[1mMain.hs:8.15:[1;31m error:[0m[1m
   • Can't declare non-associated data instance for data family 'D' associated
     with class 'C'
  [1;34m|[0m
[1;34m8[0m [1;34m| [0mdata instance [1;31mD[0m Tag = MkD Tag
  [1;34m|[0m               [1;31m^[0m

