racket/mats/hash.ms

;;; hash.ms
;;; Copyright 1984-2017 Cisco Systems, Inc.
;;; 
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;; 
;;; http://www.apache.org/licenses/LICENSE-2.0
;;; 
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.

(mat old-hash-table
  (error? (get-hash-table '((a . b)) 'a #f))
  (error? (put-hash-table! (list (cons 'a 'b)) 'a 'b))
  (error? (remove-hash-table! (list (cons 'a 'b)) 'a))
  (error? (hash-table-map '((a . b)) cons))
  (error? (hash-table-for-each '((a . b)) cons))
  (begin
    (define $h-ht (make-hash-table))
    (hash-table? $h-ht))
  (not (hash-table? 3))
  (not (hash-table? '$h-ht))
  (null? (hash-table-map $h-ht list))
  (eq? (let ([n 0])
         (hash-table-for-each $h-ht (lambda (x y) (set! n (+ n 1))))
         n)
       0)
  (equal?
    (begin
      (put-hash-table! $h-ht 'ham 'spam)
      (hash-table-map $h-ht list))
    '((ham spam)))
  (error? ; wrong number of args
    (hash-table-map $h-ht (lambda (x) x)))
  (error? ; wrong number of args
    (hash-table-for-each $h-ht (lambda (x) x)))
  ((lambda (x y) (or (equal? x y) (equal? x (reverse y))))
    (begin
      (put-hash-table! $h-ht 'cram 'sham)
      (hash-table-map $h-ht list))
    '((ham spam) (cram sham)))
  ((lambda (x y) (or (equal? x y) (equal? x (reverse y))))
    (begin
      (put-hash-table! $h-ht 'ham 'jam)
      (hash-table-map $h-ht list))
    '((ham jam) (cram sham)))
  (eq? (get-hash-table $h-ht 'ham #f) 'jam)
  (eq? (get-hash-table $h-ht 'cram #f) 'sham)
  (eq? (get-hash-table $h-ht 'sham #f) #f)
  (equal? (get-hash-table $h-ht 'jam "rats") "rats")
  (eq? (let ([n 0])
         (hash-table-for-each $h-ht (lambda (x y) (set! n (+ n 1))))
         n)
       2)
  ((lambda (x y) (or (equal? x y) (equal? x (reverse y))))
   (let ([keys '()] [vals '()])
     (hash-table-for-each $h-ht
       (lambda (k v)
         (set! keys (cons k keys))
         (set! vals (cons v vals))))
     (map cons vals keys))
   '((jam . ham) (sham . cram)))
  (eq? (collect (collect-maximum-generation)) (void))
  ((lambda (x y) (or (equal? x y) (equal? x (reverse y))))
   (let ([keys '()] [vals '()])
     (hash-table-for-each $h-ht
       (lambda (k v)
         (set! keys (cons k keys))
         (set! vals (cons v vals))))
     (map cons vals keys))
   '((jam . ham) (sham . cram)))
  (eq? (begin
         (remove-hash-table! $h-ht 'ham)
         (get-hash-table $h-ht 'ham 'gone!))
       'gone!)
  (equal?
    (hash-table-map $h-ht list)
    '((cram sham)))
  (eq? (collect (collect-maximum-generation)) (void))
  (equal?
    (hash-table-map $h-ht list)
    '((cram sham)))
  (eq? (begin
         (remove-hash-table! $h-ht 'ham)
         (get-hash-table $h-ht 'ham 'gone!))
       'gone!)
  (equal?
    (hash-table-map $h-ht list)
    '((cram sham)))
  (eq? (begin
         (remove-hash-table! $h-ht 'sham)
         (get-hash-table $h-ht 'ham 'never-there!))
       'never-there!)
  (equal?
    (hash-table-map $h-ht list)
    '((cram sham)))
  (eq? (begin
         (remove-hash-table! $h-ht 'cram)
         (get-hash-table $h-ht 'cram 'gone-too!))
       'gone-too!)
  (null? (hash-table-map $h-ht list))

 ; fasling out eq hash tables
  (equal?
    (let ([x (cons 'y '!)])
      (define ht (make-hash-table))
      (put-hash-table! ht x 'because)
      (put-hash-table! ht 'foo "foo")
      (let ([p (open-file-output-port "testfile.ss" (file-options replace))])
        (fasl-write (list x ht) p)
        (close-port p))
      (let-values ([(x2 ht2)
                    (apply values
                      (call-with-port
                        (open-file-input-port "testfile.ss")
                        fasl-read))])
        (list
          (get-hash-table ht2 x2 #f)
          (get-hash-table ht2 'foo #f))))
    '(because "foo"))

 ; weak hash table tests
  (begin
    (define $h-ht (make-hash-table #t))
    (hash-table? $h-ht))
  (null?
    (begin
      (put-hash-table! $h-ht (string #\a) 'yea!)
      (collect (collect-maximum-generation))
      (hash-table-map $h-ht cons)))
  (eq? (let ([n 0])
         (hash-table-for-each $h-ht (lambda (x y) (set! n (+ n 1))))
         n)
       0)
  (let ([s (string #\a)])
    (put-hash-table! $h-ht s 666)
    (equal? (get-hash-table $h-ht s #f) 666))
  (null?
    (begin
      (collect (collect-maximum-generation))
      (hash-table-map $h-ht cons)))

 ; make sure that nonweak hash tables are nonweak (explicit #f arg)
  (begin
    (define $h-ht (make-hash-table #f))
    (hash-table? $h-ht))
  (equal?
    (begin
      (put-hash-table! $h-ht (string #\a) "bc")
      (collect (collect-maximum-generation))
      (hash-table-map $h-ht string-append))
    '("abc"))

 ; make sure that nonweak hash tables are nonweak (implicit #f arg)
  (begin
    (define $h-ht (make-hash-table))
    (hash-table? $h-ht))
  (equal?
    (begin
      (put-hash-table! $h-ht (string #\a) "bc")
      (collect (collect-maximum-generation))
      (hash-table-map $h-ht string-append))
    '("abc"))

 ; stress tests
  (let () ; nonweak
    (define pick
      (lambda (ls)
        (list-ref ls (random (length ls)))))
    (define ht (make-hash-table))
    (let* ([ls (remq '|| (oblist))] [n 50000])
      (let f ([i 0] [keep '()] [drop '()])
        (if (= i n)
            (and (= (length (hash-table-map ht (lambda (x y) x)))
                    (- n (length drop)))
                 (andmap (lambda (k)
                           (string=?
                             (symbol->string (get-hash-table ht k #f))
                             (cond
                               [(string? k) k]
                               [(pair? k) (car k)]
                               [(vector? k) (vector-ref k 0)])))
                         keep)
                 (andmap (lambda (k) (eq? (get-hash-table ht k 'no) 'no))
                         drop))
            (let* ([x (pick ls)] [s (string-copy (symbol->string x))])
              (let ([k (case (pick '(string pair vector))
                         [(string) s]
                         [(pair) (list s)]
                         [(vector) (vector s)])])
                (put-hash-table! ht k x)
                (let ([keep (if (= (modulo i 5) 0) (cons k keep) keep)])
                  (if (= (modulo i 17) 5)
                      (let ([k (pick keep)])
                        (remove-hash-table! ht k)
                        (let ([drop (cons k drop)])
                          (when (= (random 5) 3)
                            (remove-hash-table! ht (pick drop)))
                          (f (+ i 1) (remq k keep) drop)))
                      (f (+ i 1) keep drop)))))))))

  (let () ; weak
    (define pick
      (lambda (ls)
        (list-ref ls (random (length ls)))))
    (define ht (make-hash-table #t))
    (let* ([ls (remq '|| (oblist))] [n 50000])
      (let f ([i 0] [keep '()] [drop '()])
        (if (= i n)
            (and (<= (length (hash-table-map ht (lambda (x y) x)))
                     (- n (length drop)))
                 (begin
                   (collect (collect-maximum-generation))
                   (= (length (hash-table-map ht (lambda (x y) x)))
                      (length keep)))
                 (andmap (lambda (k)
                           (string=?
                             (symbol->string (get-hash-table ht k #f))
                             (cond
                               [(string? k) k]
                               [(pair? k) (car k)]
                               [(vector? k) (vector-ref k 0)])))
                         keep)
                 (andmap (lambda (k) (eq? (get-hash-table ht k 'no) 'no))
                         drop))
            (let* ([x (pick ls)] [s (string-copy (symbol->string x))])
              (let ([k (case (pick '(string pair vector))
                         [(string) s]
                         [(pair) (list s)]
                         [(vector) (vector s)])])
                (put-hash-table! ht k x)
                (let ([keep (if (= (modulo i 5) 0) (cons k keep) keep)])
                  (if (= (modulo i 17) 5)
                      (let ([k (pick keep)])
                        (remove-hash-table! ht k)
                        (let ([drop (cons k drop)])
                          (when (= (random 5) 3)
                            (remove-hash-table! ht (pick drop)))
                          (f (+ i 1) (remq k keep) drop)))
                      (f (+ i 1) keep drop)))))))))
)

(mat tlc
  (critical-section
    (let ()
      (define ht (make-eq-hashtable))
      (define keyval '(a . b))
      (define next 0)
      (define tlc (#%$make-tlc ht keyval next))
      (define tlc2 (#%$make-tlc ht keyval next))
      (and
        (#%$tlc? tlc)
        (not (#%$tlc? keyval))
        (eq? (#%$tlc-ht tlc) ht)
        (eq? (#%$tlc-keyval tlc) keyval)
        (eqv? (#%$tlc-next tlc) next)
        (begin
          (#%$set-tlc-next! tlc tlc2)
          (eq? (#%$tlc-next tlc) tlc2)))))
)

(define $vector-andmap
  (lambda (p . v*)
    (apply andmap p (map vector->list v*))))

(define $vector-append
  (lambda v*
    (list->vector (apply append (map vector->list v*)))))

(define $vector-member?
  (lambda (x v)
    (let ([n (vector-length v)])
      (let f ([i 0])
        (and (not (fx= i n))
          (or (equal? (vector-ref v i) x)
              (f (fx+ i 1))))))))

(define same-elements?
  (lambda (v1 v2)
    (let ([n (vector-length v1)])
      (define (each-in? v1 v2)
        (let f ([i 0])
          (or (fx= i n)
              (and ($vector-member? (vector-ref v1 i) v2)
                   (f (fx+ i 1))))))
      (and (fx= (vector-length v2) n)
           (each-in? v1 v2)
           (each-in? v2 v1)))))

(define $equal-entries?
  (lambda (keys1 vals1 keys2 vals2)
    (and
      (same-elements? keys1 keys2)
      (same-elements? vals1 vals2))))

(define-syntax equal-entries?
  (syntax-rules ()
    [(_ e1 e2 e3)
     (let-values ([(keys1 vals1) e1])
       ($equal-entries? keys1 vals1 e2 e3))]))

(mat hashtable-arguments
 ; make-eq-hashtable
  (error? ; wrong argument count
    (make-eq-hashtable 3 #t))
  (error? ; invalid size
    (make-eq-hashtable -1))
  (error? ; invalid size
    (make-eq-hashtable #t))
  (error? ; invalid size
    (make-eq-hashtable #f))
 ; make-hashtable
  (error? ; wrong argument count
    (make-hashtable))
  (error? ; wrong argument count
    (make-hashtable equal-hash))
  (error? ; wrong argument count
    (make-hashtable equal-hash equal? 45 53))
  (error? ; not a procedure
    (make-hashtable 'a equal? 45))
  (error? ; not a procedure
    (make-hashtable equal-hash 'a 45))
  (error? ; invalid size
    (make-hashtable equal-hash equal? 'a))
  (error? ; invalid size
    (make-hashtable equal-hash equal? -45))
  (error? ; invalid size
    (make-hashtable equal-hash equal? 45.0))
 ; make-eqv-hashtable
  (error? ; wrong argument count
    (make-eqv-hashtable 3 #t))
  (error? ; invalid size
    (make-eqv-hashtable -1))
  (error? ; invalid size
    (make-eqv-hashtable #t))
  (error? ; invalid size
    (make-eqv-hashtable #f))
  (begin
    (define $ht (make-eq-hashtable))
    (define $imht (hashtable-copy $ht))
    (define $ht2 (make-eq-hashtable 50))
    (and (hashtable? $ht)
         (eq-hashtable? $ht)
         (hashtable-mutable? $ht)
         (not (hashtable-weak? $ht))
         (not (eq-hashtable-weak? $ht))
         (hashtable? $imht)
         (eq-hashtable? $imht)
         (not (hashtable-mutable? $imht))
         (not (hashtable-weak? $imht))
         (not (eq-hashtable-weak? $imht))
         (hashtable? $ht2)
         (eq-hashtable? $ht2)
         (hashtable-mutable? $ht2)
         (not (hashtable-weak? $ht2))
         (not (eq-hashtable-weak? $ht2))))
  (not (hashtable? 3))
  (not (hashtable? (make-vector 3)))
  (not (eq-hashtable? 3))
  (not (eq-hashtable? (make-vector 3)))
 ; hashtable?
  (error? ; wrong argument count
    (hashtable?))
  (error? ; wrong argument count
    (hashtable? $ht 3))
  (error? ; wrong argument count
    (eq-hashtable?))
  (error? ; wrong argument count
    (eq-hashtable? $ht 3))
 ; hashtable-mutable?
  (error? ; not a hashtable
    (hashtable-mutable? (make-vector 3)))
  (error? ; wrong argument count
    (hashtable-mutable?))
  (error? ; wrong argument count
    (hashtable-mutable? $ht 3))
 ; hashtable-size
  (error? ; wrong argument count
    (hashtable-size))
  (error? ; wrong argument count
    (hashtable-size $ht 3))
  (error? ; not a hashtable
    (hashtable-size 'hello))
 ; hashtable-ref
  (error? ; wrong argument count
    (hashtable-ref))
  (error? ; wrong argument count
    (hashtable-ref $ht))
  (error? ; wrong argument count
    (hashtable-ref $ht 'a))
  (error? ; wrong argument count
    (hashtable-ref $ht 'a 'b 'c))
  (error? ; not a hashtable
    (hashtable-ref '(hash . table) 'a 'b))
 ; hashtable-contains?
  (error? ; wrong argument count
    (hashtable-contains?))
  (error? ; wrong argument count
    (hashtable-contains? $ht))
  (error? ; wrong argument count
    (hashtable-contains? $ht 'a 'b))
  (error? ; not a hashtable
    (hashtable-contains? '(hash . table) 'a))
 ; hashtable-set!
  (error? ; wrong argument count
    (hashtable-set!))
  (error? ; wrong argument count
    (hashtable-set! $ht))
  (error? ; wrong argument count
    (hashtable-set! $ht 'a))
  (error? ; wrong argument count
    (hashtable-set! $ht 'a 'b 'c))
  (error? ; not a hashtable
    (hashtable-set! '(hash . table) 'a 'b))
  (error? ; hashtable not mutable
    (hashtable-set! $imht 'a 'b))
 ; hashtable-update!
  (error? ; wrong argument count
    (hashtable-update!))
  (error? ; wrong argument count
    (hashtable-update! $ht))
  (error? ; wrong argument count
    (hashtable-update! $ht 'a values))
  (error? ; wrong argument count
    (hashtable-update! $ht 'a values 'c 'd))
  (error? ; not a hashtable
    (hashtable-update! '(hash . table) 'a values 'b))
  (error? ; hashtable not mutable
    (hashtable-update! $imht 'a values 'b))
  (error? ; not a procedure
    (hashtable-update! $ht 'a "not a procedure" 'b))
 ; hashtable-cell
  (error? ; wrong argument count
    (hashtable-cell))
  (error? ; wrong argument count
    (hashtable-cell $ht))
  (error? ; wrong argument count
    (hashtable-cell $ht 'a))
  (error? ; wrong argument count
    (hashtable-cell $ht 'a 'b 'c))
  (error? ; not a hashtable
    (hashtable-cell '(hash . table) 'a 'b))
 ; hashtable-delete!
  (error? ; wrong argument count
    (hashtable-delete!))
  (error? ; wrong argument count
    (hashtable-delete! $ht))
  (error? ; wrong argument count
    (hashtable-delete! $ht 'a 'b))
  (error? ; not a hashtable
    (hashtable-delete! '(hash . table) 'a))
  (error? ; hashtable not mutable
    (hashtable-delete! $imht 'a))
 ; hashtable-copy
  (error? ; wrong argument count
    (hashtable-copy))
  (error? ; wrong argument count
    (hashtable-copy $ht #t 17))
  (error? ; not a hashtable
    (hashtable-copy '(hash . table) #t))
 ; hashtable-clear!
  (error? ; wrong argument count
    (hashtable-clear!))
  (error? ; wrong argument count
    (hashtable-clear! $ht 17 'foo))
  (error? ; not a hashtable
    (hashtable-clear! '(hash . table)))
  (error? ; not a hashtable
    (hashtable-clear! '(hash . table) 17))
  (error? ; hashtable not mutable
    (hashtable-clear! $imht))
  (error? ; hashtable not mutable
    (hashtable-clear! $imht 32))
  (error? ; invalid size
    (hashtable-clear! $ht #t))
 ; hashtable-keys
  (error? ; wrong argument count
    (hashtable-keys))
  (error? ; wrong argument count
    (hashtable-keys $ht 72))
  (error? ; not a hashtable
    (hashtable-keys '(hash . table)))
 ; hashtable-values
  (error? ; wrong argument count
    (hashtable-values))
  (error? ; wrong argument count
    (hashtable-values $ht 72))
  (error? ; not a hashtable
    (hashtable-values '(hash . table)))
 ; hashtable-entries
  (error? ; wrong argument count
    (hashtable-entries))
  (error? ; wrong argument count
    (hashtable-entries $ht 72))
  (error? ; not a hashtable
    (hashtable-entries '(hash . table)))
 ; hashtable-hash-function
  (error? ; wrong argument count
    (hashtable-hash-function))
  (error? ; wrong argument count
    (hashtable-hash-function $ht $ht))
  (error? ; not a hsshtable
    (hashtable-hash-function '(hash . table)))
 ; hashtable-equivalence-function
  (error? ; wrong argument count
    (hashtable-equivalence-function))
  (error? ; wrong argument count
    (hashtable-equivalence-function $ht $ht))
  (error? ; not a hsshtable
    (hashtable-equivalence-function '(hash . table)))
 ; hashtable-weak?
  (error? ; wrong argument count
    (hashtable-weak?))
  (error? ; wrong argument count
    (hashtable-weak? $ht 3))
  (error? ; not a hashtable
    (hashtable-weak? '(hash . table)))
)

(mat hash-return-value
  ; hashtable-ref
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) "oops") equal?)])
      (hashtable-ref ht 'any #f)))
  #;(error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) -7) equal?)])
      (hashtable-ref ht 'any #f)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 3.5) equal?)])
      (hashtable-ref ht 'any #f)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 1+2i) equal?)])
      (hashtable-ref ht 'any #f)))
  ; hashtable-contains?
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) "oops") equal?)])
      (hashtable-contains? ht 'any)))
  #;(error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) -7) equal?)])
      (hashtable-contains? ht 'any)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 3.5) equal?)])
      (hashtable-contains? ht 'any)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 1+2i) equal?)])
      (hashtable-contains? ht 'any)))
  ; hashtable-set!
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) "oops") equal?)])
      (hashtable-set! ht 'any 'spam)))
  #;(error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) -7) equal?)])
      (hashtable-set! ht 'any 'spam)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 3.5) equal?)])
      (hashtable-set! ht 'any 'spam)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 1+2i) equal?)])
      (hashtable-set! ht 'any 'spam)))
  ; hashtable-update!
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) "oops") equal?)])
      (hashtable-update! ht 'any values 'spam)))
  #;(error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) -7) equal?)])
      (hashtable-update! ht 'any values 'spam)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 3.5) equal?)])
      (hashtable-update! ht 'any values 'spam)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 1+2i) equal?)])
      (hashtable-update! ht 'any values 'spam)))
  ; hashtable-cell
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) "oops") equal?)])
      (hashtable-cell ht 'any 0)))
  #;(error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) -7) equal?)])
      (hashtable-cell ht 'any 0)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 3.5) equal?)])
      (hashtable-cell ht 'any 0)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 1+2i) equal?)])
      (hashtable-cell ht 'any 0)))
  ; hashtable-delete!
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) "oops") equal?)])
      (hashtable-delete! ht 'any)))
  #;(error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) -7) equal?)])
      (hashtable-delete! ht 'any)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 3.5) equal?)])
      (hashtable-delete! ht 'any)))
  (error? ; invalid hash-function return value
    (let ([ht (make-hashtable (lambda (x) 1+2i) equal?)])
      (hashtable-delete! ht 'any)))
)

(mat eq-hashtable-arguments
 ; make-weak-eq-hashtable
  (error? ; wrong argument count
    (make-weak-eq-hashtable 3 #t))
  (error? ; invalid size
    (make-weak-eq-hashtable -1))
  (error? ; invalid size
    (make-weak-eq-hashtable #t))
  (error? ; invalid size
    (make-weak-eq-hashtable #f))
  (begin
    (define $wht (make-weak-eq-hashtable 50))
    (define $imht (hashtable-copy $wht))
    (define $wht2 (make-weak-eq-hashtable))
    (and (hashtable? $wht)
         (eq-hashtable? $wht)
         (hashtable-weak? $wht)
         (eq-hashtable-weak? $wht)
         (hashtable-mutable? $wht)
         (hashtable? $imht)
         (eq-hashtable? $imht)
         (hashtable-weak? $imht)
         (eq-hashtable-weak? $imht)
         (not (hashtable-mutable? $imht))
         (hashtable? $wht2)
         (eq-hashtable? $wht2)
         (hashtable-weak? $wht2)
         (eq-hashtable-weak? $wht2)
         (hashtable-mutable? $wht2)))
 ; eq-hashtable-ref
  (error? ; wrong argument count
    (eq-hashtable-ref))
  (error? ; wrong argument count
    (eq-hashtable-ref $wht))
  (error? ; wrong argument count
    (eq-hashtable-ref $wht 'a))
  (error? ; wrong argument count
    (eq-hashtable-ref $wht 'a 'b 'c))
  (error? ; not a hashtable
    (eq-hashtable-ref '(hash . table) 'a 'b))
 ; eq-hashtable-contains?
  (error? ; wrong argument count
    (eq-hashtable-contains?))
  (error? ; wrong argument count
    (eq-hashtable-contains? $wht))
  (error? ; wrong argument count
    (eq-hashtable-contains? $wht 'a 'b))
  (error? ; not a hashtable
    (eq-hashtable-contains? '(hash . table) 'a))
 ; eq-hashtable-set!
  (error? ; wrong argument count
    (eq-hashtable-set!))
  (error? ; wrong argument count
    (eq-hashtable-set! $wht))
  (error? ; wrong argument count
    (eq-hashtable-set! $wht 'a))
  (error? ; wrong argument count
    (eq-hashtable-set! $wht 'a 'b 'c))
  (error? ; not a hashtable
    (eq-hashtable-set! '(hash . table) 'a 'b))
  (error? ; hashtable not mutable
    (eq-hashtable-set! $imht 'a 'b))
 ; eq-hashtable-update!
  (error? ; wrong argument count
    (eq-hashtable-update!))
  (error? ; wrong argument count
    (eq-hashtable-update! $wht))
  (error? ; wrong argument count
    (eq-hashtable-update! $wht 'a values))
  (error? ; wrong argument count
    (eq-hashtable-update! $wht 'a values 'c 'd))
  (error? ; not a hashtable
    (eq-hashtable-update! '(hash . table) 'a values 'b))
  (error? ; hashtable not mutable
    (eq-hashtable-update! $imht 'a values 'b))
  (error? ; not a procedure
    (eq-hashtable-update! $wht 'a "not a procedure" 'b))
 ; eq-hashtable-delete!
  (error? ; wrong argument count
    (eq-hashtable-delete!))
  (error? ; wrong argument count
    (eq-hashtable-delete! $wht))
  (error? ; wrong argument count
    (eq-hashtable-delete! $wht 'a 'b))
  (error? ; not a hashtable
    (eq-hashtable-delete! '(hash . table) 'a))
  (error? ; hashtable not mutable
    (eq-hashtable-delete! $imht 'a))
 ; eq-hashtable-cell
  (error? ; wrong argument count
    (eq-hashtable-cell))
  (error? ; wrong argument count
    (eq-hashtable-cell $wht))
  (error? ; wrong argument count
    (eq-hashtable-cell $wht 'a))
  (error? ; wrong argument count
    (eq-hashtable-cell $wht 'a 'b 'c))
  (error? ; not a hashtable
    (eq-hashtable-cell '(hash . table) 'a 'b))
 ; eq-hashtable-weak?
  (error? ; wrong argument count
    (eq-hashtable-weak?))
  (error? ; wrong argument count
    (eq-hashtable-weak? $ht 3))
  (error? ; not a hashtable
    (eq-hashtable-weak? '(hash . table)))
)

(mat symbol-hashtable-arguments
  (begin
    (define $symht (make-hashtable symbol-hash eq? 50))
    (define $imsymht (hashtable-copy $symht))
    #t)
 ; symbol-hashtable-ref
  (error? ; wrong argument count
    (symbol-hashtable-ref))
  (error? ; wrong argument count
    (symbol-hashtable-ref $symht))
  (error? ; wrong argument count
    (symbol-hashtable-ref $symht 'a))
  (error? ; wrong argument count
    (symbol-hashtable-ref $symht 'a 'b 'c))
  (error? ; not a hashtable
    (symbol-hashtable-ref '(hash . table) 'a 'b))
  (error? ; not a symbol hashtable
    (symbol-hashtable-ref $ht 'a 'b))
  (error? ; not a symbol
    (symbol-hashtable-ref $symht '(a) 'b))
  (error? ; not a symbol
    (hashtable-ref $symht '(a) 'b))
 ; symbol-hashtable-contains?
  (error? ; wrong argument count
    (symbol-hashtable-contains?))
  (error? ; wrong argument count
    (symbol-hashtable-contains? $symht))
  (error? ; wrong argument count
    (symbol-hashtable-contains? $symht 'a 'b))
  (error? ; not a hashtable
    (symbol-hashtable-contains? '(hash . table) 'a))
  (error? ; not a symbol hashtable
    (symbol-hashtable-contains? $ht 'a))
  (error? ; not a symbol
    (symbol-hashtable-contains? $symht '(a)))
  (error? ; not a symbol
    (hashtable-contains? $symht '(a)))
 ; symbol-hashtable-set!
  (error? ; wrong argument count
    (symbol-hashtable-set!))
  (error? ; wrong argument count
    (symbol-hashtable-set! $symht))
  (error? ; wrong argument count
    (symbol-hashtable-set! $symht 'a))
  (error? ; wrong argument count
    (symbol-hashtable-set! $symht 'a 'b 'c))
  (error? ; not a hashtable
    (symbol-hashtable-set! '(hash . table) 'a 'b))
  (error? ; not a symbol hashtable
    (symbol-hashtable-set! $ht 'a 'b))
  (error? ; not a symbol
    (symbol-hashtable-set! $symht '(a) 'b))
  (error? ; not a symbol
    (hashtable-set! $symht '(a) 'b))
  (error? ; hashtable not mutable
    (symbol-hashtable-set! $imsymht 'a 'b))
 ; symbol-hashtable-update!
  (error? ; wrong argument count
    (symbol-hashtable-update!))
  (error? ; wrong argument count
    (symbol-hashtable-update! $symht))
  (error? ; wrong argument count
    (symbol-hashtable-update! $symht 'a values))
  (error? ; wrong argument count
    (symbol-hashtable-update! $symht 'a values 'c 'd))
  (error? ; not a hashtable
    (symbol-hashtable-update! '(hash . table) 'a values 'b))
  (error? ; not a symbol hashtable
    (symbol-hashtable-update! $ht 'a values 'b))
  (error? ; not a symbol
    (symbol-hashtable-update! $symht '(a) values 'b))
  (error? ; not a symbol
    (hashtable-update! $symht '(a) values 'b))
  (error? ; hashtable not mutable
    (symbol-hashtable-update! $imsymht 'a values 'b))
  (error? ; not a procedure
    (symbol-hashtable-update! $symht 'a "not a procedure" 'b))
 ; symbol-hashtable-delete!
  (error? ; wrong argument count
    (symbol-hashtable-delete!))
  (error? ; wrong argument count
    (symbol-hashtable-delete! $symht))
  (error? ; wrong argument count
    (symbol-hashtable-delete! $symht 'a 'b))
  (error? ; not a hashtable
    (symbol-hashtable-delete! '(hash . table) 'a))
  (error? ; not a symbol hashtable
    (symbol-hashtable-delete! $ht 'a))
  (error? ; not a symbol
    (symbol-hashtable-delete! $symht '(a)))
  (error? ; not a symbol
    (hashtable-delete! $symht '(a)))
  (error? ; hashtable not mutable
    (symbol-hashtable-delete! $imsymht 'a))
 ; symbol-hashtable-cell
  (error? ; wrong argument count
    (symbol-hashtable-cell))
  (error? ; wrong argument count
    (symbol-hashtable-cell $symht))
  (error? ; wrong argument count
    (symbol-hashtable-cell $symht 'a))
  (error? ; wrong argument count
    (symbol-hashtable-cell $symht 'a 'b 'c))
  (error? ; not a hashtable
    (symbol-hashtable-cell '(hash . table) 'a 'b))
  (error? ; not a symbol hashtable
    (symbol-hashtable-cell $ht 'a 'b))
  (error? ; not a symbol
    (symbol-hashtable-cell $symht '(a) 'b))
  (error? ; not a symbol
    (hashtable-cell $symht '(a) 'b))
)

(mat eqv-hashtable-arguments
 ; make-weak-eqv-hashtable
  (error? ; wrong argument count
    (make-weak-eqv-hashtable 3 #t))
  (error? ; invalid size
    (make-weak-eqv-hashtable -1))
  (error? ; invalid size
    (make-weak-eqv-hashtable #t))
  (error? ; invalid size
    (make-weak-eqv-hashtable #f))
)

(mat nonweak-eq-hashtable
  (begin
    (define h (make-eq-hashtable 32))
    (and (hashtable? h)
         (eq-hashtable? h)
         (hashtable-mutable? h)
         (not (eq-hashtable-weak? h))
         (not (hashtable-weak? h))))
  (eq? (hashtable-hash-function h) #f)
  (eq? (hashtable-equivalence-function h) eq?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (hashtable-set! h 'a 'aval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 'b)
       (hashtable-contains? h 'c))
    '(#t #f #f))
  (eqv? (hashtable-set! h 'b 'bval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 'b)
       (hashtable-contains? h 'c))
    '(#t #t #f))
  (eqv? (hashtable-set! h 'c 'cval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 'b)
       (hashtable-contains? h 'c))
    '(#t #t #t))
  (equal? (hashtable-size h) 3)
  (same-elements? (hashtable-keys h) '#(a b c))
  (same-elements? (hashtable-values h) '#(bval cval aval))
  (equal-entries? (hashtable-entries h) '#(b c a) '#(bval cval aval))
  #;(same-elements? (list->vector (hashtable-map h cons)) '#((a . aval) (b . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each h (lambda (key val) (vector-set! v i (cons key val)) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (b . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each-cell h (lambda (a) (vector-set! v i a) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (b . bval) (c . cval)))
  (equal? (hashtable-ref h 'a 1) 'aval)
  (equal? (hashtable-ref h 'b #f) 'bval)
  (equal? (hashtable-ref h 'c 'nope) 'cval)
  (eqv? (hashtable-delete! h 'b) (void))
  (equal? (hashtable-size h) 2)
  (same-elements? (hashtable-keys h) '#(a c))
  (same-elements? (hashtable-values h) '#(aval cval))
  (equal-entries? (hashtable-entries h) '#(a c) '#(aval cval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (eq-hashtable? h2)
         (hashtable-mutable? h2)
         (not (hashtable-weak? h2))
         (not (eq-hashtable-weak? h2))))
  (eq? (hashtable-hash-function h2) #f)
  (eq? (hashtable-equivalence-function h2) eq?)
  (equal? (hashtable-size h2) 2)
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (hashtable-ref h 'a 1)
      (hashtable-ref h 'b #f)
      (hashtable-ref h 'c 'nope))
   '(0 1 #f nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (hashtable-ref h2 'a 1)
      (hashtable-ref h2 'b #f)
      (hashtable-ref h2 'c 'nope))
    '(2 aval #f cval))
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv?
    (hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h 'q #f) 18)
  (eqv?
    (hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h 'q #f) 19)
  (equal? (hashtable-size h) 1)
 ; test hashtable-copy when some keys may have moved
  (let ([t (parameterize ([collect-request-handler void])
             (let ([h4a (make-eq-hashtable 32)]
                   [k* (map list (make-list 100))])
               (for-each (lambda (x) (hashtable-set! h4a x x)) k*)
               (collect)
              ; create copy after collection but before otherwise touching h4a
               (let ([h4b (hashtable-copy h4a #t)])
                 (andmap
                   (lambda (k) (eq? (hashtable-ref h4b k #f) k))
                   k*))))])
    (collect)
    t)

 ; test for proper shrinkage
  (eqv?
    (let ([ht (make-eq-hashtable 32)])
      (for-each
        (lambda (k*) (for-each (lambda (k) (hashtable-delete! ht k)) k*))
        (let ([k** (map (lambda (x) (map list (make-list 1000)))
                        (make-list 100))])
          (for-each
            (lambda (k*) (map (lambda (k) (hashtable-set! ht k 75)) k*))
            k**)
          k**))
      (#%$hashtable-veclen ht))
    32)
)

(mat weak-eq-hashtable
  (begin
    (define ka (list 'a))
    (define kb (list 'b))
    (define kc (list 'c))
    (define kq (list 'q))
    (define ky (list 'y))
    (define kz (list 'z))
    #t)
  (begin
    (define h (make-weak-eq-hashtable 32))
    (and (hashtable? h)
         (eq-hashtable? h)
         (hashtable-mutable? h)
         (hashtable-weak? h)
         (eq-hashtable-weak? h)))
  (eq? (hashtable-hash-function h) #f)
  (eq? (hashtable-equivalence-function h) eq?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (hashtable-set! h ka 'aval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc))
    '(#t #f #f))
  (eqv? (hashtable-set! h kb 'bval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc))
    '(#t #t #f))
  (eqv? (hashtable-set! h kc 'cval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc))
    '(#t #t #t))
  (equal? (hashtable-size h) 3)
  (same-elements? (hashtable-keys h) '#((a) (b) (c)))
  (same-elements? (hashtable-values h) '#(bval cval aval))
  (equal-entries? (hashtable-entries h) '#((a) (b) (c)) '#(aval bval cval))
  #;(same-elements? (list->vector (hashtable-map h cons)) '#(((a) . aval) ((b) . bval) ((c) . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each h (lambda (key val) (vector-set! v i (cons key val)) (set! i (fx+ i 1))))
      v)
    '#(((a) . aval) ((b) . bval) ((c) . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each-cell h (lambda (a) (vector-set! v i a) (set! i (fx+ i 1))))
      v)
    '#(((a) . aval) ((b) . bval) ((c) . cval)))
  (equal? (hashtable-ref h ka 1) 'aval)
  (equal? (hashtable-ref h kb #f) 'bval)
  (equal? (hashtable-ref h kc 'nope) 'cval)
  (eqv? (hashtable-delete! h kb) (void))
  (equal? (hashtable-size h) 2)
  (same-elements? (hashtable-keys h) '#((a) (c)))
  (same-elements? (hashtable-values h) '#(aval cval))
  (equal-entries? (hashtable-entries h) '#((a) (c)) '#(aval cval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (eq-hashtable? h2)
         (hashtable-mutable? h2)
         (eq-hashtable-weak? h2)
         (hashtable-weak? h2)))
  (eq? (hashtable-hash-function h2) #f)
  (eq? (hashtable-equivalence-function h2) eq?)
  (equal? (hashtable-size h2) 2)
  (same-elements? (hashtable-keys h2) '#((a) (c)))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#((a) (c)) '#(aval cval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (hashtable-ref h ka 1)
      (hashtable-ref h kb #f)
      (hashtable-ref h kc 'nope))
   '(0 1 #f nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (hashtable-ref h2 ka 1)
      (hashtable-ref h2 kb #f)
      (hashtable-ref h2 kc 'nope))
    '(2 aval #f cval))
  (same-elements? (hashtable-keys h2) '#((a) (c)))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#((a) (c)) '#(aval cval))
  (eqv?
    (hashtable-update! h kq
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h kq #f) 18)
  (eqv?
    (hashtable-update! h kq
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h kq #f) 19)
  (equal? (hashtable-size h) 1)
  (same-elements? (hashtable-keys h) '#((q)))
  (same-elements? (hashtable-values h) '#(19))
  (eqv?
    (begin
      (set! kq (void))
      (collect (collect-maximum-generation))
      (hashtable-size h))
    0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  #;(eqv? (hashtable-map h (lambda args (error #f "oops"))) '())
  #;(eqv? (hashtable-for-each h (lambda args (error #f "oops"))) (void))
  #;(eqv? (hashtable-for-each-cell h (lambda args (error #f "oops"))) (void))
  (equal? (hashtable-ref h ky #f) #f)
  (eqv?
    (hashtable-set! h ky 'toad)
    (void))
  (equal? (hashtable-ref h ky #f) 'toad)
  (equal? (hashtable-ref h kz #f) #f)
  (eqv?
    (hashtable-update! h kz list 'frog)
    (void))
  (equal? (hashtable-ref h kz #f) '(frog))
  (same-elements? (hashtable-keys h) (vector ky kz))
  (same-elements? (hashtable-values h) (vector (hashtable-ref h kz #f) 'toad))
  (equal-entries?
    (hashtable-entries h)
    (vector kz ky)
    (vector (hashtable-ref h kz #f) 'toad))
  (eqv? (hashtable-ref h '(zippo) 'nil) 'nil)
  (begin
    (define h3 (hashtable-copy h2 #f))
    (and (hashtable? h3)
         (eq-hashtable? h3)
         (not (hashtable-mutable? h3))
         (eq-hashtable-weak? h3)
         (hashtable-weak? h3)))
  (same-elements? (hashtable-keys h2) '#((a) (c)))
  (same-elements? (hashtable-keys h3) '#((a) (c)))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (same-elements? (hashtable-values h3) '#(aval cval))
  (equal?
    (begin
      (set! ka (void))
      (collect (collect-maximum-generation))
      (list (hashtable-size h2) (hashtable-size h3)))
    '(1 1))
  (same-elements? (hashtable-keys h2) '#((c)))
  (same-elements? (hashtable-keys h3) '#((c)))
  (same-elements? (hashtable-values h2) '#(cval))
  (same-elements? (hashtable-values h3) '#(cval))
  (equal-entries? (hashtable-entries h2) '#((c)) '#(cval))
  (equal-entries? (hashtable-entries h3) '#((c)) '#(cval))
  (eqv?
    (begin
      (set! h3 (void))
      (collect (collect-maximum-generation))
      (hashtable-size h2))
    1)
  (same-elements? (hashtable-keys h2) '#((c)))
  (same-elements? (hashtable-values h2) '#(cval))
  (equal-entries? (hashtable-entries h2) '#((c)) '#(cval))

 ; test for proper shrinkage
  (eqv?
    (let ([ht (make-eq-hashtable 32)])
      (for-each
        (lambda (k*) (for-each (lambda (k) (hashtable-delete! ht k)) k*))
        (let ([k** (map (lambda (x) (map list (make-list 1000)))
                        (make-list 100))])
          (for-each
            (lambda (k*) (map (lambda (k) (hashtable-set! ht k 75)) k*))
            k**)
          k**))
      (#%$hashtable-veclen ht))
    32)

 ; test for proper shrinkage as objects are bwp'd
 ; uses delete to trigger final shrinkage
  (equal?
    (let* ([ht (make-weak-eq-hashtable 32)]
           [len (#%$hashtable-veclen ht)])
      (hashtable-set! ht 'a 'b)
      (for-each
        (lambda (k*) (map (lambda (k) (hashtable-set! ht k 75)) k*))
        (map (lambda (x) (map list (make-list 1000))) (make-list 100)))
      (collect (collect-maximum-generation))
      (hashtable-delete! ht 'a)
      (list (hashtable-size ht) (= (#%$hashtable-veclen ht) len)))
    '(0 #t))

  ; test that weak-hashtable values do not imply that values
  ; are reachable
  (let ([wk1 (list 1)]
        [wk2 (list 2)]
        [wk3 (list 3)]
        [wk4 (list 4)]
        [ht (make-weak-eq-hashtable)])
    (hashtable-set! ht wk1 wk1)
    (hashtable-set! ht wk2 wk1)
    (hashtable-set! ht wk3 wk3)
    (hashtable-set! ht wk4 wk2)
    (collect (collect-maximum-generation))
    (and
     (same-elements? (hashtable-keys ht) '#((1) (2) (3) (4)))
     (equal? (hashtable-ref ht wk1 #f) wk1)
     (equal? (hashtable-ref ht wk2 #f) wk1)
     (equal? (hashtable-ref ht wk3 #f) wk3)
     (equal? (hashtable-ref ht wk4 #f) wk2)
     (begin
       (set! wk1 #f)
       (set! wk2 #f)
       (set! wk3 #f)
       (collect (collect-maximum-generation))
       (and
        (same-elements? (hashtable-keys ht) '#((1) (2) (4)))
        (equal? (hashtable-ref ht wk4 #f) '(2))
        (begin
          (set! wk4 #f)
          (collect (collect-maximum-generation))
          (same-elements? (hashtable-keys ht) '#()))))))
)

(mat eq-hashtable-cell
  (let ()
    (define-record fribble (x))
    (define random-object
      (lambda (x)
        (case (random 9)
          [(0) (cons 'a 'b)]
          [(1) (vector 'c)]
          [(2) (string #\a #\b)]
          [(3) (make-fribble 'q)]
          [(4) (gensym)]
          [(5) (open-output-string)]
          [(6) (fxvector 15 55)]
          [(7) (lambda () x)]
          [else (box 'top)])))
    (let ([ls1 (let f ([n 10000])
                 (if (fx= n 0)
                     '()
                     (cons
                       (cons (random-object 4) (random-object 7))
                       (f (fx- n 1)))))]
          [ht (make-eq-hashtable)]
          [wht (make-weak-eq-hashtable)])
      (let ([ls2 (map (lambda (a1) (eq-hashtable-cell ht (car a1) (cdr a1))) ls1)]
            [ls3 (map (lambda (a1) (hashtable-cell wht (car a1) (cdr a1))) ls1)])
        (unless (andmap (lambda (a1 a2 a3)
                          (and (eq? (car a1) (car a2))
                               (eq? (car a2) (car a3))))
                        ls1 ls2 ls3)
          (errorf #f "keys are not eq"))
        (unless (andmap (lambda (a1 a2 a3)
                          (and (eq? (cdr a1) (cdr a2))
                               (eq? (cdr a2) (cdr a3))))
                        ls1 ls2 ls3)
          (errorf #f "values are not eq"))
        (for-each
          (lambda (a1)
            (when (fx< (random 10) 5)
              (set-car! a1 #f)))
          ls1)
        (let loop ([i (min (expt (collect-generation-radix) (collect-maximum-generation)) 1000)])
          (unless (fx= i 0)
            (collect)
            (unless (andmap (lambda (a2 a3) (eq? (car a2) (car a3))) ls2 ls3)
              (errorf #f "a2/a3 keys not eq after collection"))
            (unless (andmap (lambda (a3) (not (bwp-object? (car a3)))) ls3)
              (errorf #f "keys have been bwp'd"))
            (loop (fx- i 1))))
        (for-each
          (lambda (a2)
            (hashtable-delete! ht (car a2))
            (set-car! a2 #f))
          ls2)
        (unless (and (equal? (hashtable-keys ht) '#())
                     (equal? (hashtable-values ht) '#())
                     (zero? (hashtable-size ht)))
          (errorf #f "wht has not been cleared out"))
        (let loop ([i (min (expt (collect-generation-radix) (collect-maximum-generation)) 1000)])
          (unless (fx= i 0)
            (collect)
            (unless (andmap (lambda (a1 a3)
                              (or (not (car a1)) (eq? (car a1) (car a3))))
                            ls1 ls3)
              (errorf #f "a1/a3 keys not eq after collection"))
            (loop (fx- i 1))))
        (for-each
          (lambda (a1 a3)
            (unless (or (car a1) (bwp-object? (car a3)))
              (errorf #f "~s has not been bwp'd I" (car a3))))
          ls1 ls3)
        (for-each (lambda (a1) (set-car! a1 #f)) ls1)
        (collect (collect-maximum-generation))
        (unless (andmap (lambda (a3) (bwp-object? (car a3))) ls3)
          (errorf #f "keys have not been bwp'd II"))
        (unless (and (equal? (hashtable-keys wht) '#())
                     (equal? (hashtable-values wht) '#())
                     (zero? (hashtable-size ht)))
          (errorf #f "wht has not been cleared out"))))
    #t)
)

(mat $nonweak-eq-hashtable
  (begin
    (define h (make-eq-hashtable 32))
    (and (hashtable? h)
         (eq-hashtable? h)
         (hashtable-mutable? h)
         (not (eq-hashtable-weak? h))
         (not (hashtable-weak? h))))
  (eq? (hashtable-hash-function h) #f)
  (eq? (hashtable-equivalence-function h) eq?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (eq-hashtable-set! h 'a 'aval) (void))
  (equal?
    (list
       (eq-hashtable-contains? h 'a)
       (eq-hashtable-contains? h 'b)
       (eq-hashtable-contains? h 'c))
    '(#t #f #f))
  (eqv? (eq-hashtable-set! h 'b 'bval) (void))
  (equal?
    (list
       (eq-hashtable-contains? h 'a)
       (eq-hashtable-contains? h 'b)
       (eq-hashtable-contains? h 'c))
    '(#t #t #f))
  (eqv? (eq-hashtable-set! h 'c 'cval) (void))
  (equal?
    (list
       (eq-hashtable-contains? h 'a)
       (eq-hashtable-contains? h 'b)
       (eq-hashtable-contains? h 'c))
    '(#t #t #t))
  (equal? (hashtable-size h) 3)
  (same-elements? (hashtable-keys h) '#(a b c))
  (same-elements? (hashtable-values h) '#(bval cval aval))
  (equal-entries? (hashtable-entries h) '#(b c a) '#(bval cval aval))
  (equal? (eq-hashtable-ref h 'a 1) 'aval)
  (equal? (eq-hashtable-ref h 'b #f) 'bval)
  (equal? (eq-hashtable-ref h 'c 'nope) 'cval)
  (eqv? (eq-hashtable-delete! h 'b) (void))
  (equal? (hashtable-size h) 2)
  (same-elements? (hashtable-keys h) '#(a c))
  (same-elements? (hashtable-values h) '#(aval cval))
  (equal-entries? (hashtable-entries h) '#(a c) '#(aval cval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (eq-hashtable? h2)
         (hashtable-mutable? h2)
         (not (eq-hashtable-weak? h2))
         (not (hashtable-weak? h2))))
  (equal? (hashtable-size h2) 2)
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (eq-hashtable-ref h 'a 1)
      (eq-hashtable-ref h 'b #f)
      (eq-hashtable-ref h 'c 'nope))
   '(0 1 #f nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (eq-hashtable-ref h2 'a 1)
      (eq-hashtable-ref h2 'b #f)
      (eq-hashtable-ref h2 'c 'nope))
    '(2 aval #f cval))
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv?
    (eq-hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (eq-hashtable-ref h 'q #f) 18)
  (eqv?
    (eq-hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (eq-hashtable-ref h 'q #f) 19)
  (equal? (hashtable-size h) 1)
 ; test hashtable-copy when some keys may have moved
  (let ([t (parameterize ([collect-request-handler void])
             (let ([h4a (make-eq-hashtable 32)]
                   [k* (map list (make-list 100))])
               (for-each (lambda (x) (eq-hashtable-set! h4a x x)) k*)
               (collect)
              ; create copy after collection but before otherwise touching h4a
               (let ([h4b (hashtable-copy h4a #t)])
                 (andmap
                   (lambda (k) (eq? (eq-hashtable-ref h4b k #f) k))
                   k*))))])
    (collect)
    t)

 ; test for proper shrinkage, etc.
  (equal?
    (let* ([ht (make-eq-hashtable)] [minlen (#%$hashtable-veclen ht)])
      (define power-of-two? (lambda (n) (fx= (fxbit-count n) 1)))
      (let f ([i 0])
        (unless (fx= i (expt 2 17))
          (let ([k (fx* i 2)])
            (eq-hashtable-set! ht k i)
            (f (fx+ i 1))
            (assert (eq-hashtable-contains? ht k))
            (assert (power-of-two? (#%$hashtable-veclen ht)))
            (eq-hashtable-delete! ht k))))
      (list (hashtable-size ht) (fx= (#%$hashtable-veclen ht) minlen)))
    '(0 #t))

  (equal?
    (let ([ht (make-eq-hashtable 32)])
      (define power-of-two? (lambda (n) (fx= (fxbit-count n) 1)))
      (let f ([i 0])
        (unless (fx= i (expt 2 17))
          (let ([k (fx* i 2)])
            (eq-hashtable-set! ht k i)
            (f (fx+ i 1))
            (assert (eq-hashtable-contains? ht k))
            (assert (power-of-two? (#%$hashtable-veclen ht)))
            (eq-hashtable-delete! ht k))))
      (list (hashtable-size ht) (#%$hashtable-veclen ht)))
    '(0 32))
)

(mat $weak-eq-hashtable
  (begin
    (define ka (list 'a))
    (define kb (list 'b))
    (define kc (list 'c))
    (define kq (list 'q))
    (define ky (list 'y))
    (define kz (list 'z))
    #t)
  (begin
    (define h (make-weak-eq-hashtable 32))
    (and (hashtable? h)
         (eq-hashtable? h)
         (hashtable-mutable? h)
         (eq-hashtable-weak? h)
         (hashtable-weak? h)))
  (eq? (hashtable-hash-function h) #f)
  (eq? (hashtable-equivalence-function h) eq?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (eq-hashtable-set! h ka 'aval) (void))
  (equal?
    (list
       (eq-hashtable-contains? h ka)
       (eq-hashtable-contains? h kb)
       (eq-hashtable-contains? h kc))
    '(#t #f #f))
  (eqv? (eq-hashtable-set! h kb 'bval) (void))
  (equal?
    (list
       (eq-hashtable-contains? h ka)
       (eq-hashtable-contains? h kb)
       (eq-hashtable-contains? h kc))
    '(#t #t #f))
  (eqv? (eq-hashtable-set! h kc 'cval) (void))
  (equal?
    (list
       (eq-hashtable-contains? h ka)
       (eq-hashtable-contains? h kb)
       (eq-hashtable-contains? h kc))
    '(#t #t #t))
  (equal? (hashtable-size h) 3)
  (same-elements? (hashtable-keys h) '#((a) (b) (c)))
  (same-elements? (hashtable-values h) '#(aval bval cval))
  (equal-entries? (hashtable-entries h) '#((a) (b) (c)) '#(aval bval cval))
  (equal? (eq-hashtable-ref h ka 1) 'aval)
  (equal? (eq-hashtable-ref h kb #f) 'bval)
  (equal? (eq-hashtable-ref h kc 'nope) 'cval)
  (eqv? (eq-hashtable-delete! h kb) (void))
  (equal? (hashtable-size h) 2)
  (same-elements? (hashtable-keys h) '#((a) (c)))
  (same-elements? (hashtable-values h) '#(aval cval))
  (equal-entries? (hashtable-entries h) '#((a) (c)) '#(aval cval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (eq-hashtable? h2)
         (hashtable-mutable? h2)
         (hashtable-weak? h2)
         (eq-hashtable-weak? h2)))
  (equal? (hashtable-size h2) 2)
  (same-elements? (hashtable-keys h2) '#((a) (c)))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#((a) (c)) '#(aval cval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (eq-hashtable-ref h ka 1)
      (eq-hashtable-ref h kb #f)
      (eq-hashtable-ref h kc 'nope))
   '(0 1 #f nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (eq-hashtable-ref h2 ka 1)
      (eq-hashtable-ref h2 kb #f)
      (eq-hashtable-ref h2 kc 'nope))
    '(2 aval #f cval))
  (same-elements? (hashtable-keys h2) '#((a) (c)))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#((a) (c)) '#(aval cval))
  (eqv?
    (eq-hashtable-update! h kq
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (eq-hashtable-ref h kq #f) 18)
  (eqv?
    (eq-hashtable-update! h kq
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (eq-hashtable-ref h kq #f) 19)
  (equal? (hashtable-size h) 1)
  (same-elements? (hashtable-keys h) '#((q)))
  (same-elements? (hashtable-values h) '#(19))
  (eqv?
    (begin
      (set! kq (void))
      (collect (collect-maximum-generation))
      (hashtable-size h))
    0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal? (eq-hashtable-ref h ky #f) #f)
  (eqv?
    (eq-hashtable-set! h ky 'toad)
    (void))
  (equal? (eq-hashtable-ref h ky #f) 'toad)
  (equal? (eq-hashtable-ref h kz #f) #f)
  (eqv?
    (eq-hashtable-update! h kz list 'frog)
    (void))
  (equal? (eq-hashtable-ref h kz #f) '(frog))
  (same-elements? (hashtable-keys h) (vector ky kz))
  (same-elements? (hashtable-values h) (vector (eq-hashtable-ref h kz #f) 'toad))
  (equal-entries?
    (hashtable-entries h)
    (vector kz ky)
    (vector (eq-hashtable-ref h kz #f) 'toad))
  (eqv? (eq-hashtable-ref h '(zippo) 'nil) 'nil)
  (begin
    (define h3 (hashtable-copy h2 #f))
    (and (hashtable? h3)
         (eq-hashtable? h3)
         (not (hashtable-mutable? h3))
         (eq-hashtable-weak? h3)
         (hashtable-weak? h3)))
  (same-elements? (hashtable-keys h2) '#((a) (c)))
  (same-elements? (hashtable-keys h3) '#((a) (c)))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (same-elements? (hashtable-values h3) '#(aval cval))
  (equal?
    (begin
      (set! ka (void))
      (collect (collect-maximum-generation))
      (list (hashtable-size h2) (hashtable-size h3)))
    '(1 1))
  (same-elements? (hashtable-keys h2) '#((c)))
  (same-elements? (hashtable-keys h3) '#((c)))
  (same-elements? (hashtable-values h2) '#(cval))
  (same-elements? (hashtable-values h3) '#(cval))
  (equal-entries? (hashtable-entries h2) '#((c)) '#(cval))
  (equal-entries? (hashtable-entries h3) '#((c)) '#(cval))
  (eqv?
    (begin
      (set! h3 (void))
      (collect (collect-maximum-generation))
      (hashtable-size h2))
    1)
  (same-elements? (hashtable-keys h2) '#((c)))
  (same-elements? (hashtable-values h2) '#(cval))
  (equal-entries? (hashtable-entries h2) '#((c)) '#(cval))

 ; test for proper shrinkage
  (eqv?
    (let ([ht (make-eq-hashtable 32)])
      (for-each
        (lambda (k*) (for-each (lambda (k) (eq-hashtable-delete! ht k)) k*))
        (let ([k** (map (lambda (x) (map list (make-list 1000)))
                        (make-list 100))])
          (for-each
            (lambda (k*) (map (lambda (k) (eq-hashtable-set! ht k 75)) k*))
            k**)
          k**))
      (#%$hashtable-veclen ht))
    32)

 ; test for proper shrinkage as objects are bwp'd
 ; uses delete to trigger final shrinkage
  (equal?
    (let* ([ht (make-weak-eq-hashtable 32)]
           [len (#%$hashtable-veclen ht)])
      (eq-hashtable-set! ht 'a 'b)
      (for-each
        (lambda (k*) (map (lambda (k) (eq-hashtable-set! ht k 75)) k*))
        (map (lambda (x) (map list (make-list 1000))) (make-list 100)))
      (collect (collect-maximum-generation))
      (eq-hashtable-delete! ht 'a)
      (list (hashtable-size ht) (= (#%$hashtable-veclen ht) len)))
    '(0 #t))
)

(mat eq-strange
  (begin
    (define $ht (make-eq-hashtable))
    (define $wht (make-weak-eq-hashtable))
    (and (hashtable? $ht)
         (eq-hashtable? $ht)
         (hashtable? $wht)
         (eq-hashtable? $wht)))
  (eqv? (hashtable-set! $ht #f 75) (void))
  (eqv? (hashtable-ref $ht #f 80) 75)
  (eqv? (hashtable-set! $wht #f 75) (void))
  (eqv? (hashtable-ref $wht #f 80) 75)
  (eqv? (hashtable-set! $ht #!bwp "hello") (void))
  (equal? (hashtable-ref $ht #!bwp "goodbye") "hello")
  (eqv? (hashtable-set! $wht #!bwp "hello") (void))
  (and (member (hashtable-ref $wht #!bwp "goodbye") '("hello" "goodbye")) #t)
 ; make sure that association isn't added before procedure is called
  (equal?
    (begin
      (hashtable-update! $ht 'cupie
        (lambda (x) (hashtable-ref $ht 'cupie (cons 'barbie x)))
        'doll)
      (hashtable-ref $ht 'cupie 'oops))
   '(barbie . doll))
  (equal?
    (begin
      (hashtable-update! $wht 'cupie
        (lambda (x) (hashtable-ref $wht 'cupie (cons 'barbie x)))
        'doll)
      (hashtable-ref $wht 'cupie 'oops))
   '(barbie . doll))
)

(mat eq-hashtable-stress
 ; stress tests
  (let () ; nonweak
    (define pick
      (lambda (ls)
        (list-ref ls (random (length ls)))))
    (define ht (make-eq-hashtable 4))
    (let ([ls (remq '|| (oblist))] [n 50000])
      (let f ([i 0] [keep '()] [drop '()])
        (if (= i n)
            (and (= (hashtable-size ht) (- n (length drop)))
                 (andmap (lambda (k)
                           (string=?
                             (symbol->string (hashtable-ref ht k #f))
                             (cond
                               [(string? k) k]
                               [(pair? k) (car k)]
                               [(vector? k) (vector-ref k 0)])))
                         keep)
                 (andmap (lambda (k) (eq? (hashtable-ref ht k 'no) 'no))
                         drop))
            (let* ([x (pick ls)] [s (string-copy (symbol->string x))])
              (let ([k (case (pick '(string pair vector))
                         [(string) s]
                         [(pair) (list s)]
                         [(vector) (vector s)])])
                (hashtable-set! ht k x)
                (let ([keep (if (= (modulo i 5) 0) (cons k keep) keep)])
                  (if (= (modulo i 17) 5)
                      (let ([k (pick keep)])
                        (hashtable-delete! ht k)
                        (let ([drop (cons k drop)])
                          (when (= (random 5) 3)
                            (hashtable-delete! ht (pick drop)))
                          (f (+ i 1) (remq k keep) drop)))
                      (f (+ i 1) keep drop)))))))))

  (let () ; weak
    (define pick
      (lambda (ls)
        (list-ref ls (random (length ls)))))
    (define ht (make-weak-eq-hashtable 4))
    (let ([ls (remq '|| (oblist))] [n 50000])
      (let f ([i 0] [keep '()] [drop '()])
        (if (= i n)
            (and (<= (hashtable-size ht) (- n (length drop)))
                 (begin
                   (collect (collect-maximum-generation))
                   (= (hashtable-size ht) (length keep)))
                 (andmap (lambda (k)
                           (string=?
                             (symbol->string (hashtable-ref ht k #f))
                             (cond
                               [(string? k) k]
                               [(pair? k) (car k)]
                               [(vector? k) (vector-ref k 0)])))
                         keep)
                 (andmap (lambda (k) (eq? (hashtable-ref ht k 'no) 'no))
                         drop))
            (let* ([x (pick ls)] [s (string-copy (symbol->string x))])
              (let ([k (case (pick '(string pair vector))
                         [(string) s]
                         [(pair) (list s)]
                         [(vector) (vector s)])])
                (hashtable-set! ht k x)
                (let ([keep (if (= (modulo i 5) 0) (cons k keep) keep)])
                  (if (= (modulo i 17) 5)
                      (let ([k (pick keep)])
                        (hashtable-delete! ht k)
                        (let ([drop (cons k drop)])
                          (when (= (random 5) 3)
                            (hashtable-delete! ht (pick drop)))
                          (f (+ i 1) (remq k keep) drop)))
                      (f (+ i 1) keep drop)))))))))

)

(mat nonweak-eqv-hashtable
  (begin
    (define h (make-eqv-hashtable 32))
    (and (hashtable? h)
         (not (eq-hashtable? h))
         (hashtable-mutable? h)
         (not (hashtable-weak? h))))
  (eq? (hashtable-hash-function h) #f)
  (eq? (hashtable-equivalence-function h) eqv?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (hashtable-set! h 'a 'aval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 3.4)
       (hashtable-contains? h 'c))
    '(#t #f #f))
  (eqv? (hashtable-set! h 3.4 'bval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 3.4)
       (hashtable-contains? h 'c))
    '(#t #t #f))
  (eqv? (hashtable-set! h 'c 'cval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 3.4)
       (hashtable-contains? h 'c))
    '(#t #t #t))
  (equal? (hashtable-size h) 3)
  (same-elements? (hashtable-keys h) '#(a 3.4 c))
  (same-elements? (hashtable-values h) '#(bval cval aval))
  (equal-entries? (hashtable-entries h) '#(3.4 c a) '#(bval cval aval))
  #;(same-elements? (list->vector (hashtable-map h cons)) '#((a . aval) (3.4 . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each h (lambda (key val) (vector-set! v i (cons key val)) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (3.4 . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each-cell h (lambda (a) (vector-set! v i a) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (3.4 . bval) (c . cval)))
  (equal? (hashtable-ref h 'a 1) 'aval)
  (equal? (hashtable-ref h 3.4 #f) 'bval)
  (equal? (hashtable-ref h 'c 'nope) 'cval)
  (eqv? (hashtable-delete! h 3.4) (void))
  (equal? (hashtable-size h) 2)
  (same-elements? (hashtable-keys h) '#(a c))
  (same-elements? (hashtable-values h) '#(aval cval))
  (equal-entries? (hashtable-entries h) '#(a c) '#(aval cval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (hashtable-mutable? h2)
         (not (hashtable-weak? h2))))
  (eq? (hashtable-hash-function h2) #f)
  (eq? (hashtable-equivalence-function h2) eqv?)
  (equal? (hashtable-size h2) 2)
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (hashtable-ref h 'a 1)
      (hashtable-ref h 3.4 #f)
      (hashtable-ref h 'c 'nope))
   '(0 1 #f nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (hashtable-ref h2 'a 1)
      (hashtable-ref h2 3.4 #f)
      (hashtable-ref h2 'c 'nope))
    '(2 aval #f cval))
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv?
    (hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h 'q #f) 18)
  (eqv?
    (hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h 'q #f) 19)
  (equal? (hashtable-size h) 1)
 ; test hashtable-copy when some keys may have moved
  (let ([t (parameterize ([collect-request-handler void])
             (let ([h4a (make-eqv-hashtable 32)]
                   [k* (map list (make-list 100))])
               (for-each (lambda (x) (hashtable-set! h4a x x)) k*)
               (collect)
              ; create copy after collection but before otherwise touching h4a
               (let ([h4b (hashtable-copy h4a #t)])
                 (andmap
                   (lambda (k) (eqv? (hashtable-ref h4b k #f) k))
                   k*))))])
    (collect)
    t)

 ; test for proper shrinkage
  (equal?
    (let ([ht (make-eqv-hashtable 32)])
      (for-each
        (lambda (k*) (for-each (lambda (k) (hashtable-delete! ht k)) k*))
        (let ([k** (map (lambda (x) (map list (make-list 1000)))
                        (make-list 100))])
          (for-each
            (lambda (k*) (map (lambda (k) (hashtable-set! ht k 75)) k*))
            k**)
          k**))
      (call-with-values (lambda () (#%$hashtable-veclen ht)) cons))
    '(32 . 32))
)

(mat weak-eqv-hashtable
  (begin
    (define ka (list 'a))
    (define kb (list 'b))
    (define kc (list 'c))
    (define kq (list 'q))
    (define ky (list 'y))
    (define kz (list 'z))
    (define km -5.75)
    (define kn 17)
    (define ko (+ (most-positive-fixnum) 5))
    #t)
  (begin
    (define h (make-weak-eqv-hashtable 32))
    (and (hashtable? h)
         (not (eq-hashtable? h))
         (hashtable-mutable? h)
         (hashtable-weak? h)))
  (eq? (hashtable-hash-function h) #f)
  (eq? (hashtable-equivalence-function h) eqv?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (hashtable-set! h ka 'aval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc)
       (hashtable-contains? h km)
       (hashtable-contains? h kn)
       (hashtable-contains? h ko))
    '(#t #f #f #f #f #f))
  (eqv? (hashtable-set! h kb 'bval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc)
       (hashtable-contains? h km)
       (hashtable-contains? h kn)
       (hashtable-contains? h ko))
    '(#t #t #f #f #f #f))
  (eqv? (hashtable-set! h kc 'cval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc)
       (hashtable-contains? h km)
       (hashtable-contains? h kn)
       (hashtable-contains? h ko))
    '(#t #t #t #f #f #f))
  (eqv? (hashtable-set! h km 'mval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc)
       (hashtable-contains? h km)
       (hashtable-contains? h kn)
       (hashtable-contains? h ko))
    '(#t #t #t #t #f #f))
  (eqv? (hashtable-set! h kn 'nval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc)
       (hashtable-contains? h km)
       (hashtable-contains? h kn)
       (hashtable-contains? h ko))
    '(#t #t #t #t #t #f))
  (eqv? (hashtable-set! h ko 'oval) (void))
  (equal?
    (list
       (hashtable-contains? h ka)
       (hashtable-contains? h kb)
       (hashtable-contains? h kc)
       (hashtable-contains? h km)
       (hashtable-contains? h kn)
       (hashtable-contains? h ko))
    '(#t #t #t #t #t #t))
  (equal? (hashtable-size h) 6)
  (same-elements? (hashtable-keys h) `#((a) (b) (c) -5.75 17 ,ko))
  (same-elements? (hashtable-values h) '#(aval bval cval mval nval oval))
  (equal-entries? (hashtable-entries h) `#((a) (b) (c) -5.75 17 ,ko) '#(aval bval cval mval nval oval))
  #;(same-elements?
    (list->vector (hashtable-map h cons))
    `#(((a) . aval) ((b) . bval) ((c) . cval) (-5.75 . mval) (17 . nval) (,ko . oval)))
  #;(same-elements?
    (let ([v (make-vector 6)] [i 0])
      (hashtable-for-each h (lambda (key val) (vector-set! v i (cons key val)) (set! i (fx+ i 1))))
      v)
    `#(((a) . aval) ((b) . bval) ((c) . cval) (-5.75 . mval) (17 . nval) (,ko . oval)))
  #;(same-elements?
    (let ([v (make-vector 6)] [i 0])
      (hashtable-for-each-cell h (lambda (a) (vector-set! v i a) (set! i (fx+ i 1))))
      v)
    `#(((a) . aval) ((b) . bval) ((c) . cval) (-5.75 . mval) (17 . nval) (,ko . oval)))
  (eq? (hashtable-ref h ka 1) 'aval)
  (eq? (hashtable-ref h kb #f) 'bval)
  (eq? (hashtable-ref h kc 'nope) 'cval)
  (eq? (hashtable-ref h (+ 2 -7.75) 'ugh) 'mval)
  (eq? (hashtable-ref h (/ 34 2) 'ugh) 'nval)
  (eq? (hashtable-ref h (+ (most-positive-fixnum) 7 -2) 'ugh) 'oval)
  (eqv? (hashtable-delete! h kb) (void))
  (equal? (hashtable-size h) 5)
  (same-elements? (hashtable-keys h) `#((a) (c) -5.75 17 ,ko))
  (same-elements? (hashtable-values h) '#(aval cval mval nval oval))
  (equal-entries? (hashtable-entries h)  `#((a) (c) -5.75 17 ,ko) '#(aval cval mval nval oval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (hashtable-mutable? h2)
         (hashtable-weak? h2)))
  (eq? (hashtable-hash-function h2) #f)
  (eq? (hashtable-equivalence-function h2) eqv?)
  (equal? (hashtable-size h2) 5)
  (same-elements? (hashtable-keys h) `#((a) (c) -5.75 17 ,ko))
  (same-elements? (hashtable-values h) '#(aval cval mval nval oval))
  (equal-entries? (hashtable-entries h)  `#((a) (c) -5.75 17 ,ko) '#(aval cval mval nval oval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (hashtable-ref h ka 1)
      (hashtable-ref h kb #f)
      (hashtable-ref h kc 'nope)
      (hashtable-ref h km 'nope)
      (hashtable-ref h kn 'nope)
      (hashtable-ref h ko 'nope))
   '(0 1 #f nope nope nope nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (hashtable-ref h2 ka 1)
      (hashtable-ref h2 kb #f)
      (hashtable-ref h2 kc 'nope)
      (hashtable-ref h2 (- (+ km 1) 1) 'nope)
      (hashtable-ref h2 (- (+ kn 1) 1) 'nope)
      (hashtable-ref h2 (- (+ ko 1) 1) 'nope))
    '(5 aval #f cval mval nval oval))
  (same-elements? (hashtable-keys h2) `#((a) (c) -5.75 17 ,ko))
  (same-elements? (hashtable-values h2) '#(aval cval mval nval oval))
  (equal-entries? (hashtable-entries h2)  `#((a) (c) -5.75 17 ,ko) '#(aval cval mval nval oval))
  (eqv?
    (hashtable-update! h kq
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h kq #f) 18)
  (eqv?
    (hashtable-update! h kq
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h kq #f) 19)
  (equal? (hashtable-size h) 1)
  (same-elements? (hashtable-keys h) '#((q)))
  (eqv?
    (begin
      (set! kq (void))
      (collect (collect-maximum-generation))
      (hashtable-size h))
    0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal? (hashtable-ref h ky #f) #f)
  (eqv?
    (hashtable-set! h ky 'toad)
    (void))
  (equal? (hashtable-ref h ky #f) 'toad)
  (equal? (hashtable-ref h kz #f) #f)
  (eqv?
    (hashtable-update! h kz list 'frog)
    (void))
  (equal? (hashtable-ref h kz #f) '(frog))
  (same-elements? (hashtable-keys h) (vector ky kz))
  (same-elements? (hashtable-values h) (vector (hashtable-ref h kz #f) 'toad))
  (equal-entries?
    (hashtable-entries h)
    (vector kz ky)
    (vector (hashtable-ref h kz #f) 'toad))
  (eqv? (hashtable-ref h '(zippo) 'nil) 'nil)
  (begin
    (define h3 (hashtable-copy h2 #f))
    (and (hashtable? h3)
         (not (hashtable-mutable? h3))
         (hashtable-weak? h3)))
  (same-elements? (hashtable-keys h2) `#((a) (c) -5.75 17 ,ko))
  (same-elements? (hashtable-keys h3) `#((a) (c) -5.75 17 ,ko))
  (equal?
    (begin
      (set! ka (void))
      (set! km (void))
      (set! kn (void))
      (set! ko (void))
      (collect (collect-maximum-generation))
      (list (hashtable-size h2) (hashtable-size h3)))
    '(4 4))
  (same-elements? (hashtable-keys h2) `#((c) -5.75 17 ,(+ (most-positive-fixnum) 5)))
  (same-elements? (hashtable-keys h3) `#((c) -5.75 17 ,(+ (most-positive-fixnum) 5)))
  (same-elements? (hashtable-values h2) '#(cval mval nval oval))
  (same-elements? (hashtable-values h3) '#(cval mval nval oval))
  (equal-entries? (hashtable-entries h2)  `#((c) -5.75 17 ,(+ (most-positive-fixnum) 5)) '#(cval mval nval oval))
  (equal-entries? (hashtable-entries h3)  `#((c) -5.75 17 ,(+ (most-positive-fixnum) 5)) '#(cval mval nval oval))
  (eqv?
    (begin
      (set! h3 (void))
      (collect (collect-maximum-generation))
      (hashtable-size h2))
    4)
  (same-elements? (hashtable-keys h2) `#((c) -5.75 17 ,(+ (most-positive-fixnum) 5)))
  (same-elements? (hashtable-values h2) '#(cval mval nval oval))
  (equal-entries? (hashtable-entries h2)  `#((c) -5.75 17 ,(+ (most-positive-fixnum) 5)) '#(cval mval nval oval))

 ; test for proper shrinkage
  (equal?
    (let ([ht (make-eqv-hashtable 32)])
      (for-each
        (lambda (k*) (for-each (lambda (k) (hashtable-delete! ht k)) k*))
        (let ([k** (map (lambda (x) (map list (make-list 1000)))
                        (make-list 100))])
          (for-each
            (lambda (k*) (map (lambda (k) (hashtable-set! ht k 75)) k*))
            k**)
          k**))
      (call-with-values (lambda () (#%$hashtable-veclen ht)) cons))
    '(32 . 32))

 ; test for proper shrinkage as objects are bwp'd
 ; uses delete to trigger final shrinkage
  (equal?
    (let ([ht (make-weak-eqv-hashtable 32)])
      (hashtable-set! ht 'a 'b)
      (for-each
        (lambda (k*) (map (lambda (k) (hashtable-set! ht k 75)) k*))
        (map (lambda (x) (map list (make-list 1000))) (make-list 100)))
      (collect (collect-maximum-generation))
      (hashtable-delete! ht 'a)
      (list (hashtable-size ht)
            (let-values ([(n1 n2) (#%$hashtable-veclen ht)])
              (= n1 n2 32))))
    '(0 #t))
)

(mat eqv-hashtable-cell
  (let ()
    (define-record fribble (x))
    (define random-object
      (lambda (x)
        (case (random 9)
          [(0) (cons 'a 3.4)]
          [(1) (vector 'c)]
          [(2) (string #\a #\b)]
          [(3) (make-fribble 'q)]
          [(4) (gensym)]
          [(5) (open-output-string)]
          [(6) (fxvector 15 55)]
          [(7) (lambda () x)]
          [else (box 'top)])))
    (let ([ls1 (let f ([n 10000])
                 (if (fx= n 0)
                     '()
                     (cons
                       (cons (random-object 4) (random-object 7))
                       (f (fx- n 1)))))]
          [ht (make-eqv-hashtable)]
          [wht (make-weak-eqv-hashtable)])
      (let ([ls2 (map (lambda (a1) (hashtable-cell ht (car a1) (cdr a1))) ls1)]
            [ls3 (map (lambda (a1) (hashtable-cell wht (car a1) (cdr a1))) ls1)])
        (unless (andmap (lambda (a1 a2 a3)
                          (and (eqv? (car a1) (car a2))
                               (eqv? (car a2) (car a3))))
                        ls1 ls2 ls3)
          (errorf #f "keys are not eqv"))
        (unless (andmap (lambda (a1 a2 a3)
                          (and (eqv? (cdr a1) (cdr a2))
                               (eqv? (cdr a2) (cdr a3))))
                        ls1 ls2 ls3)
          (errorf #f "values are not eqv"))
        (for-each
          (lambda (a1)
            (when (fx< (random 10) 5)
              (set-car! a1 #f)))
          ls1)
        (let loop ([i (min (expt (collect-generation-radix) (collect-maximum-generation)) 1000)])
          (unless (fx= i 0)
            (collect)
            (unless (andmap (lambda (a2 a3) (eqv? (car a2) (car a3))) ls2 ls3)
              (errorf #f "a2/a3 keys not eqv after collection"))
            (unless (andmap (lambda (a3) (not (bwp-object? (car a3)))) ls3)
              (errorf #f "keys have been bwp'd"))
            (loop (fx- i 1))))
        (for-each
          (lambda (a2)
            (hashtable-delete! ht (car a2))
            (set-car! a2 #f))
          ls2)
        (unless (and (equal? (hashtable-keys ht) '#())
                     (equal? (hashtable-values ht) '#())
                     (zero? (hashtable-size ht)))
          (errorf #f "wht has not been cleared out"))
        (let loop ([i (min (expt (collect-generation-radix) (collect-maximum-generation)) 1000)])
          (unless (fx= i 0)
            (collect)
            (unless (andmap (lambda (a1 a3)
                              (or (not (car a1)) (eqv? (car a1) (car a3))))
                            ls1 ls3)
              (errorf #f "a1/a3 keys not eqv after collection"))
            (loop (fx- i 1))))
        (for-each
          (lambda (a1 a3)
            (unless (or (car a1) (bwp-object? (car a3)))
              (errorf #f "~s has not been bwp'd I" (car a3))))
          ls1 ls3)
        (for-each (lambda (a1) (set-car! a1 #f)) ls1)
        (collect (collect-maximum-generation))
        (unless (andmap (lambda (a3) (bwp-object? (car a3))) ls3)
          (errorf #f "keys have not been bwp'd II"))
        (unless (and (equal? (hashtable-keys wht) '#())
                     (equal? (hashtable-values ht) '#())
                     (zero? (hashtable-size ht)))
          (errorf #f "wht has not been cleared out"))))
    #t)
)

(mat eqv-strange
  (begin
    (define $ht (make-eqv-hashtable))
    (define $wht (make-weak-eqv-hashtable))
    (and (hashtable? $ht)
         (hashtable? $wht)))
  (eqv? (hashtable-set! $ht #f 75) (void))
  (eqv? (hashtable-ref $ht #f 80) 75)
  (eqv? (hashtable-set! $wht #f 75) (void))
  (eqv? (hashtable-ref $wht #f 80) 75)
  (eqv? (hashtable-set! $ht #!bwp "hello") (void))
  (equal? (hashtable-ref $ht #!bwp "goodbye") "hello")
  (eqv? (hashtable-set! $wht #!bwp "hello") (void))
  (and (member (hashtable-ref $wht #!bwp "goodbye") '("hello" "goodbye")) #t)
 ; make sure that association isn't added before procedure is called
  (equal?
    (begin
      (hashtable-update! $ht 'cupie
        (lambda (x) (hashtable-ref $ht 'cupie (cons 'barbie x)))
        'doll)
      (hashtable-ref $ht 'cupie 'oops))
   '(barbie . doll))
  (equal?
    (begin
      (hashtable-update! $wht 'cupie
        (lambda (x) (hashtable-ref $wht 'cupie (cons 'barbie x)))
        'doll)
      (hashtable-ref $wht 'cupie 'oops))
   '(barbie . doll))
)

(mat eqv-hashtable-stress
 ; stress tests
  (let () ; nonweak
    (define pick
      (lambda (ls)
        (list-ref ls (random (length ls)))))
    (define ht (make-eqv-hashtable 4))
    (let ([ls (remq '|| (oblist))] [n 50000])
      (let f ([i 0] [keep '()] [drop '()])
        (if (= i n)
            (and (= (hashtable-size ht) (- n (length drop)))
                 (andmap (lambda (k)
                           (string=?
                             (symbol->string (hashtable-ref ht k #f))
                             (cond
                               [(string? k) k]
                               [(pair? k) (car k)]
                               [(vector? k) (vector-ref k 0)])))
                         keep)
                 (andmap (lambda (k) (eqv? (hashtable-ref ht k 'no) 'no))
                         drop))
            (let* ([x (pick ls)] [s (string-copy (symbol->string x))])
              (let ([k (case (pick '(string pair vector))
                         [(string) s]
                         [(pair) (list s)]
                         [(vector) (vector s)])])
                (hashtable-set! ht k x)
                (let ([keep (if (= (modulo i 5) 0) (cons k keep) keep)])
                  (if (= (modulo i 17) 5)
                      (let ([k (pick keep)])
                        (hashtable-delete! ht k)
                        (let ([drop (cons k drop)])
                          (when (= (random 5) 3)
                            (hashtable-delete! ht (pick drop)))
                          (f (+ i 1) (remq k keep) drop)))
                      (f (+ i 1) keep drop)))))))))

  (let () ; weak
    (define pick
      (lambda (ls)
        (list-ref ls (random (length ls)))))
    (define ht (make-weak-eqv-hashtable 4))
    (let ([ls (remq '|| (oblist))] [n 50000])
      (let f ([i 0] [keep '()] [drop '()])
        (if (= i n)
            (and (<= (hashtable-size ht) (- n (length drop)))
                 (begin
                   (collect (collect-maximum-generation))
                   (= (hashtable-size ht) (length keep)))
                 (andmap (lambda (k)
                           (string=?
                             (symbol->string (hashtable-ref ht k #f))
                             (cond
                               [(string? k) k]
                               [(pair? k) (car k)]
                               [(vector? k) (vector-ref k 0)])))
                         keep)
                 (andmap (lambda (k) (eqv? (hashtable-ref ht k 'no) 'no))
                         drop))
            (let* ([x (pick ls)] [s (string-copy (symbol->string x))])
              (let ([k (case (pick '(string pair vector))
                         [(string) s]
                         [(pair) (list s)]
                         [(vector) (vector s)])])
                (hashtable-set! ht k x)
                (let ([keep (if (= (modulo i 5) 0) (cons k keep) keep)])
                  (if (= (modulo i 17) 5)
                      (let ([k (pick keep)])
                        (hashtable-delete! ht k)
                        (let ([drop (cons k drop)])
                          (when (= (random 5) 3)
                            (hashtable-delete! ht (pick drop)))
                          (f (+ i 1) (remq k keep) drop)))
                      (f (+ i 1) keep drop)))))))))

)

(mat symbol-hashtable
  (let ([ht (make-hashtable symbol-hash eq?)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) eq?)))
  (let ([ht (make-hashtable symbol-hash eqv?)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) eqv?)))
  (let ([ht (make-hashtable symbol-hash equal?)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) equal?)))
  (let ([ht (make-hashtable symbol-hash symbol=?)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) symbol=?)))
  (let ([ht (make-hashtable symbol-hash eq? 17)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) eq?)))
  (let ([ht (make-hashtable symbol-hash eqv? 17)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) eqv?)))
  (let ([ht (make-hashtable symbol-hash equal? 17)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) equal?)))
  (let ([ht (make-hashtable symbol-hash symbol=? 17)])
    (and (symbol-hashtable? ht) (eq? (hashtable-equivalence-function ht) symbol=?)))
  (begin
    (define h (make-hashtable symbol-hash eq? 32))
    (and (hashtable? h)
         (symbol-hashtable? h)
         (hashtable-mutable? h)
         (not (eq-hashtable? h))
         (not (hashtable-weak? h))))
  (eq? (hashtable-hash-function h) symbol-hash)
  (eq? (hashtable-equivalence-function h) eq?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (hashtable-set! h 'a 'aval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 'b)
       (hashtable-contains? h 'c))
    '(#t #f #f))
  (eqv? (hashtable-set! h 'b 'bval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 'b)
       (hashtable-contains? h 'c))
    '(#t #t #f))
  (eqv? (hashtable-set! h 'c 'cval) (void))
  (equal?
    (list
       (hashtable-contains? h 'a)
       (hashtable-contains? h 'b)
       (hashtable-contains? h 'c))
    '(#t #t #t))
  (equal? (hashtable-size h) 3)
  (same-elements? (hashtable-keys h) '#(a b c))
  (same-elements? (hashtable-values h) '#(bval cval aval))
  (equal-entries? (hashtable-entries h) '#(b c a) '#(bval cval aval))
  #;(same-elements? (list->vector (hashtable-map h cons)) '#((a . aval) (b . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each h (lambda (key val) (vector-set! v i (cons key val)) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (b . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each-cell h (lambda (a) (vector-set! v i a) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (b . bval) (c . cval)))
  (equal? (hashtable-ref h 'a 1) 'aval)
  (equal? (hashtable-ref h 'b #f) 'bval)
  (equal? (hashtable-ref h 'c 'nope) 'cval)
  (eqv? (hashtable-delete! h 'b) (void))
  (equal? (hashtable-size h) 2)
  (same-elements? (hashtable-keys h) '#(a c))
  (same-elements? (hashtable-values h) '#(aval cval))
  (equal-entries? (hashtable-entries h) '#(a c) '#(aval cval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (symbol-hashtable? h2)
         (hashtable-mutable? h2)
         (not (hashtable-weak? h2))
         (not (eq-hashtable? h2))))
  (eq? (hashtable-hash-function h2) symbol-hash)
  (eq? (hashtable-equivalence-function h2) eq?)
  (equal? (hashtable-size h2) 2)
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (hashtable-ref h 'a 1)
      (hashtable-ref h 'b #f)
      (hashtable-ref h 'c 'nope))
   '(0 1 #f nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (hashtable-ref h2 'a 1)
      (hashtable-ref h2 'b #f)
      (hashtable-ref h2 'c 'nope))
    '(2 aval #f cval))
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv?
    (hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h 'q #f) 18)
  (eqv?
    (hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (hashtable-ref h 'q #f) 19)
  (equal? (hashtable-size h) 1)
 ; test hashtable-copy when some keys may have moved
 ; symbol hashes don't change, but keeping test adapted from eq-hashtable mats anyway
  (let ([t (parameterize ([collect-request-handler void])
             (let ([h4a (make-hashtable symbol-hash eqv? 32)]
                   [k* (list-head (oblist) 100)])
               (for-each (lambda (x) (hashtable-set! h4a x x)) k*)
               (collect)
              ; create copy after collection but before otherwise touching h4a
               (let ([h4b (hashtable-copy h4a #t)])
                 (andmap
                   (lambda (k) (eq? (hashtable-ref h4b k #f) k))
                   k*))))])
    (collect)
    t)
 ; test for proper shrinkage
  (eqv?
    (let ([ht (make-hashtable symbol-hash equal? 32)])
      (for-each
        (lambda (k*) (for-each (lambda (k) (hashtable-delete! ht k)) k*))
        (let ([k** (map (lambda (x) (list-head (oblist) 1000)) (make-list 100))])
          (for-each
            (lambda (k*) (map (lambda (k) (hashtable-set! ht k 75)) k*))
            k**)
          k**))
      (#%$hashtable-veclen ht))
    32)
)

(mat $symbol-hashtable
  (begin
    (define h (make-hashtable symbol-hash eq? 32))
    (and (hashtable? h)
         (symbol-hashtable? h)
         (hashtable-mutable? h)
         (not (eq-hashtable? h))
         (not (hashtable-weak? h))))
  (eq? (hashtable-hash-function h) symbol-hash)
  (eq? (hashtable-equivalence-function h) eq?)
  (equal? (hashtable-size h) 0)
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (eqv? (symbol-hashtable-set! h 'a 'aval) (void))
  (equal?
    (list
       (symbol-hashtable-contains? h 'a)
       (symbol-hashtable-contains? h 'b)
       (symbol-hashtable-contains? h 'c))
    '(#t #f #f))
  (eqv? (symbol-hashtable-set! h 'b 'bval) (void))
  (equal?
    (list
       (symbol-hashtable-contains? h 'a)
       (symbol-hashtable-contains? h 'b)
       (symbol-hashtable-contains? h 'c))
    '(#t #t #f))
  (eqv? (symbol-hashtable-set! h 'c 'cval) (void))
  (equal?
    (list
       (symbol-hashtable-contains? h 'a)
       (symbol-hashtable-contains? h 'b)
       (symbol-hashtable-contains? h 'c))
    '(#t #t #t))
  (equal? (hashtable-size h) 3)
  (same-elements? (hashtable-keys h) '#(a b c))
  (same-elements? (hashtable-values h) '#(bval cval aval))
  (equal-entries? (hashtable-entries h) '#(b c a) '#(bval cval aval))
  #;(same-elements? (list->vector (hashtable-map h cons)) '#((a . aval) (b . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each h (lambda (key val) (vector-set! v i (cons key val)) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (b . bval) (c . cval)))
  #;(same-elements?
    (let ([v (make-vector 3)] [i 0])
      (hashtable-for-each-cell h (lambda (a) (vector-set! v i a) (set! i (fx+ i 1))))
      v)
    '#((a . aval) (b . bval) (c . cval)))
  (equal? (symbol-hashtable-ref h 'a 1) 'aval)
  (equal? (symbol-hashtable-ref h 'b #f) 'bval)
  (equal? (symbol-hashtable-ref h 'c 'nope) 'cval)
  (eqv? (symbol-hashtable-delete! h 'b) (void))
  (equal? (hashtable-size h) 2)
  (same-elements? (hashtable-keys h) '#(a c))
  (same-elements? (hashtable-values h) '#(aval cval))
  (equal-entries? (hashtable-entries h) '#(a c) '#(aval cval))
  (begin
    (define h2 (hashtable-copy h #t))
    (and (hashtable? h2)
         (symbol-hashtable? h2)
         (hashtable-mutable? h2)
         (not (hashtable-weak? h2))
         (not (eq-hashtable? h2))))
  (eq? (hashtable-hash-function h2) symbol-hash)
  (eq? (hashtable-equivalence-function h2) eq?)
  (equal? (hashtable-size h2) 2)
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv? (hashtable-clear! h 4) (void))
  (equal?
    (list
      (hashtable-size h)
      (symbol-hashtable-ref h 'a 1)
      (symbol-hashtable-ref h 'b #f)
      (symbol-hashtable-ref h 'c 'nope))
   '(0 1 #f nope))
  (same-elements? (hashtable-keys h) '#())
  (same-elements? (hashtable-values h) '#())
  (equal-entries? (hashtable-entries h) '#() '#())
  (equal?
    (list
      (hashtable-size h2)
      (symbol-hashtable-ref h2 'a 1)
      (symbol-hashtable-ref h2 'b #f)
      (symbol-hashtable-ref h2 'c 'nope))
    '(2 aval #f cval))
  (same-elements? (hashtable-keys h2) '#(a c))
  (same-elements? (hashtable-values h2) '#(aval cval))
  (equal-entries? (hashtable-entries h2) '#(a c) '#(aval cval))
  (eqv?
    (symbol-hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (symbol-hashtable-ref h 'q #f) 18)
  (eqv?
    (symbol-hashtable-update! h 'q
      (lambda (x) (+ x 1))
      17)
    (void))
  (equal? (symbol-hashtable-ref h 'q #f) 19)
  (equal? (hashtable-size h) 1)
  (let ([g (gensym)] [s "feisty"])
    (let ([a (symbol-hashtable-cell h g s)])
      (and (pair? a)
           (eq? (car a) g)
           (eq? (cdr a) s)
           (begin
             (hashtable-set! h g 'feisty)
             (eq? (cdr a) 'feisty))
           (begin
             (set-cdr! a (list "feisty"))
             (equal? (hashtable-ref h g #f) '("feisty"))))))
 ; test hashtable-copy when some keys may have moved
 ; symbol hashes don't change, but keeping test adapted from eq-hashtable mats anyway
  (let ([t (parameterize ([collect-request-handler void])
             (let ([h4a (make-hashtable symbol-hash eqv? 32)]
                   [k* (list-head (oblist) 100)])
               (for-each (lambda (x) (symbol-hashtable-set! h4a x x)) k*)
               (collect)
              ; create copy after collection but before otherwise touching h4a
               (let ([h4b (hashtable-copy h4a #t)])
                 (andmap
                   (lambda (k) (eq? (symbol-hashtable-ref h4b k #f) k))
                   k*))))])
    (collect)
    t)
 ; test for proper shrinkage
  (eqv?
    (let ([ht (make-hashtable symbol-hash equal? 32)])
      (for-each
        (lambda (k*) (for-each (lambda (k) (symbol-hashtable-delete! ht k)) k*))
        (let ([k** (map (lambda (x) (list-head (oblist) 1000)) (make-list 100))])
          (for-each
            (lambda (k*) (map (lambda (k) (symbol-hashtable-set! ht k 75)) k*))
            k**)
          k**))
      (#%$hashtable-veclen ht))
    32)
)

(mat symbol-hashtable-stress
 ; stress tests
  (let () ; nonweak
    (define pick
      (lambda (ls)
        (list-ref ls (random (length ls)))))
    (define ht (make-hashtable symbol-hash eq? 4))
    (let ([ls (remq '|| (oblist))] [n 50000])
      (let f ([i 0] [keep '()] [drop '()])
        (if (= i n)
            (and (= (hashtable-size ht) (- n (length drop)))
                 (andmap (lambda (k)
                           (string=?
                             (symbol->string (hashtable-ref ht k #f))
                             (symbol->string k)))
                         keep)
                 (andmap (lambda (k) (eq? (hashtable-ref ht k 'no) 'no))
                         drop))
            (let* ([x (pick ls)] [s (string-copy (symbol->string x))])
              (let ([k (gensym s)])
                (hashtable-set! ht k x)
                (let ([keep (if (= (modulo i 5) 0) (cons k keep) keep)])
                  (if (= (modulo i 17) 5)
                      (let ([k (pick keep)])
                        (hashtable-delete! ht k)
                        (let ([drop (cons k drop)])
                          (when (= (random 5) 3)
                            (hashtable-delete! ht (pick drop)))
                          (f (+ i 1) (remq k keep) drop)))
                      (f (+ i 1) keep drop)))))))))
)

(mat generic-hashtable
  (begin
    (define $ght-keys1 '#(a b c d e f g))
    (define $ght-vals1 '#(1 3 5 7 9 11 13))
    (define $ght (make-hashtable equal-hash equal? 8))
    (vector-for-each
      (lambda (x i) (hashtable-set! $ght x i))
      $ght-keys1
      $ght-vals1)
    (hashtable? $ght))
  (not (eq-hashtable? $ght))
  (eq? (hashtable-hash-function $ght) equal-hash)
  (eq? (hashtable-equivalence-function $ght) equal?)
  (eq? (hashtable-mutable? $ght) #t)
  (not (hashtable-weak? $ght))
  (eqv? (hashtable-size $ght) (vector-length $ght-keys1))
  (eqv? (#%$hashtable-veclen $ght) 8)
  (same-elements? (hashtable-keys $ght) $ght-keys1)
  (same-elements? (hashtable-values $ght) $ght-vals1)
  (equal-entries? (hashtable-entries $ght) $ght-keys1 $ght-vals1)
  (begin
    (define $ght-keys2 '#((a . b) (1 . 2) 3/4 3.4 3.5 1e23 #e1e50 1+1i 3+3.2i -15 #e1e-50 #1=(a . #1#) (#2=(#2# b c))))
    (define $ght-vals2 '#(a b c d e f g h i j k l m))
    (vector-for-each
      (lambda (x i) (hashtable-set! $ght x i))
      $ght-keys2
      $ght-vals2)
    (eq? (hashtable-size $ght) (+ (vector-length $ght-keys1) (vector-length $ght-keys2))))
  (> (#%$hashtable-veclen $ght) 8)
  (same-elements? (hashtable-keys $ght) ($vector-append $ght-keys1 $ght-keys2))
  (same-elements? (hashtable-values $ght) ($vector-append $ght-vals1 $ght-vals2))
  (equal-entries? (hashtable-entries $ght) ($vector-append $ght-keys1 $ght-keys2) ($vector-append $ght-vals1 $ght-vals2))
  #;(same-elements?
    (list->vector (hashtable-map $ght cons))
    (vector-map cons ($vector-append $ght-keys1 $ght-keys2) ($vector-append $ght-vals1 $ght-vals2)))
  #;(same-elements?
    (let ([v (make-vector (+ (vector-length $ght-keys1) (vector-length $ght-keys2)))] [i 0])
      (hashtable-for-each $ght (lambda (key val) (vector-set! v i (cons key val)) (set! i (fx+ i 1))))
      v)
    (vector-map cons ($vector-append $ght-keys1 $ght-keys2) ($vector-append $ght-vals1 $ght-vals2)))
  #;(same-elements?
    (let ([v (make-vector (+ (vector-length $ght-keys1) (vector-length $ght-keys2)))] [i 0])
      (hashtable-for-each-cell $ght (lambda (a) (vector-set! v i a) (set! i (fx+ i 1))))
      v)
    (vector-map cons ($vector-append $ght-keys1 $ght-keys2) ($vector-append $ght-vals1 $ght-vals2)))
  ($vector-andmap
    (lambda (k v) (equal? (hashtable-ref $ght k #f) v))
    $ght-keys1
    $ght-vals1)
  ($vector-andmap
    (lambda (k v) (equal? (hashtable-ref $ght k #f) v))
    $ght-keys2
    $ght-vals2)
  ($vector-andmap
    (lambda (k v) (equal? (hashtable-ref $ght k #f) v))
    '#((a . b) (1 . 2) 3/4 3.4 3.5 1e23 #e1e50 1+1i 3+3.2i -15 #e1e-50 #3=(a . #3#) (#4=(#4# b c)))
    $ght-vals2)
  ($vector-andmap
    (lambda (k) (hashtable-contains? $ght k))
    $ght-keys1)
  ($vector-andmap
    (lambda (k) (hashtable-contains? $ght k))
    $ght-keys2)
  (not (hashtable-contains? $ght '(not a key)))
  (eq? (hashtable-ref $ght '(not a key) 'not-a-key) 'not-a-key)
  (begin
    (define $ght2 (hashtable-copy $ght))
    (and (hashtable? $ght2)
         (not (hashtable-mutable? $ght2))
         (not (hashtable-weak? $ght2))))
  (eq? (hashtable-hash-function $ght) equal-hash)
  (eq? (hashtable-equivalence-function $ght) equal?)
  (begin
    (define $ght3 (hashtable-copy $ght #t))
    (and (hashtable? $ght3)
         (hashtable-mutable? $ght3)
         (not (hashtable-weak? $ght3))))
  (eq? (hashtable-hash-function $ght) equal-hash)
  (eq? (hashtable-equivalence-function $ght) equal?)
  (begin
    (vector-for-each
      (lambda (k) (hashtable-delete! $ght k))
      $ght-keys1)
    #t)
  (same-elements? (hashtable-keys $ght) $ght-keys2)
  (same-elements? (hashtable-values $ght) $ght-vals2)
  (equal-entries? (hashtable-entries $ght) $ght-keys2 $ght-vals2)
  (eqv? (hashtable-size $ght) (vector-length $ght-keys2))
  (begin
    (vector-for-each
      (lambda (k) (hashtable-delete! $ght k))
      $ght-keys2)
    #t)
  (same-elements? (hashtable-keys $ght) '#())
  (same-elements? (hashtable-values $ght) '#())
  (equal-entries? (hashtable-entries $ght) '#() '#())
  (eqv? (hashtable-size $ght) 0)
  (eqv? (#%$hashtable-veclen $ght) 8)
 ; make sure copies are unaffected by deletions
  (eq? (hashtable-size $ght2) (+ (vector-length $ght-keys1) (vector-length $ght-keys2)))
  (same-elements? (hashtable-keys $ght2) ($vector-append $ght-keys1 $ght-keys2))
  (same-elements? (hashtable-values $ght2) ($vector-append $ght-vals1 $ght-vals2))
  (equal-entries? (hashtable-entries $ght2) ($vector-append $ght-keys1 $ght-keys2) ($vector-append $ght-vals1 $ght-vals2))
  (eq? (hashtable-size $ght3) (+ (vector-length $ght-keys1) (vector-length $ght-keys2)))
  (same-elements? (hashtable-keys $ght3) ($vector-append $ght-keys1 $ght-keys2))
  (same-elements? (hashtable-values $ght3) ($vector-append $ght-vals1 $ght-vals2))
  (equal-entries? (hashtable-entries $ght3) ($vector-append $ght-keys1 $ght-keys2) ($vector-append $ght-vals1 $ght-vals2))
  (begin
    (hashtable-clear! $ght3)
    (and
      (eqv? (hashtable-size $ght3) 0)
      (eqv? (hashtable-size $ght2) (+ (vector-length $ght-keys1) (vector-length $ght-keys2)))))
  (error? ; not mutable
    (hashtable-clear! $ght2))
  (error? ; not mutable
    (hashtable-delete! $ght2 (vector-ref $ght-keys2 0)))
  (error? ; not mutable
    (hashtable-update! $ght2 (vector-ref $ght-keys2 0)
      (lambda (x) (cons x x))
      'oops))
  (error? ; not mutable
    (hashtable-update! $ght2 '(not a key)
      (lambda (x) (cons x x))
      'oops))
  (eqv?
    (hashtable-update! $ght3 '(a . b)
      (lambda (x) (+ x 15))
      17)
    (void))
  (eqv?
    (hashtable-update! $ght3 '(a . b)
      (lambda (x) (+ x 29))
      17)
    (void))
  (eqv?
    (hashtable-update! $ght3 1e23
      (lambda (x) (- x 5))
      19)
    (void))
  (equal?
    (let ([a (hashtable-cell $ght3 '(a . b) 17)])
      (set-cdr! a (+ (cdr a) 100))
      a)
    '((a . b) . 161))
  (equal?
    (let ([a (hashtable-cell $ght3 #vu8(1 2 3) 'bv)])
      (set-cdr! a (cons (cdr a) 'vb))
      a)
    '(#vu8(1 2 3) . (bv . vb)))
  (same-elements? (hashtable-keys $ght3) '#((a . b) 1e23 #vu8(1 2 3)))
  (same-elements? (hashtable-values $ght3) '#(161 14 (bv . vb)))
  (equal-entries? (hashtable-entries $ght3) '#((a . b) 1e23 #vu8(1 2 3)) '#(161 14 (bv . vb)))
  (let () ; carl's test program, with a few additions
    (define cov:prof-hash
      (lambda (V)
        (* (vector-ref V 0) (vector-ref V 1) (vector-ref V 2))))
    (define cov:prof-equal?
      (lambda (V W)
        (let ((rv (and (= (vector-ref V 0) (vector-ref W 0))
                       (= (vector-ref V 1) (vector-ref W 1))
                       (= (vector-ref V 2) (vector-ref W 2)))))
          rv)))
    (define make-random-vector-key
      (lambda ()
        (vector (random 20000) (random 100) (random 1000))))
    (define test-hash
      (lambda (n)
        (let ([ht (make-hashtable cov:prof-hash cov:prof-equal?)])
          (let loop ([i 0])
            (let ([str (make-random-vector-key)])
              (hashtable-set! ht str i)
              (hashtable-update! ht str (lambda (x) (* x 2)) -1)
              (let ([a (hashtable-cell ht str 'a)]) (set-cdr! a (- (cdr a))))
              (cond
                [(= i n) (= (hashtable-size ht) 1000)]
                [(and (hashtable-contains? ht str)
                      (= (hashtable-ref ht str #f) (* i -2)))
                 (when (= (hashtable-size ht) 1000)
                   (hashtable-delete! ht str))
                 (loop (+ i 1))]
                [else (errorf 'test-hash "hashtable failure for key ~s" str)]))))))
    (test-hash 100000))
)

(mat hash-functions
 ; equal-hash
  (error? ; wrong argument count
    (equal-hash))
  (error? ; wrong argument count
    (equal-hash 0 0))
 ; symbol-hash
  (error? ; wrong argument count
    (symbol-hash))
  (error? ; wrong argument count
    (symbol-hash 'a 'a))
  (error? ; not a symbol
    (symbol-hash "hello"))
 ; string-hash
  (error? ; wrong argument count
    (string-hash))
  (error? ; wrong argument count
    (string-hash 'a 'a))
  (error? ; not a string
    (string-hash 'hello))
 ; string-ci-hash
  (error? ; wrong argument count
    (string-ci-hash))
  (error? ; wrong argument count
    (string-ci-hash 'a 'a))
  (error? ; not a string
    (string-ci-hash 'hello))
  (let ([hc (equal-hash '(a b c))])
    (and (integer? hc)
         (exact? hc)
         (>= hc 0)
         (= (equal-hash '(a b c)) hc)))
  (let ([hc (string-hash "hello")])
    (and (integer? hc)
         (exact? hc)
         (>= hc 0)
         (= (string-hash "hello") hc)))
  (let ([hc (string-ci-hash "hello")])
    (and (integer? hc)
         (exact? hc)
         (>= hc 0)
         (= (string-ci-hash "HelLo") hc)))
  (let f ([ls (oblist)])
    (define okay?
      (lambda (x)
        (let ([hc (symbol-hash x)])
          (and (integer? hc)
               (exact? hc)
               (>= hc 0)
               (= (symbol-hash x) hc)))))
    (and (okay? (car ls))
         (let g ([ls ls] [n 10])
           (or (null? ls)
               (if (= n 0)
                   (f ls)
                   (g (cdr ls) (- n 1)))))))
 ; adapted from Flatt's r6rs tests for string-ci=?
  (eqv? (string-ci-hash "z") (string-ci-hash "Z"))
  (not (eqv? (string-ci-hash "z") (string-ci-hash "a")))
  (eqv? (string-ci-hash "Stra\xDF;e") (string-ci-hash "Strasse"))
  (eqv? (string-ci-hash "Stra\xDF;e") (string-ci-hash "STRASSE"))
  (eqv? (string-ci-hash "\x39E;\x391;\x39F;\x3A3;") (string-ci-hash "\x3BE;\x3B1;\x3BF;\x3C2;"))
  (eqv? (string-ci-hash "\x39E;\x391;\x39F;\x3A3;") (string-ci-hash "\x3BE;\x3B1;\x3BF;\x3C3;"))
)

(mat fasl-eq-hashtable
 ; fasling out eq hash tables
  (equal?
    (let ([x (cons 'y '!)])
      (define ht (make-eq-hashtable))
      (eq-hashtable-set! ht x 'because)
      (eq-hashtable-set! ht 'foo "foo")
      (let ([p (open-file-output-port "testfile.ss" (file-options replace))])
        (fasl-write (list x ht) p)
        (close-port p))
      (let-values ([(x2 ht2)
                    (apply values
                      (call-with-port
                        (open-file-input-port "testfile.ss")
                        fasl-read))])
        (list
          (eq-hashtable-ref ht2 x2 #f)
          (eq-hashtable-ref ht2 'foo #f))))
    '(because "foo"))
 ; fasling out weak eq hash table
  (equal?
    (with-interrupts-disabled
      (let ([x (cons 'y '!)])
        (define ht (make-weak-eq-hashtable))
        (eq-hashtable-set! ht x 'because)
        (eq-hashtable-set! ht 'foo "foo")
        (let ([p (open-file-output-port "testfile.ss" (file-options replace))])
          (fasl-write (list x ht) p)
          (close-port p))
        (let-values ([(x2 ht2)
                      (apply values
                        (call-with-port
                          (open-file-input-port "testfile.ss")
                          fasl-read))])
          (list
            (eq-hashtable-ref ht2 x2 #f)
            (eq-hashtable-ref ht2 'foo #f)))))
    '(because "foo"))
  (equal?
    (let ([ht2 (cadr (call-with-port
                       (open-file-input-port "testfile.ss")
                       fasl-read))])
      (collect (collect-maximum-generation))
      (list
        (hashtable-keys ht2)
        (eq-hashtable-ref ht2 'foo #f)))
    '(#(foo) "foo"))
 ; fasling eq hash tables via compile-file
  (begin
    (with-output-to-file "testfile.ss"
      (lambda ()
        (pretty-print
          '(begin
             (define-syntax $feh-ls
               (let ([ls '(1 2 3)])
                 (lambda (x)
                   #`(quote #,(datum->syntax #'* ls)))))
             (define $feh-ht
               (let ()
                 (define-syntax a
                   (let ([ht (make-eq-hashtable)])
                     (eq-hashtable-set! ht 'q 'p)
                     (eq-hashtable-set! ht $feh-ls (cdr $feh-ls))
                     (eq-hashtable-set! ht (cdr $feh-ls) (cddr $feh-ls))
                     (eq-hashtable-set! ht (cddr $feh-ls) $feh-ls)
                     (lambda (x) #`(quote #,(datum->syntax #'* ht)))))
                 a)))))
      'replace)
    (compile-file "testfile")
    (load "testfile.so")
    #t)
  (eq? (eq-hashtable-ref $feh-ht 'q #f) 'p)
  (eq? (eq-hashtable-ref $feh-ht $feh-ls #f) (cdr $feh-ls))
  (eq? (eq-hashtable-ref $feh-ht (cdr $feh-ls) #f) (cddr $feh-ls))
  (eq? (eq-hashtable-ref $feh-ht (cddr $feh-ls) #f) $feh-ls)
  (begin
    (eq-hashtable-set! $feh-ht 'p 'r)
    #t)
  (eq? (eq-hashtable-ref $feh-ht 'p #f) 'r)
  (begin
    (eq-hashtable-set! $feh-ht 'q 'not-p)
    #t)
  (eq? (eq-hashtable-ref $feh-ht 'q #f) 'not-p)
)

(mat fasl-symbol-hashtable
 ; fasling out symbol hash tables
  (equal?
    (let ()
      (define ht (make-hashtable symbol-hash eq?))
      (symbol-hashtable-set! ht 'why? 'because)
      (symbol-hashtable-set! ht 'foo "foo")
      (let ([p (open-file-output-port "testfile.ss" (file-options replace))])
        (fasl-write ht p)
        (close-port p))
      (let ([ht2 (call-with-port (open-file-input-port "testfile.ss") fasl-read)])
        (list
          (symbol-hashtable-ref ht2 'why? #f)
          (symbol-hashtable-ref ht2 'foo #f))))
    '(because "foo"))
  (#%$fasl-file-equal? "testfile.ss" "testfile.ss")
  (eqv? (strip-fasl-file "testfile.ss" "testfile1.ss" (fasl-strip-options)) (void))
  (#%$fasl-file-equal? "testfile.ss" "testfile1.ss")
  (equal?
    (let ([ht2 (call-with-port (open-file-input-port "testfile1.ss" (file-options compressed)) fasl-read)])
      (list
        (symbol-hashtable-ref ht2 'why? #f)
        (symbol-hashtable-ref ht2 'foo #f)))
    '(because "foo"))
  (begin
    (call-with-port (open-file-output-port "testfile1.ss" (file-options replace))
      (lambda (p)
        (fasl-write (call-with-port (open-file-input-port "testfile.ss") fasl-read) p)))
    #t)
  (#%$fasl-file-equal? "testfile.ss" "testfile1.ss")
  (#%$fasl-file-equal? "testfile1.ss" "testfile.ss")
  (begin
    (call-with-port (open-file-output-port "testfile1.ss" (file-options replace))
      (lambda (p)
        (let ([ht (call-with-port (open-file-input-port "testfile.ss") fasl-read)])
          (symbol-hashtable-set! ht 'why? 'why-not?)
          (fasl-write ht p))))
    #t)
  (not (#%$fasl-file-equal? "testfile.ss" "testfile1.ss"))
  (not (#%$fasl-file-equal? "testfile1.ss" "testfile.ss"))
  (begin
    (call-with-port (open-file-output-port "testfile1.ss" (file-options replace))
      (lambda (p)
        (let ([ht (call-with-port (open-file-input-port "testfile.ss") fasl-read)])
          (symbol-hashtable-set! ht (gensym) 'foiled)
          (fasl-write ht p))))
    #t)
  (not (#%$fasl-file-equal? "testfile.ss" "testfile1.ss"))
  (not (#%$fasl-file-equal? "testfile1.ss" "testfile.ss"))

 ; fasling symbol hash tables via compile-file
  (begin
    (with-output-to-file "testfile.ss"
      (lambda ()
        (pretty-print
          '(define $fsh-ht
             (let ()
               (define-syntax a
                 (let ([ht (make-hashtable symbol-hash symbol=?)])
                   (symbol-hashtable-set! ht 'q 'p)
                   (symbol-hashtable-set! ht 'p 's)
                   (let ([g (gensym "hello")])
                     (symbol-hashtable-set! ht g g)
                     (symbol-hashtable-set! ht 'g g))
                   (lambda (x) #`(quote #,(datum->syntax #'* ht)))))
               a))))
      'replace)
    (compile-file "testfile")
    (load "testfile.so")
    #t)
  (eq? (symbol-hashtable-ref $fsh-ht 'q #f) 'p)
  (eq? (symbol-hashtable-ref $fsh-ht 'p #f) 's)
  (let ([g (symbol-hashtable-ref $fsh-ht 'g #f)])
    (eq? (symbol-hashtable-ref $fsh-ht g #f) g))
  (eq? (symbol-hashtable-ref $fsh-ht 'spam #f) #f)
  (begin
    (symbol-hashtable-set! $fsh-ht 'p 'r)
    #t)
  (eq? (symbol-hashtable-ref $fsh-ht 'p #f) 'r)
  (begin
    (symbol-hashtable-set! $fsh-ht 'q 'not-p)
    #t)
  (eq? (symbol-hashtable-ref $fsh-ht 'q #f) 'not-p)
)

(mat fasl-other-hashtable
 ; can't fasl out other kinds of hashtables
  (error?
    (let ([x (cons 'y '!)])
      (define ht (make-eqv-hashtable))
      (hashtable-set! ht x 'because)
      (hashtable-set! ht 'foo "foo")
      (hashtable-set! ht 3.1415 "pi")
      (let ([p (open-file-output-port "testfile.ss" (file-options replace))])
        (with-exception-handler
          (lambda (c) (close-port p) (raise-continuable c))
          (lambda () (fasl-write (list x ht) p))))))
  (error?
    (let ([x (cons 'y '!)])
      (define ht (make-hashtable string-hash string=?))
      (hashtable-set! ht "hello" 'goodbye)
      (let ([p (open-file-output-port "testfile.ss" (file-options replace))])
        (with-exception-handler
          (lambda (c) (close-port p) (raise-continuable c))
          (lambda () (fasl-write (list x ht) p))))))
)

(mat ht
  (begin
    (display-string (separate-eval '(parameterize ([source-directories '("." "../s" "../../s")]) (load "ht.ss"))))
    #t)
)