Why does this script BSOD-ize windows ?

[Kagamin via Digitalmars-d-learn]

http://forum.dlang.org/post/oyzgbvdzyjmupkduzhcd@forum.dlang.org 
- maybe related

On Tuesday, 21 July 2015 at 11:03:47 UTC, Baz wrote:
> Mmmmh i see, you think that t will be on TLS like this ?

I thought it passes some weird value, that sleep doesn't like.

> But i'll test later, actually the crash happens after a few 
> iterations, eg i run the script, i check it works, i go away

Is the system trying to go to sleep mode? At least XP didn't like 
unexpected hardware events when going to sleep.