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diff --git a/src/VeriFuzz/Sim/Env.hs b/src/VeriFuzz/Sim/Env.hs
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+{-|
+Module      : VeriFuzz.Sim.Env
+Description : Environment to run the simulator and synthesisers in a matrix.
+Copyright   : (c) 2019, Yann Herklotz
+License     : GPL-3
+Maintainer  : ymherklotz [at] gmail [dot] com
+Stability   : experimental
+Portability : POSIX
+
+Environment to run the simulator and synthesisers in a matrix.
+-}
+
+module VeriFuzz.Sim.Env
+    ( SynthTool(..)
+    , SimTool(..)
+    , SimEnv(..)
+    , SynthEnv(..)
+    )
+where
+
+import           Prelude               hiding (FilePath)
+import           Shelly
+import           VeriFuzz.Sim.Icarus
+import           VeriFuzz.Sim.Internal
+import           VeriFuzz.Sim.XST
+import           VeriFuzz.Sim.Yosys
+
+data SynthTool = XSTSynth {-# UNPACK #-} !XST
+               | YosysSynth {-# UNPACK #-} !Yosys
+               deriving (Eq, Show)
+
+instance Tool SynthTool where
+    toText (XSTSynth xst)     = toText xst
+    toText (YosysSynth yosys) = toText yosys
+
+instance Synthesisor SynthTool where
+    runSynth (XSTSynth xst)     = runSynth xst
+    runSynth (YosysSynth yosys) = runSynth yosys
+
+newtype SimTool = IcarusSim Icarus
+                deriving (Eq, Show)
+
+instance Tool SimTool where
+    toText (IcarusSim icarus) = toText icarus
+
+instance Simulator SimTool where
+    runSim (IcarusSim icarus) = runSim icarus
+    runSimWithFile (IcarusSim icarus) = runSimWithFile icarus
+
+data SimEnv = SimEnv { simTools :: [SimTool]
+                     , simDir   :: FilePath
+                     }
+
+data SynthEnv = SynthEnv { synthTools :: [SynthTool]
+                         , synthDir   :: FilePath
+                         }
+
+