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-rw-r--r--src/Text/Pandoc/Free.hs5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/Text/Pandoc/Free.hs b/src/Text/Pandoc/Free.hs
index 12ab95898..33cb50c88 100644
--- a/src/Text/Pandoc/Free.hs
+++ b/src/Text/Pandoc/Free.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE DeriveFunctor #-}
+{-# LANGUAGE DeriveFunctor, DeriveDataTypeable #-}
{-
Copyright (C) 2016 Jesse Rosenthal <jrosenthal@jhu.edu>
@@ -90,6 +90,7 @@ import qualified System.FilePath.Glob as IO (glob)
import Control.Monad.State hiding (fail)
import Control.Monad.Reader hiding (fail)
import Data.Word (Word8)
+import Data.Typeable
data PandocActionF nxt =
LookupEnv String (Maybe String -> nxt)
@@ -219,7 +220,7 @@ data TestEnv = TestEnv { envEnv :: [(String, String)]
}
data TestException = TestException
- deriving (Show)
+ deriving (Show, Typeable)
instance E.Exception TestException