1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testBug703857.js b/js/src/jit-test/tests/basic/testBug703857.js
new file mode 100644
index 0000000000..dcdcc1e1f1
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testBug703857.js
@@ -0,0 +1,13 @@
+Function.prototype.X = 42;
+function ownProperties() {
+    var props = {};
+    var r = function () {};
+    for (var a in r) {
+        {
+            let a = function() { for (var r=0;r<6;++r) ++a; };
+            a();
+        }
+        props[a] = true;
+    }
+}
+ownProperties();