node/deps/v8/test/mjsunit/harmony/debug-evaluate-blockscopes.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// Flags: --expose-debug-as debug --harmony-scoping

// Test debug evaluation for functions without local context, but with
// nested catch contexts.

// TODO(ES6): properly activate extended mode
"use strict";

var x;
var result;

function f() {
  {                   // Line 1.
    let i = 1;        // Line 2.
    try {             // Line 3.
      throw 'stuff';  // Line 4.
    } catch (e) {     // Line 5.
      x = 2;          // Line 6.
    }
  }
};

// Get the Debug object exposed from the debug context global object.
var Debug = debug.Debug
// Set breakpoint on line 6.
var bp = Debug.setBreakPoint(f, 6);

function listener(event, exec_state, event_data, data) {
  if (event == Debug.DebugEvent.Break) {
    result = exec_state.frame().evaluate("i").value();
  }
};

// Add the debug event listener.
Debug.setListener(listener);
result = -1;
f();
assertEquals(1, result);

// Clear breakpoint.
Debug.clearBreakPoint(bp);
// Get rid of the debug event listener.
Debug.setListener(null);