Like most of these tutorials, this stops right where things get interesting. Taill-Call Optimization, Continuations, CPS, Call/CC... those are the things that a

Like most of these tutorials, this stops right where things get interesting. Taill-Call Optimization, Continuations, CPS, Call/CC... those are the things that are tricky to implement and without those the language is only a toy language. Then again, creating a toy-language is a worthwhile goal in itself, so kudos to everyone who follows this through to the end