diff -r 868ad94dc3ec -r 4e349118658f 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	Mon Aug 11 18:19:38 2014 +0200
+++ b/rt/emul/compact/src/test/java/org/apidesign/bck2brwsr/tck/LongArithmeticTest.java	Mon Aug 11 20:10:46 2014 +0200
@@ -117,11 +117,13 @@
     
     @Compare public int parameterSlotCount() {
         long argCounts = 281479271874563L;
-        return unpack(argCounts, 2);
+        int x = unpack(argCounts, 2);
+        return x;
     }
     private static char unpack(long packed, int word) { // word==0 => return a, ==3 => return d
         assert(word <= 3);
-        return (char)(packed >> ((3-word) * 16));
+        final long val = packed >> ((3-word) * 16);
+        return (char)val;
     }
     @Compare public long conversion() {
         return Long.MAX_VALUE;