https://issues.dlang.org/show_bug.cgi?id=12625
--- Comment #11 from ZombineDev <petar.p.ki...@gmail.com> --- I don't think that it should be allowed even in @system code. I had a very ugly stack corruption because of this bug in a networking project. Thankfully, I had thorough unittests to catch it early, but still it wasn't obvious to track down at all. --