1 files changed, 3 insertions, 0 deletions
diff --git a/src/Test/VeriFuzz/Types.hs b/src/Test/VeriFuzz/Types.hs
index 3b17b8c..78fde7d 100644
--- a/src/Test/VeriFuzz/Types.hs
+++ b/src/Test/VeriFuzz/Types.hs
@@ -1,5 +1,6 @@
 module Test.VeriFuzz.Types where
 
+import           Data.Graph.Inductive
 import           System.Random
 import           Test.QuickCheck
 
@@ -8,6 +9,8 @@ data Gate = And
           | Xor
           deriving (Show, Eq, Enum, Bounded, Ord)
 
+newtype Circuit = Circuit { getCircuit :: Gr Gate () }
+
 instance Random Gate where
   randomR (a, b) g =
     case randomR (fromEnum a, fromEnum b) g of