diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Environment-getVariable-09.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Environment-getVariable-09.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// getVariable works on ancestors of frame.environment.
+
+var g = newGlobal();
+var dbg = Debugger(g);
+var log = '';
+dbg.onDebuggerStatement = function (frame) {
+    for (var env = frame.environment; env; env = env.parent) {
+        if (env.find("x") === env)
+            log += env.getVariable("x");
+    }
+};
+g.eval("var x = 1; { let x = 2; with (Object.create({x: 3})) { debugger; } }");
+assertEq(log, "321");