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T17775-viewpats-b.hs:7:9: error:
• No instance for (Eq a) arising from a use of ‘==’
Possible fix:
add (Eq a) to the context of
the type signature for:
ex2 :: forall a. a -> a -> Int -> Eq a => Bool
• In the expression: (==)
In the expression: == x
In the pattern: (== x) -> result
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