diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Environment-parent-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Environment-parent-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// The objects on the environment chain are all Debugger.Environment objects.
+// The environment chain ends in null.
+
+var g = newGlobal()
+g.eval("function f(a) { return function (b) { return function (c) { h(); return a + b + c; }; }; }");
+var dbg = Debugger(g);
+var hits = 0;
+g.h = function () {
+    var n = 0;
+    for (var env = dbg.getNewestFrame().environment; env !== null; env = env.parent) {
+        n++;
+        assertEq(env instanceof Debugger.Environment, true);
+    }
+    assertEq(n >= 4, true);
+    hits++;
+};
+assertEq(g.f(5)(7)(9), 21);
+assertEq(hits, 1);