431,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #ifdef __cpp_lib_three_way_comparison
   template<typename _Tp, typename _Up>
     requires (!__is_optional_v<_Up>)
-      && three_way_comparable_with<_Tp, _Up>
+      && three_way_comparable_with<_Up, _Tp>
     constexpr compare_three_way_result_t<_Tp, _Up>
     operator<=3D>(const optional<_Tp>& __x, const _Up& __v)
     { return bool(__x) ? *__x <=3D> __v : strong_ordering::less; }=