[Haskell-cafe] Re: Can't make a derived instance of `Typeable (A B)': `A' has arguments of kind other than `*'

[Christopher Done]

Just for what it's worth, the following does work:

newtype AMaybe = AMaybe { unMaybe :: A Maybe }
deriving instance Typeable AMaybe

Which leads me to be kind of baffled by the above error message.