Question

Hello, everyone. One question: what's the difference between '(1 5) and (list 1 5) in below context:
(define (fun) '(1 5))
(set-car! (fun) 10)
(fun) ;;==>(10 5), (fun) changed!
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (fun) (list 1 5))
(set-car! (fun) 10)
(fun) ;;==>(1 5), (fun) not changed!

Answer 1

I guess they behave differently because list is a procedure, but quote is a special form. '(1 5) is equivalent to (quote (1 5)). If you define a variable instead of a procedure, like this: (define fun '(1 5)), then (set-car! fun 10) behaves identically in both cases.