docs: function ConfigError(lineno, line, file, err) {
    this.name = ConfigError.name;
    Error.call(this);
  
    var fmt = '*** FATAL CONFIG FILE ERROR ***%s';
    fmt += 'Reading the configuration file, at line %s%s';
    fmt += '>>> %s%s';
    fmt += err && err.message && !(err instanceof TypeDefError) ? err.message :
      'Bad directive or wrong number of arguments';
  
    this.message = util.format(fmt, EOL, lineno, EOL, line, EOL);
    this.file = file;
    this.err = err;
  }