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+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test concat on small and large arrays
+ */
+
+var poses = [140, 4000000000];
+while (pos = poses.shift()) {
+  var a = new Array(pos);
+  assertEquals(pos, a.length);
+  a.push('foo');
+  assertEquals(pos + 1, a.length);
+  var b = ['bar'];
+  var c = a.concat(b);
+  assertEquals(pos + 2, c.length);
+  assertEquals("undefined", typeof(c[pos - 1]));
+  assertEquals("foo", c[pos]);
+  assertEquals("bar", c[pos + 1]);
+
+  // Can we fool the system by putting a number in a string?
+  var onetwofour = "124";
+  a[onetwofour] = 'doo';
+  assertEquals(a[124], 'doo');
+  c = a.concat(b);
+  assertEquals(c[124], 'doo');
+
+  // If we put a number in the prototype, then the spec says it should be
+  // copied on concat.
+  Array.prototype["123"] = 'baz';
+  assertEquals(a[123], 'baz');
+
+  c = a.concat(b);
+  assertEquals(pos + 2, c.length);
+  assertEquals("baz", c[123]);
+  assertEquals("undefined", typeof(c[pos - 1]));
+  assertEquals("foo", c[pos]);
+  assertEquals("bar", c[pos + 1]);
+
+  // When we take the number off the prototype it disappears from a, but
+  // the concat put it in c itself.
+  Array.prototype["123"] = undefined;
+  assertEquals("undefined", typeof(a[123]));
+  assertEquals("baz", c[123]);
+
+  // If the element of prototype is shadowed, the element on the instance
+  // should be copied, but not the one on the prototype.
+  Array.prototype[123] = 'baz';
+  a[123] = 'xyz';
+  assertEquals('xyz', a[123]);
+  c = a.concat(b);
+  assertEquals('xyz', c[123]);
+
+  // Non-numeric properties on the prototype or the array shouldn't get
+  // copied.
+  Array.prototype.moe = 'joe';
+  a.ben = 'jerry';
+  assertEquals(a["moe"], 'joe');
+  assertEquals(a["ben"], 'jerry');
+  c = a.concat(b);
+  // ben was not copied
+  assertEquals("undefined", typeof(c.ben));
+  // moe was not copied, but we can see it through the prototype
+  assertEquals("joe", c.moe);
+
+  // When we take moe off the prototype it disappears from all arrays.
+  Array.prototype.moe = undefined;
+  assertEquals("undefined", typeof(c.moe));
+
+  // Negative indeces don't get concated.
+  a[-1] = 'minus1';
+  assertEquals("minus1", a[-1]);
+  assertEquals("undefined", typeof(a[0xffffffff]));
+  c = a.concat(b);
+  assertEquals("undefined", typeof(c[-1]));
+  assertEquals("undefined", typeof(c[0xffffffff]));
+  assertEquals(c.length, a.length + 1);
+
+}
+
+a = [];
+c = a.concat('Hello');
+assertEquals(1, c.length);
+assertEquals("Hello", c[0]);
+assertEquals("Hello", c.toString());
+
+// Check that concat preserves holes.
+var holey = [void 0,'a',,'c'].concat(['d',,'f',[0,,2],void 0])
+assertEquals(9, holey.length);  // hole in embedded array is ignored
+for (var i = 0; i < holey.length; i++) {
+  if (i == 2 || i == 5) {
+    assertFalse(i in holey);
+  } else {
+    assertTrue(i in holey);
+  }
+}