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T5095.hs:9:11: error:
• Overlapping instances for Eq a arising from a use of ‘==’
Matching instance:
instance [overlappable] Show a => Eq a -- Defined at T5095.hs:5:31
Potentially matching instances:
instance Eq Ordering -- Defined in ‘GHC.Classes’
instance Eq a => Eq (Maybe a) -- Defined in ‘GHC.Maybe’
...plus 24 others
...plus six instances 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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