diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-eval-13.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-eval-13.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// The debugger may add new bindings into existing scopes
+
+var g = newGlobal();
+var dbg = new Debugger(g);
+dbg.onDebuggerStatement = function(frame) {
+    assertEq(frame.eval("var x = 3; x").return, 3);
+    hits++;
+}
+var hits = 0;
+g.eval("(function() { debugger; })()");
+assertEq(hits, 1);
+g.eval("(function() { var x = 4; debugger; })()");
+assertEq(hits, 2);