I think `#if` and `#ifdef` are not good ideas because they prevent the compiler from seeing them in the first place. A better solution is just `if (false)` whic

I think `#if` and `#ifdef` are not good ideas because they prevent the compiler from seeing them in the first place. A better solution is just `if (false)` which is nestable, and the code is still checked by the compiler so it won't bit rot.