docs: function() {
      var tok = this.scan(/^extends?(?= |$|\n)/, 'extends');
      if (tok) {
        this.tokens.push(tok);
        if (!this.callLexerFunction('path')) {
          this.error('NO_EXTENDS_PATH', 'missing path for extends');
        }
        return true;
      }
      if (this.scan(/^extends?\b/)) {
        this.error('MALFORMED_EXTENDS', 'malformed extends');
      }
    }