https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 71965, which changed state.
Bug 71965 Summary: [8/9/10 Regression] [concepts] Substitution error *after* failure to satisfy an earlier constraint https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71965 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED