diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/bailout-executed.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/bailout-executed.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+load(libdir + "parallelarray-helpers.js");
+
+function makeObject(e, i, c) {
+  var v = {element: e, index: i, collection: c};
+
+  if (e == 0) // note: happens once
+    delete v.index;
+
+  return v;
+}
+
+function test() {
+  var array = range(0, 768);
+  var array1 = array.map(makeObject);
+
+  assertParallelExecWillRecover(function (m) {
+    var pa = array.mapPar(makeObject, m);
+    assertStructuralEq(pa, array1);
+  });
+}
+
+if (getBuildConfiguration().parallelJS)
+  test();