2 (cons 17 42) -> (17 . 42)
3 (car (cons 17 42)) -> 17
5 cons -> builtin-function
6 lambda -> builtin-macro
7 (lambda () 42) -> user-function
9 ((lambda (a) (+ 2 a)) 17) -> 19
11 (quote (a b c)) -> (a b c)
16 (eq? (cons 2 3) (cons 2 3)) -> #f
17 (eq? (quote foo) (quote foo)) -> #t
18 (eq? (quote foo) (quote bar)) -> #f
19 (eq? "foo" "foo") -> #f