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tcfail208.hs:4:19: error:
• Could not deduce (Eq (m a)) arising from a use of ‘==’
from the context: (Monad m, Eq a)
bound by the type signature for:
f :: forall (m :: * -> *) a. (Monad m, Eq a) => a -> m a -> Bool
at tcfail208.hs:3:1-40
• In the expression: return x == y
In an equation for ‘f’: f x y = (return x == y)
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