diff --git a/collects/scribblings/reference/cont-marks.scrbl b/collects/scribblings/reference/cont-marks.scrbl
index 6252e64928..54b2cdb18d 100644
--- a/collects/scribblings/reference/cont-marks.scrbl
+++ b/collects/scribblings/reference/cont-marks.scrbl
@@ -115,6 +115,29 @@ Returns the first element of the list that would be returned by
 result can be computed more quickly using
 @scheme[continuation-mark-set-first].}
 
+@defproc[(call-with-immediate-continuation-mark
+          [key-v any/c]
+          [proc (any/c . -> . any)]
+          [default-v any/c #f])
+         any]{
+
+Calls @scheme[proc] with the value associated with @scheme[key-v] in
+the first frame of the current continuation (i.e., a value that would
+be replaced if the call to
+@scheme[call-with-immediate-continuation-mark] were replaced with a
+@scheme[with-continuation-mark] form using @scheme[key-v] as the key
+expression). If no such value exists in the first frame,
+@scheme[default-v] is passed to @scheme[proc]. The @scheme[proc] is
+called in tail position with respect to the
+@scheme[call-with-immediate-continuation-mark] call.
+
+This function could be implemented with a combination of
+@scheme[with-continuation-mark], @scheme[current-continuation-marks],
+and @scheme[continuation-mark-set->list], but
+@scheme[call-with-immediate-continuation-mark] is implemented more
+efficiently; it inspects only the first frame of the current
+continuation.}
+
 @defproc[(continuation-mark-set? [v any/c]) boolean?]{
 Returns @scheme[#t] if @scheme[v] is a mark set created by
 @scheme[continuation-marks] or @scheme[current-continuation-marks],
diff --git a/collects/tests/mzscheme/contmark.ss b/collects/tests/mzscheme/contmark.ss
index 30a7b81d12..8249a8c5c7 100644
--- a/collects/tests/mzscheme/contmark.ss
+++ b/collects/tests/mzscheme/contmark.ss
@@ -688,6 +688,21 @@
 
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
+(test #f call-with-immediate-continuation-mark 'x (lambda (v) v))
+(test 10 call-with-immediate-continuation-mark 'x (lambda (v) v) 10)
+(test 12 'cwicm (with-continuation-mark 'x 12 (call-with-immediate-continuation-mark 'x (lambda (v) v))))
+(test '(#f) 'cwiwcm (with-continuation-mark 'x 12 (list (call-with-immediate-continuation-mark 'x (lambda (v) v)))))
+(test 12 'cwicm (with-continuation-mark 'x 12 
+                  (with-continuation-mark 'y 13
+                    (call-with-immediate-continuation-mark 'x (lambda (v) v)))))
+(test 13 'cwicm (with-continuation-mark 'x 12 
+                  (with-continuation-mark 'y 13
+                    (call-with-immediate-continuation-mark 'y (lambda (v) v)))))
+(test 14 'cwicm (with-continuation-mark 'x 12 
+                  (with-continuation-mark 'y 13
+                    (with-continuation-mark 'x 14
+                      (call-with-immediate-continuation-mark 'x (lambda (v) v))))))
+
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (report-errs)
diff --git a/doc/release-notes/mzscheme/HISTORY.txt b/doc/release-notes/mzscheme/HISTORY.txt
index d91f99babd..2418a038b8 100644
--- a/doc/release-notes/mzscheme/HISTORY.txt
+++ b/doc/release-notes/mzscheme/HISTORY.txt
@@ -1,3 +1,9 @@
+Version 4.1.2.4
+Added call-with-immediate-continuation-mark
+
+Version 4.1.2.3
+Added variable-reference? and empty #%variable-reference form
+
 Version 4.1.2.1
 Extended continuation-marks to work on a thread argument
 
diff --git a/src/mzscheme/src/cstartup.inc b/src/mzscheme/src/cstartup.inc
index 34137ba110..e91cdcf96c 100644
--- a/src/mzscheme/src/cstartup.inc
+++ b/src/mzscheme/src/cstartup.inc
@@ -1,5 +1,5 @@
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,51,50,0,0,0,1,0,0,6,0,9,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,52,50,0,0,0,1,0,0,6,0,9,0,
 13,0,26,0,29,0,34,0,41,0,46,0,51,0,58,0,65,0,69,0,78,
 0,84,0,98,0,112,0,115,0,119,0,121,0,132,0,134,0,148,0,155,0,
 177,0,179,0,193,0,253,0,23,1,32,1,41,1,51,1,68,1,107,1,146,
@@ -14,63 +14,63 @@
 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,
-10,35,11,8,186,227,94,159,2,16,35,35,159,2,15,35,35,16,20,2,3,
+10,35,11,8,188,227,94,159,2,16,35,35,159,2,15,35,35,16,20,2,3,
 2,2,2,4,2,2,2,10,2,2,2,5,2,2,2,6,2,2,2,7,2,
 2,2,8,2,2,2,9,2,2,2,11,2,2,2,12,2,2,97,36,11,8,
-186,227,93,159,2,15,35,36,16,2,2,13,161,2,2,36,2,13,2,2,2,
-13,97,10,11,11,8,186,227,16,0,97,10,37,11,8,186,227,16,0,13,16,
+188,227,93,159,2,15,35,36,16,2,2,13,161,2,2,36,2,13,2,2,2,
+13,97,10,11,11,8,188,227,16,0,97,10,37,11,8,188,227,16,0,13,16,
 4,35,29,11,11,2,2,11,18,98,64,104,101,114,101,8,31,8,30,8,29,
-8,28,8,27,27,248,22,132,4,23,196,1,249,22,189,3,80,158,38,35,251,
-22,73,2,17,248,22,88,23,200,2,12,249,22,63,2,1,248,22,90,23,202,
-1,27,248,22,132,4,23,196,1,249,22,189,3,80,158,38,35,251,22,73,2,
-17,248,22,88,23,200,2,249,22,63,2,1,248,22,90,23,202,1,12,27,248,
-22,65,248,22,132,4,23,197,1,28,248,22,71,23,194,2,20,15,159,36,35,
-36,28,248,22,71,248,22,65,23,195,2,248,22,64,193,249,22,189,3,80,158,
-38,35,251,22,73,2,17,248,22,64,23,200,2,249,22,63,2,12,248,22,65,
+8,28,8,27,27,248,22,133,4,23,196,1,249,22,190,3,80,158,38,35,251,
+22,74,2,17,248,22,89,23,200,2,12,249,22,64,2,1,248,22,91,23,202,
+1,27,248,22,133,4,23,196,1,249,22,190,3,80,158,38,35,251,22,74,2,
+17,248,22,89,23,200,2,249,22,64,2,1,248,22,91,23,202,1,12,27,248,
+22,66,248,22,133,4,23,197,1,28,248,22,72,23,194,2,20,15,159,36,35,
+36,28,248,22,72,248,22,66,23,195,2,248,22,65,193,249,22,190,3,80,158,
+38,35,251,22,74,2,17,248,22,65,23,200,2,249,22,64,2,12,248,22,66,
 23,202,1,11,18,100,10,8,31,8,30,8,29,8,28,8,27,16,4,11,11,
-2,18,3,1,7,101,110,118,57,57,53,54,16,4,11,11,2,19,3,1,7,
-101,110,118,57,57,53,55,27,248,22,65,248,22,132,4,23,197,1,28,248,22,
-71,23,194,2,20,15,159,36,35,36,28,248,22,71,248,22,65,23,195,2,248,
-22,64,193,249,22,189,3,80,158,38,35,250,22,73,2,20,248,22,73,249,22,
-73,248,22,73,2,21,248,22,64,23,202,2,251,22,73,2,17,2,21,2,21,
-249,22,63,2,5,248,22,65,23,205,1,18,100,11,8,31,8,30,8,29,8,
-28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,57,57,53,57,16,4,
-11,11,2,19,3,1,7,101,110,118,57,57,54,48,248,22,132,4,193,27,248,
-22,132,4,194,249,22,63,248,22,73,248,22,64,196,248,22,65,195,27,248,22,
-65,248,22,132,4,23,197,1,249,22,189,3,80,158,38,35,28,248,22,51,248,
-22,190,3,248,22,64,23,198,2,27,249,22,2,32,0,89,162,8,44,36,42,
-9,222,33,39,248,22,132,4,248,22,88,23,200,2,250,22,73,2,22,248,22,
-73,249,22,73,248,22,73,248,22,64,23,204,2,250,22,74,2,23,249,22,2,
-22,64,23,204,2,248,22,90,23,206,2,249,22,63,248,22,64,23,202,1,249,
-22,2,22,88,23,200,1,250,22,74,2,20,249,22,2,32,0,89,162,8,44,
-36,46,9,222,33,40,248,22,132,4,248,22,64,201,248,22,65,198,27,248,22,
-132,4,194,249,22,63,248,22,73,248,22,64,196,248,22,65,195,27,248,22,65,
-248,22,132,4,23,197,1,249,22,189,3,80,158,38,35,250,22,74,2,22,249,
-22,2,32,0,89,162,8,44,36,46,9,222,33,42,248,22,132,4,248,22,64,
-201,248,22,65,198,27,248,22,65,248,22,132,4,196,27,248,22,132,4,248,22,
-64,195,249,22,189,3,80,158,39,35,28,248,22,71,195,250,22,74,2,20,9,
-248,22,65,199,250,22,73,2,3,248,22,73,248,22,64,199,250,22,74,2,6,
-248,22,65,201,248,22,65,202,27,248,22,65,248,22,132,4,23,197,1,27,249,
-22,1,22,77,249,22,2,22,132,4,248,22,132,4,248,22,64,199,249,22,189,
-3,80,158,39,35,251,22,73,1,22,119,105,116,104,45,99,111,110,116,105,110,
-117,97,116,105,111,110,45,109,97,114,107,2,24,250,22,74,1,23,101,120,116,
+2,18,3,1,7,101,110,118,57,57,53,57,16,4,11,11,2,19,3,1,7,
+101,110,118,57,57,54,48,27,248,22,66,248,22,133,4,23,197,1,28,248,22,
+72,23,194,2,20,15,159,36,35,36,28,248,22,72,248,22,66,23,195,2,248,
+22,65,193,249,22,190,3,80,158,38,35,250,22,74,2,20,248,22,74,249,22,
+74,248,22,74,2,21,248,22,65,23,202,2,251,22,74,2,17,2,21,2,21,
+249,22,64,2,5,248,22,66,23,205,1,18,100,11,8,31,8,30,8,29,8,
+28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,57,57,54,50,16,4,
+11,11,2,19,3,1,7,101,110,118,57,57,54,51,248,22,133,4,193,27,248,
+22,133,4,194,249,22,64,248,22,74,248,22,65,196,248,22,66,195,27,248,22,
+66,248,22,133,4,23,197,1,249,22,190,3,80,158,38,35,28,248,22,52,248,
+22,191,3,248,22,65,23,198,2,27,249,22,2,32,0,89,162,8,44,36,42,
+9,222,33,39,248,22,133,4,248,22,89,23,200,2,250,22,74,2,22,248,22,
+74,249,22,74,248,22,74,248,22,65,23,204,2,250,22,75,2,23,249,22,2,
+22,65,23,204,2,248,22,91,23,206,2,249,22,64,248,22,65,23,202,1,249,
+22,2,22,89,23,200,1,250,22,75,2,20,249,22,2,32,0,89,162,8,44,
+36,46,9,222,33,40,248,22,133,4,248,22,65,201,248,22,66,198,27,248,22,
+133,4,194,249,22,64,248,22,74,248,22,65,196,248,22,66,195,27,248,22,66,
+248,22,133,4,23,197,1,249,22,190,3,80,158,38,35,250,22,75,2,22,249,
+22,2,32,0,89,162,8,44,36,46,9,222,33,42,248,22,133,4,248,22,65,
+201,248,22,66,198,27,248,22,66,248,22,133,4,196,27,248,22,133,4,248,22,
+65,195,249,22,190,3,80,158,39,35,28,248,22,72,195,250,22,75,2,20,9,
+248,22,66,199,250,22,74,2,3,248,22,74,248,22,65,199,250,22,75,2,6,
+248,22,66,201,248,22,66,202,27,248,22,66,248,22,133,4,23,197,1,27,249,
+22,1,22,78,249,22,2,22,133,4,248,22,133,4,248,22,65,199,249,22,190,
+3,80,158,39,35,251,22,74,1,22,119,105,116,104,45,99,111,110,116,105,110,
+117,97,116,105,111,110,45,109,97,114,107,2,24,250,22,75,1,23,101,120,116,
 101,110,100,45,112,97,114,97,109,101,116,101,114,105,122,97,116,105,111,110,21,
 95,1,27,99,111,110,116,105,110,117,97,116,105,111,110,45,109,97,114,107,45,
-115,101,116,45,102,105,114,115,116,11,2,24,201,250,22,74,2,20,9,248,22,
-65,203,27,248,22,65,248,22,132,4,23,197,1,28,248,22,71,23,194,2,20,
-15,159,36,35,36,249,22,189,3,80,158,38,35,27,248,22,132,4,248,22,64,
-23,198,2,28,249,22,161,8,62,61,62,248,22,190,3,248,22,88,23,197,2,
-250,22,73,2,20,248,22,73,249,22,73,21,93,2,25,248,22,64,199,250,22,
-74,2,8,249,22,73,2,25,249,22,73,248,22,97,203,2,25,248,22,65,202,
-251,22,73,2,17,28,249,22,161,8,248,22,190,3,248,22,64,23,201,2,64,
-101,108,115,101,10,248,22,64,23,198,2,250,22,74,2,20,9,248,22,65,23,
-201,1,249,22,63,2,8,248,22,65,23,203,1,99,8,31,8,30,8,29,8,
-28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,57,57,56,50,16,4,
-11,11,2,19,3,1,7,101,110,118,57,57,56,51,18,158,94,10,64,118,111,
-105,100,8,47,27,248,22,65,248,22,132,4,196,249,22,189,3,80,158,38,35,
-28,248,22,51,248,22,190,3,248,22,64,197,250,22,73,2,26,248,22,73,248,
-22,64,199,248,22,88,198,27,248,22,190,3,248,22,64,197,250,22,73,2,26,
-248,22,73,248,22,64,197,250,22,74,2,23,248,22,65,199,248,22,65,202,159,
+115,101,116,45,102,105,114,115,116,11,2,24,201,250,22,75,2,20,9,248,22,
+66,203,27,248,22,66,248,22,133,4,23,197,1,28,248,22,72,23,194,2,20,
+15,159,36,35,36,249,22,190,3,80,158,38,35,27,248,22,133,4,248,22,65,
+23,198,2,28,249,22,162,8,62,61,62,248,22,191,3,248,22,89,23,197,2,
+250,22,74,2,20,248,22,74,249,22,74,21,93,2,25,248,22,65,199,250,22,
+75,2,8,249,22,74,2,25,249,22,74,248,22,98,203,2,25,248,22,66,202,
+251,22,74,2,17,28,249,22,162,8,248,22,191,3,248,22,65,23,201,2,64,
+101,108,115,101,10,248,22,65,23,198,2,250,22,75,2,20,9,248,22,66,23,
+201,1,249,22,64,2,8,248,22,66,23,203,1,99,8,31,8,30,8,29,8,
+28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,57,57,56,53,16,4,
+11,11,2,19,3,1,7,101,110,118,57,57,56,54,18,158,94,10,64,118,111,
+105,100,8,47,27,248,22,66,248,22,133,4,196,249,22,190,3,80,158,38,35,
+28,248,22,52,248,22,191,3,248,22,65,197,250,22,74,2,26,248,22,74,248,
+22,65,199,248,22,89,198,27,248,22,191,3,248,22,65,197,250,22,74,2,26,
+248,22,74,248,22,65,197,250,22,75,2,23,248,22,66,199,248,22,66,202,159,
 35,20,103,159,35,16,1,2,1,16,0,83,158,41,20,100,138,69,35,37,109,
 105,110,45,115,116,120,2,2,11,10,11,10,35,80,158,35,35,20,103,159,35,
 16,0,16,0,11,11,16,0,35,11,38,35,11,11,16,10,2,3,2,4,2,
@@ -99,7 +99,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 2032);
   }
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,51,60,0,0,0,1,0,0,3,0,16,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,52,60,0,0,0,1,0,0,3,0,16,0,
 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,
 157,1,202,1,226,1,9,2,11,2,68,2,158,3,199,3,33,5,137,5,241,
@@ -131,177 +131,177 @@
 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,
 114,111,111,116,32,112,97,116,104,58,32,5,0,27,20,14,159,80,158,36,50,
-250,80,158,39,51,249,22,27,11,80,158,41,50,22,177,12,10,248,22,154,5,
-23,196,2,28,248,22,151,6,23,194,2,12,87,94,248,22,164,8,23,194,1,
-248,80,159,37,53,36,195,28,248,22,71,23,195,2,9,27,248,22,64,23,196,
-2,27,28,248,22,158,13,23,195,2,23,194,1,28,248,22,157,13,23,195,2,
-249,22,159,13,23,196,1,250,80,158,42,48,248,22,173,13,2,20,11,10,250,
-80,158,40,48,248,22,173,13,2,20,23,197,1,10,28,23,193,2,249,22,63,
-248,22,161,13,249,22,159,13,23,198,1,247,22,174,13,27,248,22,65,23,200,
-1,28,248,22,71,23,194,2,9,27,248,22,64,23,195,2,27,28,248,22,158,
-13,23,195,2,23,194,1,28,248,22,157,13,23,195,2,249,22,159,13,23,196,
-1,250,80,158,47,48,248,22,173,13,2,20,11,10,250,80,158,45,48,248,22,
-173,13,2,20,23,197,1,10,28,23,193,2,249,22,63,248,22,161,13,249,22,
-159,13,23,198,1,247,22,174,13,248,80,159,45,52,36,248,22,65,23,199,1,
-87,94,23,193,1,248,80,159,43,52,36,248,22,65,23,197,1,87,94,23,193,
-1,27,248,22,65,23,198,1,28,248,22,71,23,194,2,9,27,248,22,64,23,
-195,2,27,28,248,22,158,13,23,195,2,23,194,1,28,248,22,157,13,23,195,
-2,249,22,159,13,23,196,1,250,80,158,45,48,248,22,173,13,2,20,11,10,
-250,80,158,43,48,248,22,173,13,2,20,23,197,1,10,28,23,193,2,249,22,
-63,248,22,161,13,249,22,159,13,23,198,1,247,22,174,13,248,80,159,43,52,
-36,248,22,65,23,199,1,248,80,159,41,52,36,248,22,65,196,27,248,22,134,
-13,23,195,2,28,23,193,2,192,87,94,23,193,1,28,248,22,156,6,23,195,
-2,27,248,22,156,13,195,28,192,192,248,22,157,13,195,11,87,94,28,28,248,
-22,135,13,23,195,2,10,27,248,22,134,13,23,196,2,28,23,193,2,192,87,
-94,23,193,1,28,248,22,156,6,23,196,2,27,248,22,156,13,23,197,2,28,
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+129,14,0,9,35,114,120,35,34,91,46,93,34,248,22,141,13,23,203,1,6,
+1,1,95,28,248,22,157,6,23,202,2,249,22,169,7,23,203,1,8,63,23,
+201,1,28,248,22,136,13,23,199,2,248,22,137,13,23,199,1,87,94,23,198,
+1,247,22,138,13,28,248,22,135,13,194,249,22,153,13,195,194,192,249,247,22,
+188,4,194,11,249,80,158,37,46,9,9,249,80,158,37,46,195,9,27,247,22,
+178,13,249,80,158,38,47,28,23,195,2,27,248,22,174,7,6,11,11,80,76,
 84,67,79,76,76,69,67,84,83,28,192,192,6,0,0,6,0,0,27,28,23,
-196,1,250,22,152,13,248,22,173,13,69,97,100,100,111,110,45,100,105,114,247,
-22,171,7,6,8,8,99,111,108,108,101,99,116,115,11,27,248,80,159,41,52,
-36,250,22,77,23,203,1,248,22,73,248,22,173,13,72,99,111,108,108,101,99,
-116,115,45,100,105,114,23,204,1,28,23,194,2,249,22,63,23,196,1,23,195,
-1,192,32,48,89,162,8,44,38,54,2,19,222,33,49,27,249,22,184,13,23,
-197,2,23,198,2,28,23,193,2,87,94,23,196,1,27,248,22,88,23,195,2,
-27,27,248,22,97,23,197,1,27,249,22,184,13,23,201,2,23,196,2,28,23,
-193,2,87,94,23,194,1,27,248,22,88,23,195,2,27,250,2,48,23,203,2,
-23,204,1,248,22,97,23,199,1,28,249,22,150,7,23,196,2,2,28,249,22,
-77,23,202,2,194,249,22,63,248,22,143,13,23,197,1,23,195,1,87,95,23,
-199,1,23,193,1,28,249,22,150,7,23,196,2,2,28,249,22,77,23,200,2,
-9,249,22,63,248,22,143,13,23,197,1,9,28,249,22,150,7,23,196,2,2,
-28,249,22,77,197,194,87,94,23,196,1,249,22,63,248,22,143,13,23,197,1,
-194,87,94,23,193,1,28,249,22,150,7,23,198,2,2,28,249,22,77,195,9,
-87,94,23,194,1,249,22,63,248,22,143,13,23,199,1,9,87,95,28,28,248,
-22,144,7,194,10,248,22,156,6,194,12,250,22,191,8,2,14,6,21,21,98,
+196,1,250,22,153,13,248,22,174,13,69,97,100,100,111,110,45,100,105,114,247,
+22,172,7,6,8,8,99,111,108,108,101,99,116,115,11,27,248,80,159,41,52,
+36,250,22,78,23,203,1,248,22,74,248,22,174,13,72,99,111,108,108,101,99,
+116,115,45,100,105,114,23,204,1,28,23,194,2,249,22,64,23,196,1,23,195,
+1,192,32,48,89,162,8,44,38,54,2,19,222,33,49,27,249,22,185,13,23,
+197,2,23,198,2,28,23,193,2,87,94,23,196,1,27,248,22,89,23,195,2,
+27,27,248,22,98,23,197,1,27,249,22,185,13,23,201,2,23,196,2,28,23,
+193,2,87,94,23,194,1,27,248,22,89,23,195,2,27,250,2,48,23,203,2,
+23,204,1,248,22,98,23,199,1,28,249,22,151,7,23,196,2,2,28,249,22,
+78,23,202,2,194,249,22,64,248,22,144,13,23,197,1,23,195,1,87,95,23,
+199,1,23,193,1,28,249,22,151,7,23,196,2,2,28,249,22,78,23,200,2,
+9,249,22,64,248,22,144,13,23,197,1,9,28,249,22,151,7,23,196,2,2,
+28,249,22,78,197,194,87,94,23,196,1,249,22,64,248,22,144,13,23,197,1,
+194,87,94,23,193,1,28,249,22,151,7,23,198,2,2,28,249,22,78,195,9,
+87,94,23,194,1,249,22,64,248,22,144,13,23,199,1,9,87,95,28,28,248,
+22,145,7,194,10,248,22,157,6,194,12,250,22,128,9,2,14,6,21,21,98,
 121,116,101,32,115,116,114,105,110,103,32,111,114,32,115,116,114,105,110,103,196,
-28,28,248,22,72,195,249,22,4,22,134,13,196,11,12,250,22,191,8,2,14,
+28,28,248,22,73,195,249,22,4,22,135,13,196,11,12,250,22,128,9,2,14,
 6,13,13,108,105,115,116,32,111,102,32,112,97,116,104,115,197,250,2,48,197,
-195,28,248,22,156,6,197,248,22,167,7,197,196,32,51,89,162,8,44,39,57,
+195,28,248,22,157,6,197,248,22,168,7,197,196,32,51,89,162,8,44,39,57,
 2,19,222,33,54,32,52,89,162,8,44,38,54,70,102,111,117,110,100,45,101,
 120,101,99,222,33,53,28,23,193,2,91,159,38,11,90,161,38,35,11,248,22,
-155,13,23,199,2,87,95,23,195,1,23,194,1,27,28,23,198,2,27,248,22,
-160,13,23,201,2,28,249,22,163,8,23,195,2,23,202,2,11,28,248,22,156,
-13,23,194,2,250,2,52,23,201,2,23,202,2,249,22,152,13,23,200,2,23,
+156,13,23,199,2,87,95,23,195,1,23,194,1,27,28,23,198,2,27,248,22,
+161,13,23,201,2,28,249,22,164,8,23,195,2,23,202,2,11,28,248,22,157,
+13,23,194,2,250,2,52,23,201,2,23,202,2,249,22,153,13,23,200,2,23,
 198,1,250,2,52,23,201,2,23,202,2,23,196,1,11,28,23,193,2,192,87,
-94,23,193,1,27,28,248,22,134,13,23,196,2,27,249,22,152,13,23,198,2,
-23,201,2,28,28,248,22,147,13,193,10,248,22,146,13,193,192,11,11,28,23,
-193,2,192,87,94,23,193,1,28,23,199,2,11,27,248,22,160,13,23,202,2,
-28,249,22,163,8,23,195,2,23,203,1,11,28,248,22,156,13,23,194,2,250,
-2,52,23,202,1,23,203,1,249,22,152,13,23,201,1,23,198,1,250,2,52,
-201,202,195,194,28,248,22,71,23,197,2,11,27,248,22,159,13,248,22,64,23,
-199,2,27,249,22,152,13,23,196,1,23,197,2,28,248,22,146,13,23,194,2,
-250,2,52,198,199,195,87,94,23,193,1,27,248,22,65,23,200,1,28,248,22,
-71,23,194,2,11,27,248,22,159,13,248,22,64,23,196,2,27,249,22,152,13,
-23,196,1,23,200,2,28,248,22,146,13,23,194,2,250,2,52,201,202,195,87,
-94,23,193,1,27,248,22,65,23,197,1,28,248,22,71,23,194,2,11,27,248,
-22,159,13,248,22,64,195,27,249,22,152,13,23,196,1,202,28,248,22,146,13,
-193,250,2,52,204,205,195,251,2,51,204,205,206,248,22,65,199,87,95,28,27,
-248,22,134,13,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,156,
-6,23,196,2,27,248,22,156,13,23,197,2,28,23,193,2,192,87,94,23,193,
-1,248,22,157,13,23,197,2,11,12,250,22,191,8,2,15,6,25,25,112,97,
+94,23,193,1,27,28,248,22,135,13,23,196,2,27,249,22,153,13,23,198,2,
+23,201,2,28,28,248,22,148,13,193,10,248,22,147,13,193,192,11,11,28,23,
+193,2,192,87,94,23,193,1,28,23,199,2,11,27,248,22,161,13,23,202,2,
+28,249,22,164,8,23,195,2,23,203,1,11,28,248,22,157,13,23,194,2,250,
+2,52,23,202,1,23,203,1,249,22,153,13,23,201,1,23,198,1,250,2,52,
+201,202,195,194,28,248,22,72,23,197,2,11,27,248,22,160,13,248,22,65,23,
+199,2,27,249,22,153,13,23,196,1,23,197,2,28,248,22,147,13,23,194,2,
+250,2,52,198,199,195,87,94,23,193,1,27,248,22,66,23,200,1,28,248,22,
+72,23,194,2,11,27,248,22,160,13,248,22,65,23,196,2,27,249,22,153,13,
+23,196,1,23,200,2,28,248,22,147,13,23,194,2,250,2,52,201,202,195,87,
+94,23,193,1,27,248,22,66,23,197,1,28,248,22,72,23,194,2,11,27,248,
+22,160,13,248,22,65,195,27,249,22,153,13,23,196,1,202,28,248,22,147,13,
+193,250,2,52,204,205,195,251,2,51,204,205,206,248,22,66,199,87,95,28,27,
+248,22,135,13,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,157,
+6,23,196,2,27,248,22,157,13,23,197,2,28,23,193,2,192,87,94,23,193,
+1,248,22,158,13,23,197,2,11,12,250,22,128,9,2,15,6,25,25,112,97,
 116,104,32,111,114,32,115,116,114,105,110,103,32,40,115,97,110,115,32,110,117,
-108,41,23,197,2,28,28,23,195,2,28,27,248,22,134,13,23,197,2,28,23,
-193,2,192,87,94,23,193,1,28,248,22,156,6,23,197,2,27,248,22,156,13,
-23,198,2,28,23,193,2,192,87,94,23,193,1,248,22,157,13,23,198,2,11,
-248,22,156,13,23,196,2,11,10,12,250,22,191,8,2,15,6,29,29,35,102,
+108,41,23,197,2,28,28,23,195,2,28,27,248,22,135,13,23,197,2,28,23,
+193,2,192,87,94,23,193,1,28,248,22,157,6,23,197,2,27,248,22,157,13,
+23,198,2,28,23,193,2,192,87,94,23,193,1,248,22,158,13,23,198,2,11,
+248,22,157,13,23,196,2,11,10,12,250,22,128,9,2,15,6,29,29,35,102,
 32,111,114,32,114,101,108,97,116,105,118,101,32,112,97,116,104,32,111,114,32,
-115,116,114,105,110,103,23,198,2,28,28,248,22,156,13,23,195,2,91,159,38,
-11,90,161,38,35,11,248,22,155,13,23,198,2,249,22,161,8,194,68,114,101,
-108,97,116,105,118,101,11,27,248,22,173,7,6,4,4,80,65,84,72,251,2,
+115,116,114,105,110,103,23,198,2,28,28,248,22,157,13,23,195,2,91,159,38,
+11,90,161,38,35,11,248,22,156,13,23,198,2,249,22,162,8,194,68,114,101,
+108,97,116,105,118,101,11,27,248,22,174,7,6,4,4,80,65,84,72,251,2,
 51,23,199,1,23,200,1,23,201,1,28,23,197,2,27,249,80,158,43,47,23,
-200,1,9,28,249,22,161,8,247,22,175,7,2,21,249,22,63,248,22,143,13,
-5,1,46,23,195,1,192,9,27,248,22,159,13,23,196,1,28,248,22,146,13,
+200,1,9,28,249,22,162,8,247,22,176,7,2,21,249,22,64,248,22,144,13,
+5,1,46,23,195,1,192,9,27,248,22,160,13,23,196,1,28,248,22,147,13,
 193,250,2,52,198,199,195,11,250,80,158,38,48,196,197,11,250,80,158,38,48,
-196,11,11,87,94,249,22,147,6,247,22,183,4,195,248,22,173,5,249,22,169,
-3,35,249,22,153,3,197,198,27,28,23,197,2,87,95,23,196,1,23,195,1,
-23,197,1,87,94,23,197,1,27,248,22,173,13,2,20,27,249,80,158,40,48,
-23,196,1,11,27,27,248,22,172,3,23,200,1,28,192,192,35,27,27,248,22,
-172,3,23,202,1,28,192,192,35,249,22,150,5,23,197,1,83,158,39,20,97,
+196,11,11,87,94,249,22,148,6,247,22,184,4,195,248,22,174,5,249,22,170,
+3,35,249,22,154,3,197,198,27,28,23,197,2,87,95,23,196,1,23,195,1,
+23,197,1,87,94,23,197,1,27,248,22,174,13,2,20,27,249,80,158,40,48,
+23,196,1,11,27,27,248,22,173,3,23,200,1,28,192,192,35,27,27,248,22,
+173,3,23,202,1,28,192,192,35,249,22,151,5,23,197,1,83,158,39,20,97,
 95,89,162,8,44,35,47,9,224,3,2,33,58,23,195,1,23,196,1,27,248,
-22,135,5,23,195,1,248,80,159,38,53,36,193,159,35,20,103,159,35,16,1,
+22,136,5,23,195,1,248,80,159,38,53,36,193,159,35,20,103,159,35,16,1,
 65,98,101,103,105,110,16,0,83,158,41,20,100,138,67,35,37,117,116,105,108,
 115,2,1,11,11,10,10,42,80,158,35,35,20,103,159,37,16,17,30,2,1,
 2,2,193,30,2,1,2,3,193,30,2,1,2,4,193,30,2,1,2,5,193,
@@ -319,7 +319,7 @@
 158,35,16,2,89,162,43,36,48,2,19,223,0,33,29,80,159,35,53,36,83,
 158,35,16,2,89,162,8,44,36,55,2,19,223,0,33,30,80,159,35,52,36,
 83,158,35,16,2,32,0,89,162,43,36,44,2,2,222,33,31,80,159,35,35,
-36,83,158,35,16,2,249,22,158,6,7,92,7,92,80,159,35,36,36,83,158,
+36,83,158,35,16,2,249,22,159,6,7,92,7,92,80,159,35,36,36,83,158,
 35,16,2,89,162,43,36,53,2,4,223,0,33,32,80,159,35,37,36,83,158,
 35,16,2,32,0,89,162,8,44,37,49,2,5,222,33,33,80,159,35,38,36,
 83,158,35,16,2,32,0,89,162,8,44,38,50,2,6,222,33,35,80,159,35,
@@ -332,8 +332,8 @@
 222,33,44,80,159,35,45,36,83,158,35,16,2,83,158,38,20,96,96,2,13,
 89,162,43,35,43,9,223,0,33,45,89,162,43,36,44,9,223,0,33,46,89,
 162,43,37,54,9,223,0,33,47,80,159,35,46,36,83,158,35,16,2,27,248,
-22,180,13,248,22,167,7,27,28,249,22,161,8,247,22,175,7,2,21,6,1,
-1,59,6,1,1,58,250,22,140,7,6,14,14,40,91,94,126,97,93,42,41,
+22,181,13,248,22,168,7,27,28,249,22,162,8,247,22,176,7,2,21,6,1,
+1,59,6,1,1,58,250,22,141,7,6,14,14,40,91,94,126,97,93,42,41,
 126,97,40,46,42,41,23,196,2,23,196,1,89,162,8,44,37,47,2,14,223,
 0,33,50,80,159,35,47,36,83,158,35,16,2,83,158,38,20,96,96,2,15,
 89,162,8,44,38,53,9,223,0,33,55,89,162,43,37,46,9,223,0,33,56,
@@ -344,12 +344,12 @@
     EVAL_ONE_SIZED_STR((char *)expr, 5068);
   }
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,51,8,0,0,0,1,0,0,6,0,19,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,52,8,0,0,0,1,0,0,6,0,19,0,
 34,0,48,0,62,0,76,0,111,0,0,0,255,0,0,0,65,113,117,111,116,
 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,
-37,107,101,114,110,101,108,11,98,10,35,11,8,188,229,97,159,2,2,35,35,
+37,107,101,114,110,101,108,11,98,10,35,11,8,190,229,97,159,2,2,35,35,
 159,2,3,35,35,159,2,4,35,35,159,2,5,35,35,159,2,6,35,35,16,
 0,159,35,20,103,159,35,16,1,65,98,101,103,105,110,16,0,83,158,41,20,
 100,138,69,35,37,98,117,105,108,116,105,110,29,11,11,11,10,10,18,96,11,
@@ -361,7 +361,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 292);
   }
   {
-    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,51,52,0,0,0,1,0,0,3,0,14,0,
+    static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,52,46,49,46,50,46,52,52,0,0,0,1,0,0,3,0,14,0,
 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,
 82,1,185,1,230,1,250,1,29,2,64,2,98,2,108,2,155,2,165,2,172,
@@ -383,148 +383,148 @@
 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,
 103,110,111,114,101,100,249,22,14,195,80,158,37,45,249,80,159,37,48,36,195,
-10,27,28,23,195,2,28,249,22,161,8,23,197,2,80,158,38,46,87,94,23,
-195,1,80,158,36,47,27,248,22,170,4,23,197,2,28,248,22,134,13,23,194,
-2,91,159,38,11,90,161,38,35,11,248,22,155,13,23,197,1,87,95,83,160,
+10,27,28,23,195,2,28,249,22,162,8,23,197,2,80,158,38,46,87,94,23,
+195,1,80,158,36,47,27,248,22,171,4,23,197,2,28,248,22,135,13,23,194,
+2,91,159,38,11,90,161,38,35,11,248,22,156,13,23,197,1,87,95,83,160,
 37,11,80,158,40,46,198,83,160,37,11,80,158,40,47,192,192,11,11,28,23,
-193,2,192,87,94,23,193,1,27,247,22,188,4,28,192,192,247,22,174,13,20,
-14,159,80,158,35,39,250,80,158,38,40,249,22,27,11,80,158,40,39,22,188,
-4,28,248,22,134,13,23,198,2,23,197,1,87,94,23,197,1,247,22,174,13,
-247,194,250,22,152,13,23,197,1,23,199,1,249,80,158,42,38,23,198,1,2,
-18,252,22,152,13,23,199,1,23,201,1,6,6,6,110,97,116,105,118,101,247,
-22,176,7,249,80,158,44,38,23,200,1,80,158,44,35,87,94,23,194,1,27,
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-51,42,248,22,140,14,247,22,181,11,11,28,23,193,2,192,87,94,23,193,1,
-27,247,22,121,87,94,250,22,135,2,80,158,52,42,248,22,140,14,247,22,181,
-11,195,192,87,95,28,23,209,1,27,250,22,137,2,23,197,2,197,11,28,23,
+249,80,159,45,48,36,248,22,89,23,205,2,11,90,161,36,37,11,28,248,22,
+72,248,22,91,23,204,2,28,248,22,72,23,194,2,249,22,187,13,0,8,35,
+114,120,34,91,46,93,34,23,196,2,11,10,27,27,28,23,197,2,249,22,78,
+28,248,22,72,248,22,91,23,208,2,21,93,6,5,5,109,122,108,105,98,249,
+22,1,22,78,249,22,2,80,159,51,56,36,248,22,91,23,211,2,23,197,2,
+28,248,22,72,23,196,2,248,22,74,23,197,2,23,195,2,251,80,158,49,50,
+2,20,23,204,1,248,22,65,23,198,2,248,22,66,23,198,1,249,22,153,13,
+23,195,1,28,23,198,1,87,94,23,196,1,23,197,1,28,248,22,72,23,197,
+1,87,94,23,197,1,6,7,7,109,97,105,110,46,115,115,28,249,22,187,13,
+0,8,35,114,120,34,91,46,93,34,23,199,2,23,197,1,249,22,180,6,23,
+199,1,6,3,3,46,115,115,28,249,22,162,8,248,22,65,23,201,2,64,102,
+105,108,101,249,22,160,13,248,22,164,13,248,22,89,23,202,2,248,80,159,42,
+55,36,23,202,2,12,87,94,28,28,248,22,135,13,23,194,2,10,248,22,179,
+7,23,194,2,87,94,23,200,1,12,28,23,200,2,250,22,191,8,67,114,101,
+113,117,105,114,101,249,22,141,7,6,17,17,98,97,100,32,109,111,100,117,108,
+101,32,112,97,116,104,126,97,28,23,198,2,248,22,65,23,199,2,6,0,0,
+23,203,1,87,94,23,200,1,250,22,128,9,2,20,249,22,141,7,6,13,13,
+109,111,100,117,108,101,32,112,97,116,104,126,97,28,23,198,2,248,22,65,23,
+199,2,6,0,0,23,201,2,27,28,248,22,179,7,23,195,2,249,22,184,7,
+23,196,2,35,249,22,162,13,248,22,163,13,23,197,2,11,27,28,248,22,179,
+7,23,196,2,249,22,184,7,23,197,2,36,248,80,158,42,51,23,195,2,91,
+159,38,11,90,161,38,35,11,28,248,22,179,7,23,199,2,250,22,7,2,22,
+249,22,184,7,23,203,2,37,2,22,248,22,156,13,23,198,2,87,95,23,195,
+1,23,193,1,27,28,248,22,179,7,23,200,2,249,22,184,7,23,201,2,38,
+249,80,158,47,52,23,197,2,5,0,27,28,248,22,179,7,23,201,2,249,22,
+184,7,23,202,2,39,248,22,170,4,23,200,2,27,27,250,22,138,2,80,158,
+51,42,248,22,141,14,247,22,182,11,11,28,23,193,2,192,87,94,23,193,1,
+27,247,22,122,87,94,250,22,136,2,80,158,52,42,248,22,141,14,247,22,182,
+11,195,192,87,95,28,23,209,1,27,250,22,138,2,23,197,2,197,11,28,23,
 193,1,12,87,95,27,27,28,248,22,17,80,158,51,45,80,158,50,45,247,22,
-19,250,22,25,248,22,23,23,197,2,80,158,53,44,23,196,1,27,248,22,140,
-14,247,22,181,11,249,22,3,83,158,39,20,97,94,89,162,8,44,36,54,9,
+19,250,22,25,248,22,23,23,197,2,80,158,53,44,23,196,1,27,248,22,141,
+14,247,22,182,11,249,22,3,83,158,39,20,97,94,89,162,8,44,36,54,9,
 226,12,11,2,3,33,46,23,195,1,23,196,1,248,28,248,22,17,80,158,50,
 45,32,0,89,162,43,36,41,9,222,33,47,80,159,49,57,36,89,162,43,35,
-50,9,227,14,9,8,4,3,33,48,250,22,135,2,23,197,1,197,10,12,28,
-28,248,22,178,7,23,202,1,11,27,248,22,156,6,23,208,2,28,192,192,28,
-248,22,61,23,208,2,249,22,161,8,248,22,64,23,210,2,2,21,11,250,22,
-135,2,80,158,50,43,28,248,22,156,6,23,210,2,249,22,63,23,211,1,248,
-80,159,53,55,36,23,213,1,87,94,23,210,1,249,22,63,23,211,1,247,22,
-175,13,252,22,180,7,23,208,1,23,207,1,23,205,1,23,203,1,201,12,193,
+50,9,227,14,9,8,4,3,33,48,250,22,136,2,23,197,1,197,10,12,28,
+28,248,22,179,7,23,202,1,11,27,248,22,157,6,23,208,2,28,192,192,28,
+248,22,62,23,208,2,249,22,162,8,248,22,65,23,210,2,2,21,11,250,22,
+136,2,80,158,50,43,28,248,22,157,6,23,210,2,249,22,64,23,211,1,248,
+80,159,53,55,36,23,213,1,87,94,23,210,1,249,22,64,23,211,1,247,22,
+176,13,252,22,181,7,23,208,1,23,207,1,23,205,1,23,203,1,201,12,193,
 91,159,37,10,90,161,36,35,10,11,90,161,36,36,10,83,158,38,20,96,96,
 2,20,89,162,8,44,36,50,9,224,2,0,33,42,89,162,43,38,48,9,223,
 1,33,43,89,162,43,39,8,30,9,225,2,3,0,33,49,208,87,95,248,22,
-149,4,248,80,158,37,49,247,22,181,11,248,22,187,4,80,158,36,36,248,22,
-172,12,80,159,36,41,36,159,35,20,103,159,35,16,1,65,98,101,103,105,110,
+150,4,248,80,158,37,49,247,22,182,11,248,22,188,4,80,158,36,36,248,22,
+173,12,80,159,36,41,36,159,35,20,103,159,35,16,1,65,98,101,103,105,110,
 16,0,83,158,41,20,100,138,66,35,37,98,111,111,116,2,1,11,11,10,10,
 36,80,158,35,35,20,103,159,39,16,19,30,2,1,2,2,193,30,2,1,2,
 3,193,30,2,5,72,112,97,116,104,45,115,116,114,105,110,103,63,10,30,2,
@@ -545,11 +545,11 @@
 44,9,223,0,33,24,80,159,35,56,36,83,158,35,16,2,89,162,43,36,48,
 67,103,101,116,45,100,105,114,223,0,33,25,80,159,35,55,36,83,158,35,16,
 2,89,162,43,37,48,68,119,105,116,104,45,100,105,114,223,0,33,26,80,159,
-35,54,36,83,158,35,16,2,248,22,175,7,69,115,111,45,115,117,102,102,105,
+35,54,36,83,158,35,16,2,248,22,176,7,69,115,111,45,115,117,102,102,105,
 120,80,159,35,35,36,83,158,35,16,2,89,162,43,37,59,2,3,223,0,33,
 35,80,159,35,36,36,83,158,35,16,2,32,0,89,162,8,44,36,41,2,7,
-222,192,80,159,35,41,36,83,158,35,16,2,247,22,124,80,159,35,42,36,83,
-158,35,16,2,247,22,123,80,159,35,43,36,83,158,35,16,2,247,22,59,80,
+222,192,80,159,35,41,36,83,158,35,16,2,247,22,125,80,159,35,42,36,83,
+158,35,16,2,247,22,124,80,159,35,43,36,83,158,35,16,2,247,22,60,80,
 159,35,44,36,83,158,35,16,2,248,22,18,74,109,111,100,117,108,101,45,108,
 111,97,100,105,110,103,80,159,35,45,36,83,158,35,16,2,11,80,158,35,46,
 83,158,35,16,2,11,80,158,35,47,83,158,35,16,2,32,0,89,162,43,37,
diff --git a/src/mzscheme/src/fun.c b/src/mzscheme/src/fun.c
index e3755b37ee..f818f942f8 100644
--- a/src/mzscheme/src/fun.c
+++ b/src/mzscheme/src/fun.c
@@ -119,6 +119,7 @@ static Scheme_Object *extract_cc_marks (int argc, Scheme_Object *argv[]);
 static Scheme_Object *extract_cc_markses (int argc, Scheme_Object *argv[]);
 static Scheme_Object *extract_cc_proc_marks (int argc, Scheme_Object *argv[]);
 static Scheme_Object *extract_one_cc_mark (int argc, Scheme_Object *argv[]);
+static Scheme_Object *call_with_immediate_cc_mark (int argc, Scheme_Object *argv[]);
 static Scheme_Object *void_func (int argc, Scheme_Object *argv[]);
 static Scheme_Object *void_p (int argc, Scheme_Object *argv[]);
 static Scheme_Object *dynamic_wind (int argc, Scheme_Object *argv[]);
@@ -398,6 +399,11 @@ scheme_init_fun (Scheme_Env *env)
 						      "continuation-mark-set-first",
 						      2, 4),
 			     env);
+  scheme_add_global_constant("call-with-immediate-continuation-mark",
+			     scheme_make_prim_w_arity(call_with_immediate_cc_mark,
+						      "call-with-immediate-continuation-mark",
+						      2, 3),
+			     env);
   scheme_add_global_constant("continuation-mark-set?",
 			     scheme_make_prim_w_arity(cc_marks_p,
 						      "continuation-mark-set?",
@@ -3942,6 +3948,42 @@ int scheme_escape_continuation_ok(Scheme_Object *ec)
     return 0;
 }
 
+static Scheme_Object *call_with_immediate_cc_mark (int argc, Scheme_Object *argv[])
+{
+  Scheme_Thread *p = scheme_current_thread;
+  long findpos, bottom;
+  Scheme_Object *a[1], *key;
+
+  scheme_check_proc_arity("call-with-immediate-continuation-mark", 1, 1, argc, argv);
+
+  key = argv[0];
+  if (argc > 2)
+    a[0] = argv[2];
+  else
+    a[0] = scheme_false;
+
+  findpos = (long)MZ_CONT_MARK_STACK;
+  bottom = (long)p->cont_mark_stack_bottom;
+  while (1) {
+    if (findpos-- > bottom) {
+      Scheme_Cont_Mark *seg = p->cont_mark_stack_segments[findpos >> SCHEME_LOG_MARK_SEGMENT_SIZE];
+      long pos = findpos & SCHEME_MARK_SEGMENT_MASK;
+      Scheme_Cont_Mark *find = seg + pos;
+
+      if ((long)find->pos < (long)MZ_CONT_MARK_POS) {
+        break;
+      } else {
+        if (find->key == key) {
+          a[0] = find->val;
+          break;
+        }
+      }
+    }
+  }
+
+  return scheme_tail_apply(argv[1], 1, a);
+}
+
 static Scheme_Object *
 do_call_with_sema(const char *who, int enable_break, int argc, Scheme_Object *argv[])
 {
diff --git a/src/mzscheme/src/schminc.h b/src/mzscheme/src/schminc.h
index e52b2971db..468bba7d2c 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 937
+#define EXPECTED_PRIM_COUNT 938
 
 #ifdef MZSCHEME_SOMETHING_OMITTED
 # undef USE_COMPILED_STARTUP
diff --git a/src/mzscheme/src/schvers.h b/src/mzscheme/src/schvers.h
index 0cf01f49ab..5757a0394a 100644
--- a/src/mzscheme/src/schvers.h
+++ b/src/mzscheme/src/schvers.h
@@ -13,12 +13,12 @@
    consistently.)
 */
 
-#define MZSCHEME_VERSION "4.1.2.3"
+#define MZSCHEME_VERSION "4.1.2.4"
 
 #define MZSCHEME_VERSION_X 4
 #define MZSCHEME_VERSION_Y 1
 #define MZSCHEME_VERSION_Z 2
-#define MZSCHEME_VERSION_W 3
+#define MZSCHEME_VERSION_W 4
 
 #define MZSCHEME_VERSION_MAJOR ((MZSCHEME_VERSION_X * 100) + MZSCHEME_VERSION_Y)
 #define MZSCHEME_VERSION_MINOR ((MZSCHEME_VERSION_Z * 1000) + MZSCHEME_VERSION_W)