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-rw-r--r--src/Verismith/Tool/Internal.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Verismith/Tool/Internal.hs b/src/Verismith/Tool/Internal.hs
index b97c2f1..dfa3f46 100644
--- a/src/Verismith/Tool/Internal.hs
+++ b/src/Verismith/Tool/Internal.hs
@@ -75,7 +75,7 @@ class Tool a => Simulator a where
-> ResultSh ByteString
data Failed = EmptyFail
- | EquivFail CounterEg
+ | EquivFail (Maybe CounterEg)
| EquivError
| SimFail ByteString
| SynthFail