anchor.diff:  simply invoke it as follows:
   
   [source,console]
  -----------------------------------
  +----
   $ gologolo samples/helloworld.golo
   Hello world!
   $
  -----------------------------------
  +----
   
   `gologolo` takes several Golo source files as input. It expects the last
   one to have a `main` function to call. The Golo code is compiled on the
  
positive.code: Compiling Golo files is straightforward:
  
  [source,console]
  -----------------------------------------------
  $ goloc -output classes samples/helloworld.golo
  $
  -----------------------------------------------
  
  This compiles the code found in `samples/helloworld.golo` and outputs
  the generated classes to a `classes` folder (it will be created if
  needed):
  
  [source,console]
  -------------------
  $ tree classes/
  classes/
  └── hello
  
negative.code: as follows:
  
  [source,text]
  ----
  module EchoArgs
  
  function main = |args| {
  