1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/indexed-iteration.js b/js/src/jit-test/tests/basic/indexed-iteration.js
new file mode 100644
index 0000000000..952aa105ba
--- /dev/null
+++ b/js/src/jit-test/tests/basic/indexed-iteration.js
@@ -0,0 +1,20 @@
+
+// Don't use NativeIterator cache for objects with dense elements.
+
+function bar(a) {
+  var n = 0;
+  for (var b in a) { n++; }
+  return n;
+}
+
+function foo() {
+  var x = {a:0,b:1};
+  var y = {a:0,b:1};
+  y[0] = 2;
+  y[1] = 3;
+  for (var i = 0; i < 10; i++) {
+    assertEq(bar(x), 2);
+    assertEq(bar(y), 4);
+  }
+}
+foo();