test-suite/tests/elisp-compiler.test

   1 ;;;; elisp-compiler.test --- Test the compiler for Elisp.  -*- scheme -*-
   2 ;;;;
   3 ;;;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   4 ;;;; Daniel Kraft
   5 ;;;;
   6 ;;;; This library is free software; you can redistribute it and/or
   7 ;;;; modify it under the terms of the GNU Lesser General Public
   8 ;;;; License as published by the Free Software Foundation; either
   9 ;;;; version 3 of the License, or (at your option) any later version.
  10 ;;;;
  11 ;;;; This library is distributed in the hope that it will be useful,
  12 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 ;;;; Lesser General Public License for more details.
  15 ;;;;
  16 ;;;; You should have received a copy of the GNU Lesser General Public
  17 ;;;; License along with this library; if not, write to the Free Software
  18 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19
  20 (define-module (test-elisp-compiler)
  21   :use-module (test-suite lib)
  22   :use-module (system base compile)
  23   :use-module (language elisp runtime))
  24
  25
  26 ; Macros to handle the compilation conveniently.
  27
  28 (define-syntax compile-test
  29   (syntax-rules (pass-if pass-if-equal pass-if-exception)
  30     ((_ (pass-if test-name exp))
  31      (pass-if test-name (compile 'exp #:from 'elisp #:to 'value)))
  32     ((_ (pass-if test-name exp #:opts opts))
  33      (pass-if test-name (compile 'exp #:from 'elisp #:to 'value #:opts opts)))
  34     ((_ (pass-if-equal test-name result exp))
  35      (pass-if test-name (equal? result
  36                                 (compile 'exp #:from 'elisp #:to 'value))))
  37     ((_ (pass-if-exception test-name exc exp))
  38      (pass-if-exception test-name exc
  39                         (compile 'exp #:from 'elisp #:to 'value)))))
  40
  41 (define-syntax with-test-prefix/compile
  42   (syntax-rules ()
  43     ((_ section-name exp ...)
  44      (with-test-prefix section-name (compile-test exp) ...))))
  45
  46
  47 ; Test control structures.
  48 ; ========================
  49
  50 (compile '(%set-lexical-binding-mode #nil) #:from 'elisp #:to 'value)
  51
  52 (with-test-prefix/compile "Sequencing"
  53
  54   (pass-if-equal "progn" 1
  55     (progn (setq a 0)
  56            (setq a (1+ a))
  57            a))
  58
  59   (pass-if-equal "empty progn" #nil
  60     (progn))
  61
  62   (pass-if "prog1"
  63     (progn (setq a 0)
  64            (setq b (prog1 a (setq a (1+ a))))
  65            (and (= a 1) (= b 0))))
  66
  67   (pass-if "prog2"
  68     (progn (setq a 0)
  69            (setq b (prog2 (setq a (1+ a))
  70                           (setq a (1+ a))
  71                           (setq a (1+ a))))
  72            (and (= a 3) (= b 2)))))
  73
  74 (with-test-prefix/compile "Conditionals"
  75
  76   (pass-if-equal "succeeding if" 1
  77     (if t 1 2))
  78   (pass-if "failing if"
  79     (and (= (if nil
  80               1
  81               (setq a 2) (setq a (1+ a)) a)
  82             3)
  83          (equal (if nil 1) nil)))
  84
  85   (pass-if-equal "if with no else" #nil
  86     (if nil t))
  87
  88   (pass-if-equal "empty cond" nil-value
  89     (cond))
  90   (pass-if-equal "all failing cond" nil-value
  91     (cond (nil) (nil)))
  92   (pass-if-equal "only condition" 5
  93     (cond (nil) (5)))
  94   (pass-if-equal "succeeding cond value" 42
  95     (cond (nil) (t 42) (t 0)))
  96   (pass-if-equal "succeeding cond side-effect" 42
  97     (progn (setq a 0)
  98            (cond (nil) (t (setq a 42) 1) (t (setq a 0)))
  99            a)))
 100
 101 (with-test-prefix/compile "Combining Conditions"
 102
 103   (pass-if-equal "empty and" t-value (and))
 104   (pass-if-equal "failing and" nil-value (and 1 2 nil 3))
 105   (pass-if-equal "succeeding and" 3 (and 1 2 3))
 106
 107   (pass-if-equal "empty or" nil-value (or))
 108   (pass-if-equal "failing or" nil-value (or nil nil nil))
 109   (pass-if-equal "succeeding or" 1 (or nil 1 nil 2 nil 3))
 110
 111   (pass-if-equal "not true" nil-value (not 1))
 112   (pass-if-equal "not false" t-value (not nil)))
 113
 114 (with-test-prefix/compile "Iteration"
 115
 116   (pass-if-equal "failing while" 0
 117     (progn (setq a 0)
 118            (while nil (setq a 1))
 119            a))
 120   (pass-if-equal "running while" 120
 121     (progn (setq prod 1
 122                  i 1)
 123            (while (<= i 5)
 124              (setq prod (* i prod))
 125              (setq i (1+ i)))
 126            prod)))
 127
 128 (with-test-prefix/compile "Exceptions"
 129
 130   (pass-if "catch without exception"
 131     (and (setq a 0)
 132          (= (catch 'foobar
 133                    (setq a (1+ a))
 134                    (setq a (1+ a))
 135                    a)
 136             2)
 137          (= (catch (+ 1 2) a) 2)))
 138
 139   ; FIXME: Figure out how to do this...
 140   ;(pass-if-exception "uncaught exception" 'elisp-exception
 141   ;  (throw 'abc 1))
 142
 143   (pass-if "catch and throw"
 144     (and (setq mylist '(1 2))
 145          (= (catch 'abc (throw 'abc 2) 1) 2)
 146          (= (catch 'abc (catch 'def (throw 'abc (1+ 0)) 2) 3) 1)
 147          (= (catch 'abc (catch 'def (throw 'def 1) 2) 3) 3)
 148          (= (catch mylist (catch (list 1 2) (throw mylist 1) 2) 3) 1)))
 149
 150   (pass-if "unwind-protect"
 151     (progn (setq a 0 b 1 c 1)
 152            (catch 'exc
 153                   (unwind-protect (progn (setq a 1)
 154                                          (throw 'exc 0))
 155                                   (setq a 0)
 156                                   (setq b 0)))
 157            (unwind-protect nil (setq c 0))
 158            (and (= a 0) (= b 0) (= c 0)
 159                 (= (unwind-protect 42 1 2 3) 42)))))
 160
 161 (with-test-prefix/compile "Eval"
 162
 163   (pass-if-equal "basic eval" 3
 164     (progn (setq code '(+ 1 2))
 165            (eval code)))
 166
 167   (pass-if "real dynamic code"
 168     (and (setq a 1 b 1 c 1)
 169          (defun set-code (var val)
 170            (list 'setq var val))
 171          (= a 1) (= b 1) (= c 1)
 172          (eval (set-code 'a '(+ 2 3)))
 173          (eval (set-code 'c 42))
 174          (= a 5) (= b 1) (= c 42)))
 175
 176   ; Build code that recursively again and again calls eval.  What we want is
 177   ; something like:
 178   ; (eval '(1+ (eval '(1+ (eval 1)))))
 179   (pass-if "recursive eval"
 180     (progn (setq depth 10 i depth)
 181            (setq code '(eval 0))
 182            (while (not (zerop i))
 183              (setq code (#{`}# (eval (quote (1+ (#{,}# code))))))
 184              (setq i (1- i)))
 185            (= (eval code) depth))))
 186
 187
 188 ; Test handling of variables.
 189 ; ===========================
 190
 191 (with-test-prefix/compile "Variable Setting/Referencing"
 192
 193   ; TODO: Check for variable-void error
 194
 195   (pass-if-equal "setq and reference" 6
 196     (progn (setq a 1 b 2 c 3)
 197            (+ a b c)))
 198   (pass-if-equal "setq evaluation order" 1
 199     (progn (setq a 0 b 0)
 200            (setq a 1 b a)))
 201   (pass-if-equal "setq value" 2
 202     (progn (setq a 1 b 2)))
 203
 204   (pass-if "set and symbol-value"
 205     (progn (setq myvar 'a)
 206            (and (= (set myvar 42) 42)
 207                 (= a 42)
 208                 (= (symbol-value myvar) 42))))
 209   (pass-if "void variables"
 210     (progn (setq a 1 b 2)
 211            (and (eq (makunbound 'b) 'b)
 212                 (boundp 'a)
 213                 (not (boundp 'b))))))
 214
 215 (with-test-prefix/compile "Let and Let*"
 216
 217   (pass-if-equal "let without value" nil-value
 218     (let (a (b 5)) a))
 219   (pass-if-equal "basic let" 0
 220     (progn (setq a 0)
 221            (let ((a 1)
 222                  (b a))
 223              b)))
 224
 225   (pass-if-equal "empty let" #nil (let ()))
 226
 227   (pass-if "let*"
 228     (progn (setq a 0)
 229            (and (let* ((a 1)
 230                        (b a))
 231                   (= b 1))
 232                 (let* (a b)
 233                   (setq a 1 b 2)
 234                   (and (= a 1) (= b 2)))
 235                 (= a 0)
 236                 (not (boundp 'b)))))
 237
 238   (pass-if-equal "empty let*" #nil
 239     (let* ()))
 240
 241   (pass-if "local scope"
 242     (progn (setq a 0)
 243            (setq b (let (a)
 244                      (setq a 1)
 245                      a))
 246            (and (= a 0)
 247                 (= b 1)))))
 248
 249 (with-test-prefix/compile "Lexical Scoping"
 250
 251   (pass-if "basic let semantics"
 252     (and (setq a 1)
 253          (lexical-let ((a 2) (b a))
 254            (and (= a 2) (= b 1)))
 255          (lexical-let* ((a 2) (b a))
 256            (and (= a 2) (= b 2) (setq a 42) (= a 42)))
 257          (= a 1)))
 258
 259   (pass-if "lexical scope with lexical-let's"
 260     (and (setq a 1)
 261          (defun dyna () a)
 262          (lexical-let (a)
 263            (setq a 2)
 264            (and (= a 2) (= (dyna) 1)))
 265          (= a 1)
 266          (lexical-let* (a)
 267            (setq a 2)
 268            (and (= a 2) (= (dyna) 1)))
 269          (= a 1)))
 270
 271   (pass-if "lexical scoping vs. symbol-value / set"
 272     (and (setq a 1)
 273          (lexical-let ((a 2))
 274            (and (= a 2)
 275                 (= (symbol-value 'a) 1)
 276                 (set 'a 3)
 277                 (= a 2)
 278                 (= (symbol-value 'a) 3)))
 279          (= a 3)))
 280
 281   (pass-if "let inside lexical-let"
 282     (and (setq a 1 b 1)
 283          (defun dynvals () (cons a b))
 284          (lexical-let ((a 2))
 285            (and (= a 2) (equal (dynvals) '(1 . 1))
 286                 (let ((a 3) (b a))
 287                   (declare (lexical a))
 288                   (and (= a 3) (= b 2)
 289                        (equal (dynvals) '(1 . 2))))
 290                 (let* ((a 4) (b a))
 291                   (declare (lexical a))
 292                   (and (= a 4) (= b 4)
 293                        (equal (dynvals) '(1 . 4))))
 294                 (= a 2)))
 295          (= a 1)))
 296
 297   (pass-if "lambda args inside lexical-let"
 298     (and (setq a 1)
 299          (defun dyna () a)
 300          (lexical-let ((a 2) (b 42))
 301            (and (= a 2) (= (dyna) 1)
 302                 ((lambda (a)
 303                    (declare (lexical a))
 304                    (and (= a 3) (= b 42) (= (dyna) 1))) 3)
 305                 ((lambda () (let ((a 3))
 306                               (declare (lexical a))
 307                               (and (= a 3) (= (dyna) 1)))))
 308                 (= a 2) (= (dyna) 1)))
 309          (= a 1)))
 310
 311   (pass-if "closures"
 312     (and (defun make-counter ()
 313            (lexical-let ((cnt 0))
 314              (lambda ()
 315                (setq cnt (1+ cnt)))))
 316          (setq c1 (make-counter) c2 (make-counter))
 317          (= (funcall c1) 1)
 318          (= (funcall c1) 2)
 319          (= (funcall c1) 3)
 320          (= (funcall c2) 1)
 321          (= (funcall c2) 2)
 322          (= (funcall c1) 4)
 323          (= (funcall c2) 3)))
 324
 325   (pass-if "lexical lambda args"
 326     (progn (setq a 1 b 1)
 327            (defun dyna () a)
 328            (defun dynb () b)
 329            (lexical-let (a c)
 330              ((lambda (a b &optional c)
 331                 (declare (lexical a c))
 332                 (and (= a 3) (= (dyna) 1)
 333                      (= b 2) (= (dynb) 2)
 334                      (= c 1)))
 335               3 2 1))))
 336
 337   ; Check if a lambda without dynamically bound arguments
 338   ; is tail-optimized by doing a deep recursion that would otherwise overflow
 339   ; the stack.
 340   (pass-if "lexical lambda tail-recursion"
 341     (lexical-let (i)
 342       (setq to 1000000)
 343       (defun iteration-1 (i)
 344         (declare (lexical i))
 345         (if (< i to)
 346           (iteration-1 (1+ i))))
 347       (iteration-1 0)
 348       (setq x 0)
 349       (defun iteration-2 ()
 350         (if (< x to)
 351           (setq x (1+ x))
 352           (iteration-2)))
 353       (iteration-2)
 354       t)))
 355
 356
 357 (with-test-prefix/compile "defconst and defvar"
 358
 359   (pass-if-equal "defconst without docstring" 3.141
 360     (progn (setq pi 3)
 361            (defconst pi 3.141)
 362            pi))
 363   (pass-if-equal "defconst value" 'pi
 364     (defconst pi 3.141 "Pi"))
 365
 366   (pass-if-equal "defvar without value" 42
 367     (progn (setq a 42)
 368            (defvar a)
 369            a))
 370   (pass-if-equal "defvar on already defined variable" 42
 371     (progn (setq a 42)
 372            (defvar a 1 "Some docstring is also ok")
 373            a))
 374   (pass-if-equal "defvar on undefined variable" 1
 375     (progn (makunbound 'a)
 376            (defvar a 1)
 377            a))
 378   (pass-if-equal "defvar value" 'a
 379     (defvar a)))
 380
 381
 382 ; Functions and lambda expressions.
 383 ; =================================
 384
 385 (with-test-prefix/compile "Lambda Expressions"
 386
 387   (pass-if-equal "required arguments" 3
 388     ((lambda (a b c) c) 1 2 3))
 389
 390   (pass-if-equal "optional argument" 3
 391     ((lambda (a &optional b c) c) 1 2 3))
 392   (pass-if-equal "optional missing" nil-value
 393     ((lambda (&optional a) a)))
 394
 395   (pass-if-equal "rest argument" '(3 4 5)
 396     ((lambda (a b &rest c) c) 1 2 3 4 5))
 397   (pass-if "rest missing"
 398     (null ((lambda (a b &rest c) c) 1 2)))
 399
 400   (pass-if-equal "empty lambda" #nil
 401     ((lambda ()))))
 402
 403 (with-test-prefix/compile "Function Definitions"
 404
 405   (pass-if-equal "defun" 3
 406     (progn (defun test (a b) (+ a b))
 407            (test 1 2)))
 408   (pass-if-equal "defun value" 'test
 409     (defun test (a b) (+ a b)))
 410
 411   (pass-if "fset and symbol-function"
 412     (progn (setq myfunc 'x x 5)
 413            (and (= (fset myfunc 42) 42)
 414                 (= (symbol-function myfunc) 42)
 415                 (= x 5))))
 416   (pass-if "void function values"
 417     (progn (setq a 1)
 418            (defun test (a b) (+ a b))
 419            (fmakunbound 'a)
 420            (fset 'b 5)
 421            (and (fboundp 'b) (fboundp 'test)
 422                 (not (fboundp 'a))
 423                 (= a 1))))
 424
 425   (pass-if "flet"
 426     (progn (defun foobar () 42)
 427            (defun test () (foobar))
 428            (and (= (test) 42)
 429                 (flet ((foobar () 0)
 430                        (myfoo ()
 431                          (funcall (symbol-function 'foobar))))
 432                   (and (= (myfoo) 42)
 433                        (= (test) 42)))
 434                 (flet ((foobar () nil))
 435                   (defun foobar () 0)
 436                   (= (test) 42))
 437                 (= (test) 42)))))
 438
 439 (with-test-prefix/compile "Calling Functions"
 440
 441   (pass-if-equal "recursion" 120
 442     (progn (defun factorial (n prod)
 443              (if (zerop n)
 444                prod
 445                (factorial (1- n) (* prod n))))
 446            (factorial 5 1)))
 447
 448   (pass-if "dynamic scoping"
 449     (progn (setq a 0)
 450            (defun foo ()
 451              (setq a (1+ a))
 452              a)
 453            (defun bar (a)
 454              (foo))
 455            (and (= 43 (bar 42))
 456                 (zerop a))))
 457
 458   (pass-if "funcall and apply argument handling"
 459     (and (defun allid (&rest args) args)
 460          (setq allid-var (symbol-function 'allid))
 461          (equal (funcall allid-var 1 2 3) '(1 2 3))
 462          (equal (funcall allid-var) nil)
 463          (equal (funcall allid-var 1 2 '(3 4)) '(1 2 (3 4)))
 464          (equal (funcall allid-var '()) '(()))
 465          (equal (apply allid-var 1 2 '(3 4)) '(1 2 3 4))
 466          (equal (apply allid-var '(1 2)) '(1 2))
 467          (equal (apply allid-var '()) nil)))
 468
 469   (pass-if "raw functions with funcall"
 470     (and (= (funcall '+ 1 2) 3)
 471          (= (funcall (lambda (a b) (+ a b)) 1 2) 3)
 472          (= (funcall '(lambda (a b) (+ a b)) 1 2) 3))))
 473
 474
 475 ; Quoting and Backquotation.
 476 ; ==========================
 477
 478 (with-test-prefix/compile "Quotation"
 479
 480   (pass-if "quote"
 481     (and (equal '42 42) (equal '"abc" "abc")
 482          (equal '(1 2 (3 (4) x)) '(1 2 (3 (4) x)))
 483          (not (equal '(1 2 (3 4 (x))) '(1 2 3 4 x)))
 484          (equal '(1 2 . 3) '(1 2 . 3))))
 485
 486   (pass-if "simple backquote"
 487     (and (equal (#{`}# 42) 42)
 488          (equal (#{`}# (1 (a))) '(1 (a)))
 489          (equal (#{`}# (1 . 2)) '(1 . 2))))
 490   (pass-if "unquote"
 491     (progn (setq a 42 l '(18 12))
 492            (and (equal (#{`}# (#{,}# a)) 42)
 493                 (equal (#{`}# (1 a ((#{,}# l)) . (#{,}# a))) '(1 a ((18 12)) . 42)))))
 494   (pass-if "unquote splicing"
 495     (progn (setq l '(18 12) empty '())
 496            (and (equal (#{`}# (#{,@}# l)) '(18 12))
 497                 (equal (#{`}# (l 2 (3 (#{,@}# l)) ((#{,@}# l)) (#{,@}# l)))
 498                        '(l 2 (3 18 12) (18 12) 18 12))
 499                 (equal (#{`}# (1 2 (#{,@}# empty) 3)) '(1 2 3))))))
 500
 501
 502
 503 ; Macros.
 504 ; =======
 505
 506 (with-test-prefix/compile "Macros"
 507
 508   (pass-if-equal "defmacro value" 'magic-number
 509     (defmacro magic-number () 42))
 510
 511   (pass-if-equal "macro expansion" 1
 512     (progn (defmacro take-first (a b) a)
 513            (take-first 1 (/ 1 0)))))
 514
 515
 516 ; Test the built-ins.
 517 ; ===================
 518
 519 (with-test-prefix/compile "Equivalence Predicates"
 520
 521   (pass-if "equal"
 522     (and (equal 2 2) (not (equal 1 2))
 523          (equal "abc" "abc") (not (equal "abc" "ABC"))
 524          (equal 'abc 'abc) (not (equal 'abc 'def))
 525          (equal '(1 2 (3 4) 5) '(1 2 (3 4) 5))
 526          (not (equal '(1 2 3 4 5) '(1 2 (3 4) 5)))))
 527
 528   (pass-if "eq"
 529     (progn (setq some-list '(1 2))
 530            (setq some-string "abc")
 531            (and (eq 2 2) (not (eq 1 2))
 532                 (eq 'abc 'abc) (not (eq 'abc 'def))
 533                 (eq some-string some-string) (not (eq some-string (string 97 98 99)))
 534                 (eq some-list some-list) (not (eq some-list (list 1 2)))))))
 535
 536 (with-test-prefix/compile "Number Built-Ins"
 537
 538   (pass-if "floatp"
 539     (and (floatp 1.0) (not (floatp 1)) (not (floatp 'a))))
 540   (pass-if "integerp"
 541     (and (integerp 42) (integerp -2) (not (integerp 1.0))))
 542   (pass-if "numberp"
 543     (and (numberp 1.0) (numberp -2) (not (numberp 'a))))
 544   (pass-if "wholenump"
 545     (and (wholenump 0) (not (wholenump -2)) (not (wholenump 1.0))))
 546   (pass-if "zerop"
 547     (and (zerop 0) (zerop 0.0) (not (zerop 1))))
 548
 549   (pass-if "comparisons"
 550     (and (= 1 1.0) (/= 0 1)
 551          (< 1 2) (> 2 1) (>= 1 1) (<= 1 1)
 552          (not (< 1 1)) (not (<= 2 1))))
 553
 554   (pass-if "max and min"
 555     (and (= (max -5 2 4.0 1) 4.0) (= (min -5 2 4.0 1) -5)
 556          (= (max 1) 1) (= (min 1) 1)))
 557   (pass-if "abs"
 558     (and (= (abs 1.0) 1.0) (= (abs -5) 5)))
 559
 560   (pass-if "float"
 561     (and (= (float 1) 1) (= (float 5.5) 5.5)
 562          (floatp (float 1))))
 563
 564   (pass-if-equal "basic arithmetic operators" -8.5
 565     (+ (1+ 0) (1- 0) (- 5.5) (* 2 -2) (- 2 1)))
 566   (pass-if "modulo"
 567     (= (% 5 3) 2))
 568
 569   (pass-if "floating point rounding"
 570     (and (= (ffloor 1.7) 1.0) (= (ffloor -1.2) -2.0) (= (ffloor 1.0) 1.0)
 571          (= (fceiling 1.2) 2.0) (= (fceiling -1.7) -1.0) (= (fceiling 1.0) 1.0)
 572          (= (ftruncate 1.6) 1.0) (= (ftruncate -1.7) -1.0)
 573          (= (fround 1.2) 1.0) (= (fround 1.7) 2.0) (= (fround -1.7) -2.0))))
 574
 575 (with-test-prefix/compile "List Built-Ins"
 576
 577   (pass-if "consp and atom"
 578     (and (consp '(1 2 3)) (consp '(1 2 . 3)) (consp '(a . b))
 579          (not (consp '())) (not (consp 1)) (not (consp "abc"))
 580          (atom 'a) (atom '()) (atom -1.5) (atom "abc")
 581          (not (atom '(1 . 2))) (not (atom '(1)))))
 582   (pass-if "listp and nlistp"
 583     (and (listp '(1 2 3)) (listp '(1)) (listp '()) (listp '(1 . 2))
 584          (not (listp 'a)) (not (listp 42)) (nlistp 42)
 585          (not (nlistp '())) (not (nlistp '(1 2 3))) (not (nlistp '(1 . 2)))))
 586   (pass-if "null"
 587     (and (null '()) (not (null 1)) (not (null '(1 2))) (not (null '(1 . 2)))))
 588
 589   (pass-if "car and cdr"
 590     (and (equal (car '(1 2 3)) 1) (equal (cdr '(1 2 3)) '(2 3))
 591          (equal (car '()) nil) (equal (cdr '()) nil)
 592          (equal (car '(1 . 2)) 1) (equal (cdr '(1 . 2)) 2)
 593          (null (cdr '(1)))))
 594   (pass-if "car-safe and cdr-safe"
 595     (and (equal (car-safe '(1 2)) 1) (equal (cdr-safe '(1 2)) '(2))
 596          (equal (car-safe 5) nil) (equal (cdr-safe 5) nil)))
 597
 598   (pass-if "nth and nthcdr"
 599     (and (equal (nth -5 '(1 2 3)) 1) (equal (nth 3 '(1 2 3)) nil)
 600          (equal (nth 0 '(1 2 3)) 1) (equal (nth 2 '(1 2 3)) 3)
 601          (equal (nthcdr -5 '(1 2 3)) '(1 2 3))
 602          (equal (nthcdr 4 '(1 2 3)) nil)
 603          (equal (nthcdr 1 '(1 2 3)) '(2 3))
 604          (equal (nthcdr 2 '(1 2 3)) '(3))))
 605
 606   (pass-if "length"
 607     (and (= (length '()) 0)
 608          (= (length '(1 2 3 4 5)) 5)
 609          (= (length '(1 2 (3 4 (5)) 6)) 4)))
 610
 611   (pass-if "cons, list and make-list"
 612     (and (equal (cons 1 2) '(1 . 2)) (equal (cons 1 '(2 3)) '(1 2 3))
 613          (equal (cons 1 '()) '(1))
 614          (equal (list 'a) '(a)) (equal (list) '()) (equal (list 1 2) '(1 2))
 615          (equal (make-list 3 42) '(42 42 42))
 616          (equal (make-list 0 1) '())))
 617   (pass-if "append"
 618     (and (equal (append '(1 2) '(3 4) '(5)) '(1 2 3 4 5))
 619          (equal (append '(1 2) 3) '(1 2 . 3))))
 620   (pass-if "reverse"
 621     (and (equal (reverse '(5 4 3 2 1)) '(1 2 3 4 5))
 622          (equal (reverse '()) '())))
 623   (pass-if "setcar and setcdr"
 624     (progn (setq pair '(1 . 2))
 625            (setq copy pair)
 626            (setq a (setcar copy 3))
 627            (setq b (setcdr copy 4))
 628            (and (= a 3) (= b 4)
 629                 (equal pair '(3 . 4))))))