[Issue 12507] SysTime.init.toString should not segfault

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12507

--- Comment #10 from Rob T <alanb at ucora.com> ---
I just encounter this issue and spent an hour or so figuring out what the cause
was. segfaults tend to be very difficult to track down and deal with. 

A quick sub-optimal fix will be better than leaving it to seg fault.

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