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-rw-r--r--src/Propellor/Types/Exception.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/Propellor/Types/Exception.hs b/src/Propellor/Types/Exception.hs
index 3a810d55..acefc9ec 100644
--- a/src/Propellor/Types/Exception.hs
+++ b/src/Propellor/Types/Exception.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+
module Propellor.Types.Exception where
import Data.Typeable