ba37928 · typeable/servant

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reverting : removing DerivingVia extension (not compatible ghc < 8.6.1)

ba37928akhesaCaro6 years ago

doc/cookbook/uverb/UVerb.lhs+4−6

@@ -10,6 +10,8 @@ handlers that respond with arbitrary open unions of types.

10{-# LANGUAGE ConstraintKinds #-}

11{-# LANGUAGE DataKinds #-}

12{-# LANGUAGE DeriveGeneric #-}

13+{-# LANGUAGE DerivingStrategies #-}

14+{-# LANGUAGE DerivingVia #-}

13{-# LANGUAGE FlexibleContexts #-}

15{-# LANGUAGE FlexibleContexts #-}

14{-# LANGUAGE FlexibleInstances #-}

16{-# LANGUAGE FlexibleInstances #-}

15{-# LANGUAGE GeneralizedNewtypeDeriving #-}

17{-# LANGUAGE GeneralizedNewtypeDeriving #-}

@@ -154,12 +156,8 @@ Example usage:

154

156

155```haskell

157```haskell

156data Foo = Foo Int Int Int

158data Foo = Foo Int Int Int

157− deriving (Show, Eq, GHC.Generic)

159+ deriving (Show, Eq, GHC.Generic, ToJSON)

158−

160+ deriving HasStatus via WithStatus 200 Foo

159−instance ToJSON Foo

160−

161−instance HasStatus Foo where

162− type StatusOf Foo = 200

163

161

164data Bar = Bar

162data Bar = Bar

165 deriving (Show, Eq, GHC.Generic)

163 deriving (Show, Eq, GHC.Generic)