[Bug libstdc++/71098] uniform initialization for nested tuples work in c++11/14 mode but should only work >=c++17

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71098

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2018-05-14
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Klaus Rudolph from comment #0)
> uniform initialization for nested std::tuple works in c++11/14 mode but
> should work not before c++17.

Why not?