diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug977674.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug977674.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,41 @@
+if (!getBuildConfiguration().parallelJS)
+  quit(0);
+
+function testReduce() {
+  function sum(a, b) {
+    var r = a + b;
+  }
+  var array = build(8 * 0X0aaec , function() { return 1; });
+  var parResult = array.reducePar(sum);
+}
+for (var ix = 0; ix < 3; ++ix) {
+  testReduce();
+}
+function build(n, f) {
+  var result = [];
+  for (var i = 0; i < n; i++)
+    result.push(f(i));
+  return result;
+}
+function seq_scan(array, f) {
+  for (var i = 1; i < array.length; i++) {
+  }
+}
+function assertAlmostEq(v1, v2) {
+    if (e1 instanceof Array && e2 instanceof Array) {
+      for (prop in e1) {
+        if (e1.hasOwnProperty(prop)) {        }
+      }
+    }
+}
+function assertEqArray(a, b) {
+    for (var i = 0, l = a.length; i < l; i++) {
+      try {      } catch (e) {      }
+    }
+}
+function assertParallelExecWillRecover(opFunction) {
+assertParallelExecSucceeds(
+    function(m) {},
+    function(r) {}
+);
+}