weird exception on windows

[Szabo Bogdan]

On Monday, 18 December 2017 at 22:49:30 UTC, unleashy wrote:
> On Friday, 15 December 2017 at 21:56:48 UTC, Steven 
> Schveighoffer wrote:
>> On 12/15/17 10:08 AM, Kagamin wrote:
>>> Maybe this https://issues.dlang.org/show_bug.cgi?id=18084
>>
>> Thanks for looking into this. I created a PR to fix.
>>
>> Szabo, can you please try with this patch and see if it fixes 
>> your issue?
>>
>> https://github.com/dlang/phobos/pull/5932
>>
>> -Steve
>
> I created the original issue in Szabo's post. I applied your 
> fix, but nothing changed—the test program still crashes with 
> the same exception :/
>
> What gives?

It looks like this fix does not work:
https://github.com/dlang/phobos/pull/5932

Does anyone know how to debug this crash?