diff --git a/collects/scribblings/reference/threads.scrbl b/collects/scribblings/reference/threads.scrbl
index b0265a5cd1..883582a449 100644
--- a/collects/scribblings/reference/threads.scrbl
+++ b/collects/scribblings/reference/threads.scrbl
@@ -233,15 +233,16 @@ asynchronous channel.
 @margin-note/ref{See also @secref["async-channel"].}
 
 @defproc[(thread-send [thd thread?] [v any/c] 
-                      [fail-thunk (-> any) 
+                      [fail-thunk (or/c (-> any) false/c)
                                   (lambda () (raise-mismatch-error ....))]) 
          any]{
 
 Queues @scheme[v] as a message to @scheme[thd] without blocking. If
-the message is queued, the result is @|void-const|. If @scheme[thd] is
+the message is queued, the result is @|void-const|. If @scheme[thd]
 stops running---as in @scheme[thread-running?]---before the message is
-queued, then @scheme[fail-thunk] is called (through a tail call) to
-produce the result.}
+queued, then @scheme[fail-thunk] is called (through a tail call) if is
+a procedure to produce the result, or @scheme[#f] is returned if
+@scheme[fail-thunk] is @scheme[#f].}
 
 @defproc[(thread-receive) any/c]{
 
@@ -259,3 +260,9 @@ or returns @scheme[#f] immediately if no message is available.}
 Returns a constant @tech{synchronizable event} (see @secref["sync"])
 that becomes ready when the synchronizing thread has a message to
 receive. The event result is itself.}
+
+@defproc[(thread-rewind-receive [lst list?]) void?]{
+
+Pushes the elements of @scheme[lst] back onto the front of the current
+thread's queue. The elements are pushed one by one, so that the first
+available message is the last element of @scheme[lst].}
diff --git a/collects/tests/mzscheme/sync.ss b/collects/tests/mzscheme/sync.ss
index ce37470a7e..afd819bc25 100644
--- a/collects/tests/mzscheme/sync.ss
+++ b/collects/tests/mzscheme/sync.ss
@@ -702,6 +702,20 @@
             (sync (system-idle-evt))
             (thread-send t 35))))
 (test 35 thread-receive)
+(test #f thread-try-receive)
+(test (void) thread-rewind-receive '(1 2 3))
+(test 3 thread-try-receive)
+(test 2 thread-try-receive)
+(test (void) thread-rewind-receive '(4))
+(test 4 thread-try-receive)
+(test 1 thread-try-receive)
+(test #f thread-try-receive)
+(test (void) thread-rewind-receive (vector->list (make-vector 500 'x)))
+(let loop ([n 500])
+  (unless (zero? n)
+    (test 'x thread-try-receive)
+    (loop (sub1 n))))
+(test #f thread-try-receive)
 (let* ([s #f]
        [t1 (let ([t (current-thread)])
              (thread (lambda ()
diff --git a/collects/tests/mzscheme/testing.ss b/collects/tests/mzscheme/testing.ss
index 3c9f22ea60..79fab3ab39 100644
--- a/collects/tests/mzscheme/testing.ss
+++ b/collects/tests/mzscheme/testing.ss
@@ -306,8 +306,8 @@ transcript.
     (printf "\n~aPerformed ~a expression tests (~a ~a, ~a ~a)\n"
             Section-prefix
             (+ number-of-tests number-of-error-tests)
-            number-of-tests "good expressions"
-            number-of-error-tests "bad expressions")
+            number-of-tests "value expressions"
+            number-of-error-tests "exn expressions")
     (printf "~aand ~a exception field tests.\n\n"
             Section-prefix
             number-of-exn-tests)
diff --git a/src/mzscheme/src/cstartup.inc b/src/mzscheme/src/cstartup.inc
index 85743cde54..229a9f05f9 100644
--- a/src/mzscheme/src/cstartup.inc
+++ b/src/mzscheme/src/cstartup.inc
@@ -1,5 +1,5 @@
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,48,50,0,0,0,1,0,0,6,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,49,50,0,0,0,1,0,0,6,0,
 9,0,14,0,17,0,24,0,31,0,35,0,48,0,55,0,60,0,65,0,69,
 0,78,0,84,0,98,0,112,0,115,0,119,0,121,0,132,0,134,0,148,0,
 155,0,177,0,179,0,193,0,253,0,23,1,32,1,41,1,51,1,68,1,107,
@@ -14,11 +14,11 @@
 117,101,115,61,120,73,108,101,116,114,101,99,45,118,97,108,117,101,115,66,108,
 97,109,98,100,97,1,20,112,97,114,97,109,101,116,101,114,105,122,97,116,105,
 111,110,45,107,101,121,61,118,73,100,101,102,105,110,101,45,118,97,108,117,101,
-115,98,10,34,11,8,164,207,94,159,2,16,34,34,159,2,15,34,34,16,20,
+115,98,10,34,11,8,167,207,94,159,2,16,34,34,159,2,15,34,34,16,20,
 2,3,2,2,2,5,2,2,2,6,2,2,2,7,2,2,2,8,2,2,2,
 9,2,2,2,10,2,2,2,4,2,2,2,11,2,2,2,12,2,2,97,35,
-11,8,164,207,93,159,2,15,34,35,16,2,2,13,161,2,2,35,2,13,2,
-2,2,13,97,10,11,11,8,164,207,16,0,97,10,36,11,8,164,207,16,0,
+11,8,167,207,93,159,2,15,34,35,16,2,2,13,161,2,2,35,2,13,2,
+2,2,13,97,10,11,11,8,167,207,16,0,97,10,36,11,8,167,207,16,0,
 13,16,4,34,29,11,11,2,2,11,18,98,64,104,101,114,101,8,31,8,30,
 8,29,8,28,8,27,27,248,22,180,3,23,196,1,249,22,173,3,80,158,37,
 34,251,22,73,2,17,248,22,88,23,200,2,12,249,22,63,2,1,248,22,90,
@@ -28,14 +28,14 @@
 35,34,35,28,248,22,71,248,22,65,23,195,2,248,22,64,193,249,22,173,3,
 80,158,37,34,251,22,73,2,17,248,22,64,23,200,2,249,22,63,2,12,248,
 22,65,23,202,1,11,18,100,10,8,31,8,30,8,29,8,28,8,27,16,4,
-11,11,2,18,3,1,7,101,110,118,55,51,48,53,16,4,11,11,2,19,3,
-1,7,101,110,118,55,51,48,54,27,248,22,65,248,22,180,3,23,197,1,28,
+11,11,2,18,3,1,7,101,110,118,55,51,49,54,16,4,11,11,2,19,3,
+1,7,101,110,118,55,51,49,55,27,248,22,65,248,22,180,3,23,197,1,28,
 248,22,71,23,194,2,20,15,159,35,34,35,28,248,22,71,248,22,65,23,195,
 2,248,22,64,193,249,22,173,3,80,158,37,34,250,22,73,2,20,248,22,73,
 249,22,73,248,22,73,2,21,248,22,64,23,202,2,251,22,73,2,17,2,21,
 2,21,249,22,63,2,4,248,22,65,23,205,1,18,100,11,8,31,8,30,8,
-29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,51,48,56,
-16,4,11,11,2,19,3,1,7,101,110,118,55,51,48,57,248,22,180,3,193,
+29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,51,49,57,
+16,4,11,11,2,19,3,1,7,101,110,118,55,51,50,48,248,22,180,3,193,
 27,248,22,180,3,194,249,22,63,248,22,73,248,22,64,196,248,22,65,195,27,
 248,22,65,248,22,180,3,23,197,1,249,22,173,3,80,158,37,34,28,248,22,
 51,248,22,174,3,248,22,64,23,198,2,27,249,22,2,32,0,89,162,8,44,
@@ -65,8 +65,8 @@
 65,202,251,22,73,2,17,28,249,22,140,8,248,22,174,3,248,22,64,23,201,
 2,64,101,108,115,101,10,248,22,64,23,198,2,250,22,74,2,20,9,248,22,
 65,23,201,1,249,22,63,2,3,248,22,65,23,203,1,99,8,31,8,30,8,
-29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,51,51,49,
-16,4,11,11,2,19,3,1,7,101,110,118,55,51,51,50,18,158,94,10,64,
+29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,51,52,50,
+16,4,11,11,2,19,3,1,7,101,110,118,55,51,52,51,18,158,94,10,64,
 118,111,105,100,8,47,27,248,22,65,248,22,180,3,196,249,22,173,3,80,158,
 37,34,28,248,22,51,248,22,174,3,248,22,64,197,250,22,73,2,26,248,22,
 73,248,22,64,199,248,22,88,198,27,248,22,174,3,248,22,64,197,250,22,73,
@@ -100,7 +100,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 2046);
   }
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,48,60,0,0,0,1,0,0,3,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,49,60,0,0,0,1,0,0,3,0,
 16,0,21,0,38,0,53,0,71,0,87,0,97,0,115,0,135,0,151,0,169,
 0,200,0,229,0,251,0,9,1,15,1,29,1,34,1,44,1,52,1,80,1,
 112,1,157,1,202,1,226,1,9,2,11,2,68,2,158,3,167,3,208,3,42,
@@ -132,169 +132,169 @@
 103,32,111,114,32,98,121,116,101,32,115,116,114,105,110,103,6,36,36,99,97,
 110,110,111,116,32,97,100,100,32,97,32,115,117,102,102,105,120,32,116,111,32,
 97,32,114,111,111,116,32,112,97,116,104,58,32,5,0,27,20,14,159,80,158,
-35,49,250,80,158,38,50,249,22,27,11,80,158,40,49,22,146,12,10,248,22,
+35,49,250,80,158,38,50,249,22,27,11,80,158,40,49,22,147,12,10,248,22,
 188,4,23,196,2,28,248,22,166,5,23,194,2,12,87,94,248,22,143,8,23,
 194,1,248,80,159,36,53,35,195,28,248,22,71,23,195,2,9,27,248,22,64,
-23,196,2,27,28,248,22,191,12,23,195,2,23,194,1,28,248,22,190,12,23,
-195,2,249,22,128,13,23,196,1,250,80,158,41,47,248,22,142,13,2,20,11,
-10,250,80,158,39,47,248,22,142,13,2,20,23,197,1,10,28,23,193,2,249,
-22,63,248,22,130,13,249,22,128,13,23,198,1,247,22,143,13,27,248,22,65,
+23,196,2,27,28,248,22,128,13,23,195,2,23,194,1,28,248,22,191,12,23,
+195,2,249,22,129,13,23,196,1,250,80,158,41,47,248,22,143,13,2,20,11,
+10,250,80,158,39,47,248,22,143,13,2,20,23,197,1,10,28,23,193,2,249,
+22,63,248,22,131,13,249,22,129,13,23,198,1,247,22,144,13,27,248,22,65,
 23,200,1,28,248,22,71,23,194,2,9,27,248,22,64,23,195,2,27,28,248,
-22,191,12,23,195,2,23,194,1,28,248,22,190,12,23,195,2,249,22,128,13,
-23,196,1,250,80,158,46,47,248,22,142,13,2,20,11,10,250,80,158,44,47,
-248,22,142,13,2,20,23,197,1,10,28,23,193,2,249,22,63,248,22,130,13,
-249,22,128,13,23,198,1,247,22,143,13,248,80,159,44,52,35,248,22,65,23,
+22,128,13,23,195,2,23,194,1,28,248,22,191,12,23,195,2,249,22,129,13,
+23,196,1,250,80,158,46,47,248,22,143,13,2,20,11,10,250,80,158,44,47,
+248,22,143,13,2,20,23,197,1,10,28,23,193,2,249,22,63,248,22,131,13,
+249,22,129,13,23,198,1,247,22,144,13,248,80,159,44,52,35,248,22,65,23,
 199,1,87,94,23,193,1,248,80,159,42,52,35,248,22,65,23,197,1,87,94,
 23,193,1,27,248,22,65,23,198,1,28,248,22,71,23,194,2,9,27,248,22,
-64,23,195,2,27,28,248,22,191,12,23,195,2,23,194,1,28,248,22,190,12,
-23,195,2,249,22,128,13,23,196,1,250,80,158,44,47,248,22,142,13,2,20,
-11,10,250,80,158,42,47,248,22,142,13,2,20,23,197,1,10,28,23,193,2,
-249,22,63,248,22,130,13,249,22,128,13,23,198,1,247,22,143,13,248,80,159,
+64,23,195,2,27,28,248,22,128,13,23,195,2,23,194,1,28,248,22,191,12,
+23,195,2,249,22,129,13,23,196,1,250,80,158,44,47,248,22,143,13,2,20,
+11,10,250,80,158,42,47,248,22,143,13,2,20,23,197,1,10,28,23,193,2,
+249,22,63,248,22,131,13,249,22,129,13,23,198,1,247,22,144,13,248,80,159,
 42,52,35,248,22,65,23,199,1,248,80,159,40,52,35,248,22,65,196,249,80,
-159,36,37,35,2,7,195,27,248,22,167,12,23,195,2,28,23,193,2,192,87,
-94,23,193,1,28,248,22,135,6,23,195,2,27,248,22,189,12,195,28,192,192,
-248,22,190,12,195,11,87,94,28,28,248,22,168,12,23,195,2,10,27,248,22,
-167,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,23,
-196,2,27,248,22,189,12,23,197,2,28,23,193,2,192,87,94,23,193,1,248,
-22,190,12,23,197,2,11,12,250,22,170,8,76,110,111,114,109,97,108,45,112,
+159,36,37,35,2,7,195,27,248,22,168,12,23,195,2,28,23,193,2,192,87,
+94,23,193,1,28,248,22,135,6,23,195,2,27,248,22,190,12,195,28,192,192,
+248,22,191,12,195,11,87,94,28,28,248,22,169,12,23,195,2,10,27,248,22,
+168,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,23,
+196,2,27,248,22,190,12,23,197,2,28,23,193,2,192,87,94,23,193,1,248,
+22,191,12,23,197,2,11,12,250,22,170,8,76,110,111,114,109,97,108,45,112,
 97,116,104,45,99,97,115,101,6,42,42,112,97,116,104,32,40,102,111,114,32,
 97,110,121,32,115,121,115,116,101,109,41,32,111,114,32,118,97,108,105,100,45,
-112,97,116,104,32,115,116,114,105,110,103,23,197,2,28,28,248,22,168,12,23,
-195,2,249,22,140,8,248,22,169,12,23,197,2,2,21,249,22,140,8,247,22,
+112,97,116,104,32,115,116,114,105,110,103,23,197,2,28,28,248,22,169,12,23,
+195,2,249,22,140,8,248,22,170,12,23,197,2,2,21,249,22,140,8,247,22,
 154,7,2,21,27,28,248,22,135,6,23,196,2,23,195,2,248,22,144,7,248,
-22,172,12,23,197,2,28,249,22,155,13,0,21,35,114,120,34,94,91,92,92,
+22,173,12,23,197,2,28,249,22,156,13,0,21,35,114,120,34,94,91,92,92,
 93,91,92,92,93,91,63,93,91,92,92,93,34,23,195,2,28,248,22,135,6,
-195,248,22,175,12,195,194,27,248,22,174,6,23,195,1,249,22,176,12,248,22,
-147,7,250,22,161,13,0,6,35,114,120,34,47,34,28,249,22,155,13,0,22,
+195,248,22,176,12,195,194,27,248,22,174,6,23,195,1,249,22,177,12,248,22,
+147,7,250,22,162,13,0,6,35,114,120,34,47,34,28,249,22,156,13,0,22,
 35,114,120,34,91,47,92,92,93,91,46,32,93,43,91,47,92,92,93,42,36,
-34,23,201,2,23,199,1,250,22,161,13,0,19,35,114,120,34,91,32,46,93,
+34,23,201,2,23,199,1,250,22,162,13,0,19,35,114,120,34,91,32,46,93,
 43,40,91,47,92,92,93,42,41,36,34,23,202,1,6,2,2,92,49,80,158,
-42,35,2,21,28,248,22,135,6,194,248,22,175,12,194,193,87,94,28,27,248,
-22,167,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,
-23,196,2,27,248,22,189,12,23,197,2,28,23,193,2,192,87,94,23,193,1,
-248,22,190,12,23,197,2,11,12,250,22,170,8,23,196,2,2,22,23,197,2,
-28,248,22,189,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,
+42,35,2,21,28,248,22,135,6,194,248,22,176,12,194,193,87,94,28,27,248,
+22,168,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,
+23,196,2,27,248,22,190,12,23,197,2,28,23,193,2,192,87,94,23,193,1,
+248,22,191,12,23,197,2,11,12,250,22,170,8,23,196,2,2,22,23,197,2,
+28,248,22,190,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,
 250,22,183,6,2,23,23,200,1,23,201,1,247,22,23,87,94,28,27,248,22,
-167,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,23,
-196,2,27,248,22,189,12,23,197,2,28,23,193,2,192,87,94,23,193,1,248,
-22,190,12,23,197,2,11,12,250,22,170,8,23,196,2,2,22,23,197,2,28,
-248,22,189,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,250,
+168,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,23,
+196,2,27,248,22,190,12,23,197,2,28,23,193,2,192,87,94,23,193,1,248,
+22,191,12,23,197,2,11,12,250,22,170,8,23,196,2,2,22,23,197,2,28,
+248,22,190,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,250,
 22,183,6,2,23,23,200,1,23,201,1,247,22,23,87,94,87,94,28,27,248,
-22,167,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,
-23,196,2,27,248,22,189,12,23,197,2,28,23,193,2,192,87,94,23,193,1,
-248,22,190,12,23,197,2,11,12,250,22,170,8,195,2,22,23,197,2,28,248,
-22,189,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,250,22,
+22,168,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,
+23,196,2,27,248,22,190,12,23,197,2,28,23,193,2,192,87,94,23,193,1,
+248,22,191,12,23,197,2,11,12,250,22,170,8,195,2,22,23,197,2,28,248,
+22,190,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,250,22,
 183,6,2,23,199,23,201,1,247,22,23,249,22,3,89,162,42,35,48,9,223,
 2,33,35,196,248,22,187,10,249,22,162,10,23,196,1,247,22,23,87,94,87,
 94,249,80,159,36,37,35,2,7,195,249,22,3,80,159,36,51,35,196,251,80,
 159,38,40,35,2,7,32,0,89,162,42,35,43,9,222,33,37,197,198,32,39,
 89,162,42,40,57,65,99,108,111,111,112,222,33,40,28,248,22,71,23,199,2,
 87,94,23,198,1,248,23,196,1,251,22,183,6,2,24,23,199,1,28,248,22,
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@@ -330,7 +330,7 @@
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 247,22,154,7,2,21,6,1,1,59,6,1,1,58,250,22,183,6,6,14,14,
 40,91,94,126,97,93,42,41,126,97,40,46,42,41,23,196,2,23,196,1,89,
 162,8,44,36,46,2,14,223,0,33,50,80,159,34,46,35,83,158,34,16,2,
@@ -342,12 +342,12 @@
     EVAL_ONE_SIZED_STR((char *)expr, 5013);
   }
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,48,8,0,0,0,1,0,0,6,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,49,8,0,0,0,1,0,0,6,0,
 19,0,34,0,48,0,62,0,76,0,111,0,0,0,243,0,0,0,65,113,117,
 111,116,101,29,94,2,1,67,35,37,117,116,105,108,115,11,29,94,2,1,69,
 35,37,110,101,116,119,111,114,107,11,29,94,2,1,68,35,37,112,97,114,97,
 109,122,11,29,94,2,1,68,35,37,101,120,112,111,98,115,11,29,94,2,1,
-68,35,37,107,101,114,110,101,108,11,98,10,34,11,8,166,209,97,159,2,2,
+68,35,37,107,101,114,110,101,108,11,98,10,34,11,8,169,209,97,159,2,2,
 34,34,159,2,3,34,34,159,2,4,34,34,159,2,5,34,34,159,2,6,34,
 34,16,0,159,34,20,102,159,34,16,1,20,24,65,98,101,103,105,110,16,0,
 83,158,40,20,99,137,69,35,37,98,117,105,108,116,105,110,29,11,11,10,10,
@@ -359,202 +359,202 @@
     EVAL_ONE_SIZED_STR((char *)expr, 282);
   }
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,48,52,0,0,0,1,0,0,3,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,50,49,53,0,0,0,1,0,0,3,0,
 14,0,41,0,47,0,60,0,74,0,96,0,122,0,134,0,152,0,172,0,184,
-0,200,0,223,0,3,1,8,1,13,1,18,1,23,1,54,1,58,1,66,1,
-74,1,82,1,185,1,230,1,253,1,32,2,67,2,101,2,111,2,145,2,155,
-2,162,2,68,4,81,4,100,4,219,4,231,4,135,5,149,5,10,6,16,6,
-30,6,57,6,142,6,144,6,205,6,123,12,182,12,214,12,0,0,152,15,0,
-0,29,11,11,70,100,108,108,45,115,117,102,102,105,120,1,25,100,101,102,97,
-117,108,116,45,108,111,97,100,47,117,115,101,45,99,111,109,112,105,108,101,100,
-65,113,117,111,116,101,29,94,2,4,67,35,37,117,116,105,108,115,11,29,94,
-2,4,68,35,37,112,97,114,97,109,122,11,1,20,100,101,102,97,117,108,116,
-45,114,101,97,100,101,114,45,103,117,97,114,100,1,24,45,109,111,100,117,108,
-101,45,104,97,115,104,45,116,97,98,108,101,45,116,97,98,108,101,71,45,112,
-97,116,104,45,99,97,99,104,101,77,45,108,111,97,100,105,110,103,45,102,105,
-108,101,110,97,109,101,79,45,108,111,97,100,105,110,103,45,112,114,111,109,112,
-116,45,116,97,103,71,45,112,114,101,118,45,114,101,108,116,111,75,45,112,114,
-101,118,45,114,101,108,116,111,45,100,105,114,1,21,115,112,108,105,116,45,114,
-101,108,97,116,105,118,101,45,115,116,114,105,110,103,1,34,109,97,107,101,45,
-115,116,97,110,100,97,114,100,45,109,111,100,117,108,101,45,110,97,109,101,45,
-114,101,115,111,108,118,101,114,64,98,111,111,116,64,115,97,109,101,64,119,101,
-97,107,64,108,111,111,112,1,29,115,116,97,110,100,97,114,100,45,109,111,100,
-117,108,101,45,110,97,109,101,45,114,101,115,111,108,118,101,114,63,108,105,98,
-67,105,103,110,111,114,101,100,249,22,14,195,80,158,36,44,249,80,159,36,47,
-35,195,10,27,28,23,195,2,28,249,22,140,8,23,197,2,80,158,37,45,87,
-94,23,195,1,80,158,35,46,27,248,22,151,4,23,197,2,28,248,22,167,12,
-23,194,2,91,159,37,11,90,161,37,34,11,248,22,188,12,23,197,1,87,95,
-83,160,36,11,80,158,39,45,198,83,160,36,11,80,158,39,46,192,192,11,11,
-28,23,193,2,192,87,94,23,193,1,27,247,22,187,5,28,192,192,247,22,143,
-13,20,14,159,80,158,34,38,250,80,158,37,39,249,22,27,11,80,158,39,38,
-22,187,5,28,248,22,167,12,23,198,2,23,197,1,87,94,23,197,1,247,22,
-143,13,247,194,250,22,185,12,23,197,1,23,199,1,249,80,158,41,37,23,198,
-1,5,3,46,122,111,252,22,185,12,23,199,1,23,201,1,6,6,6,110,97,
-116,105,118,101,247,22,155,7,249,80,158,43,37,23,200,1,80,158,43,34,87,
-94,23,194,1,27,23,194,1,27,250,22,138,13,196,11,32,0,89,162,8,44,
-34,39,9,222,11,28,192,249,22,63,195,194,11,27,248,23,195,1,23,196,1,
-27,250,22,138,13,196,11,32,0,89,162,8,44,34,39,9,222,11,28,192,249,
-22,63,195,194,11,249,247,22,148,13,248,22,64,195,195,27,248,23,195,1,23,
-196,1,27,250,22,138,13,196,11,32,0,89,162,8,44,34,39,9,222,11,28,
-192,249,22,63,195,194,11,249,247,22,185,5,248,22,64,195,195,249,247,22,185,
-5,194,195,87,94,28,248,80,158,35,36,23,195,2,12,250,22,170,8,77,108,
-111,97,100,47,117,115,101,45,99,111,109,112,105,108,101,100,6,25,25,112,97,
-116,104,32,111,114,32,118,97,108,105,100,45,112,97,116,104,32,115,116,114,105,
-110,103,23,197,2,91,159,40,11,90,161,35,34,11,28,248,22,191,12,23,201,
-2,23,200,1,27,247,22,187,5,28,23,193,2,249,22,128,13,23,203,1,23,
-195,1,200,90,161,37,35,11,248,22,188,12,23,194,2,87,94,23,196,1,90,
-161,35,38,11,28,249,22,140,8,23,196,2,68,114,101,108,97,116,105,118,101,
-87,94,23,194,1,2,17,23,194,1,90,161,35,39,11,247,22,145,13,27,89,
-162,42,35,48,62,122,111,225,7,5,3,33,27,27,83,158,38,20,96,94,89,
-162,42,35,50,9,225,8,6,4,33,28,23,197,1,27,249,22,5,89,162,8,
-44,35,46,9,223,5,33,29,23,203,2,27,28,23,195,2,27,249,22,5,83,
-158,38,20,96,94,89,162,8,44,35,46,9,223,5,33,30,23,198,1,23,205,
-2,27,28,23,196,2,11,193,28,192,192,28,193,28,23,196,2,28,249,22,149,
-3,248,22,65,196,248,22,65,23,199,2,193,11,11,11,87,94,23,195,1,11,
-28,23,193,2,249,80,159,46,53,35,202,89,162,42,34,44,9,224,14,2,33,
-31,87,94,23,193,1,27,28,23,197,2,27,249,22,5,83,158,38,20,96,94,
-89,162,8,44,35,46,9,223,7,33,32,23,200,1,23,206,1,27,28,196,11,
-193,28,192,192,28,193,28,196,28,249,22,149,3,248,22,65,196,248,22,65,199,
-193,11,11,11,11,28,192,249,80,159,47,53,35,203,89,162,42,34,44,9,224,
-15,2,33,33,249,80,159,47,53,35,203,89,162,42,34,43,9,224,15,7,33,
-34,32,36,89,162,8,44,35,53,2,19,222,33,38,0,17,35,114,120,34,94,
-40,46,42,63,41,47,40,46,42,41,36,34,27,249,22,153,13,2,37,23,196,
-2,28,23,193,2,87,94,23,194,1,249,22,63,248,22,88,23,196,2,27,248,
-22,97,23,197,1,27,249,22,153,13,2,37,23,196,2,28,23,193,2,87,94,
-23,194,1,249,22,63,248,22,88,23,196,2,27,248,22,97,23,197,1,27,249,
-22,153,13,2,37,23,196,2,28,23,193,2,87,94,23,194,1,249,22,63,248,
-22,88,23,196,2,248,2,36,248,22,97,23,197,1,248,22,73,194,248,22,73,
-194,248,22,73,194,32,39,89,162,42,35,53,2,19,222,33,40,28,248,22,71,
-248,22,65,23,195,2,249,22,7,9,248,22,64,195,91,159,36,11,90,161,36,
-34,11,27,248,22,65,23,197,2,28,248,22,71,248,22,65,23,195,2,249,22,
-7,9,248,22,64,23,196,1,91,159,36,11,90,161,36,34,11,27,248,22,65,
-23,197,2,28,248,22,71,248,22,65,23,195,2,249,22,7,9,248,22,64,23,
-196,1,91,159,36,11,90,161,36,34,11,248,2,39,248,22,65,23,197,2,249,
-22,7,249,22,63,248,22,64,23,200,1,23,197,1,23,196,1,249,22,7,249,
-22,63,248,22,64,23,200,1,23,197,1,23,196,1,249,22,7,249,22,63,248,
-22,64,23,200,1,23,197,1,195,27,248,2,36,23,195,1,28,194,192,248,2,
-39,193,87,95,28,248,22,149,4,195,12,250,22,170,8,2,20,6,20,20,114,
-101,115,111,108,118,101,100,45,109,111,100,117,108,101,45,112,97,116,104,197,28,
-24,193,2,248,24,194,1,195,87,94,23,193,1,12,27,27,250,22,126,80,158,
-40,41,248,22,171,13,247,22,151,11,11,28,23,193,2,192,87,94,23,193,1,
-27,247,22,120,87,94,250,22,125,80,158,41,41,248,22,171,13,247,22,151,11,
-195,192,250,22,125,195,198,66,97,116,116,97,99,104,251,211,197,198,199,10,28,
-192,250,22,169,8,11,196,195,248,22,167,8,194,28,249,22,141,6,194,6,1,
-1,46,2,17,28,249,22,141,6,194,6,2,2,46,46,62,117,112,192,28,249,
-22,142,8,248,22,65,23,200,2,23,197,1,28,249,22,140,8,248,22,64,23,
-200,2,23,196,1,251,22,167,8,2,20,6,26,26,99,121,99,108,101,32,105,
-110,32,108,111,97,100,105,110,103,32,97,116,32,126,101,58,32,126,101,23,200,
-1,249,22,2,22,65,248,22,78,249,22,63,23,206,1,23,202,1,12,12,247,
-192,20,14,159,80,158,38,43,249,22,63,247,22,151,11,23,197,1,20,14,159,
-80,158,38,38,250,80,158,41,39,249,22,27,11,80,158,43,38,22,133,4,23,
-196,1,249,247,22,186,5,23,198,1,248,22,52,248,22,171,12,23,198,1,87,
-94,28,28,248,22,167,12,23,197,2,10,248,22,154,4,23,197,2,12,28,23,
-198,2,250,22,169,8,11,6,15,15,98,97,100,32,109,111,100,117,108,101,32,
-112,97,116,104,23,201,2,250,22,170,8,2,20,6,19,19,109,111,100,117,108,
-101,45,112,97,116,104,32,111,114,32,112,97,116,104,23,199,2,28,28,248,22,
-61,23,197,2,249,22,140,8,248,22,64,23,199,2,2,4,11,248,22,150,4,
-248,22,88,197,28,28,248,22,61,23,197,2,249,22,140,8,248,22,64,23,199,
-2,66,112,108,97,110,101,116,11,87,94,28,207,12,20,14,159,80,158,36,38,
-250,80,158,39,39,249,22,27,11,80,158,41,38,22,151,11,23,197,1,90,161,
-35,34,10,249,22,134,4,21,94,2,21,6,18,18,112,108,97,110,101,116,47,
-114,101,115,111,108,118,101,114,46,115,115,1,27,112,108,97,110,101,116,45,109,
-111,100,117,108,101,45,110,97,109,101,45,114,101,115,111,108,118,101,114,12,251,
-211,199,200,201,202,87,94,23,193,1,27,89,162,42,35,44,79,115,104,111,119,
-45,99,111,108,108,101,99,116,105,111,110,45,101,114,114,223,6,33,44,27,28,
-248,22,51,23,199,2,27,250,22,126,80,158,42,42,249,22,63,23,204,2,247,
-22,144,13,11,28,23,193,2,192,87,94,23,193,1,91,159,36,11,90,161,36,
-34,11,249,80,159,43,47,35,248,22,54,23,204,2,11,27,251,80,158,46,49,
-2,20,23,202,1,28,248,22,71,23,199,2,23,199,2,248,22,64,23,199,2,
-28,248,22,71,23,199,2,9,248,22,65,23,199,2,249,22,185,12,23,195,1,
+0,200,0,223,0,3,1,8,1,13,1,18,1,23,1,28,1,59,1,63,1,
+71,1,79,1,87,1,190,1,235,1,255,1,34,2,69,2,103,2,113,2,160,
+2,170,2,177,2,76,4,89,4,108,4,227,4,239,4,143,5,157,5,18,6,
+24,6,38,6,65,6,150,6,152,6,213,6,131,12,190,12,222,12,0,0,160,
+15,0,0,29,11,11,70,100,108,108,45,115,117,102,102,105,120,1,25,100,101,
+102,97,117,108,116,45,108,111,97,100,47,117,115,101,45,99,111,109,112,105,108,
+101,100,65,113,117,111,116,101,29,94,2,4,67,35,37,117,116,105,108,115,11,
+29,94,2,4,68,35,37,112,97,114,97,109,122,11,1,20,100,101,102,97,117,
+108,116,45,114,101,97,100,101,114,45,103,117,97,114,100,1,24,45,109,111,100,
+117,108,101,45,104,97,115,104,45,116,97,98,108,101,45,116,97,98,108,101,71,
+45,112,97,116,104,45,99,97,99,104,101,77,45,108,111,97,100,105,110,103,45,
+102,105,108,101,110,97,109,101,79,45,108,111,97,100,105,110,103,45,112,114,111,
+109,112,116,45,116,97,103,71,45,112,114,101,118,45,114,101,108,116,111,75,45,
+112,114,101,118,45,114,101,108,116,111,45,100,105,114,1,21,115,112,108,105,116,
+45,114,101,108,97,116,105,118,101,45,115,116,114,105,110,103,1,34,109,97,107,
+101,45,115,116,97,110,100,97,114,100,45,109,111,100,117,108,101,45,110,97,109,
+101,45,114,101,115,111,108,118,101,114,64,98,111,111,116,64,115,97,109,101,5,
+3,46,122,111,64,119,101,97,107,64,108,111,111,112,1,29,115,116,97,110,100,
+97,114,100,45,109,111,100,117,108,101,45,110,97,109,101,45,114,101,115,111,108,
+118,101,114,63,108,105,98,67,105,103,110,111,114,101,100,249,22,14,195,80,158,
+36,44,249,80,159,36,47,35,195,10,27,28,23,195,2,28,249,22,140,8,23,
+197,2,80,158,37,45,87,94,23,195,1,80,158,35,46,27,248,22,151,4,23,
+197,2,28,248,22,168,12,23,194,2,91,159,37,11,90,161,37,34,11,248,22,
+189,12,23,197,1,87,95,83,160,36,11,80,158,39,45,198,83,160,36,11,80,
+158,39,46,192,192,11,11,28,23,193,2,192,87,94,23,193,1,27,247,22,187,
+5,28,192,192,247,22,144,13,20,14,159,80,158,34,38,250,80,158,37,39,249,
+22,27,11,80,158,39,38,22,187,5,28,248,22,168,12,23,198,2,23,197,1,
+87,94,23,197,1,247,22,144,13,247,194,250,22,186,12,23,197,1,23,199,1,
+249,80,158,41,37,23,198,1,2,18,252,22,186,12,23,199,1,23,201,1,6,
+6,6,110,97,116,105,118,101,247,22,155,7,249,80,158,43,37,23,200,1,80,
+158,43,34,87,94,23,194,1,27,23,194,1,27,250,22,139,13,196,11,32,0,
+89,162,8,44,34,39,9,222,11,28,192,249,22,63,195,194,11,27,248,23,195,
+1,23,196,1,27,250,22,139,13,196,11,32,0,89,162,8,44,34,39,9,222,
+11,28,192,249,22,63,195,194,11,249,247,22,149,13,248,22,64,195,195,27,250,
+22,186,12,23,198,1,23,200,1,249,80,158,42,37,23,199,1,2,18,27,250,
+22,139,13,196,11,32,0,89,162,8,44,34,39,9,222,11,28,192,249,22,63,
+195,194,11,249,247,22,185,5,248,22,64,195,195,249,247,22,185,5,194,195,87,
+94,28,248,80,158,35,36,23,195,2,12,250,22,170,8,77,108,111,97,100,47,
+117,115,101,45,99,111,109,112,105,108,101,100,6,25,25,112,97,116,104,32,111,
+114,32,118,97,108,105,100,45,112,97,116,104,32,115,116,114,105,110,103,23,197,
+2,91,159,40,11,90,161,35,34,11,28,248,22,128,13,23,201,2,23,200,1,
+27,247,22,187,5,28,23,193,2,249,22,129,13,23,203,1,23,195,1,200,90,
+161,37,35,11,248,22,189,12,23,194,2,87,94,23,196,1,90,161,35,38,11,
+28,249,22,140,8,23,196,2,68,114,101,108,97,116,105,118,101,87,94,23,194,
+1,2,17,23,194,1,90,161,35,39,11,247,22,146,13,27,89,162,42,35,48,
+62,122,111,225,7,5,3,33,28,27,89,162,42,35,50,9,225,8,6,4,33,
+29,27,249,22,5,89,162,8,44,35,46,9,223,5,33,30,23,203,2,27,28,
+23,195,2,27,249,22,5,83,158,38,20,96,94,89,162,8,44,35,46,9,223,
+5,33,31,23,198,1,23,205,2,27,28,23,196,2,11,193,28,192,192,28,193,
+28,23,196,2,28,249,22,149,3,248,22,65,196,248,22,65,23,199,2,193,11,
+11,11,87,94,23,195,1,11,28,23,193,2,249,80,159,46,53,35,202,89,162,
+42,34,44,9,224,14,2,33,32,87,94,23,193,1,27,28,23,197,1,27,249,
+22,5,83,158,38,20,96,94,89,162,8,44,35,49,9,225,14,12,10,33,33,
+23,203,1,23,206,1,27,28,196,11,193,28,192,192,28,193,28,196,28,249,22,
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+11,195,192,87,95,28,23,209,1,27,250,22,126,23,197,2,197,11,28,23,193,
+1,12,87,95,27,27,28,248,22,17,80,158,50,44,80,158,49,44,247,22,19,
+250,22,25,248,22,23,23,197,2,80,158,52,43,23,196,1,27,247,22,151,11,
+249,22,3,83,158,38,20,96,94,89,162,8,44,35,53,9,226,12,11,2,3,
+33,47,23,195,1,23,196,1,248,28,248,22,17,80,158,49,44,32,0,89,162,
+42,35,40,9,222,33,48,80,159,48,56,35,89,162,42,34,49,9,227,14,9,
+8,4,3,33,49,250,22,125,23,197,1,197,10,12,28,28,248,22,157,7,23,
+202,1,11,27,248,22,135,6,23,208,2,28,192,192,28,248,22,61,23,208,2,
+249,22,140,8,248,22,64,23,210,2,2,22,11,250,22,125,80,158,49,42,28,
+248,22,135,6,23,210,2,249,22,63,23,211,1,248,80,159,52,54,35,23,213,
+1,87,94,23,210,1,249,22,63,23,211,1,247,22,145,13,252,22,159,7,23,
+208,1,23,207,1,23,205,1,23,203,1,201,12,193,91,159,36,10,90,161,35,
+34,10,11,90,161,35,35,10,83,158,37,20,95,96,2,21,89,162,8,44,35,
+49,9,224,2,0,33,43,89,162,42,37,47,9,223,1,33,44,89,162,42,38,
+8,30,9,225,2,3,0,33,50,208,87,95,248,22,132,4,248,80,158,36,48,
+247,22,151,11,248,22,186,5,80,158,35,35,248,22,142,12,80,159,35,40,35,
+159,34,20,102,159,34,16,1,20,24,65,98,101,103,105,110,16,0,83,158,40,
+20,99,137,66,35,37,98,111,111,116,2,1,11,10,10,36,80,158,34,34,20,
+102,159,38,16,19,30,2,1,2,2,193,30,2,1,2,3,193,30,2,5,72,
+112,97,116,104,45,115,116,114,105,110,103,63,10,30,2,5,75,112,97,116,104,
+45,97,100,100,45,115,117,102,102,105,120,7,30,2,6,1,20,112,97,114,97,
+109,101,116,101,114,105,122,97,116,105,111,110,45,107,101,121,4,30,2,6,1,
+23,101,120,116,101,110,100,45,112,97,114,97,109,101,116,101,114,105,122,97,116,
+105,111,110,3,30,2,1,2,7,193,30,2,1,2,8,193,30,2,1,2,9,
+193,30,2,1,2,10,193,30,2,1,2,11,193,30,2,1,2,12,193,30,2,
+1,2,13,193,30,2,1,2,14,193,30,2,1,2,15,193,30,2,5,69,45,
+102,105,110,100,45,99,111,108,0,30,2,5,76,110,111,114,109,97,108,45,99,
+97,115,101,45,112,97,116,104,6,30,2,5,79,112,97,116,104,45,114,101,112,
+108,97,99,101,45,115,117,102,102,105,120,9,30,2,1,2,16,193,16,0,11,
+11,16,11,2,10,2,11,2,8,2,9,2,12,2,13,2,3,2,7,2,2,
+2,15,2,14,45,11,37,34,11,16,1,9,16,1,2,16,16,1,11,16,1,
+2,16,35,35,35,11,11,16,0,16,0,16,0,34,34,11,11,11,16,0,16,
+0,16,0,34,34,16,0,16,16,83,158,34,16,2,89,162,42,35,43,9,223,
+0,33,24,80,159,34,56,35,83,158,34,16,2,89,162,8,44,35,43,9,223,
+0,33,25,80,159,34,55,35,83,158,34,16,2,89,162,42,35,47,67,103,101,
+116,45,100,105,114,223,0,33,26,80,159,34,54,35,83,158,34,16,2,89,162,
+42,36,47,68,119,105,116,104,45,100,105,114,223,0,33,27,80,159,34,53,35,
+83,158,34,16,2,248,22,154,7,69,115,111,45,115,117,102,102,105,120,80,159,
+34,34,35,83,158,34,16,2,89,162,42,36,58,2,3,223,0,33,36,80,159,
+34,35,35,83,158,34,16,2,32,0,89,162,8,44,35,40,2,7,222,192,80,
+159,34,40,35,83,158,34,16,2,248,22,120,2,19,80,159,34,41,35,83,158,
+34,16,2,249,22,120,2,19,65,101,113,117,97,108,80,159,34,42,35,83,158,
+34,16,2,247,22,59,80,159,34,43,35,83,158,34,16,2,248,22,18,74,109,
+111,100,117,108,101,45,108,111,97,100,105,110,103,80,159,34,44,35,83,158,34,
+16,2,11,80,158,34,45,83,158,34,16,2,11,80,158,34,46,83,158,34,16,
+2,32,0,89,162,42,36,43,2,14,222,33,42,80,159,34,47,35,83,158,34,
+16,2,89,162,8,44,35,43,2,15,223,0,33,51,80,159,34,48,35,83,158,
+34,16,2,89,162,42,34,42,2,16,223,0,33,52,80,159,34,52,35,95,29,
+94,2,4,68,35,37,107,101,114,110,101,108,11,29,94,2,4,69,35,37,109,
+105,110,45,115,116,120,11,2,5,9,9,9,34,0};
+    EVAL_ONE_SIZED_STR((char *)expr, 4129);
   }
diff --git a/src/mzscheme/src/schminc.h b/src/mzscheme/src/schminc.h
index 442d6a4e57..c6e07416a1 100644
--- a/src/mzscheme/src/schminc.h
+++ b/src/mzscheme/src/schminc.h
@@ -13,7 +13,7 @@
 
 #define USE_COMPILED_STARTUP 1
 
-#define EXPECTED_PRIM_COUNT 903
+#define EXPECTED_PRIM_COUNT 904
 
 #ifdef MZSCHEME_SOMETHING_OMITTED
 # undef USE_COMPILED_STARTUP
diff --git a/src/mzscheme/src/schvers.h b/src/mzscheme/src/schvers.h
index 3f75df5f22..e90c219bde 100644
--- a/src/mzscheme/src/schvers.h
+++ b/src/mzscheme/src/schvers.h
@@ -13,12 +13,12 @@
    consistently.)
 */
 
-#define MZSCHEME_VERSION "3.99.0.20"
+#define MZSCHEME_VERSION "3.99.0.21"
 
 #define MZSCHEME_VERSION_X 3
 #define MZSCHEME_VERSION_Y 99
 #define MZSCHEME_VERSION_Z 0
-#define MZSCHEME_VERSION_W 20
+#define MZSCHEME_VERSION_W 21
 
 #define MZSCHEME_VERSION_MAJOR ((MZSCHEME_VERSION_X * 100) + MZSCHEME_VERSION_Y)
 #define MZSCHEME_VERSION_MINOR ((MZSCHEME_VERSION_Z * 1000) + MZSCHEME_VERSION_W)
diff --git a/src/mzscheme/src/sema.c b/src/mzscheme/src/sema.c
index 4b76a2c16c..5388d570f4 100644
--- a/src/mzscheme/src/sema.c
+++ b/src/mzscheme/src/sema.c
@@ -42,6 +42,7 @@ static Scheme_Object *thread_send(int n, Scheme_Object **p);
 static Scheme_Object *thread_receive(int n, Scheme_Object **p);
 static Scheme_Object *thread_try_receive(int n, Scheme_Object **p);
 static Scheme_Object *thread_receive_evt(int n, Scheme_Object **p);
+static Scheme_Object *thread_rewind_receive(int n, Scheme_Object **p);
 
 static Scheme_Object *make_alarm(int n, Scheme_Object **p);
 static Scheme_Object *make_sys_idle(int n, Scheme_Object **p);
@@ -163,7 +164,11 @@ void scheme_init_sema(Scheme_Env *env)
 						      "thread-receive-evt", 
 						      0, 0), 
 			     env);
-
+  scheme_add_global_constant("thread-rewind-receive", 
+			     scheme_make_prim_w_arity(thread_rewind_receive,
+						      "thread-rewind-receive", 
+						      1, 1), 
+			     env);
 
   scheme_add_global_constant("alarm-evt", 
 			     scheme_make_prim_w_arity(make_alarm,
@@ -1043,6 +1048,35 @@ static void mbox_push(Scheme_Thread *p, Scheme_Object *o)
      memory for the queue, first. */
 }
 
+static void mbox_push_front(Scheme_Thread *p, Scheme_Object *lst) 
+{
+  int cnt = -1;
+  Scheme_Object *next, *hd;
+
+  next = lst;
+  while (!SCHEME_NULLP(next)) {
+    /* Push one: */
+    hd = scheme_make_raw_pair(SCHEME_CAR(next), p->mbox_first);
+    if (!p->mbox_first)
+      p->mbox_last = hd;
+    p->mbox_first = hd;
+
+    ++cnt;
+    next = SCHEME_CDR(next);
+
+    if (SCHEME_NULLP(next) || (cnt == 256)) {
+      /* Either done or need to use fuel */
+      if (cnt > -1) {
+        /* do a single post for all messages */
+        ((Scheme_Sema*)p->mbox_sema)->value += cnt;
+        scheme_post_sema(p->mbox_sema);
+      }
+      SCHEME_USE_FUEL(cnt+1); /* might sleep */
+      cnt = -1;
+    }
+  }
+}
+
 static Scheme_Object *mbox_pop( Scheme_Thread *p, int dec)
 {
   /* Assertion: mbox_first != NULL */
@@ -1065,7 +1099,8 @@ static Scheme_Object *thread_send(int argc, Scheme_Object **argv)
     int running;
 
     if (argc > 2) {
-      scheme_check_proc_arity("thread-send", 0, 2, argc, argv);
+      if (!SCHEME_FALSEP(argv[2])) /* redundant, but keeps it fast as possible */
+        scheme_check_proc_arity2("thread-send", 0, 2, argc, argv, 1);
     }
 
     running = ((Scheme_Thread*)argv[0])->running;
@@ -1074,7 +1109,10 @@ static Scheme_Object *thread_send(int argc, Scheme_Object **argv)
       return scheme_void;
     } else {
       if (argc > 2) {
-        return _scheme_tail_apply(argv[2], 0, NULL);
+        if (SCHEME_FALSEP(argv[2]))
+          return scheme_false;
+        else
+          return _scheme_tail_apply(argv[2], 0, NULL);
       } else
         scheme_raise_exn(MZEXN_FAIL_CONTRACT, "thread-send: target thread is not running");
     }
@@ -1138,6 +1176,17 @@ static int thread_recv_ready(Scheme_Object *ch, Scheme_Schedule_Info *sinfo)
   return 0;
 }
 
+static Scheme_Object *thread_rewind_receive(int argc, Scheme_Object **argv)
+{
+  if (scheme_is_list(argv[0])) {
+    mbox_push_front(scheme_current_thread, argv[0]);
+    return scheme_void;
+  } else
+    scheme_wrong_type("thread-rewind", "list", 0, argc, argv);
+
+  return NULL;
+}
+
 /**********************************************************************/
 /*                             alarms                                 */
 /**********************************************************************/