anchor.diff:  
   All transformers are called once, after the full command hierarchy is constructed, and before any command line arguments are parsed.
   
  -CAUTION: If your model transformer is declared as nested class, make sure you mark this class as `static`, or picocli will not be able to instantiate your transformer class without a <<Custom Factory>>.
  +CAUTION: If your model transformer is declared as nested class, make sure you mark this class as `static`, or picocli will not be able to instantiate your transformer class.
   
   === Automatic Parameter Indexes
   ==== Automatic Indexes
  
positive.code: }
  ----
  
  CAUTION: Make sure any nested classes are `static`, or picocli will not be able to instantiate them without a <<Custom Factory>>.
  
  With this preprocessor in place the user can now specify his editor of choice (e.g. `--open=idea`). If no editor is given, the default editor is used:
  
  
negative.code: }
  ----
  
  CAUTION: Make sure any nested classes are `static`, or picocli will not be able to instantiate them.
  
  [[IParameterPreprocessor_Parser_Plugin]]
  ==== `IParameterPreprocessor` Parser Plugin
  