diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/alloc-array-nonwritable.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/alloc-array-nonwritable.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+load(libdir + "parallelarray-helpers.js");
+
+function buildSimple()
+{
+  var subarr = [];
+  for (var i = 0; i < 100; i++)
+    subarr[i] = 3;
+  subarr[100] = 0;
+
+  var expected = [];
+  for (var i = 0; i < 256; i++)
+    expected[i] = subarr;
+
+  var pa = Array.buildPar(256, function(_) {
+    var arrs = [];
+    for (var i = 0; i < 100; i++)
+      arrs[i] = [0, 1, 2, 3, 4, 5, 6];
+
+    arrs[100] =
+      Object.defineProperty([0, 1, 2, 3, 4, 5, 6, 7],
+                            "length",
+                            { writable: false, value: 7 });
+
+    for (var i = 0; i < 101; i++)
+      arrs[i][7] = 7;
+
+    var x = [];
+    for (var i = 0; i < 101; i++) {
+      var a = arrs[i];
+      x[i] = +(a.length === 8) + 2 * +("7" in a);
+    }
+
+    return x;
+  });
+
+  assertEqArray(pa, expected);
+}
+
+if (getBuildConfiguration().parallelJS)
+  buildSimple();