diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/Array-scanPar-sorted.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/Array-scanPar-sorted.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+// |jit-test| slow;
+
+load(libdir + "parallelarray-helpers.js");
+
+function mergeSorted(l1, l2) {
+  var result = [];
+  var i1 = 0, i2 = 0, j = 0;
+  while (i1 < l1.length && i2 < l2.length) {
+    if (l1[i1] < l2[i2])
+      result[j++] = l1[i1++];
+    else
+      result[j++] = l2[i2++];
+  }
+  while (i1 < l1.length) {
+    result[j++] = l1[i1++];
+  }
+  while (i2 < l2.length) {
+    result[j++] = l2[i2++];
+  }
+  return result;
+}
+
+function test() {
+  var elts = [];
+  var ints = range(1, 5), c = 0;
+
+  // Using 2048 as the length of elts induces bailouts due to GC.
+  // This exposed various bugs.
+  for (var i = 0; i < 2048; i++)
+    elts[i] = ints;
+
+  var scanned1 = seq_scan(elts, mergeSorted);
+  var scanned2 = elts.scanPar(mergeSorted);
+  assertStructuralEq(scanned1, scanned2);
+}
+
+if (getBuildConfiguration().parallelJS)
+  test();