diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/Array-reducePar-fn-args.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/Array-reducePar-fn-args.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+load(libdir + "parallelarray-helpers.js");
+
+function testReduce() {
+  // Test reduce elemental fun args
+  var N = 64;
+  var p = range(1, N+1);
+  var r = p.reducePar(function (a, b) {
+    assertEq(a >= 1 && a <= N, true);
+    assertEq(b >= 1 && b <= N, true);
+    return a;
+  });
+  assertEq(r >= 1 && r <= N, true);
+}
+
+if (getBuildConfiguration().parallelJS)
+  testReduce();