[Bug c++/62222] 'tuple_element_t' was not declared in this scope

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62222

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to tower120 from comment #3)
> Oh I see.
> 
> Well, what gcc version is that, then?
> http://patchwork.ozlabs.org/patch/339121/

5.x.