[v3 PATCH] PR libstdc++/68430

[Jonathan Wakely]

On 16 December 2017 at 12:30, Ville Voutilainen  wrote:
> The compiler-powered is_constructible that we have in gcc 8 is powerful
> enough to give the right answer to an is_constructible question
> that would be hard for a pure-library implementation to get right
> in a well-formed fashion. This is just adding a test for it. Tested
> on Linux-PPC64, OK for trunk?

OK, thanks.