Turn on UndecidableInstances in test file.

Since newer GHC is stricter about undecidable instances.
This commit is contained in:
Mathieu Boespflug 2019-03-20 14:49:36 +01:00
parent 9bc2f9e33d
commit dcb28d9df2

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@ -6,6 +6,7 @@
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}