anchor.diff:  as follows:
   
   [source,text]
  -------------------------------------------------- 
  +----
   module EchoArgs
   
   function main = |args| {
  
positive.code:     println("#" + i + " -> " + aget(args, i))
    }
  }
  -------------------------------------------------
  
  We may invoke it as follows:
  
  [source,console]
  -----------------------------------------------------
  $ gologolo samples/echo-args.golo --args plop da plop
  #0 -> plop
  #1 -> da
  #2 -> plop
  $
  -----------------------------------------------------
  
  Note that `args` is expected to be an array, and we can use built-in
  functions to deal with it: `alength` gives the length of an array while
  
negative.code: 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
  