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;; Filename : test-assoc.scm
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;; About : unit tests for assq, assv, assoc
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;; Copyright (C) 2006 YAMAMOTO Kengo <yamaken AT bp.iij4u.or.jp>
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;; Copyright (c) 2007 SigScheme Project <uim AT freedesktop.org>
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;; All rights reserved.
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;; Redistribution and use in source and binary forms, with or without
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;; modification, are permitted provided that the following conditions
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;; 1. Redistributions of source code must retain the above copyright
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;; notice, this list of conditions and the following disclaimer.
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;; 2. Redistributions in binary form must reproduce the above copyright
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;; notice, this list of conditions and the following disclaimer in the
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;; documentation and/or other materials provided with the distribution.
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;; 3. Neither the name of authors nor the names of its contributors
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;; may be used to endorse or promote products derived from this software
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;; without specific prior written permission.
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;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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;; IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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;; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
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;; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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;; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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(load "./test/unittest.scm")
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(define elm0 (lambda () #f))
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(define elm1 (lambda () #f))
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(define elm2 (lambda () #f))
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(define elm3 (lambda () #f))
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(define cdr3 (cons (cons elm3 3) nil))
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(define cdr2 (cons (cons elm2 2) cdr3))
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(define cdr1 (cons (cons elm1 1) cdr2))
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(define cdr0 (cons (cons elm0 0) cdr1))
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;; Remake char object to avoid constant optimization. If the implementation
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;; does not have neither immediate char nor preallocated char objects, (eq? c
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;; (char c)) will be false.
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(integer->char (char->integer c))))
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(assert-error (tn) (lambda () (assq 'a '(a))))
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(assert-error (tn) (lambda () (assq 'a '((A . 0) a))))
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(assert-false (tn) (assq 'a '()))
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(assert-equal? (tn) '(a . 0) (assq 'a '((a . 0))))
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(assert-false (tn) (assq 'b '((a . 0))))
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(assert-equal? (tn) '(A . 0) (assq 'A '((A . 0) (a . 1) (b . 2))))
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(assert-equal? (tn) '(a . 1) (assq 'a '((A . 0) (a . 1) (b . 2))))
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(assert-equal? (tn) '(b . 2) (assq 'b '((A . 0) (a . 1) (b . 2))))
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(assert-false (tn) (assq 'c '((A . 0) (a . 1) (b . 2))))
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(tn "assq builtin procedures")
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(assert-false (tn) (assq + (list)))
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(assert-equal? (tn) (cons + 0) (assq + (list (cons + 0))))
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(assert-false (tn) (assq - (list (cons + 0))))
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(assert-equal? (tn) (cons + 0) (assq + (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (cons - 1) (assq - (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (cons * 2) (assq * (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-false (tn) (assq / (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (car cdr3) (assq elm3 alist))
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(assert-equal? (tn) (car cdr2) (assq elm2 alist))
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(assert-equal? (tn) (car cdr1) (assq elm1 alist))
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(assert-equal? (tn) (car cdr0) (assq elm0 alist))
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(assert-false (tn) (assq (lambda() #f) alist))
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(tn "assq strings with non-constant key")
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;; These tests assume that (string #\a) is not optimized as constant string.
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(assert-false (tn) (assq (string #\a) '()))
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(assert-false (tn) (assq (string #\a) '(("a" . a))))
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(assert-false (tn) (assq (string #\b) '(("a" . a))))
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(assert-false (tn) (assq (string #\a) '(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assq (string #\b) '(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assq (string #\c) '(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assq (string #\d) '(("a" . a) ("b" . b) ("c" . c))))
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(tn "assq lists with non-constant key")
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;; These tests assume that the keys are not optimized as constant object.
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(assert-false (tn) (assq (list (string #\a)) '()))
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(assert-false (tn) (assq (list (string #\a)) '((("a") . a))))
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(assert-false (tn) (assq (list (string #\b)) '((("a") . a))))
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(assert-false (tn) (assq (list (string #\a))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assq (list (string #\b))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assq (list (string #\c))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assq (list (string #\d))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assq (list (string #\a #\B #\c)
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(list (string #\d) (list (string #\e))))
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'((("aBc" ("d" ("E"))) 0)
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(("aBc" ("d" ("e"))) 1)
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(tn "assq improper lists: symbols")
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(assert-error (tn) (lambda () (assq 'a 'a)))
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(assert-equal? (tn) '(a . 1) (assq 'a '((A . 0) (a . 1) (b . 2) . 3)))
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(assert-error (tn) (lambda () (assq 'c '((A . 0) (a . 1) (b . 2) . 3))))
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(tn "assq improper lists: builtin procedures")
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(assert-error (tn) (lambda () (assq '+ '+)))
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(assert-equal? (tn) '(- . 1) (assq '- '((+ . 0) (- . 1) (* . 2) . 3)))
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(assert-error (tn) (lambda () (assq '/ '((+ . 0) (- . 1) (* . 2) . 3))))
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(tn "assq improper lists: strings")
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(assert-error (tn) (lambda () (assq (string #\b)
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'(("a" . 0) ("b" . 1) ("c" . 2) . 3))))
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(tn "assq improper lists: lists")
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(assert-error (tn) (lambda ()
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(assq (list (string #\b))
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'((("a") . 0) (("b") . 1) (("c") . 2) . 3))))
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(tn "assq from R5RS examples")
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(define e '((a 1) (b 2) (c 3)))
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(assert-equal? (tn) '(a 1) (assq 'a e))
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(assert-equal? (tn) '(b 2) (assq 'b e))
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(assert-false (tn) (assq 'd e))
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(assert-false (tn) (assq (list 'a) '(((a)) ((b)) ((c)))))
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(assert-error (tn) (lambda () (assv 'a '(a))))
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(assert-error (tn) (lambda () (assv 'a '((A . 0) a))))
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(assert-false (tn) (assv 'a '()))
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(assert-equal? (tn) '(a . 0) (assv 'a '((a . 0))))
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(assert-false (tn) (assv 'b '((a . 0))))
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(assert-equal? (tn) '(A . 0) (assv 'A '((A . 0) (a . 1) (b . 2))))
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(assert-equal? (tn) '(a . 1) (assv 'a '((A . 0) (a . 1) (b . 2))))
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(assert-equal? (tn) '(b . 2) (assv 'b '((A . 0) (a . 1) (b . 2))))
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(assert-false (tn) (assv 'c '((A . 0) (a . 1) (b . 2))))
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(tn "assv builtin procedures")
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(assert-false (tn) (assv + (list)))
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(assert-equal? (tn) (cons + 0) (assv + (list (cons + 0))))
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(assert-false (tn) (assv - (list (cons + 0))))
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(assert-equal? (tn) (cons + 0) (assv + (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (cons - 1) (assv - (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (cons * 2) (assv * (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-false (tn) (assv / (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (car cdr3) (assv elm3 alist))
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(assert-equal? (tn) (car cdr2) (assv elm2 alist))
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(assert-equal? (tn) (car cdr1) (assv elm1 alist))
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(assert-equal? (tn) (car cdr0) (assv elm0 alist))
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(assert-false (tn) (assv (lambda() #f) alist))
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(assert-false (tn) (assv 0 '()))
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(assert-equal? (tn) '(0 . a) (assv 0 '((0 . a))))
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(assert-false (tn) (assv 1 '((0 . a))))
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(assert-equal? (tn) '(0 . a) (assv 0 '((0 . a) (1 . b) (2 . c))))
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(assert-equal? (tn) '(1 . b) (assv 1 '((0 . a) (1 . b) (2 . c))))
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(assert-equal? (tn) '(2 . c) (assv 2 '((0 . a) (1 . b) (2 . c))))
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(assert-false (tn) (assv 3 '((0 . a) (1 . b) (2 . c))))
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(assert-equal? (tn) '(5 7) (assv 5 '((2 3) (5 7) (11 13)))) ;; R5RS
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(assert-false (tn) (assv #\a '()))
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(assert-equal? (tn) '(#\a . a) (assv #\a '((#\a . a))))
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(assert-false (tn) (assv #\b '((#\a . a))))
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(assert-equal? (tn) '(#\a . a) (assv #\a '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\b . b) (assv #\b '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\c . c) (assv #\c '((#\a . a) (#\b . b) (#\c . c))))
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(assert-false (tn) (assv #\d '((#\a . a) (#\b . b) (#\c . c))))
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(tn "assv chars with non-constant key")
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(assert-false (tn) (assv (char #\a) '()))
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(assert-equal? (tn) '(#\a . a) (assv (char #\a) '((#\a . a))))
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(assert-false (tn) (assv (char #\b) '((#\a . a))))
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(assert-equal? (tn) '(#\a . a) (assv (char #\a) '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\b . b) (assv (char #\b) '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\c . c) (assv (char #\c) '((#\a . a) (#\b . b) (#\c . c))))
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(assert-false (tn) (assv (char #\d) '((#\a . a) (#\b . b) (#\c . c))))
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(tn "assv strings with non-constant key")
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;; These tests assume that (string #\a) is not optimized as constant string.
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(assert-false (tn) (assv (string #\a) '()))
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(assert-false (tn) (assv (string #\a) '(("a" . a))))
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(assert-false (tn) (assv (string #\b) '(("a" . a))))
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(assert-false (tn) (assv (string #\a) '(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assv (string #\b) '(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assv (string #\c) '(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assv (string #\d) '(("a" . a) ("b" . b) ("c" . c))))
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(tn "assv lists with non-constant key")
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;; These tests assume that the keys are not optimized as constant object.
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(assert-false (tn) (assv (list (string #\a)) '()))
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(assert-false (tn) (assv (list (string #\a)) '((("a") . a))))
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(assert-false (tn) (assv (list (string #\b)) '((("a") . a))))
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(assert-false (tn) (assv (list (string #\a))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assv (list (string #\b))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assv (list (string #\c))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assv (list (string #\d))
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'((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assv (list (string #\a #\B #\c)
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(list (string #\d) (list (string #\e))))
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'((("aBc" ("d" ("E"))) 0)
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(("aBc" ("d" ("e"))) 1)
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(tn "assv improper lists: symbols")
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(assert-error (tn) (lambda () (assv 'a 'a)))
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(assert-equal? (tn) '(a . 1) (assv 'a '((A . 0) (a . 1) (b . 2) . 3)))
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(assert-error (tn) (lambda () (assv 'c '((A . 0) (a . 1) (b . 2) . 3))))
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(tn "assv improper lists: builtin procedures")
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(assert-error (tn) (lambda () (assv '+ '+)))
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(assert-equal? (tn) '(- . 1) (assv '- '((+ . 0) (- . 1) (* . 2) . 3)))
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(assert-error (tn) (lambda () (assv '/ '((+ . 0) (- . 1) (* . 2) . 3))))
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(tn "assv improper lists: numbers")
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(assert-error (tn) (lambda () (assv 0 '0)))
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(assert-equal? (tn) '(1 . b) (assv 1 '((0 . a) (1 . b) (3 . c) . d)))
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(assert-error (tn) (lambda () (assv 4 '((0 . a) (1 . b) (3 . c) . d))))
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(tn "assv improper lists: chars")
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(assert-error (tn) (lambda () (assv #\a #\a)))
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(assert-equal? (tn) '(#\b . 1) (assv #\b
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'((#\a . 0) (#\b . 1) (#\c . 2) . 3)))
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(assert-equal? (tn) '(#\b . 1) (assv (char #\b)
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'((#\a . 0) (#\b . 1) (#\c . 2) . 3)))
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(assert-error (tn) (lambda () (assv #\d
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'((#\a . 0) (#\b . 1) (#\c . 2) . 3))))
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(tn "assv improper lists: strings")
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(assert-error (tn) (lambda () (assv (string #\b)
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'(("a" . 0) ("b" . 1) ("c" . 2) . 3))))
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(tn "assv improper lists: lists")
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(assert-error (tn) (lambda ()
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(assv (list (string #\b))
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'((("a") . 0) (("b") . 1) (("c") . 2) . 3))))
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(assert-error (tn) (lambda () (assoc 'a '(a))))
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(assert-error (tn) (lambda () (assoc 'a '((A . 0) a))))
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(assert-false (tn) (assoc 'a '()))
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(assert-equal? (tn) '(a . 0) (assoc 'a '((a . 0))))
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(assert-false (tn) (assoc 'b '((a . 0))))
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(assert-equal? (tn) '(A . 0) (assoc 'A '((A . 0) (a . 1) (b . 2))))
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(assert-equal? (tn) '(a . 1) (assoc 'a '((A . 0) (a . 1) (b . 2))))
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(assert-equal? (tn) '(b . 2) (assoc 'b '((A . 0) (a . 1) (b . 2))))
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(assert-false (tn) (assoc 'c '((A . 0) (a . 1) (b . 2))))
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(tn "assoc builtin procedures")
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(assert-false (tn) (assoc + (list)))
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(assert-equal? (tn) (cons + 0) (assoc + (list (cons + 0))))
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(assert-false (tn) (assoc - (list (cons + 0))))
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(assert-equal? (tn) (cons + 0) (assoc + (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (cons - 1) (assoc - (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-equal? (tn) (cons * 2) (assoc * (list (cons + 0) (cons - 1) (cons * 2))))
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(assert-false (tn) (assoc / (list (cons + 0) (cons - 1) (cons * 2))))
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(tn "assoc closures")
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(assert-equal? (tn) (car cdr3) (assoc elm3 alist))
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(assert-equal? (tn) (car cdr2) (assoc elm2 alist))
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(assert-equal? (tn) (car cdr1) (assoc elm1 alist))
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(assert-equal? (tn) (car cdr0) (assoc elm0 alist))
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(assert-false (tn) (assoc (lambda() #f) alist))
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(assert-false (tn) (assoc 0 '()))
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(assert-equal? (tn) '(0 . a) (assoc 0 '((0 . a))))
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(assert-false (tn) (assoc 1 '((0 . a))))
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(assert-equal? (tn) '(0 . a) (assoc 0 '((0 . a) (1 . b) (2 . c))))
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(assert-equal? (tn) '(1 . b) (assoc 1 '((0 . a) (1 . b) (2 . c))))
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(assert-equal? (tn) '(2 . c) (assoc 2 '((0 . a) (1 . b) (2 . c))))
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(assert-false (tn) (assoc 3 '((0 . a) (1 . b) (2 . c))))
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(assert-equal? (tn) '(5 7) (assoc 5 '((2 3) (5 7) (11 13)))) ;; R5RS
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(assert-false (tn) (assoc #\a '()))
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(assert-equal? (tn) '(#\a . a) (assoc #\a '((#\a . a))))
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(assert-false (tn) (assoc #\b '((#\a . a))))
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(assert-equal? (tn) '(#\a . a) (assoc #\a '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\b . b) (assoc #\b '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\c . c) (assoc #\c '((#\a . a) (#\b . b) (#\c . c))))
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(assert-false (tn) (assoc #\d '((#\a . a) (#\b . b) (#\c . c))))
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(tn "assoc chars with non-constant key")
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(assert-false (tn) (assoc (char #\a) '()))
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(assert-equal? (tn) '(#\a . a) (assoc (char #\a) '((#\a . a))))
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(assert-false (tn) (assoc (char #\b) '((#\a . a))))
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(assert-equal? (tn) '(#\a . a) (assoc (char #\a) '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\b . b) (assoc (char #\b) '((#\a . a) (#\b . b) (#\c . c))))
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(assert-equal? (tn) '(#\c . c) (assoc (char #\c) '((#\a . a) (#\b . b) (#\c . c))))
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(assert-false (tn) (assoc (char #\d) '((#\a . a) (#\b . b) (#\c . c))))
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(assert-false (tn) (assoc "a" '()))
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(assert-equal? (tn) '("a" . a) (assoc "a" '(("a" . a))))
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(assert-false (tn) (assoc "b" '(("a" . a))))
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(assert-equal? (tn) '("a" . a) (assoc "a" '(("a" . a) ("b" . b) ("c" . c))))
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(assert-equal? (tn) '("b" . b) (assoc "b" '(("a" . a) ("b" . b) ("c" . c))))
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(assert-equal? (tn) '("c" . c) (assoc "c" '(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assoc "d" '(("a" . a) ("b" . b) ("c" . c))))
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(tn "assoc strings with non-constant key")
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;; These tests assume that (string #\a) is not optimized as constant string.
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(assert-false (tn) (assoc (string #\a) '()))
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(assert-equal? (tn) '("a" . a) (assoc (string #\a) '(("a" . a))))
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(assert-false (tn) (assoc (string #\b) '(("a" . a))))
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(assert-equal? (tn) '("a" . a) (assoc (string #\a)
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'(("a" . a) ("b" . b) ("c" . c))))
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(assert-equal? (tn) '("b" . b) (assoc (string #\b)
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'(("a" . a) ("b" . b) ("c" . c))))
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(assert-equal? (tn) '("c" . c) (assoc (string #\c)
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'(("a" . a) ("b" . b) ("c" . c))))
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(assert-false (tn) (assoc (string #\d)
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'(("a" . a) ("b" . b) ("c" . c))))
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;; These tests assume that the keys are not optimized as constant object.
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(assert-false (tn) (assoc '("a") '()))
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(assert-equal? (tn) '(("a") . a) (assoc '("a") '((("a") . a))))
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(assert-false (tn) (assoc '("b") '((("a") . a))))
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(assert-equal? (tn) '(("a") . a) (assoc '("a") '((("a") . a) (("b") . b) (("c") . c))))
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(assert-equal? (tn) '(("b") . b) (assoc '("b") '((("a") . a) (("b") . b) (("c") . c))))
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(assert-equal? (tn) '(("c") . c) (assoc '("c") '((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assoc '("d") '((("a") . a) (("b") . b) (("c") . c))))
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'(("aBc" ("d" ("e"))) 1)
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(assoc '("aBc" ("d" ("e")))
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'((("aBc" ("d" ("E"))) 0)
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(("aBc" ("d" ("e"))) 1)
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(tn "assoc lists with non-constant key")
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(assert-false (tn) (assoc (list (string #\a)) '()))
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(assert-equal? (tn) '(("a") . a) (assoc (list (string #\a)) '((("a") . a))))
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(assert-false (tn) (assoc (list (string #\b)) '((("a") . a))))
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(assert-equal? (tn) '(("a") . a) (assoc (list (string #\a)) '((("a") . a) (("b") . b) (("c") . c))))
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(assert-equal? (tn) '(("b") . b) (assoc (list (string #\b)) '((("a") . a) (("b") . b) (("c") . c))))
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(assert-equal? (tn) '(("c") . c) (assoc (list (string #\c)) '((("a") . a) (("b") . b) (("c") . c))))
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(assert-false (tn) (assoc (list (string #\d)) '((("a") . a) (("b") . b) (("c") . c))))
345
'(("aBc" ("d" ("e"))) 1)
346
(assoc (list (string #\a #\B #\c)
347
(list (string #\d) (list (string #\e))))
348
'((("aBc" ("d" ("E"))) 0)
349
(("aBc" ("d" ("e"))) 1)
352
(assert-equal? (tn) '((a)) (assoc (list 'a) '(((a)) ((b)) ((c))))) ;; R5RS
354
(tn "assoc improper lists: symbols")
355
(assert-error (tn) (lambda () (assoc 'a 'a)))
356
(assert-equal? (tn) '(a . 1) (assoc 'a '((A . 0) (a . 1) (b . 2) . 3)))
357
(assert-error (tn) (lambda () (assoc 'c '((A . 0) (a . 1) (b . 2) . 3))))
358
(tn "assoc improper lists: builtin procedures")
359
(assert-error (tn) (lambda () (assoc '+ '+)))
360
(assert-equal? (tn) '(- . 1) (assoc '- '((+ . 0) (- . 1) (* . 2) . 3)))
361
(assert-error (tn) (lambda () (assoc '/ '((+ . 0) (- . 1) (* . 2) . 3))))
362
(tn "assoc improper lists: numbers")
363
(assert-error (tn) (lambda () (assoc 0 '0)))
364
(assert-equal? (tn) '(1 . b) (assoc 1 '((0 . a) (1 . b) (3 . c) . d)))
365
(assert-error (tn) (lambda () (assoc 4 '((0 . a) (1 . b) (3 . c) . d))))
366
(tn "assoc improper lists: chars")
367
(assert-error (tn) (lambda () (assoc #\a #\a)))
368
(assert-equal? (tn) '(#\b . 1) (assoc #\b
369
'((#\a . 0) (#\b . 1) (#\c . 2) . 3)))
370
(assert-equal? (tn) '(#\b . 1) (assoc (char #\b)
371
'((#\a . 0) (#\b . 1) (#\c . 2) . 3)))
372
(assert-error (tn) (lambda () (assoc #\d
373
'((#\a . 0) (#\b . 1) (#\c . 2) . 3))))
374
(tn "assoc improper lists: strings")
375
(assert-error (tn) (lambda () (assoc "a" "a")))
376
(assert-equal? (tn) '("b" . 1) (assoc "b"
377
'(("a" . 0) ("b" . 1) ("c" . 2) . 3)))
378
(assert-equal? (tn) '("b" . 1) (assoc (string #\b)
379
'(("a" . 0) ("b" . 1) ("c" . 2) . 3)))
380
(assert-error (tn) (lambda () (assoc "d"
381
'(("a" . 0) ("b" . 1) ("c" . 2) . 3))))
382
(tn "assoc improper lists: lists")
383
(assert-error (tn) (lambda () (assoc ("a") ("a"))))
386
(assoc '("b") '((("a") . 0) (("b") . 1) (("c") . 2) . 3)))
389
(assoc (list (string #\b))
390
'((("a") . 0) (("b") . 1) (("c") . 2) . 3)))
393
(assoc ("d") '((("a") . 0) (("b") . 1) (("c") . 2) . 3))))