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FD1.hs:16:1: error:
• Couldn't match expected type ‘Int -> Int’ with actual type ‘a’
‘a’ is a rigid type variable bound by
the type signature for:
plus :: forall a. E a (Int -> Int) => Int -> a
at FD1.hs:15:9
• The equation(s) for ‘plus’ have two arguments,
but its type ‘Int -> a’ has only one
• Relevant bindings include plus :: Int -> a (bound at FD1.hs:16:1)
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