diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-onPop-16.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-onPop-16.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// onPop handlers fire even on frames that make tail calls.
+var g = newGlobal();
+var dbg = new Debugger(g);
+var log;
+
+g.eval('function f(n) { if (n > 0) f(n-1); else debugger; }');
+
+dbg.onEnterFrame = function handleEnter(frame) {
+    log += '(';
+    frame.onPop = function handlePop(c) {
+        log += ')';
+        assertEq(typeof c == "object" && 'return' in c, true);
+    };
+};
+
+log = '';
+g.f(10);
+assertEq(log, "((((((((((()))))))))))");