anchor.diff:  mixin declare_class(name, ref)
  -    details
  +    details(open=true)
           summary
               a(name=ref)
                   span.declaration
  
positive.code: 
      p Most Lexeme attributes can be set, with the exception of the primary key, #[code orth]. Assigning to an attribute of the Lexeme object writes to the underlying struct, so all tokens that are backed by that Lexeme will inherit the new value.
  
      details
          summary: h4 String Features
          +LexemeStrings
      
      details
          summary: h4 Boolean Features
          +LexemeBooleans
  
      details
          summary: h4 Distributional Features
          +LexemeDistributional
  
  
negative.code: mixin summary
      block
  
  //mixin en_example
  //    pre.language-python: code
  //        include ../../code/api.example_war_and_peace
  
  mixin SeeAlso(name, link_target)
      a(href=link_target)
  