anchor.diff:  function mul = |v| -> 10 * v
   ----
   
  -Several factory functions are available in `gololang.Decorators` to ease the
  -creation of checkers:
  +Several factory functions are available in 
  +link:./golodoc/gololang/Decorators[`gololang.Decorators`] to ease the creation 
  +of checkers:
   
   * `any` is a void checker that does nothing. It can used when you need to check
     only some arguments of a n-ary function.
  
positive.code: function double = |v| -> 2 * v
  ----
  
  or event
  
  [source, golo]
  ----
  
negative.code: Indeed, a decorated can execute code before delegating to the decorated
  function, of after the delegation.
  
  The module link:./golodoc/gololang/Decorators[`gololang.Decorators`] provide two
  decorators and several utility functions to check pre and post conditions.
  
  `checkResult` is a parametrized decorator taking a checker as parameter. It
  checks that the result of the decorated function is valid.
  