inspect() {
    var val = ' ' + inspect(this.val);
    return '[Token:' + this.lineno + ':' + this.column + ' '
      + '\x1b[32m' + this.type + '\x1b[0m'
      + '\x1b[33m' + (this.val ? val : '') + '\x1b[0m'
      + ']';
  }
Custom inspect.

@return {String}
@api public