{"by":"fiddlerwoaroof","id":18843232,"kids":[18843341],"parent":18842694,"text":"Scheme's conses are mutable: r7rs (and the previous standards) define set-car! and set-cdr! to mutate the parts of the conses. One of the reasons why Racket is not a Scheme is that Racket's conses are immutable.","time":1546842568,"type":"comment"}