D is not simple and by default it relies on a garbage collector. And yes, I meant it's easy to write a simple/"toy"-compiler. TCC is a good example, and I've a

D is not simple and by default it relies on a garbage collector. And yes, I meant it's easy to write a simple/"toy"-compiler. TCC is a good example, and I've actually used it for a real in-house project. Not every application requires perfect compatability and good optimization, and it makes it easy to get started on more elaborate compilers.