https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54366 Bug 54366 depends on bug 78209, which changed state.
Bug 78209 Summary: Decltype of rvalue reference https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78209 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED