test/mjsunit/regress/regress-131994.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// Flags: --expose-debug-as debug

// Test that a variable in the local scope that shadows a context-allocated
// variable is correctly resolved when being evaluated in the debugger.

Debug = debug.Debug;

var exception = false;

function listener(event, exec_state, event_data, data) {
  if (event != Debug.DebugEvent.Break) return;
  var breakpoint = exec_state.frame(0);
  try {
    // Assert correct break point.
    assertTrue(breakpoint.sourceLineText().indexOf("// Break") > -1);
    // Assert correct value.
    assertEquals(3, breakpoint.evaluate('x').value());
  } catch (e) {
    exception = e;
  }
}

Debug.setListener(listener);

function h() {
  var x;  // Context-allocated due to g().

  var g = function g() {
    x = -7;
  };

  var f = function f() {
    var x = 3;  // Allocated in the local scope.
    debugger;  // Break.
  };

  f();
}

h();

assertFalse(exception);