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

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akhesaCaro 2021-03-23 14:09:49 +01:00
parent 0743ca724d
commit ba379287c8
1 changed files with 4 additions and 6 deletions
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10
doc/cookbook/uverb/UVerb.lhs
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@ -10,6 +10,8 @@ handlers that respond with arbitrary open unions of types.
{-# LANGUAGE ConstraintKinds #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE DerivingVia #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
@ -154,12 +156,8 @@ Example usage:
```haskell
data Foo = Foo Int Int Int
deriving (Show, Eq, GHC.Generic)
instance ToJSON Foo
instance HasStatus Foo where
type StatusOf Foo = 200
deriving (Show, Eq, GHC.Generic, ToJSON)
deriving HasStatus via WithStatus 200 Foo
data Bar = Bar
deriving (Show, Eq, GHC.Generic)