diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testLambdaCtor.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testLambdaCtor.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+function testLambdaCtor() {
+    var a = [];
+    for (var x = 0; x < 9; ++x) {
+        var f = function(){};
+        a[a.length] = new f;
+    }
+
+    assertEq([8].__proto__ !== a[7].__proto__, true);
+
+    // Assert that the last f was properly constructed.
+    return a[8].__proto__ === f.prototype;
+}
+assertEq(testLambdaCtor(), true);