diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Script-gc-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Script-gc-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+// |jit-test| debug
+// Debugger.Script instances with live referents stay alive.
+
+var N = 4;
+var g = newGlobal();
+var dbg = new Debugger(g);
+var i;
+dbg.onDebuggerStatement = function (frame) {
+    assertEq(frame.script instanceof Debugger.Script, true);
+    frame.script.id = i;
+};
+
+g.eval('var arr = [];')
+for (i = 0; i < N; i++)  // loop to defeat conservative GC
+    g.eval("arr.push(function () { debugger }); arr[arr.length - 1]();");
+
+gc();
+
+var hits;
+dbg.onDebuggerStatement = function (frame) {
+    hits++;
+    assertEq(frame.script.id, i);
+};
+hits = 0;
+for (i = 0; i < N; i++)
+    g.arr[i]();
+assertEq(hits, N);