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      1 // Copyright 2014 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Flags: --expose-debug-as debug
      6 
      7 'use strict';
      8 
      9 var Debug = debug.Debug
     10 
     11 var done = false;
     12 var stepCount = 0;
     13 
     14 function listener(event, execState, eventData, data) {
     15   if (event == Debug.DebugEvent.Break) {
     16     if (!done) {
     17       execState.prepareStep(Debug.StepAction.StepIn);
     18       var s = execState.frame().sourceLineText();
     19       assertTrue(s.indexOf('// ' + stepCount + '.') !== -1);
     20       stepCount++;
     21     }
     22   }
     23 };
     24 
     25 Debug.setListener(listener);
     26 
     27 function GetBase() {
     28   var x = 1;   // 1.
     29   var y = 2;   // 2.
     30   done = true; // 3.
     31   return null;
     32 }
     33 
     34 function f() {
     35   class Derived extends GetBase() {} // 0.
     36 }
     37 
     38 var bp = Debug.setBreakPoint(f, 0);
     39 f();
     40 assertEquals(4, stepCount);
     41 
     42 Debug.setListener(null);
     43