[Bug libstdc++/99846] [11 regression] std::variant comparison operator error for recursive type

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99846

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oops, sorry, I meant to paste this as the further reduced version:

#include <list>

struct Value;

using Array = std::list<Value>;

struct Value : Array {};

int main()
{
        Value left;
        Value right;

        return left < right;
}