1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/iter-megamorphic.js b/js/src/jit-test/tests/cacheir/iter-megamorphic.js
new file mode 100644
index 0000000000..8fcfe7dcd5
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/iter-megamorphic.js
@@ -0,0 +1,18 @@
+function testIter(v) {
+    var c = 0;
+    for (var p in v) {
+        c++;
+    }
+    assertEq(c === 0 || c === 1, true);
+    assertEq(c === 0, v === null || v === undefined);
+}
+function test() {
+    var vals = [{a: 1}, {b: 1}, {c: 1}, {d: 1}, null, undefined,
+                {e: 1}, {f: 1}, {g: 1}, {h: 1}, {i: 1}];
+    for (var i = 0; i < 100; i++) {
+        for (var v of vals) {
+            testIter(v);
+        }
+    }
+}
+test();