code: func Dedent(text string) string {
  	var margin string
  
  	text = whitespaceOnly.ReplaceAllString(text, "")
  	indents := leadingWhitespace.FindAllStringSubmatch(text, -1)
  
  	// Look for the longest leading string of spaces and tabs common to all
  	// lines.
  	for i, indent := range indents {
  		if i == 0 {
  			margin = indent[1]
  		} else if strings.HasPrefix(indent[1], margin) {
  			// Current line more deeply indented than previous winner:
  			// no change (previous winner is still on top).
  			continue
  		} else if strings.HasPrefix(margin, indent[1]) {
  			// Current line consistent with and no deeper than previous winner:
  			// it's the new winner.
  			margin = indent[1]
  		} else {
  			// Current line and previous winner have no common whitespace:
  			// there is no margin.
  			margin = ""
  			break
  		}
  	}
  
  	if margin != "" {
  		text = regexp.MustCompile("(?m)^"+margin).ReplaceAllString(text, "")
  	}
  	return text
  }
docs: // Dedent removes any common leading whitespace from every line in text.
  //
  // This can be used to make multiline strings to line up with the left edge of
  // the display, while still presenting them in the source code in indented
  // form.