title: Getting a FileSystemException when reading text file
body: <p>I'm trying to read a text file in Dart as a command line application:</p>
  
  <pre><code>void readFile(){
    var file = new File('data.txt');
    file.readAsLines(encoding: ASCII).then((lines) {
      print(lines);
    }).catchError(print);
  }
  </code></pre>
  
  <p>I keep getting this error:</p>
  
  <pre><code>FileSystemException: Failed to decode data using encoding 'us-ascii', path = data.txt
  </code></pre>
  
  <p>Changing to UTF8 yields a similar error</p>