anchor.diff:       printable_range,
        io_lib_print_binary_depth_one, otp_10302, otp_10755, otp_10836,
        io_lib_width_too_small, io_with_huge_message_queue,
  -     format_string].
  +     format_string, maps].
   
   groups() -> 
       [].
  
positive.code:     "xxxxxxsssx" = fmt("~10.4.xs", ["sss"]),
      "xxxxxxsssx" = fmt("~10.4.*s", [$x, "sss"]),
      ok.
  
negative.code: 	 printable_range/1,
  	 io_lib_print_binary_depth_one/1, otp_10302/1, otp_10755/1,
           otp_10836/1, io_lib_width_too_small/1,
           io_with_huge_message_queue/1, format_string/1,
  	 maps/1]).
  
  -export([pretty/2]).
  
  