https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 67217, which changed state.
Bug 67217 Summary: [concepts] Constraints are ignored when specializing union templates https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67217 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED
