Fix safety issue -- freebsd core dump?

[MoonlightSentinel]

On Wednesday, 5 August 2020 at 04:50:33 UTC, Steven Schveighoffer 
wrote:
> However, FreeBSD 64-bit is core dumping when testing the 
> compiler [3]. It seems consistent, but also seems like it 
> doesn't make sense for that change to cause that, and only on 
> one platform.

This seems to be a regression which got introduced a few days ago.