writeln() sometimes double prints from main() if I run a thread checking for input?

[John Burton via Digitalmars-d-learn]

On Thursday, 31 August 2017 at 21:06:17 UTC, Ivan Kazmenko wrote:
> On Thursday, 31 August 2017 at 14:43:39 UTC, Steven 
> Schveighoffer wrote:
>> Just a thought, but the "double printing" could be a 
>> misunderstanding. It could be printing Output\nOutput2, but 
>> not getting the 2 out there.
>

Just to say that I can reproduce this on my system. Newly 
downloaded copy of v2.076.0
Window 7 "enterprise" 64 bit. Standard cmd.com command shell.

I get Output2 duplicated most of the time. Occasionally I get 
Output duplicated. Occasionally Output2 is out of order...