data TisanInteger = Tisan Integer
instance Eq (Tisan Integer) where (Tisan v) == (Tisan v') = v == v'
prelude>
Instance_testen.hs:7:14: error:
Not in scope: type constructor or class ‘Tisan’
A data constructor of that name is in scope; did you mean DataKinds?
|
7 | instance Eq (Tisan Integer) where (Tisan v) == (Tisan v') = v == v' | ^^^^^
[1 of 1] Compiling Main ( Instance_testen.hs, interpreted )
Failed, no modules loaded.
what am i doing wrong?