diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Environment-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Environment-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// The last Environment on the environment chain always has .type == "object" and .object === the global object.
+
+var g = newGlobal();
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+g.eval("function h() { debugger; }");
+var hits = 0;
+dbg.onDebuggerStatement = function (hframe) {
+    var env = hframe.older.environment;
+    while (env.parent)
+        env = env.parent;
+    assertEq(env.type, "object");
+    assertEq(env.object, gw);
+    hits++;
+};
+
+g.eval("h();");
+g.eval("(function () { h(); return []; })();");
+g.eval("with (Math) { h(-2 * PI); }");
+assertEq(hits, 3);