https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58616 Bug 58616 depends on bug 101227, which changed state.
Bug 101227 Summary: Clang++ fails to instantiate std::optional if nested type has a non-static data member initializer https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101227 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |DUPLICATE
