anchor.diff:  example...
   
   [source,c]
  ------------------------------
  +--------------------------
   #include <cgreen/cgreen.h>
   #include <stdlib.h>
   #include <mysql/mysql.h>
  
positive.code: Firstly we need to remove the 'main()' calls.  E.g...
  
  [source,c]
  -----------------------------
  #include <cgreen/cgreen.h>
  #include <string.h>
  
  
negative.code: }
  -----------------------------
  
  When built and run, this gives...
  
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