anchor.diff:  
   % -compile([export_all]).
   % -define(TEST, 1).
  -
   -ifdef(TEST).
   -include_lib("eunit/include/eunit.hrl").
   
  
positive.code:                 false ->
                      throw({invalid_key, Index})
              end;
          KeySpec ->
              case do_parse_config(KeySpec, Val) of
                  {ok, Val1} ->
  
negative.code:                 field12_b => integer
              },
          field13 => {list, atom},
          field14 => {update, map, map1, m_field14, integer},
          field15 => {update, map, map1, m_field15, atom},
          fieldXX => invalid
      },
  
  