diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Source-text-lazy.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Source-text-lazy.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/*
+ * Debugger.Source.prototype.text should correctly retrieve the source for
+ * code compiled with CompileOptions::LAZY_SOURCE.
+ */
+
+// withSourceHook isn't defined if you pass the shell the --fuzzing-safe
+// option. Skip this test silently, to avoid spurious failures.
+if (typeof withSourceHook != 'function')
+  quit(0);
+
+let g = newGlobal();
+let dbg = new Debugger(g);
+
+function test(source) {
+  // To ensure that we're getting the value the source hook returns, make
+  // it differ from the actual source.
+  let frobbed = source.replace(/debugger/, 'reggubed');
+  let log = '';
+
+  withSourceHook(function (url) {
+    log += 's';
+    assertEq(url, "BanalBivalve.jsm");
+    return frobbed;
+  }, () => {
+    dbg.onDebuggerStatement = function (frame) {
+      log += 'd';
+      assertEq(frame.script.source.text, frobbed);
+    }
+
+    g.evaluate(source, { fileName: "BanalBivalve.jsm",
+                         sourceIsLazy: true });
+  });
+
+  assertEq(log, 'ds');
+}
+
+test("debugger; // Ignominious Iguana");
+test("(function () { debugger; /* Meretricious Marmoset */})();");
+test("(() => { debugger; })(); // Gaunt Gibbon");