anchor.diff:  for the unit tests, which must be made available via the Git submodule
   mechanism:
   
  +[source, sh]
   -------------------------------------------------------------------------------
   $ git submodule init
   $ git submodule update
  
positive.code: 
  The next mandatory step is of course to display the famous greeting:
  
  -------------------------------------------------------------------------------
  $ t2-output/macosx-gcc-debug-default/HelloWorld
  hello, world
  
negative.code: needs to be added)
  
  .Rust build.rs Synopsis
  -------------------------------------------------------------------------------
  use std::env;
  
  