diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Script-source-03.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Script-source-03.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/*
+ * Script.prototype.source should be a different object for the same script
+ * within different debuggers.
+ */
+let g = newGlobal();
+let dbg1 = new Debugger(g);
+let dbg2 = new Debugger(g);
+
+var count = 0;
+var source;
+function test(script) {
+    ++count;
+    if (!source)
+        source = script.source;
+    else
+        assertEq(script.source != source, true);
+};
+dbg1.onNewScript = test;
+dbg2.onNewScript = test;
+
+g.eval("2 * 3");
+assertEq(count, 2);