https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58601 Bug 58601 depends on bug 59012, which changed state.
Bug 59012 Summary: alignas does not support parameter pack expansions https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59012 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED