diff -r 000000000000 -r 6474c204b198 js/jsd/test/bug507448.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/jsd/test/bug507448.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+
+function f() {}
+function g(a,b) {}
+function h(me, too, here) { var x = 1; }
+function annoying(a, b, a, b, b, a) {}
+function manyLocals(a, b, c, d, e, f, g, h, i, j, k, l, m) {
+  var n, o, p, q, r, s, t, u, v, w, x, y, z;
+}
+
+assertArraysEqual(jsd.wrapValue(f).script.getParameterNames(), []);
+assertArraysEqual(jsd.wrapValue(g).script.getParameterNames(), ["a", "b"]);
+assertArraysEqual(jsd.wrapValue(h).script.getParameterNames(), ["me", "too", "here"]);
+assertArraysEqual(jsd.wrapValue(annoying).script.getParameterNames(),
+                  ["a", "b", "a", "b", "b", "a"]);
+assertArraysEqual(jsd.wrapValue(manyLocals).script.getParameterNames(),
+                  "abcdefghijklm".split(""));
+
+if (!jsdOnAtStart) {
+  // turn JSD off if it wasn't on when this test started
+  jsd.off();
+  ok(!jsd.isOn, "JSD shouldn't be running at the end of this test.");
+}
+
+SimpleTest.finish();
\ No newline at end of file