anchor.diff:  This produces the following usage help:
   ----
   Usage: <main class> [-a=<optionA>] [-b=<optionB>] [-c=<optionC>] [-d=<optionD>]
  -  -a= <optionA>               ALWAYS shown even if null
  -                                Default: null
  -  -b= <optionB>               NEVER shown
  -  -c= <optionC>               ON_DEMAND hides null
  -  -d= <optionD>               ON_DEMAND shows non-null
  -                                Default: abc
  +  -a= <optionA>   ALWAYS shown even if null
  +                    Default: null
  +  -b= <optionB>   NEVER shown
  +  -c= <optionC>   ON_DEMAND hides null
  +  -d= <optionD>   ON_DEMAND shows non-null
  +                    Default: abc
   ----
   
   === Required-Option Marker
  
positive.code: Produces the following usage help message:
  ----
  Usage: <main class> [OPTIONS]
    -a, --alpha=<alpha>         optional alpha
  * -b, --beta=<beta>           mandatory beta
  ----
  
  === Usage Width
  
negative.code: Git is a fast, scalable, distributed revision control system with an unusually
  rich command set that provides both high-level operations and full access to
  internals.
        --git-dir=<gitDir>   Set the path to the repository.
    -h, --help               Show this help message and exit.
    -V, --version            Print version information and exit.
  
  Commands:
  
  