[v3 PATCH] PR libstdc++/77727

[Jonathan Wakely]

On 26/09/16 02:06 +0300, Ville Voutilainen wrote:
>    PR libstdc++/77727
>    * include/std/optional (optional(const optional<_Up>&)):
>    Default-initialize the base and use emplace.
>    (optional(optional<_Up>&&)): Likewise.
>    * testsuite/20_util/optional/cons/77727.cc: New.

OK, thanks.