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{-# LANGUAGE TemplateHaskell, FlexibleInstances, MultiParamTypeClasses,
UndecidableInstances, OverlappingInstances, CPP #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
-- This is a module full of orphans, so don't warn about them
module T1735_Help.Instances () where
import T1735_Help.Basics
import Data.Typeable
charType :: DataType
charType = mkStringType "Prelude.Char"
instance Sat (ctx Char) =>
Data ctx Char where
toConstr _ x = mkStringConstr charType [x]
gunfold _ _ z c = case constrRep c of
(StringConstr [x]) -> z x
_ -> error "gunfold Char"
dataTypeOf _ _ = charType
nilConstr :: Constr
nilConstr = mkConstr listDataType "[]" [] Prefix
consConstr :: Constr
consConstr = mkConstr listDataType "(:)" [] Infix
listDataType :: DataType
listDataType = mkDataType "Prelude.[]" [nilConstr,consConstr]
instance (Sat (ctx [a]), Data ctx a) =>
Data ctx [a] where
gfoldl _ _ z [] = z []
gfoldl _ f z (x:xs) = z (:) `f` x `f` xs
toConstr _ [] = nilConstr
toConstr _ (_:_) = consConstr
gunfold _ k z c = case constrIndex c of
1 -> z []
2 -> k (k (z (:)))
_ -> error "gunfold List"
dataTypeOf _ _ = listDataType
dataCast1 _ f = gcast1 f
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