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T5095.hs:9:11: error:
Overlapping instances for Eq a arising from a use of ‘==’
Matching instances:
instance [overlappable] Show a => Eq a -- Defined at T5095.hs:5:31
instance (Eq a, Eq b) => Eq (Either a b)
-- Defined in ‘Data.Either’
instance Eq All -- Defined in ‘Data.Monoid’
...plus 36 others
...plus one instance involving out-of-scope types
(use -fprint-potential-instances to see them all)
(The choice depends on the instantiation of ‘a’
To pick the first instance above, use IncoherentInstances
when compiling the other instance declarations)
In the expression: x == y
In an equation for ‘f’: f x y = x == y
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