anchor.diff:  
   == volatile
   
  -[source]
  +[source,c++]
   ----
   static int foo;
   
  
positive.code: = C++ questions
  :toc: macro
  :language: c++
  
  toc::[]
  
  
negative.code:     
  == type traits/policy traits
  
  [source,c++]
  ----
  template<> 
  struct algorithm_selector< true > { 
  