added in another sk test

lang/kernel.rkt

@@ -312,10 +312,10 @@
 ;;  foldr
 ;;  sort
 ;;  build-list
-;;  box
+  box
 ;;  box-immutable
-;;  unbox
+  unbox
-;;  set-box!
+  set-box!
 ;;  make-hash
 ;;  make-hasheq
 ;;  hash-set!

tests/more-tests/run-more-tests.rkt

@@ -8,4 +8,5 @@
 
 (test "hello.rkt")
 (test "sk-generator.rkt")
+(test "sk-generator-2.rkt")
 #;(test "simple-structs.rkt")

tests/more-tests/sk-generator-2.expected

@@ -0,0 +1,6 @@
+"a"
+"b"
+"c"
+1
+2
+3

tests/more-tests/sk-generator-2.rkt

@@ -0,0 +1,32 @@
+#lang planet dyoo/whalesong
+(define (make-gen gen)
+ (let ([cont (box #f)])
+   (lambda ()
+     (call/cc (lambda (caller)
+                (if (unbox cont)
+                    ((unbox cont) caller)
+                    (gen (lambda (v)
+                           (call/cc (lambda (gen-k)
+                                      (begin
+                                        (set-box! cont gen-k)
+                                        (caller v))))))))))))
+
+(define g1 (make-gen (lambda (return)
+                      (begin
+                        (return "a")
+                        (return "b")
+                        (return "c")))))
+
+(define g2 (make-gen (lambda (ret)
+                      (begin
+                        (ret 1)
+                        (ret 2)
+                        (ret 3)))))
+
+(g1)
+(g1)
+(g1)
+
+(g2)
+(g2)
+(g2)