https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004 Bug 55004 depends on bug 54126, which changed state.
Bug 54126 Summary: ICE on constexpr move ctor with const ref type instead of error https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54126 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED