diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/dispatch-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/dispatch-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+// Test removing hooks during dispatch.
+
+var g = newGlobal();
+var log = '';
+
+function addDebug(n) {
+    for (var i = 0; i < n; i++) {
+        var dbg = new Debugger(g);
+        dbg.num = i;
+        dbg.onDebuggerStatement = function (stack) {
+            log += this.num + ', ';
+            this.enabled = false;
+            this.onDebuggerStatement = undefined;
+            gc();
+        };
+    }
+    dbg = null;
+}
+
+addDebug(10);
+g.eval("debugger;");
+assertEq(log, '0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ');