code: func (s *ListLiteral) String() string {
  	var buf bytes.Buffer
  	_, _ = buf.WriteString("(")
  	for idx, tagKey := range s.Vals {
  		if idx != 0 {
  			_, _ = buf.WriteString(", ")
  		}
  		_, _ = buf.WriteString(QuoteIdent(tagKey))
  	}
  	_, _ = buf.WriteString(")")
  	return buf.String()
  }
docs: // String returns a string representation of the literal.