1 files changed, 16 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug984830.js b/js/src/jit-test/tests/ion/bug984830.js
new file mode 100644
index 0000000000..a8c2db1ab8
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug984830.js
@@ -0,0 +1,16 @@
+function getTestCaseResult(expected, actual) {
+      if (actual != expected)
+              return Math.abs(actual - expected) <= 1E-10;
+}
+function InstanceOf(object, constructor) {
+      while ( object != null )
+              object = object.__proto__;
+}
+function WorkerBee () {}
+function Engineer () {}
+Engineer.prototype = new WorkerBee();
+var pat = new Engineer();
+getTestCaseResult(pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype);
+getTestCaseResult(InstanceOf(pat, Engineer));
+evaluate("getTestCaseResult( Object.prototype.__proto__ );",
+	 { isRunOnce: true });