1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/dense-elements-appear.js b/js/src/jit-test/tests/basic/dense-elements-appear.js
new file mode 100644
index 000000000..351f8f676
--- /dev/null
+++ b/js/src/jit-test/tests/basic/dense-elements-appear.js
@@ -0,0 +1,28 @@
+function f() {
+    var x = [1, 2, 3];
+    var y = {};
+    x.__proto__ = y;
+
+    for (var i = 0; i < 200; i++) {
+        if (i == 100)
+            y[100000] = 15;
+        else
+            assertEq(typeof x[100000], i > 100 ? "number" : "undefined");
+    }
+}
+
+function g() {
+    var x = [1, 2, 3];
+    var y = {};
+    x.__proto__ = y;
+
+    for (var i = 0; i < 200; i++) {
+        if (i == 100)
+            y[4] = 15;
+        else
+            assertEq(typeof x[4], i > 100 ? "number" : "undefined");
+    }
+}
+
+f();
+g();