src/Pure/Concurrent/synchronized.ML

--- a/src/Pure/Concurrent/synchronized.ML	Sun Jul 10 16:09:08 2011 +0200
+++ b/src/Pure/Concurrent/synchronized.ML	Sun Jul 10 16:13:37 2011 +0200
@@ -71,11 +71,11 @@
 
 fun counter () =
   let
-    val counter = var "counter" 0;
+    val counter = var "counter" (0: int);
     fun next () =
       change_result counter
         (fn i =>
-          let val j = i + 1
+          let val j = i + (1: int)
           in (j, j) end);
   in next end;