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Monomorphism is the opposite of polymorphism. That is, a function is polymorphic if it works for several different types - and thus, a function is monomorphic if it works only for one type.As an example,
map :: (a -> b) -> [a] -> [b]
However, the function
foo :: (Int -> Int) -> [Int] -> [Int] foo = map
Perhaps you were looking for monomorphism restriction?