`std::stod ("nan")` returns negative NaN

[Duncan Roe]

On Mon, Aug 13, 2018 at 12:52:48PM -0400, Stephen John Smoogen wrote:
> On Mon, 13 Aug 2018 at 11:16, Masamichi Hosoda <trueroad@trueroad.jp> wrote:
[...]
> On Fedora 27 with 7.3.1 it gives
> ```
> stod ("nan") = nan
> stod ("-nan") = nan
> quiet_NaN () = nan
> ```
[...]

Same with Slackware 14.2 / gcc (GCC) 5.3.0

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