anchor.diff:  -----
   
   
  -GC Principles: References Count
  --------------------------------
  +(Too) simple solution: References Counting
  +------------------------------------------
   
   ...
   
  
positive.code: . Mark all _the rest_ as garbage
  
  
  GC Principles: References Count
  -------------------------------
  
  Counting the references to an object may easily be automated.
  
  [graphviz,,fdp]
  -----
  
negative.code: -----
  
  
  (Too) simple solution: References Counting
  ------------------------------------------
  
  But:
  
  