v8/test/debugger/debug/regress/regress-crbug-107996.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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Debug = debug.Debug;

Debug.setListener(listener);
var exception = null;
var fourteen;
var four_in_debugger = [];

function listener(event, exec_state, event_data, data) {
  if (event == Debug.DebugEvent.Break) {
    try {
      for (var i = 0; i < exec_state.frameCount() - 1; i++) {
        var frame = exec_state.frame(i);
        four_in_debugger[i] = frame.evaluate("four", false).value();
      }
    } catch (e) {
      exception = e;
    }
  }
}

function f1() {
  var three = 3;
  var four = 4;
  (function f2() {
     var seven = 7;
     (function f3() {
        debugger;
        fourteen = three + four + seven;
     })();
  })();
}

f1();
assertEquals(14, fourteen);
assertEquals(4, four_in_debugger[0]);
assertEquals(4, four_in_debugger[1]);
assertEquals(4, four_in_debugger[2]);

Debug.setListener(null);
assertNull(exception);