diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/regress/regress-383902.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/regress/regress-383902.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var c = 0;
+
+function f(a) {
+  const b = a;
+  try {
+    eval('"use strict"; b = 1 + a; c = 1');
+    assertEq(0, 1);
+  } catch (e) {
+    assertEq(e.name, 'TypeError');
+    assertEq(0, c);
+    assertEq(a, b);
+  }
+}
+
+var w = 42;
+f(w);
+
+c = 2;
+try {
+  eval('"use strict"; function g(x) { const y = x; y = 1 + x; } c = 3');
+  assertEq(0, 1);
+} catch (e) {
+  assertEq(e.name, 'TypeError');
+  assertEq(2, c);
+}
+
+c = 4;
+try {
+  eval('"use strict"; const z = w; z = 1 + w; c = 5');
+  assertEq(0, 1);
+} catch (e) {
+  assertEq(e.name, 'TypeError');
+  assertEq(4, c);
+  assertEq('z' in this, false);
+}
+
+reportCompare(0, 0, "ok");