[Haskell-beginners] Ignore in import

[Imants Cekusins]

> Duplicate instance declarations:

it appears that there is (or was?) no way to hide instance definitions:

https://mail.haskell.org/pipermail/haskell-cafe/2009-July/063842.html

however looking at the exercise:

"... implement Functor instances for Either e, ((,) e), and
((->) e).”

does this not suggest

1) instance Functor Either e, ((,) e)
and
2) instance Functor Either e, ((->) e)

?