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{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Polymorphism where
foo :: a -> a -> a
foo = undefined
foo' :: forall a. a -> a -> a
foo' = undefined
bar :: a -> b -> (a, b)
bar = undefined
bar' :: forall a b. a -> b -> (a, b)
bar' = undefined
baz :: a -> (a -> [a -> a] -> b) -> b
baz = undefined
baz' :: forall a b. a -> (a -> [a -> a] -> b) -> b
baz' = undefined
quux :: a -> (forall a. a -> a) -> a
quux x f = f x
quux' :: forall a. a -> (forall a. a -> a) -> a
quux' x f = f x
num :: Num a => a -> a -> a
num = undefined
num' :: forall a. Num a => a -> a -> a
num' = undefined
eq :: (Eq a, Eq b) => [a] -> [b] -> (a, b)
eq = undefined
eq' :: forall a b. (Eq a, Eq b) => [a] -> [b] -> (a, b)
eq' = undefined
mon :: Monad m => (a -> m a) -> m a
mon = undefined
mon' :: forall m a. Monad m => (a -> m a) -> m a
mon' = undefined
norf :: a -> (forall a. Ord a => a -> a) -> a
norf x f = x
norf' :: forall a. a -> (forall a. Ord a => a -> a) -> a
norf' x f = x
plugh :: forall a. a -> a
plugh x = x :: a
thud :: forall a b. (a -> b) -> a -> (a, b)
thud f x =
(x :: a, y) :: (a, b)
where
y = (f :: a -> b) x :: b
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