diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/Array-mapPar-nested.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/Array-mapPar-nested.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+load(libdir + "parallelarray-helpers.js")
+
+function test() {
+  var pa0 = range(0, 256);
+
+  var pa1;
+  for (var i in MODES)
+    pa1 = Array.buildPar(256, function (x) {
+      return pa0.mapPar(function(y) { return x * 1000 + y; });
+    }, MODES[i]);
+
+  for (var x = 0; x < 256; x++) {
+    var pax = pa1[x];
+    for (var y = 0; y < 256; y++) {
+      assertEq(pax[y], x * 1000 + y);
+    }
+  }
+}
+
+if (getBuildConfiguration().parallelJS)
+  test();