anchor.diff:  ----
   When using the `@Mixin` annotation, the command can reference the mixed-in object directly (for example, the `MyCommand` can reference its `myMixin` field to access the `ReusableOptions` object.
   
  +[source,java]
  +----
  +MyCommand zip = new MyCommand();
  +CommandLine commandLine = new CommandLine(zip);
  +
  +// the options defined in ReusableOptions have been added to the zip command
  +commandLine.parse("-vvv");
  +assert zip.myMixin.verbosity.length == 3;
  +----
  +
   Mixins added with the `@Mixin` annotation can also be accessed via the map returned by `CommandLine.getMixins`.
   
   
   === Reuse Combinations
   
  -Mixins can be nested. There is no limitation to how deeply mixins can be nested. A mixin may also inherit options, positional parameters and command attributes from a super class.
  +The above mechanisms can be combined in any way. Mixins can be nested, and there is no limitation to how deeply mixins can be nested. A mixin may also inherit options, positional parameters and command attributes from a super class.
   
   An option with the same name should not be defined multiple times or a `DuplicateOptionAnnotationsException` is thrown during initialization. Positional parameters for the same position may be defined multiple times, they can co-exist.
   
  
positive.code: ----
  
  == Reuse
  Your application may have options or usage help attributes that are common to all commands.
  To reduce duplication you may want to reuse such options and attributes. Picocli supports both inheritance and composition for reuse.
  
  Let's take some example options and attributes and see how to reuse them. For example:
  
  [source,java]
  ----
  
negative.code: ----
  
  === Programmatic Mixin
  Picocli 3.0 introduces the concept of "mixins". Mixins are a convenient alternative to subclassing. Common options, positional parameters or command attributes defined in a separate class can be reused in other commands, either programmatically with the `CommandLine.addMixin` method, or declaratively with the `@Mixin` annotation.
  
  The below example shows how a mixin can be added programmatically with the `CommandLine.addMixin` method:
  
  