https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80284
frankhb1989 at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from frankhb1989 at gmail dot com --- Glad to see the clarification and the decision (though the author of N4510 told me that libstdc++ did have some considerations on the feature). And I realized it would also not even work for `vector`. I'm OK to also rule such cases out of support in the standard library; however, I did not find the rule in the standard. Now the question should better go to std-discussion, not remains here. So closed.