error

src/Data/Diff.hs:118:10: error:
    • Could not deduce (Flat (V2 (Maybe (Diff a))))
        arising from a use of ‘Data.Flat.Class.$dmencode’
      from the context: Flat (Diff a)
        bound by the instance declaration at src/Data/Diff.hs:118:10-44
    • In the expression: Data.Flat.Class.$dmencode @Diff (V2 a)
      In an equation for ‘encode’:
          encode = Data.Flat.Class.$dmencode @Diff (V2 a)
      In the instance declaration for ‘Flat (Diff (V2 a))’

src/Data/Diff.hs:118:10: error:
    • Could not deduce (Flat (V2 (Maybe (Diff a))))
        arising from a use of ‘Data.Flat.Class.$dmdecode’
      from the context: Flat (Diff a)
        bound by the instance declaration at src/Data/Diff.hs:118:10-44
    • In the expression: Data.Flat.Class.$dmdecode @Diff (V2 a)
      In an equation for ‘decode’:
          decode = Data.Flat.Class.$dmdecode @Diff (V2 a)
      In the instance declaration for ‘Flat (Diff (V2 a))’

src/Data/Diff.hs:118:10: error:
    • Could not deduce (Flat (V2 (Maybe (Diff a))))
        arising from a use of ‘Data.Flat.Class.$dmsize’
      from the context: Flat (Diff a)
        bound by the instance declaration at src/Data/Diff.hs:118:10-44
    • In the expression: Data.Flat.Class.$dmsize @Diff (V2 a)
      In an equation for ‘size’:
          size = Data.Flat.Class.$dmsize @Diff (V2 a)
      In the instance declaration for ‘Flat (Diff (V2 a))’