https://issues.dlang.org/show_bug.cgi?id=14674
--- Comment #2 from sigsve <sigurdbergsv...@gmail.com> --- My apologies for being vague, I was hoping you'd have a Mac available. It is definitely a linking error(This is the error I get): Undefined symbols for architecture x86_64: "_D5Stack12__ModuleInfoZ", referenced from: _D4Main12__ModuleInfoZ in Main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) But, as said, this error only shows if I include std.stdio in the Stack.d file --