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tcfail208.hs:4:19:
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 :: (Monad m, Eq a) => a -> m a -> Bool
at tcfail208.hs:3:6-40
In the expression: (return x == y)
In an equation for `f': f x y = (return x == y)
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