diff -r 7bc78045adfd -r 868ad94dc3ec rt/emul/compact/src/test/java/org/apidesign/bck2brwsr/tck/LongArithmeticTest.java
--- a/rt/emul/compact/src/test/java/org/apidesign/bck2brwsr/tck/LongArithmeticTest.java	Wed Oct 09 14:50:29 2013 +0200
+++ b/rt/emul/compact/src/test/java/org/apidesign/bck2brwsr/tck/LongArithmeticTest.java	Mon Aug 11 18:19:38 2014 +0200
@@ -114,7 +114,15 @@
 
         return (trueCount == 1) ? result : -2;
     }
-
+    
+    @Compare public int parameterSlotCount() {
+        long argCounts = 281479271874563L;
+        return unpack(argCounts, 2);
+    }
+    private static char unpack(long packed, int word) { // word==0 => return a, ==3 => return d
+        assert(word <= 3);
+        return (char)(packed >> ((3-word) * 16));
+    }
     @Compare public long conversion() {
         return Long.MAX_VALUE;
     }