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diff --git a/deps/v8/test/mjsunit/debug-constructed-by.js b/deps/v8/test/mjsunit/debug-constructed-by.js
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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.
+
+// Flags: --expose-debug-as debug
+// Get the Debug object exposed from the debug context global object.
+Debug = debug.Debug
+
+// Simple constructor.
+function Point(x,y) {}
+
+// Create mirror for the constructor.
+var ctor = debug.MakeMirror(Point);
+
+// Initially no instances.
+assertEquals(0, ctor.constructedBy().length);
+assertEquals(0, ctor.constructedBy(0).length);
+assertEquals(0, ctor.constructedBy(1).length);
+assertEquals(0, ctor.constructedBy(10).length);
+
+// Create an instance.
+var p = new Point();
+assertEquals(1, ctor.constructedBy().length);
+assertEquals(1, ctor.constructedBy(0).length);
+assertEquals(1, ctor.constructedBy(1).length);
+assertEquals(1, ctor.constructedBy(10).length);
+
+
+// Create 10 more instances making for 11.
+ps = [];
+for (var i = 0; i < 10; i++) {
+  ps.push(new Point());
+}
+assertEquals(11, ctor.constructedBy().length);
+assertEquals(11, ctor.constructedBy(0).length);
+assertEquals(1, ctor.constructedBy(1).length);
+assertEquals(10, ctor.constructedBy(10).length);