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{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
{-# LANGUAGE ConstraintKinds, TemplateHaskell, PolyKinds, TypeFamilies, RankNTypes #-}
module T7021a where
import GHC.Prim
import Language.Haskell.TH
type IOable a = (Show a, Read a)
type family ALittleSilly :: Constraint
data Proxy a = Proxy
foo :: IOable a => a
foo = undefined
baz :: a b => Proxy a -> b
baz = undefined
bar :: ALittleSilly => a
bar = undefined
test :: Q Exp
test = do
Just fooName <- lookupValueName "foo"
Just bazName <- lookupValueName "baz"
Just barName <- lookupValueName "bar"
reify fooName
reify bazName
reify barName
[t| forall a. (Show a, (Read a, Num a)) => a -> a |]
[| \_ -> 0 |]
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