AMP breaks `haskell2010` package
(and probably also haskell98)
I hate to be the one pointing this out, but the AMP has one ugly side-effect:
As of now, GHC HEAD rejects Haskell2010 programs (which know nothing about the Applicative class). Moreover, there's no simple way to access the Applicative class in order to write an instance to satisfy non-standard superclass requirement, so it's impossible to define custom Monad instances.
For instance, consider the following session which worked in GHC 7.6.3 (albeit with an AMP warning):
$ inplace/bin/ghc-stage2 --interactive -XHaskell2010 -hide-all-packages -package haskell2010
GHCi, version 7.9.20140914: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim-0.3.1.0 ... linking ... done.
Loading package integer-gmp-0.5.1.0 ... linking ... done.
Loading package base-4.8.0.0 ... linking ... done.
Loading package array-0.5.0.1 ... linking ... done.
Loading package haskell2010-1.1.2.1 ... linking ... done.
λ:2> data Identity a = Identity a
data Identity a = Identity a
λ:3> instance Monad Identity
<interactive>:3:10:
No instance for (base-4.8.0.0:GHC.Base.Applicative Identity) arising from the superclasses of an instance declaration
In the instance declaration for ‘Monad Identity’
λ:4> :info Monad
class base-4.8.0.0:GHC.Base.Applicative m => Monad (m :: * -> *) where
(>>=) :: m a -> (a -> m b) -> m b
(>>) :: m a -> m b -> m b
return :: a -> m a
fail :: String -> m a
-- Defined in ‘base-4.8.0.0:GHC.Base’
instance Monad (Either e) -- Defined in ‘base-4.8.0.0:Data.Either’
instance Monad Maybe -- Defined in ‘base-4.8.0.0:Data.Maybe’
instance Monad [] -- Defined in ‘base-4.8.0.0:GHC.Base’
instance Monad IO -- Defined in ‘base-4.8.0.0:GHC.Base’
instance Monad ((->) r) -- Defined in ‘base-4.8.0.0:GHC.Base’
λ:5>