Strange behavior

[cameyo]

Code Select Expand

(define (test a) (extend '() (sequence 1 a)))
(test 4)
;-> (1 2 3 4)
(test 4)
;-> (1 2 3 4 1 2 3 4)
(test 4)
;-> (1 2 3 4 1 2 3 4 1 2 3 4)
test
;-> (lambda (a) (extend '(1 2 3 4 1 2 3 4) (sequence 1 a)))