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

[Ivan Kazmenko via Digitalmars-d-learn]

On Wednesday, 30 August 2017 at 13:33:06 UTC, Ivan Kazmenko wrote:
> Interesting.  As to what to do with it, no idea for now.  At 
> the very least we can issue a bug report, now that at least two 
> people can reproduce it, so it is unlikely to be 
> environment-dependent.

Reported: https://issues.dlang.org/show_bug.cgi?id=17797 .