https://issues.dlang.org/show_bug.cgi?id=18024
--- Comment #5 from Seb <greensunn...@gmail.com> --- > Don't forget it also prints to stderr, which is why it's @system impure gc > and throws Yeah I did forget about this when I opened the issue (didn't had time to dive into this then). Anyhow it `Warn` can easily be made @safe: PR https://github.com/dlang/phobos/pull/5928 --