code: func (f *Feature) LongestLine() int {
  	if f.longestLine == 0 {
  		f.longestLine = len("Feature: " + f.Title)
  		for _, s := range f.Scenarios {
  			if l := s.LongestLine(); l > f.longestLine {
  				f.longestLine = l
  			}
  		}
  	}
  	return f.longestLine
  }
docs: // LongestLine returns the longest step line in a feature.