diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-onPop-18.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-onPop-18.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+// A garbage collection in the debugger compartment does not disturb onPop
+// handlers.
+var g = newGlobal();
+var dbg = new Debugger(g);
+var log;
+
+dbg.onEnterFrame = function handleEnter(frame) {
+    log += '(';
+    frame.onPop = function handlePop(completion) {
+        log += ')';
+    };
+};
+
+dbg.onDebuggerStatement = function handleDebugger (frame) {
+    log += 'd';
+    // GC in the debugger's compartment only.
+    gc(dbg);
+};
+
+log = '';
+assertEq(g.eval('debugger; 42;'), 42);
+assertEq(log, '(d)');