https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80064
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to work| |4.8.5, 5.4.1, 6.3.1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- clang++ errors the same way btw, so maybe G++6 (bogously) did not instantiate this type.