https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 66450, which changed state.
Bug 66450 Summary: [5 Regression][C++11][constexpr] Issues when delegating implicit copy constructor in constexpr function https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66450 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED
