Support more language extensions for persistent

Recent persistent requires more language extensions to generate
entities. Turn them on where appropriate.

1 files changed, 3 insertions, 1 deletions

diff --git a/Database/Export.hs b/Database/Export.hs
index a41048993..bc4e268b2 100644
--- a/Database/Export.hs
+++ b/Database/Export.hs
@@ -1,6 +1,7 @@
 {- Sqlite database used for exports to special remotes.
  -
  - Copyright 2017 Joey Hess <id@joeyh.name>
+ - Copyright 2022 Benjamin Barenblat <bbarenblat@gmail.com>
  -:
  - Licensed under the GNU GPL version 3 or higher.
  -}
@@ -8,7 +9,8 @@
 {-# LANGUAGE QuasiQuotes, TypeFamilies, TemplateHaskell #-}
 {-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
 {-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE RankNTypes, DerivingStrategies, StandaloneDeriving #-}
+{-# LANGUAGE UndecidableInstances, DataKinds, FlexibleInstances #-}
 {-# LANGUAGE CPP #-}
 
 module Database.Export (