At the moment it only shows up as an on-screen warning in my Qt Creator thanks to its clang integration. The default Serenity toolchain is using GCC-8.3.0 which

At the moment it only shows up as an on-screen warning in my Qt Creator thanks to its clang integration. The default Serenity toolchain is using GCC-8.3.0 which doesn't support this trick at all, so we don't get any compile-time enforcement. :( I keep thinking about switching over to a clang toolchain to be able to do more stuff like this.