tests/seq.impure.lisp

   1 ;;;; tests related to sequences
   2
   3 ;;;; This file is impure because we want to be able to use DEFUN.
   4
   5 ;;;; This software is part of the SBCL system. See the README file for
   6 ;;;; more information.
   7 ;;;;
   8 ;;;; While most of SBCL is derived from the CMU CL system, the test
   9 ;;;; files (like this one) were written from scratch after the fork
  10 ;;;; from CMU CL.
  11 ;;;;
  12 ;;;; This software is in the public domain and is provided with
  13 ;;;; absolutely no warranty. See the COPYING and CREDITS files for
  14 ;;;; more information.
  15
  16 (in-package :cl-user)
  17
  18 (load "assertoid.lisp")
  19 (use-package "ASSERTOID")
  20
  21 ;;; helper functions for exercising SEQUENCE code on data of many
  22 ;;; specialized types, and in many different optimization scenarios
  23 (defun for-every-seq-1 (base-seq snippet)
  24   (dolist (seq-type '(list
  25                       (simple-array t 1)
  26                       (vector t)
  27                       (simple-array character 1)
  28                       (vector character)
  29                       (simple-array (signed-byte 4) 1)
  30                       (vector (signed-byte 4))))
  31     (flet ((entirely (eltype)
  32              (every (lambda (el) (typep el eltype)) base-seq)))
  33       (dolist (declaredness '(nil t))
  34         (dolist (optimization '(((speed 3) (space 0))
  35                                 ((speed 2) (space 2))
  36                                 ((speed 1) (space 2))
  37                                 ((speed 0) (space 1))))
  38           (let* ((seq (if (eq seq-type 'list)
  39                           (coerce base-seq 'list)
  40                           (destructuring-bind (type-first &rest type-rest)
  41                               seq-type
  42                             (ecase type-first
  43                               (simple-array
  44                                (destructuring-bind (eltype one) type-rest
  45                                  (assert (= one 1))
  46                                  (if (entirely eltype)
  47                                      (coerce base-seq seq-type)
  48                                      (return))))
  49                               (vector
  50                                (destructuring-bind (eltype) type-rest
  51                                  (if (entirely eltype)
  52                                      (let ((initial-element
  53                                             (cond ((subtypep eltype 'character)
  54                                                    #\!)
  55                                                   ((subtypep eltype 'number)
  56                                                    0)
  57                                                   (t #'error))))
  58                                        (replace (make-array
  59                                                  (+ (length base-seq)
  60                                                     (random 3))
  61                                                  :element-type eltype
  62                                                  :fill-pointer
  63                                                  (length base-seq)
  64                                                  :initial-element
  65                                                  initial-element)
  66                                                 base-seq))
  67                                      (return))))))))
  68                  (lambda-expr `(lambda (seq)
  69                                  ,@(when declaredness
  70                                      `((declare (type ,seq-type seq))))
  71                                  (declare (optimize ,@optimization))
  72                                  ,snippet)))
  73             (format t "~&~S~%" lambda-expr)
  74             (multiple-value-bind (fun warnings-p failure-p)
  75                 (compile nil lambda-expr)
  76               (when (or warnings-p failure-p)
  77                 (error "~@<failed compilation:~2I ~_LAMBDA-EXPR=~S ~_WARNINGS-P=~S ~_FAILURE-P=~S~:@>"
  78                        lambda-expr warnings-p failure-p))
  79               (format t "~&~S ~S~%~S~%~S ~S~%"
  80                       base-seq snippet seq-type declaredness optimization)
  81               (format t "~&(TYPEP SEQ 'SIMPLE-ARRAY)=~S~%"
  82                       (typep seq 'simple-array))
  83               (unless (funcall fun seq)
  84                 (error "~@<failed test:~2I ~_BASE-SEQ=~S ~_SNIPPET=~S ~_SEQ-TYPE=~S ~_DECLAREDNESS=~S ~_OPTIMIZATION=~S~:@>"
  85                        base-seq
  86                        snippet
  87                        seq-type
  88                        declaredness
  89                        optimization)))))))))
  90 (defun for-every-seq (base-seq snippets)
  91   (dolist (snippet snippets)
  92     (for-every-seq-1 base-seq snippet)))
  93
  94 ;;; a wrapper to hide declared type information from the compiler, so
  95 ;;; we don't get stopped by compiler warnings about e.g. compiling
  96 ;;; (POSITION 1 #() :KEY #'ABS) when #() has been coerced to a string.
  97 (defun indiscriminate (fun)
  98   (lambda (&rest rest) (apply fun rest)))
  99
 100 ;;; asymmetric test arg order example from ANSI FIND definition page
 101 (assert (eql #\space ; original example, depends on ASCII character ordering
 102              (find #\d "here are some letters that can be looked at"
 103                    :test #'char>)))
 104 (assert (eql #\e ; modified example, depends only on standard a-z ordering
 105              (find #\f "herearesomeletters" :test #'char>)))
 106 (assert (eql 4 ; modified more, avoids charset technicalities completely
 107              (find 5 '(6 4) :test '>)))
 108
 109 ;;; tests of FIND, POSITION, FIND-IF, and POSITION-IF (and a few for
 110 ;;; deprecated FIND-IF-NOT and POSITION-IF-NOT too)
 111 (for-every-seq #()
 112   '((null (find 1 seq))
 113     (null (find 1 seq :from-end t))
 114     (null (position 1 seq :key (indiscriminate #'abs)))
 115     (null (position nil seq :test (constantly t)))
 116     (null (position nil seq :test nil))
 117     (null (position nil seq :test-not nil))
 118     (null (find-if #'1+ seq :key (indiscriminate #'log)))
 119     (null (position-if #'identity seq :from-end t))
 120     (null (find-if-not #'packagep seq))
 121     (null (position-if-not #'packagep seq :key nil))))
 122 (for-every-seq #(1)
 123   '((null (find 2 seq))
 124     ;; Get the argument ordering for asymmetric tests like #'> right.
 125     ;; (bug reported and fixed by Alexey Dejneka sbcl-devel 2001-10-17)
 126     (eql 1 (find 2 seq :test #'>))
 127     (find 2 seq :key #'1+)
 128     (find 1 seq :from-end t)
 129     (null (find 1 seq :from-end t :start 1))
 130     (null (find 0 seq :from-end t))
 131     (eql 0 (position 1 seq :key #'abs))
 132     (null (position nil seq :test 'equal))
 133     (eql 1 (find-if #'1- seq :key #'log))
 134     (eql 0 (position-if #'identity seq :from-end t))
 135     (null (find-if-not #'sin seq))
 136     (eql 0 (position-if-not #'packagep seq :key 'identity))))
 137 (for-every-seq #(1 2 3 2 1)
 138   '((find 3 seq)
 139     (find 3 seq :from-end 'yes)
 140     (eql 1 (position 1.5 seq :test #'<))
 141     (eql 0 (position 0 seq :key '1-))
 142     (eql 4 (position 0 seq :key '1- :from-end t))
 143     (eql 2 (position 4 seq :key '1+))
 144     (eql 2 (position 4 seq :key '1+ :from-end t))
 145     (eql 1 (position 2 seq))
 146     (eql 1 (position 2 seq :start 1))
 147     (null (find 2 seq :start 1 :end 1))
 148     (eql 3 (position 2 seq :start 2))
 149     (eql 3 (position 2 seq :key nil :from-end t))
 150     (eql 2 (position 3 seq :test '=))
 151     (eql 0 (position 3 seq :test-not 'equalp))
 152     (eql 2 (position 3 seq :test 'equal :from-end t))
 153     (null (position 4 seq :test #'eql))
 154     (null (find-if #'packagep seq))
 155     (eql 1 (find-if #'plusp seq))
 156     (eql 3 (position-if #'plusp seq :key #'1- :from-end t))
 157     (eql 1 (position-if #'evenp seq))
 158     (eql 3 (position-if #'evenp seq :from-end t))
 159     (eql 2 (position-if #'plusp seq :from-end nil :key '1- :start 2))
 160     (eql 3 (position-if #'plusp seq :from-end t :key '1- :start 2))
 161     (null (position-if #'plusp seq :from-end t :key '1- :start 2 :end 2))
 162     (null (find-if-not #'plusp seq))
 163     (eql 0 (position-if-not #'evenp seq))))
 164 (for-every-seq "string test"
 165   '((null (find 0 seq))
 166     (null (find #\D seq :key #'char-upcase))
 167     (find #\E seq :key #'char-upcase)
 168     (null (find #\e seq :key #'char-upcase))
 169     (eql 3 (position #\i seq))
 170     (eql 0 (position #\s seq :key #'char-downcase))
 171     (eql 1 (position #\s seq :key #'char-downcase :test #'char/=))
 172     (eql 9 (position #\s seq :from-end t :test #'char=))
 173     (eql 10 (position #\s seq :from-end t :test #'char/=))
 174     (eql 4 (position #\N seq :from-end t :key 'char-upcase :test #'char-equal))
 175     (eql 5 (position-if (lambda (c) (equal #\g c)) seq))
 176     (eql 5 (position-if (lambda (c) (equal #\g c)) seq :from-end t))
 177     (find-if #'characterp seq)
 178     (find-if (lambda (c) (typep c 'base-char)) seq :from-end t)
 179     (null (find-if 'upper-case-p seq))))
 180
 181 ;;; SUBSEQ
 182 (let ((avec (make-array 10
 183                         :fill-pointer 4
 184                         :initial-contents '(0 1 2 3 iv v vi vii iix ix))))
 185   ;; These first five always worked AFAIK.
 186   (assert (equalp (subseq avec 0 3) #(0 1 2)))
 187   (assert (equalp (subseq avec 3 3) #()))
 188   (assert (equalp (subseq avec 1 3) #(1 2)))
 189   (assert (equalp (subseq avec 1) #(1 2 3)))
 190   (assert (equalp (subseq avec 1 4) #(1 2 3)))
 191   ;; SBCL bug found ca. 2002-05-01 by OpenMCL's correct handling of
 192   ;; SUBSEQ, CSR's driving portable cross-compilation far enough to
 193   ;; reach the SUBSEQ calls in assem.lisp, and WHN's sleazy
 194   ;; translation of old CMU CL new-assem.lisp into sufficiently grotty
 195   ;; portable Lisp that it passed suitable illegal values to SUBSEQ to
 196   ;; exercise the bug:-|
 197   ;;
 198   ;; SUBSEQ should check its END value against logical LENGTH, not
 199   ;; physical ARRAY-DIMENSION 0.
 200   ;;
 201   ;; fixed in sbcl-0.7.4.22 by WHN
 202   (assert (null (ignore-errors (aref (subseq avec 1 5) 0)))))
 203
 204 ;;; FILL
 205 (defun test-fill-typecheck (x)
 206   (declare (optimize (safety 3) (space 2) (speed 1)))
 207   (fill (make-string 10) x))
 208
 209 (assert (string= (test-fill-typecheck #\@) "@@@@@@@@@@"))
 210 ;;; BUG 186, fixed in sbcl-0.7.5.5
 211 (assert (null (ignore-errors (test-fill-typecheck 4097))))
 212
 213 ;;; MAKE-SEQUENCE, COERCE, CONCATENATE, MERGE, MAP and requested
 214 ;;; result type (BUGs 46a, 46b, 66)
 215 (macrolet ((assert-type-error (form)
 216              `(assert (typep (nth-value 1 (ignore-errors ,form))
 217                              'type-error))))
 218   (dolist (type-stub '((simple-vector)
 219                        (vector *)
 220                        (vector (signed-byte 8))
 221                        (vector (unsigned-byte 16))
 222                        (vector (signed-byte 32))
 223                        (simple-bit-vector)))
 224     (declare (optimize safety))
 225     (format t "~&~S~%" type-stub)
 226     ;; MAKE-SEQUENCE
 227     (assert (= (length (make-sequence `(,@type-stub) 10)) 10))
 228     (assert (= (length (make-sequence `(,@type-stub 10) 10)) 10))
 229     (assert-type-error (make-sequence `(,@type-stub 10) 11))
 230     ;; COERCE
 231     (assert (= (length (coerce '(0 0 0) `(,@type-stub))) 3))
 232     (assert (= (length (coerce #(0 0 0) `(,@type-stub 3))) 3))
 233     (assert-type-error (coerce #*111 `(,@type-stub 4)))
 234     ;; CONCATENATE
 235     (assert (= (length (concatenate `(,@type-stub) #(0 0 0) #*111)) 6))
 236     (assert (equalp (concatenate `(,@type-stub) #(0 0 0) #*111)
 237                    (coerce #(0 0 0 1 1 1) `(,@type-stub))))
 238     (assert (= (length (concatenate `(,@type-stub 6) #(0 0 0) #*111)) 6))
 239     (assert (equalp (concatenate `(,@type-stub 6) #(0 0 0) #*111)
 240                    (coerce #(0 0 0 1 1 1) `(,@type-stub 6))))
 241     (assert-type-error (concatenate `(,@type-stub 5) #(0 0 0) #*111))
 242     ;; MERGE
 243     (assert (= (length (merge `(,@type-stub) #(0 1 0) #*111 #'>)) 6))
 244     (assert (equalp (merge `(,@type-stub) #(0 1 0) #*111 #'>)
 245                    (coerce #(1 1 1 0 1 0) `(,@type-stub))))
 246     (assert (= (length (merge `(,@type-stub 6) #(0 1 0) #*111 #'>)) 6))
 247     (assert (equalp (merge `(,@type-stub 6) #(0 1 0) #*111 #'>)
 248                    (coerce #(1 1 1 0 1 0) `(,@type-stub 6))))
 249     (assert-type-error (merge `(,@type-stub 4) #(0 1 0) #*111 #'>))
 250     ;; MAP
 251     (assert (= (length (map `(,@type-stub) #'logxor #(0 0 1 1) '(0 1 0 1))) 4))
 252     (assert (equalp (map `(,@type-stub) #'logxor #(0 0 1 1) '(0 1 0 1))
 253                    (coerce #(0 1 1 0) `(,@type-stub))))
 254     (assert (= (length (map `(,@type-stub 4) #'logxor #(0 0 1 1) '(0 1 0 1)))
 255                4))
 256     (assert (equalp (map `(,@type-stub 4) #'logxor #(0 0 1 1) '(0 1 0 1))
 257                    (coerce #(0 1 1 0) `(,@type-stub 4))))
 258     (assert-type-error (map `(,@type-stub 5) #'logxor #(0 0 1 1) '(0 1 0 1))))
 259   ;; some more CONCATENATE tests for strings
 260   (locally
 261       (declare (optimize safety))
 262     (assert (string= (concatenate 'string "foo" " " "bar") "foo bar"))
 263     (assert (string= (concatenate '(string 7) "foo" " " "bar") "foo bar"))
 264     (assert-type-error (concatenate '(string 6) "foo" " " "bar"))
 265     (assert (string= (concatenate '(string 6) "foo" #(#\b #\a #\r)) "foobar"))
 266     (assert-type-error (concatenate '(string 7) "foo" #(#\b #\a #\r))))
 267   ;; Non-VECTOR ARRAY types aren't allowed as vector type specifiers.
 268   (locally
 269     (declare (optimize safety))
 270     (assert-type-error (concatenate 'simple-array "foo" "bar"))
 271     (assert-type-error (map 'simple-array #'identity '(1 2 3)))
 272     (assert (equalp #(11 13)
 273                     (map '(simple-array fixnum (*)) #'+ '(1 2 3) '(10 11))))
 274     (assert-type-error (coerce '(1 2 3) 'simple-array))
 275     (assert-type-error (merge 'simple-array '(1 3) '(2 4) '<))
 276     (assert (equalp #(3 2 1) (coerce '(3 2 1) '(vector fixnum))))
 277     (assert-type-error (map 'array #'identity '(1 2 3)))
 278     (assert-type-error (map '(array fixnum) #'identity '(1 2 3)))
 279     (assert (equalp #(1 2 3) (coerce '(1 2 3) '(vector fixnum))))
 280     ;; but COERCE has an exemption clause:
 281     (assert (string= "foo" (coerce "foo" 'simple-array)))
 282     ;; ... though not in all cases.
 283     (assert-type-error (coerce '(#\f #\o #\o) 'simple-array))))
 284
 285 ;;; As pointed out by Raymond Toy on #lisp IRC, MERGE had some issues
 286 ;;; with user-defined types until sbcl-0.7.8.11
 287 (deftype list-typeoid () 'list)
 288 (assert (equal '(1 2 3 4) (merge 'list-typeoid '(1 3) '(2 4) '<)))
 289 ;;; and also with types that weren't precicely LIST
 290 (assert (equal '(1 2 3 4) (merge 'cons '(1 3) '(2 4) '<)))
 291
 292 ;;; but wait, there's more! The NULL and CONS types also have implicit
 293 ;;; length requirements:
 294 (macrolet ((assert-type-error (form)
 295              `(assert (typep (nth-value 1 (ignore-errors ,form))
 296                              'type-error))))
 297   (locally
 298       (declare (optimize safety))
 299     ;; MAKE-SEQUENCE
 300     (assert-type-error (make-sequence 'cons 0))
 301     (assert-type-error (make-sequence 'null 1))
 302     (assert-type-error (make-sequence '(cons t null) 0))
 303     (assert-type-error (make-sequence '(cons t null) 2))
 304     ;; KLUDGE: I'm not certain that this test actually tests for what
 305     ;; it should test, in that the type deriver and optimizers might
 306     ;; be too smart for the good of an exhaustive test system.
 307     ;; However, it makes me feel good.  -- CSR, 2002-10-18
 308     (assert (null (make-sequence 'null 0)))
 309     (assert (= (length (make-sequence 'cons 3)) 3))
 310     (assert (= (length (make-sequence '(cons t null) 1)) 1))
 311     ;; and NIL is not a valid type for MAKE-SEQUENCE
 312     (assert-type-error (make-sequence 'nil 0))
 313     ;; COERCE
 314     (assert-type-error (coerce #(1) 'null))
 315     (assert-type-error (coerce #() 'cons))
 316     (assert-type-error (coerce #() '(cons t null)))
 317     (assert-type-error (coerce #(1 2) '(cons t null)))
 318     (assert (null (coerce #() 'null)))
 319     (assert (= (length (coerce #(1) 'cons)) 1))
 320     (assert (= (length (coerce #(1) '(cons t null))) 1))
 321     (assert-type-error (coerce #() 'nil))
 322     ;; MERGE
 323     (assert-type-error (merge 'null '(1 3) '(2 4) '<))
 324     (assert-type-error (merge 'cons () () '<))
 325     (assert (null (merge 'null () () '<)))
 326     (assert (= (length (merge 'cons '(1 3) '(2 4) '<)) 4))
 327     (assert (= (length (merge '(cons t (cons t (cons t (cons t null))))
 328                               '(1 3) '(2 4) '<)) 4))
 329     (assert-type-error (merge 'nil () () '<))
 330     ;; CONCATENATE
 331     (assert-type-error (concatenate 'null '(1) "2"))
 332     (assert-type-error (concatenate 'cons #() ()))
 333     (assert-type-error (concatenate '(cons t null) #(1 2 3) #(4 5 6)))
 334     (assert (null (concatenate 'null () #())))
 335     (assert (= (length (concatenate 'cons #() '(1) "2 3")) 4))
 336     (assert (= (length (concatenate '(cons t cons) '(1) "34")) 3))
 337     (assert-type-error (concatenate 'nil '(3)))
 338     ;; FIXME: tests for MAP to come when some brave soul implements
 339     ;; the analogous type checking for MAP/%MAP.
 340     ))
 341 \f
 342 ;;; ELT should signal an error of type TYPE-ERROR if its index
 343 ;;; argument isn't a valid sequence index for sequence:
 344 (defun test-elt-signal (x)
 345   (elt x 3))
 346 (assert (raises-error? (test-elt-signal "foo") type-error))
 347 (assert (eql (test-elt-signal "foob") #\b))
 348 (locally
 349   (declare (optimize (safety 3)))
 350   (assert (raises-error? (elt (list 1 2 3) 3) type-error)))
 351 \f
 352 ;;; confusion in the refactoring led to this signalling an unbound
 353 ;;; variable, not a type error.
 354 (defun svrefalike (x)
 355   (svref x 0))
 356 (assert (raises-error? (svrefalike #*0) type-error))
 357 \f
 358 ;;; checks for uniform bounding index handling under SAFETY 3 code.
 359 ;;;
 360 ;;; KLUDGE: not all in one big form because that causes SBCL to spend
 361 ;;; an absolute age trying to compile it.
 362 (defmacro sequence-bounding-indices-test (&body body)
 363   `(locally
 364     ;; See Issues 332 [and 333(!)] in the CLHS
 365     (declare (optimize (safety 3)))
 366     (let ((string (make-array 10
 367                               :fill-pointer 5
 368                               :initial-element #\a
 369                               :element-type 'base-char)))
 370       (flet ((reset ()
 371                (setf (fill-pointer string) 10)
 372                (fill string #\a)
 373                (setf (fill-pointer string) 5)))
 374         (declare (ignorable #'reset))
 375         ,@body))))
 376 (declaim (notinline opaque-identity))
 377 (defun opaque-identity (x) x)
 378 ;;; Accessor SUBSEQ
 379 (sequence-bounding-indices-test
 380  (format t "~&/Accessor SUBSEQ~%")
 381  (assert (string= (subseq string 0 5) "aaaaa"))
 382  (assert (raises-error? (subseq string 0 6)))
 383  (assert (raises-error? (subseq string (opaque-identity -1) 5)))
 384  (assert (raises-error? (subseq string 4 2)))
 385  (assert (raises-error? (subseq string 6)))
 386  (assert (string= (setf (subseq string 0 5) "abcde") "abcde"))
 387  (assert (string= (subseq string 0 5) "abcde"))
 388  (reset)
 389  (assert (raises-error? (setf (subseq string 0 6) "abcdef")))
 390  (assert (raises-error? (setf (subseq string (opaque-identity -1) 5) "abcdef")))
 391  (assert (raises-error? (setf (subseq string 4 2) "")))
 392  (assert (raises-error? (setf (subseq string 6) "ghij"))))
 393
 394 ;;; Function COUNT, COUNT-IF, COUNT-IF-NOT
 395 (sequence-bounding-indices-test
 396  (format t "~&/Function COUNT, COUNT-IF, COUNT-IF-NOT")
 397  (assert (= (count #\a string :start 0 :end nil) 5))
 398  (assert (= (count #\a string :start 0 :end 5) 5))
 399  (assert (raises-error? (count #\a string :start 0 :end 6)))
 400  (assert (raises-error? (count #\a string :start (opaque-identity -1) :end 5)))
 401  (assert (raises-error? (count #\a string :start 4 :end 2)))
 402  (assert (raises-error? (count #\a string :start 6 :end 9)))
 403  (assert (= (count-if #'alpha-char-p string :start 0 :end nil) 5))
 404  (assert (= (count-if #'alpha-char-p string :start 0 :end 5) 5))
 405  (assert (raises-error?
 406           (count-if #'alpha-char-p string :start 0 :end 6)))
 407  (assert (raises-error?
 408           (count-if #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 409  (assert (raises-error?
 410           (count-if #'alpha-char-p string :start 4 :end 2)))
 411  (assert (raises-error?
 412           (count-if #'alpha-char-p string :start 6 :end 9)))
 413  (assert (= (count-if-not #'alpha-char-p string :start 0 :end nil) 0))
 414  (assert (= (count-if-not #'alpha-char-p string :start 0 :end 5) 0))
 415  (assert (raises-error?
 416           (count-if-not #'alpha-char-p string :start 0 :end 6)))
 417  (assert (raises-error?
 418           (count-if-not #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 419  (assert (raises-error?
 420           (count-if-not #'alpha-char-p string :start 4 :end 2)))
 421  (assert (raises-error?
 422           (count-if-not #'alpha-char-p string :start 6 :end 9))))
 423
 424 ;;; Function FILL
 425 (sequence-bounding-indices-test
 426  (format t "~&/Function FILL~%")
 427  (assert (string= (fill string #\b :start 0 :end 5) "bbbbb"))
 428  (assert (string= (fill string #\c :start 0 :end nil) "ccccc"))
 429  (assert (raises-error? (fill string #\d :start 0 :end 6)))
 430  (assert (raises-error? (fill string #\d :start (opaque-identity -1) :end 5)))
 431  (assert (raises-error? (fill string #\d :start 4 :end 2)))
 432  (assert (raises-error? (fill string #\d :start 6 :end 9))))
 433
 434 ;;; Function FIND, FIND-IF, FIND-IF-NOT
 435 (sequence-bounding-indices-test
 436  (format t "~&/Function FIND, FIND-IF, FIND-IF-NOT~%")
 437  (assert (char= (find #\a string :start 0 :end nil) #\a))
 438  (assert (char= (find #\a string :start 0 :end 5) #\a))
 439  (assert (raises-error? (find #\a string :start 0 :end 6)))
 440  (assert (raises-error? (find #\a string :start (opaque-identity -1) :end 5)))
 441  (assert (raises-error? (find #\a string :start 4 :end 2)))
 442  (assert (raises-error? (find #\a string :start 6 :end 9)))
 443  (assert (char= (find-if #'alpha-char-p string :start 0 :end nil) #\a))
 444  (assert (char= (find-if #'alpha-char-p string :start 0 :end 5) #\a))
 445  (assert (raises-error?
 446           (find-if #'alpha-char-p string :start 0 :end 6)))
 447  (assert (raises-error?
 448           (find-if #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 449  (assert (raises-error?
 450           (find-if #'alpha-char-p string :start 4 :end 2)))
 451  (assert (raises-error?
 452           (find-if #'alpha-char-p string :start 6 :end 9)))
 453  (assert (eq (find-if-not #'alpha-char-p string :start 0 :end nil) nil))
 454  (assert (eq (find-if-not #'alpha-char-p string :start 0 :end 5) nil))
 455  (assert (raises-error?
 456           (find-if-not #'alpha-char-p string :start 0 :end 6)))
 457  (assert (raises-error?
 458           (find-if-not #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 459  (assert (raises-error?
 460           (find-if-not #'alpha-char-p string :start 4 :end 2)))
 461  (assert (raises-error?
 462           (find-if-not #'alpha-char-p string :start 6 :end 9))))
 463
 464 ;;; Function MISMATCH
 465 (sequence-bounding-indices-test
 466  (format t "~&/Function MISMATCH~%")
 467  (assert (null (mismatch string "aaaaa" :start1 0 :end1 nil)))
 468  (assert (= (mismatch "aaab" string :start2 0 :end2 4) 3))
 469  (assert (raises-error? (mismatch "aaaaaa" string :start2 0 :end2 6)))
 470  (assert (raises-error? (mismatch string "aaaaaa" :start1 (opaque-identity -1) :end1 5)))
 471  (assert (raises-error? (mismatch string "" :start1 4 :end1 2)))
 472  (assert (raises-error? (mismatch "aaaa" string :start2 6 :end2 9))))
 473
 474 ;;; Function PARSE-INTEGER
 475 (sequence-bounding-indices-test
 476  (format t "~&/Function PARSE-INTEGER~%")
 477  (setf (fill-pointer string) 10)
 478  (setf (subseq string 0 10) "1234567890")
 479  (setf (fill-pointer string) 5)
 480  (assert (= (parse-integer string :start 0 :end 5) 12345))
 481  (assert (= (parse-integer string :start 0 :end nil) 12345))
 482  (assert (raises-error? (parse-integer string :start 0 :end 6)))
 483  (assert (raises-error? (parse-integer string :start (opaque-identity -1) :end 5)))
 484  (assert (raises-error? (parse-integer string :start 4 :end 2)))
 485  (assert (raises-error? (parse-integer string :start 6 :end 9))))
 486
 487 ;;; Function PARSE-NAMESTRING
 488 (sequence-bounding-indices-test
 489  (format t "~&/Function PARSE-NAMESTRING~%")
 490  (setf (fill-pointer string) 10)
 491  (setf (subseq string 0 10) "/dev/ /tmp")
 492  (setf (fill-pointer string) 5)
 493  (assert (truename (parse-namestring string nil *default-pathname-defaults*
 494                                      :start 0 :end 5)))
 495  (assert (truename (parse-namestring string nil *default-pathname-defaults*
 496                                      :start 0 :end nil)))
 497  (assert (raises-error? (parse-namestring string nil
 498                                           *default-pathname-defaults*
 499                                           :start 0 :end 6)))
 500  (assert (raises-error? (parse-namestring string nil
 501                                           *default-pathname-defaults*
 502                                           :start (opaque-identity -1) :end 5)))
 503  (assert (raises-error? (parse-namestring string nil
 504                                           *default-pathname-defaults*
 505                                           :start 4 :end 2)))
 506  (assert (raises-error? (parse-namestring string nil
 507                                           *default-pathname-defaults*
 508                                           :start 6 :end 9))))
 509
 510 ;;; Function POSITION, POSITION-IF, POSITION-IF-NOT
 511 (sequence-bounding-indices-test
 512  (format t "~&/Function POSITION, POSITION-IF, POSITION-IF-NOT~%")
 513  (assert (= (position #\a string :start 0 :end nil) 0))
 514  (assert (= (position #\a string :start 0 :end 5) 0))
 515  (assert (raises-error? (position #\a string :start 0 :end 6)))
 516  (assert (raises-error? (position #\a string :start (opaque-identity -1) :end 5)))
 517  (assert (raises-error? (position #\a string :start 4 :end 2)))
 518  (assert (raises-error? (position #\a string :start 6 :end 9)))
 519  (assert (= (position-if #'alpha-char-p string :start 0 :end nil) 0))
 520  (assert (= (position-if #'alpha-char-p string :start 0 :end 5) 0))
 521  (assert (raises-error?
 522           (position-if #'alpha-char-p string :start 0 :end 6)))
 523  (assert (raises-error?
 524           (position-if #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 525  (assert (raises-error?
 526           (position-if #'alpha-char-p string :start 4 :end 2)))
 527  (assert (raises-error?
 528           (position-if #'alpha-char-p string :start 6 :end 9)))
 529  (assert (eq (position-if-not #'alpha-char-p string :start 0 :end nil) nil))
 530  (assert (eq (position-if-not #'alpha-char-p string :start 0 :end 5) nil))
 531  (assert (raises-error?
 532           (position-if-not #'alpha-char-p string :start 0 :end 6)))
 533  (assert (raises-error?
 534           (position-if-not #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 535  (assert (raises-error?
 536           (position-if-not #'alpha-char-p string :start 4 :end 2)))
 537  (assert (raises-error?
 538           (position-if-not #'alpha-char-p string :start 6 :end 9))))
 539
 540 ;;; Function READ-FROM-STRING
 541 (sequence-bounding-indices-test
 542  (format t "~&/Function READ-FROM-STRING~%")
 543  (setf (subseq string 0 5) "(a b)")
 544  (assert (equal (read-from-string string nil nil :start 0 :end 5) '(a b)))
 545  (assert (equal (read-from-string string nil nil :start 0 :end nil) '(a b)))
 546  (assert (raises-error? (read-from-string string nil nil :start 0 :end 6)))
 547  (assert (raises-error? (read-from-string string nil nil :start (opaque-identity -1) :end 5)))
 548  (assert (raises-error? (read-from-string string nil nil :start 4 :end 2)))
 549  (assert (raises-error? (read-from-string string nil nil :start 6 :end 9))))
 550
 551 ;;; Function REDUCE
 552 (sequence-bounding-indices-test
 553  (format t "~&/Function REDUCE~%")
 554  (setf (subseq string 0 5) "abcde")
 555  (assert (equal (reduce #'list* string :from-end t :start 0 :end nil)
 556                 '(#\a #\b #\c #\d . #\e)))
 557  (assert (equal (reduce #'list* string :from-end t :start 0 :end 5)
 558                 '(#\a #\b #\c #\d . #\e)))
 559  (assert (raises-error? (reduce #'list* string :start 0 :end 6)))
 560  (assert (raises-error? (reduce #'list* string :start (opaque-identity -1) :end 5)))
 561  (assert (raises-error? (reduce #'list* string :start 4 :end 2)))
 562  (assert (raises-error? (reduce #'list* string :start 6 :end 9))))
 563
 564 ;;; Function REMOVE, REMOVE-IF, REMOVE-IF-NOT, DELETE, DELETE-IF,
 565 ;;; DELETE-IF-NOT
 566 (sequence-bounding-indices-test
 567  (format t "~&/Function REMOVE, REMOVE-IF, REMOVE-IF-NOT, ...~%")
 568  (assert (equal (remove #\a string :start 0 :end nil) ""))
 569  (assert (equal (remove #\a string :start 0 :end 5) ""))
 570  (assert (raises-error? (remove #\a string :start 0 :end 6)))
 571  (assert (raises-error? (remove #\a string :start (opaque-identity -1) :end 5)))
 572  (assert (raises-error? (remove #\a string :start 4 :end 2)))
 573  (assert (raises-error? (remove #\a string :start 6 :end 9)))
 574  (assert (equal (remove-if #'alpha-char-p string :start 0 :end nil) ""))
 575  (assert (equal (remove-if #'alpha-char-p string :start 0 :end 5) ""))
 576  (assert (raises-error?
 577           (remove-if #'alpha-char-p string :start 0 :end 6)))
 578  (assert (raises-error?
 579           (remove-if #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 580  (assert (raises-error?
 581           (remove-if #'alpha-char-p string :start 4 :end 2)))
 582  (assert (raises-error?
 583           (remove-if #'alpha-char-p string :start 6 :end 9)))
 584  (assert (equal (remove-if-not #'alpha-char-p string :start 0 :end nil)
 585                 "aaaaa"))
 586  (assert (equal (remove-if-not #'alpha-char-p string :start 0 :end 5)
 587                 "aaaaa"))
 588  (assert (raises-error?
 589           (remove-if-not #'alpha-char-p string :start 0 :end 6)))
 590  (assert (raises-error?
 591           (remove-if-not #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 592  (assert (raises-error?
 593           (remove-if-not #'alpha-char-p string :start 4 :end 2)))
 594  (assert (raises-error?
 595           (remove-if-not #'alpha-char-p string :start 6 :end 9))))
 596 (sequence-bounding-indices-test
 597  (format t "~&/... DELETE, DELETE-IF, DELETE-IF-NOT")
 598  (assert (equal (delete #\a string :start 0 :end nil) ""))
 599  (reset)
 600  (assert (equal (delete #\a string :start 0 :end 5) ""))
 601  (reset)
 602  (assert (raises-error? (delete #\a string :start 0 :end 6)))
 603  (reset)
 604  (assert (raises-error? (delete #\a string :start (opaque-identity -1) :end 5)))
 605  (reset)
 606  (assert (raises-error? (delete #\a string :start 4 :end 2)))
 607  (reset)
 608  (assert (raises-error? (delete #\a string :start 6 :end 9)))
 609  (reset)
 610  (assert (equal (delete-if #'alpha-char-p string :start 0 :end nil) ""))
 611  (reset)
 612  (assert (equal (delete-if #'alpha-char-p string :start 0 :end 5) ""))
 613  (reset)
 614  (assert (raises-error?
 615           (delete-if #'alpha-char-p string :start 0 :end 6)))
 616  (reset)
 617  (assert (raises-error?
 618           (delete-if #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 619  (reset)
 620  (assert (raises-error?
 621           (delete-if #'alpha-char-p string :start 4 :end 2)))
 622  (reset)
 623  (assert (raises-error?
 624           (delete-if #'alpha-char-p string :start 6 :end 9)))
 625  (reset)
 626  (assert (equal (delete-if-not #'alpha-char-p string :start 0 :end nil)
 627                 "aaaaa"))
 628  (reset)
 629  (assert (equal (delete-if-not #'alpha-char-p string :start 0 :end 5)
 630                 "aaaaa"))
 631  (reset)
 632  (assert (raises-error?
 633           (delete-if-not #'alpha-char-p string :start 0 :end 6)))
 634  (reset)
 635  (assert (raises-error?
 636           (delete-if-not #'alpha-char-p string :start (opaque-identity -1) :end 5)))
 637  (reset)
 638  (assert (raises-error?
 639           (delete-if-not #'alpha-char-p string :start 4 :end 2)))
 640  (reset)
 641  (assert (raises-error?
 642           (delete-if-not #'alpha-char-p string :start 6 :end 9))))
 643
 644 ;;; Function REMOVE-DUPLICATES, DELETE-DUPLICATES
 645 (sequence-bounding-indices-test
 646  (format t "~&/Function REMOVE-DUPLICATES, DELETE-DUPLICATES~%")
 647  (assert (string= (remove-duplicates string :start 0 :end 5) "a"))
 648  (assert (string= (remove-duplicates string :start 0 :end nil) "a"))
 649  (assert (raises-error? (remove-duplicates string :start 0 :end 6)))
 650  (assert (raises-error? (remove-duplicates string :start (opaque-identity -1) :end 5)))
 651  (assert (raises-error? (remove-duplicates string :start 4 :end 2)))
 652  (assert (raises-error? (remove-duplicates string :start 6 :end 9)))
 653  (assert (string= (delete-duplicates string :start 0 :end 5) "a"))
 654  (reset)
 655  (assert (string= (delete-duplicates string :start 0 :end nil) "a"))
 656  (reset)
 657  (assert (raises-error? (delete-duplicates string :start 0 :end 6)))
 658  (reset)
 659  (assert (raises-error? (delete-duplicates string :start (opaque-identity -1) :end 5)))
 660  (reset)
 661  (assert (raises-error? (delete-duplicates string :start 4 :end 2)))
 662  (reset)
 663  (assert (raises-error? (delete-duplicates string :start 6 :end 9))))
 664
 665 ;;; Function REPLACE
 666 (sequence-bounding-indices-test
 667  (format t "~&/Function REPLACE~%")
 668  (assert (string= (replace string "bbbbb" :start1 0 :end1 5) "bbbbb"))
 669  (assert (string= (replace (copy-seq "ccccc")
 670                            string
 671                            :start2 0 :end2 nil) "bbbbb"))
 672  (assert (raises-error? (replace string "ccccc" :start1 0 :end1 6)))
 673  (assert (raises-error? (replace string "ccccc" :start2 (opaque-identity -1) :end2 5)))
 674  (assert (raises-error? (replace string "ccccc" :start1 4 :end1 2)))
 675  (assert (raises-error? (replace string "ccccc" :start1 6 :end1 9))))
 676
 677 ;;; Function SEARCH
 678 (sequence-bounding-indices-test
 679  (format t "~&/Function SEARCH~%")
 680  (assert (= (search "aa" string :start2 0 :end2 5) 0))
 681  (assert (null (search string "aa" :start1 0 :end2 nil)))
 682  (assert (raises-error? (search "aa" string :start2 0 :end2 6)))
 683  (assert (raises-error? (search "aa" string :start2 (opaque-identity -1) :end2 5)))
 684  (assert (raises-error? (search "aa" string :start2 4 :end2 2)))
 685  (assert (raises-error? (search "aa" string :start2 6 :end2 9))))
 686
 687 ;;; Function STRING-UPCASE, STRING-DOWNCASE, STRING-CAPITALIZE,
 688 ;;; NSTRING-UPCASE, NSTRING-DOWNCASE, NSTRING-CAPITALIZE
 689 (defmacro string-case-frob (fn)
 690   `(progn
 691     (assert (raises-error? (,fn string :start 0 :end 6)))
 692     (assert (raises-error? (,fn string :start (opaque-identity -1) :end 5)))
 693     (assert (raises-error? (,fn string :start 4 :end 2)))
 694     (assert (raises-error? (,fn string :start 6 :end 9)))))
 695
 696 (sequence-bounding-indices-test
 697  (format t "~&/Function STRING-UPCASE, STRING-DOWNCASE, STRING-CAPITALIZE, ...~%")
 698  (string-case-frob string-upcase)
 699  (string-case-frob string-downcase)
 700  (string-case-frob string-capitalize)
 701  (format t "~&/... NSTRING-UPCASE, NSTRING-DOWNCASE, NSTRING-CAPITALIZE~%")
 702  (string-case-frob nstring-upcase)
 703  (string-case-frob nstring-downcase)
 704  (string-case-frob nstring-capitalize))
 705
 706 ;;; Function STRING=, STRING/=, STRING<, STRING>, STRING<=, STRING>=,
 707 ;;; STRING-EQUAL, STRING-NOT-EQUAL, STRING-LESSP, STRING-GREATERP,
 708 ;;; STRING-NOT-GREATERP, STRING-NOT-LESSP
 709 (defmacro string-predicate-frob (fn)
 710   `(progn
 711     (,fn string "abcde" :start1 0 :end1 5)
 712     (,fn "fghij" string :start2 0 :end2 nil)
 713     (assert (raises-error? (,fn string "klmno"
 714                                 :start1 0 :end1 6)))
 715     (assert (raises-error? (,fn "pqrst" string
 716                                 :start2 (opaque-identity -1) :end2 5)))
 717     (assert (raises-error? (,fn "uvwxy" string
 718                                 :start1 4 :end1 2)))
 719     (assert (raises-error? (,fn string "z" :start2 6 :end2 9)))))
 720 (sequence-bounding-indices-test
 721  (format t "~&/Function STRING=, STRING/=, STRING<, STRING>, STRING<=, STRING>=, ...")
 722  (string-predicate-frob string=)
 723  (string-predicate-frob string/=)
 724  (string-predicate-frob string<)
 725  (string-predicate-frob string>)
 726  (string-predicate-frob string<=)
 727  (string-predicate-frob string>=))
 728 (sequence-bounding-indices-test
 729  (format t "~&/... STRING-EQUAL, STRING-NOT-EQUAL, STRING-LESSP, ...~%")
 730  (string-predicate-frob string-equal)
 731  (string-predicate-frob string-not-equal)
 732  (string-predicate-frob string-lessp))
 733 (sequence-bounding-indices-test
 734  (format t "~&/... STRING-GREATERP, STRING-NOT-GREATERP, STRING-NOT-LESSP~%")
 735  (string-predicate-frob string-greaterp)
 736  (string-predicate-frob string-not-greaterp)
 737  (string-predicate-frob string-not-lessp))
 738
 739 ;;; Function SUBSTITUTE, SUBSTITUTE-IF, SUBSTITUTE-IF-NOT,
 740 ;;; NSUBSTITUTE, NSUBSTITUTE-IF, NSUBSTITUTE-IF-NOT
 741 (sequence-bounding-indices-test
 742  (format t "~&/Function SUBSTITUTE, SUBSTITUTE-IF, SUBSTITUTE-IF-NOT, ...~%")
 743  (assert (string= (substitute #\b #\a string :start 0 :end 5) "bbbbb"))
 744  (assert (string= (substitute #\c #\a string :start 0 :end nil)
 745                   "ccccc"))
 746  (assert (raises-error? (substitute #\b #\a string :start 0 :end 6)))
 747  (assert (raises-error? (substitute #\b #\a string :start (opaque-identity -1) :end 5)))
 748  (assert (raises-error? (substitute #\b #\a string :start 4 :end 2)))
 749  (assert (raises-error? (substitute #\b #\a string :start 6 :end 9)))
 750  (assert (string= (substitute-if #\b #'alpha-char-p string
 751                                  :start 0 :end 5)
 752                   "bbbbb"))
 753  (assert (string= (substitute-if #\c #'alpha-char-p string
 754                                  :start 0 :end nil)
 755                   "ccccc"))
 756  (assert (raises-error? (substitute-if #\b #'alpha-char-p string
 757                                        :start 0 :end 6)))
 758  (assert (raises-error? (substitute-if #\b #'alpha-char-p string
 759                                        :start (opaque-identity -1) :end 5)))
 760  (assert (raises-error? (substitute-if #\b #'alpha-char-p string
 761                                        :start 4 :end 2)))
 762  (assert (raises-error? (substitute-if #\b #'alpha-char-p string
 763                                        :start 6 :end 9)))
 764  (assert (string= (substitute-if-not #\b #'alpha-char-p string
 765                                      :start 0 :end 5)
 766                   "aaaaa"))
 767  (assert (string= (substitute-if-not #\c #'alpha-char-p string
 768                                      :start 0 :end nil)
 769                   "aaaaa"))
 770  (assert (raises-error? (substitute-if-not #\b #'alpha-char-p string
 771                                            :start 0 :end 6)))
 772  (assert (raises-error? (substitute-if-not #\b #'alpha-char-p string
 773                                            :start (opaque-identity -1) :end 5)))
 774  (assert (raises-error? (substitute-if-not #\b #'alpha-char-p string
 775                                            :start 4 :end 2)))
 776  (assert (raises-error? (substitute-if-not #\b #'alpha-char-p string
 777                                            :start 6 :end 9))))
 778 (sequence-bounding-indices-test
 779  (format t "~&/... NSUBSTITUTE, NSUBSTITUTE-IF, NSUBSTITUTE-IF-NOT~%")
 780  (assert (string= (nsubstitute #\b #\a string :start 0 :end 5) "bbbbb"))
 781  (reset)
 782  (assert (string= (nsubstitute #\c #\a string :start 0 :end nil)
 783                   "ccccc"))
 784  (reset)
 785  (assert (raises-error? (nsubstitute #\b #\a string :start 0 :end 6)))
 786  (reset)
 787  (assert (raises-error? (nsubstitute #\b #\a string :start (opaque-identity -1) :end 5)))
 788  (reset)
 789  (assert (raises-error? (nsubstitute #\b #\a string :start 4 :end 2)))
 790  (reset)
 791  (assert (raises-error? (nsubstitute #\b #\a string :start 6 :end 9)))
 792  (reset)
 793  (assert (string= (nsubstitute-if #\b #'alpha-char-p string
 794                                   :start 0 :end 5)
 795                   "bbbbb"))
 796  (reset)
 797  (assert (string= (nsubstitute-if #\c #'alpha-char-p string
 798                                   :start 0 :end nil)
 799                   "ccccc"))
 800  (reset)
 801  (assert (raises-error? (nsubstitute-if #\b #'alpha-char-p string
 802                                         :start 0 :end 6)))
 803  (reset)
 804  (assert (raises-error? (nsubstitute-if #\b #'alpha-char-p string
 805                                         :start (opaque-identity -1) :end 5)))
 806  (reset)
 807  (assert (raises-error? (nsubstitute-if #\b #'alpha-char-p string
 808                                         :start 4 :end 2)))
 809  (reset)
 810  (assert (raises-error? (nsubstitute-if #\b #'alpha-char-p string
 811                                         :start 6 :end 9)))
 812  (reset)
 813  (assert (string= (nsubstitute-if-not #\b #'alpha-char-p string
 814                                       :start 0 :end 5)
 815                   "aaaaa"))
 816  (reset)
 817  (assert (string= (nsubstitute-if-not #\c #'alpha-char-p string
 818                                       :start 0 :end nil)
 819                   "aaaaa"))
 820  (reset)
 821  (assert (raises-error? (nsubstitute-if-not #\b #'alpha-char-p string
 822                                             :start 0 :end 6)))
 823  (reset)
 824  (assert (raises-error? (nsubstitute-if-not #\b #'alpha-char-p string
 825                                             :start (opaque-identity -1) :end 5)))
 826  (reset)
 827  (assert (raises-error? (nsubstitute-if-not #\b #'alpha-char-p string
 828                                             :start 4 :end 2)))
 829  (reset)
 830  (assert (raises-error? (nsubstitute-if-not #\b #'alpha-char-p string
 831                                             :start 6 :end 9))))
 832 ;;; Function WRITE-STRING, WRITE-LINE
 833 (sequence-bounding-indices-test
 834  (format t "~&/Function WRITE-STRING, WRITE-LINE~%")
 835  (write-string string *standard-output* :start 0 :end 5)
 836  (write-string string *standard-output* :start 0 :end nil)
 837  (assert (raises-error? (write-string string *standard-output*
 838                                       :start 0 :end 6)))
 839  (assert (raises-error? (write-string string *standard-output*
 840                                       :start (opaque-identity -1) :end 5)))
 841  (assert (raises-error? (write-string string *standard-output*
 842                                       :start 4 :end 2)))
 843  (assert (raises-error? (write-string string *standard-output*
 844                                       :start 6 :end 9)))
 845  (write-line string *standard-output* :start 0 :end 5)
 846  (write-line string *standard-output* :start 0 :end nil)
 847  (assert (raises-error? (write-line string *standard-output*
 848                                       :start 0 :end 6)))
 849  (assert (raises-error? (write-line string *standard-output*
 850                                       :start (opaque-identity -1) :end 5)))
 851  (assert (raises-error? (write-line string *standard-output*
 852                                       :start 4 :end 2)))
 853  (assert (raises-error? (write-line string *standard-output*
 854                                       :start 6 :end 9))))
 855
 856 ;;; Macro WITH-INPUT-FROM-STRING
 857 (sequence-bounding-indices-test
 858  (format t "~&/Macro WITH-INPUT-FROM-STRING~%")
 859  (with-input-from-string (s string :start 0 :end 5)
 860    (assert (char= (read-char s) #\a)))
 861  (with-input-from-string (s string :start 0 :end nil)
 862    (assert (char= (read-char s) #\a)))
 863  (assert (raises-error?
 864           (with-input-from-string (s string :start 0 :end 6)
 865             (read-char s))))
 866  (assert (raises-error?
 867           (with-input-from-string (s string :start (opaque-identity -1) :end 5)
 868             (read-char s))))
 869  (assert (raises-error?
 870           (with-input-from-string (s string :start 4 :end 2)
 871             (read-char s))))
 872  (assert (raises-error?
 873           (with-input-from-string (s string :start 6 :end 9)
 874             (read-char s)))))
 875 \f
 876 ;;; success
 877 (quit :unix-status 104)