On 24 Oct 2015, at 16:25, Ryan Trinkle <ryan.trinkle@gmail.com> wrote:

For the purpose of learning the material, it might be easiest to just write:

class MyFunctor f where

  myFmap :: (a -> b) -> f a -> f b

and then create instances of that, instead.

This way, you won't have any conflicts with existing instances.

On Sat, Oct 24, 2015 at 10:16 AM, Petr Vápenka <petr.vapenka@gmail.com> wrote:

You can try NoImplicitPrelude language extension (this may not work, too) or use newtype wrappers or normal data types with the same shape.

Dne 24.10.2015 16:05 napsal uživatel "Imants Cekusins" <imantc@gmail.com>:

> I think its functor for each of ...

sorry, you are right.

well maybe it is possible with a non-ghc compiler?
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