https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 96363, which changed state.
Bug 96363 Summary: bogus error with multiple constrained partial specialization forward declarations https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96363 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED