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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

var gTestfile = 'regress-383674.js';
//-----------------------------------------------------------------------------
var BUGNUMBER = 383674;
var summary = 'Statement that implicitly calls toString should not be optimized away as a "useless expression"';
var actual = '';
var expect = '';


//-----------------------------------------------------------------------------
test();
//-----------------------------------------------------------------------------

function test()
{
  enterFunc ('test');
  printBugNumber(BUGNUMBER);
  printStatus (summary);
    
  options("strict");
  options("werror");

  expect = 'toString called';
  actual = 'toString not called';
  try
  {
    var x = {toString: function() { 
        actual = 'toString called'; 
        print(actual); 
      } 
    }; 
    var f = function() { var j = x; j + ""; }
    f();
    reportCompare(expect, actual, summary + ': 1');
  }
  catch(ex)
  {
    reportCompare("No Error", ex + "", summary + ': 1');
  }

  actual = 'toString not called';
  try
  {
    (function() { const a = 
         ({toString: function(){
             actual = 'toString called'; print(actual)} }); a += ""; })();
    reportCompare(expect, actual, summary + ': 2');
  }
  catch(ex)
  {
    reportCompare("No Error", ex + "", summary + ': 2');
  }

  exitFunc ('test');
}