[1mMain.hs:7.15:[1;31m error:[0m[1m
   • Data family instance 'F Int' overlaps previous instance 'F a'
  [1;34m|[0m
[1;34m7[0m [1;34m| [0mdata instance [1;31mF[0m Int = MkInt Int
  [1;34m|[0m               [1;31m^[0m

