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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: --allow-natives-syntax --expose-debug-as debug
      6 
      7 Debug = debug.Debug
      8 var exception = null;
      9 
     10 function listener(event, exec_state, event_data, data) {
     11   try {
     12     if (event == Debug.DebugEvent.Break) {
     13       exec_state.prepareStep(Debug.StepAction.StepIn);
     14     }
     15   } catch (e) {
     16     exception = e;
     17   }
     18 }
     19 
     20 Debug.setListener(listener);
     21 
     22 function f(x) {
     23   if (x > 0) %_Call(f, null, x-1);
     24 }
     25 
     26 debugger;
     27 f(2);
     28 
     29 Debug.setListener(null);
     30 assertNull(exception);
     31