https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 67934, which changed state.
Bug 67934 Summary: [concepts] ICE when providing default function implementations using concepts https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67934 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |DUPLICATE