anchor.diff:            | .foo label
         +div(class="__after")
           label.span
  -          | label.span
  +          | .foo label.span
         +bem(false)
   
       hr
  
positive.code:           | .foo address
        +div(class="__after")
          address.div
            | address.div
        +bem(false)
  
      hr
  
negative.code:           | .foo a
        +div(class="__after")
          a(href="#").span
            | .foo a.span
        +bem(false)
  
      hr
  