diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/regress/regress-610026.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/regress/regress-610026.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var expect = "pass";
+var actual;
+
+/*
+ * We hardcode here that GenerateBlockId limits a program to 2^20 blocks. Start
+ * with 2^19 blocks, then test 2^20 - 1 blocks, finally test the limit.
+ */
+var s = "{}";
+for (var i = 0; i < 21; i++)
+    s += s;
+
+try {
+    eval(s);
+    actual = "pass";
+} catch (e) {
+    actual = "fail: " + e;
+}
+
+assertEq(actual, expect);
+
+s += s.slice(0, -2);
+
+try {
+    eval(s);
+    actual = "pass";
+} catch (e) {
+    actual = "fail: " + e;
+}
+
+assertEq(actual, expect);
+
+s += "{}";
+
+try {
+    eval(s);
+    actual = "fail: expected InternalError: program too large";
+} catch (e) {
+    actual = (e.message == "program too large") ? "pass" : "fail: " + e;
+}
+
+assertEq(actual, expect);
+
+reportCompare(0, 0, "ok");