https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 67148, which changed state.
Bug 67148 Summary: [concepts] Failed concept check when indirecting through a constrained trait https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67148 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED