[v3 PATCH] Adjust optional's pretty printer for LWG 2900.

[Jonathan Wakely]

On 29/03/17 14:51 +0300, Ville Voutilainen wrote:
>Tested on Linux-x64.
>
>2017-03-29  Ville Voutilainen  <ville.voutilainen@gmail.com>
>
>    Adjust optional's pretty printer for LWG 2900.
>    * python/libstdcxx/v6/printers.py (StdExpOptionalPrinter::__init__):
>    Look at the nested payload in case of non-experimental optional.

OK.