diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/alloc-different-objs.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/alloc-different-objs.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+load(libdir + "parallelarray-helpers.js");
+
+function testMap() {
+  assertArraySeqParResultsEq(range(0, 64), "map", function (v) {
+    var x = [];
+    var N = 2;
+    for (var i = 0; i < 10; i++) {
+      if ((i % N) == 0) {
+        x[i] = {f1: v};
+      } else if ((i % N) == 1) {
+        x[i] = {f1: v, f2: v, f3: v,
+                f4: v, f5: v, f6: v,
+                f7: v, f8: v, f9: v};
+      }
+    }
+    return x;
+  });
+}
+
+if (getBuildConfiguration().parallelJS)
+  testMap();
+