old_contents: // Copyright 2013 Traceur Authors.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  'use strict';
  
  var fs = require('fs');
  var traceur = require('./traceur.js');
  var util = require('./file-util.js');
  var inlineAndCompile = require('./inline-module.js').inlineAndCompile;
  
  var ErrorReporter = traceur.util.ErrorReporter;
  var TreeWriter = traceur.outputgeneration.TreeWriter;
  
  function interpret(filename, argv, flags) {
    var reporter = new ErrorReporter();
    var mainModule = require.main;
    var execArgv = [mainModule.filename].concat(flags || []);
  
    process.argv = ['traceur', filename].concat(argv || []);
    process.execArgv = process.execArgv.concat(execArgv);
  
    inlineAndCompile([filename], {}, reporter, function(tree) {
      var compiledCode = TreeWriter.write(tree);
  
      // TODO: use a new module rather than the main one.
      mainModule.filename = fs.realpathSync(filename);
      mainModule._compile(compiledCode, mainModule.filename);
    }, function(err) {
      console.error(err);
      process.exit(1);
    });
  }
  
  module.exports = interpret;
  
new_contents: // Copyright 2013 Traceur Authors.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  'use strict';
  
  var fs = require('fs');
  var Module = require('module');
  var traceur = require('./traceur.js');
  var util = require('./file-util.js');
  var inlineAndCompile = require('./inline-module.js').inlineAndCompile;
  
  var ErrorReporter = traceur.util.ErrorReporter;
  var TreeWriter = traceur.outputgeneration.TreeWriter;
  
  var ext = '.traceur-compiled';
  
  Module._extensions[ext] = function(module, filename) {
    module.filename = filename.slice(0, -ext.length);
    module._compile(module.compiledCode, module.filename);
  };
  
  function interpret(filename, argv, flags) {
    var reporter = new ErrorReporter();
    var execArgv = [require.main.filename].concat(flags || []);
  
    filename = fs.realpathSync(filename);
    process.argv = ['traceur', filename].concat(argv || []);
    process.execArgv = process.execArgv.concat(execArgv);
  
    inlineAndCompile([filename], {}, reporter, function(tree) {
      var module = new Module(filename, require.main);
  
      module.compiledCode = TreeWriter.write(tree);
      module.load(filename + ext);
    }, function(err) {
      console.error(err);
      process.exit(1);
    });
  }
  
  module.exports = interpret;
  
subject: Fix paths issue with modules in 'node_modules'.