error on GHC 8.8+. Should this bit be removed?

I'd say it should be put under a suitable #if conditional. (For the sake of developers who wish to support many GHC versions.) On 2020-02-07 03:47, Artem Pelenitsyn wrote:

Hello,

The fail package [1] lists libraries@haskell.org mailto:libraries@haskell.org as maintainer's address, so I'm writing here. The documentation for the single module in the package claims:

This module can be imported for defining forward compatible MonadFail instances:

import qualified Control.Monad.Fail as Fail

instance Monad Foo where   (>>=) = {- ...bind impl... -}

  -- Provide legacy fail implementation for when   -- new-style MonadFail desugaring is not enabled.   fail = Fail.fail   ...

But defining the fail method inside a Monad instance will produce an error on GHC 8.8+. Should this bit be removed?

-- Best, Artem

[1]: http://hackage.haskell.org/package/fail

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