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T4254.hs:19:10:
Could not deduce (b ~ Bool)
from the context (a ~ Int, FD a b)
bound by the type signature for
fails :: (a ~ Int, FD a b) => a -> Bool
at T4254.hs:19:1-11
`b' is a rigid type variable bound by
the type signature for fails :: (a ~ Int, FD a b) => a -> Bool
at T4254.hs:19:1
When using functional dependencies to combine
FD Int b,
arising from the type signature for
fails :: (a ~ Int, FD a b) => a -> Bool
at T4254.hs:19:1-11
FD Int Bool, arising from a use of `op' at T4254.hs:19:10-11
In the expression: op
In an equation for `fails': fails = op
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