https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 91073, which changed state.
Bug 91073 Summary: [9 Regression] if constexpr no longer works directly with Concepts https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91073 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED
