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(define-module (test lens)
:use-module (srfi srfi-64)
:use-module (srfi srfi-64 test-error)
:use-module (srfi srfi-88)
:use-module (hnh util lens))
(define first (ref 0))
(test-equal '((1)) (first '(((1)))))
(test-equal '((2)) (set '(((1))) (compose-lenses first first) 2))
(test-equal '(((2))) (set '(((1))) (compose-lenses first first first) 2))
;; (list-change (iota 10) 5 'Hello)
;; => (0 1 2 3 4 Hello 6 7 8 9)
(test-equal '(1 (10) 3) (set '(1 (2) 3) (compose-lenses (ref 1) (ref 0)) 10))
(test-equal '(1 (10) 3) (set '(1 (2) 3) (ref 1) (ref 0) 10))
;; (set (list (iota 10)) first first 11)
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