It was, but then diverged from r6rs and became it's own. One big things is that the cons cell is immutable by default (which means immutable lists), where schem

It was, but then diverged from r6rs and became it's own. One big things is that the cons cell is immutable by default (which means immutable lists), where scheme has set-car! and set-cdr! The racket team wrote a bit about it here: http://racket-lang.org/new-name.html http://racket-lang.org/new-name.html