[Bug c++/90033] [concepts] ICE segfault evaluating a requires clause that transitively depends on itself

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90033

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It was fixed by the r10-3735 rewrite "Update the concepts implementation to
conform to C++20." That definitely isn't going to be backported.