You might find MIT Scheme interesting, because it has a built-in Emacs clone. Just call (edit) and you're in. I think what it really comes down to is that writ

You might find MIT Scheme interesting, because it has a built-in Emacs clone. Just call (edit) and you're in. I think what it really comes down to is that writing and maintaining an editor (especially a good one) is a very large task. A language that lets you use an editor you already like thus has a double advantage, with the possible downside that the integration won't be as good as possible. SLIME is pretty nice though.