https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91218
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I see an ICE with -std=c++17 -fconcepts and -std=c++20 on the trunk but there are errors before the ICE. I don't know if this because concepts has changed since 2019 or not.
