https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 56041, which changed state.
Bug 56041 Summary: Constexpr conversion function definition not found in template argument context https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56041 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED
