[Bug c++/94141] c++20 rewritten operator== recursive call mixing friend and external operators for template class

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94141

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
It looks like clang-10+ also generates an infinite loop on this code. Does the
standard really give priority to some implicit function over a user-defined one
that is an exact match?