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diff --git a/deps/v8/test/mjsunit/debug-script.js b/deps/v8/test/mjsunit/debug-script.js
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+++ b/deps/v8/test/mjsunit/debug-script.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 --expose-gc
+// Get the Debug object exposed from the debug context global object.
+Debug = debug.Debug
+
+Date();
+RegExp();
+
+// Count script types.
+var named_native_count = 0;
+var extension_count = 0;
+var normal_count = 0;
+var scripts = Debug.scripts();
+for (i = 0; i < scripts.length; i++) {
+  if (scripts[i].type == Debug.ScriptType.Native) {
+    if (scripts[i].name) {
+      named_native_count++;
+    }
+  } else if (scripts[i].type == Debug.ScriptType.Extension) {
+    extension_count++;
+  } else if (scripts[i].type == Debug.ScriptType.Normal) {
+    normal_count++;
+  } else {
+    assertUnreachable('Unexpected type ' + scripts[i].type);
+  }
+}
+
+// This has to be updated if the number of native scripts change.
+assertEquals(12, named_native_count);
+// If no snapshot is used, only the 'gc' extension is loaded.
+// If snapshot is used, all extensions are cached in the snapshot.
+assertTrue(extension_count == 1 || extension_count == 5);
+// This script and mjsunit.js has been loaded.  If using d8, d8 loads
+// a normal script during startup too.
+assertTrue(normal_count == 2 || normal_count == 3);
+
+// Test a builtins script.
+var math_script = Debug.findScript('native math.js');
+assertEquals('native math.js', math_script.name);
+assertEquals(Debug.ScriptType.Native, math_script.type);
+
+// Test a builtins delay loaded script.
+var date_delay_script = Debug.findScript('native date.js');
+assertEquals('native date.js', date_delay_script.name);
+assertEquals(Debug.ScriptType.Native, date_delay_script.type);
+
+// Test a debugger script.
+var debug_delay_script = Debug.findScript('native debug.js');
+assertEquals('native debug.js', debug_delay_script.name);
+assertEquals(Debug.ScriptType.Native, debug_delay_script.type);
+
+// Test an extension script.
+var extension_gc_script = Debug.findScript('v8/gc');
+if (extension_gc_script) {
+  assertEquals('v8/gc', extension_gc_script.name);
+  assertEquals(Debug.ScriptType.Extension, extension_gc_script.type);
+}
+
+// Test a normal script.
+var mjsunit_js_script = Debug.findScript(/mjsunit.js/);
+assertTrue(/mjsunit.js/.test(mjsunit_js_script.name));
+assertEquals(Debug.ScriptType.Normal, mjsunit_js_script.type);
+
+// Check a nonexistent script.
+var dummy_script = Debug.findScript('dummy.js');
+assertTrue(typeof dummy_script == 'undefined');