anchor.diff:  It has an option `-v` that can be specified multiple times to increase verbosity.
   The `MyLogger` class also provides some methods like `debug` and `trace` that can be used to print messages to the standard error stream.
   
  -[source,java]
  +.Java
  +[source,java,role="primary"]
   ----
   public class MyLogger {
   
  
positive.code: }
  ----
  
  An application could use the mixin like this:
  
  [source,java]
  ----
  class MyApp implements Runnable {
  
  
negative.code: assert mixin.verbosity.length == 3;
  ----
  
  .Kotlin
  [source,kotlin,role="secondary"]
  ----
  commandLine.parseArgs("-vvv")
  
  // the options defined in ReusableOptions have been added to the zip command
  assert(mixin === commandLine.mixins["myMixin"])
  assert(mixin.verbosity.size == 3)
  ----
  
  === Use Case: Configure Log Level with a Global Option
  
  