1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/iterator-indices-8.js b/js/src/jit-test/tests/ion/iterator-indices-8.js
new file mode 100644
index 0000000000..b27cd5f4dc
--- /dev/null
+++ b/js/src/jit-test/tests/ion/iterator-indices-8.js
@@ -0,0 +1,32 @@
+// Tests megamorphic stores to fixed and dynamics slots, and dense elements
+function test(obj) {
+  let index = 0;
+  for (var s in obj) {
+    obj[s] = index;
+    index++;
+  }
+  index = 0;
+  for (var s in obj) {
+    assertEq(obj[s], index);
+    index++;
+  }
+}
+
+var arr = [];
+var elem_obj = [];
+for (var i = 0; i < 20; i++) {
+  var obj = {};
+  for (var j = 0; j < i; j++) {
+    obj["x_" + i + "_" + j] = 1;
+  }
+  arr.push(obj);
+  elem_obj.push(1);
+}
+arr.push(elem_obj);
+
+with ({}) {}
+for (var i = 0; i < 2000; i++) {
+  var idx = i % arr.length;
+  test(arr[idx]);
+}
+