diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/bug983558.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/bug983558.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+if (!getBuildConfiguration().parallelJS)
+  quit(0);
+
+x = [];
+Array.prototype.push.call(x, 2);
+y = x.mapPar(function() {});
+Object.defineProperty(y, 3, {
+    get: (function() {
+        try {
+            Int8Array(y);
+            x.reducePar(function() {});
+        } catch (e) { print(e); }
+    })
+});
+y + '';