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waddlaw/Ins.hs

Last active August 11, 2018 11:00
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Ins.hs
{-# LANGUAGE TemplateHaskell #-}
module Ins where
import Language.Haskell.TH
import Language.Haskell.TH.Syntax
standAloneDerivingShow :: Name -> DecsQ
standAloneDerivingShow n = return [StandaloneDerivD Nothing [] (AppT (ConT ''Show) (ConT n))]
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Lib.hs
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE StandaloneDeriving #-}
module Lib where
import Ins
data A = A
standAloneDerivingShow ''A
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