I've fallen into that trap on both forth and lisp. It's fun as it is to implement interpreters for both, and it does give a sense of their simplicity. But, when

I've fallen into that trap on both forth and lisp. It's fun as it is to implement interpreters for both, and it does give a sense of their simplicity. But, when you implement X in Y, you're not really learning X, you're learning how to write an interpreter (or compiler) in Y. Fortunately, the next step, which will teach you the language, is even more fun: Bootstrap your interpreter.