--- a/nashorn/src/jdk/nashorn/internal/runtime/arrays/MapIterator.java	Mon Apr 15 08:39:48 2013 -0300
+++ b/nashorn/src/jdk/nashorn/internal/runtime/arrays/MapIterator.java	Mon Apr 15 20:12:50 2013 +0530
@@ -66,8 +66,7 @@
             bumpIndex();
         }
 
-        // special case - balk at iterating to infinity or MAX_UINT
-        return (length != JSType.MAX_UINT) && indexInArray();
+        return indexInArray();
     }
 
     @Override

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8012240.js	Mon Apr 15 20:12:50 2013 +0530
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8012240: Array.prototype.map.call({length: -1, get 0(){throw 0}}, function(){}).length does not throw error
+ *
+ * @test
+ * @run
+ */
+
+var in_getter_for_0 = false;
+
+try {
+    Array.prototype.map.call(
+        {
+            length: -1, 
+            get 0() {
+                in_getter_for_0 = true;
+                throw 0;
+            }
+        }, 
+    function(){}).length;
+} catch (e) {
+    if (e !== 0 || !in_getter_for_0) {
+       fail("should have thrown error from getter for '0'th element");
+    }
+}