code: func quoteString(s string) string {
  	var q = make([]rune, 1, len(s)+10)
  	q[0] = '\''
  	for _, ch := range s {
  		if seq, ok := escapes[ch]; ok {
  			q = append(q, '\\', seq)
  			continue
  		}
  		q = append(q, ch)
  	}
  	return string(append(q, '\''))
  }
docs: // quoteString quotes the given string with single quotes, according to the Soy
  // spec for string literals.