1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testUndefinedIncrement.js b/js/src/jit-test/tests/basic/testUndefinedIncrement.js
new file mode 100644
index 0000000..885b13a
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testUndefinedIncrement.js
@@ -0,0 +1,22 @@
+function f() {
+    var n;
+    var k;
+    for (var i = 0; i < 2*RUNLOOP; ++i) {
+	n = undefined;
+	k = n++;
+	if (k) { }
+    }
+    return [k, n];
+}
+
+var [a, b] = f();
+
+assertEq(isNaN(a), true);
+assertEq(isNaN(b), true);
+
+checkStats({
+    recorderStarted: 1,
+    recorderAborted: 0,
+    traceCompleted: 1,
+    traceTriggered: 1
+});