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-rw-r--r--contrib/dp/fol.mli2
1 files changed, 1 insertions, 1 deletions
diff --git a/contrib/dp/fol.mli b/contrib/dp/fol.mli
index a85469cc6..5347a86f2 100644
--- a/contrib/dp/fol.mli
+++ b/contrib/dp/fol.mli
@@ -45,4 +45,4 @@ type query = decl list * form
(* prover result *)
-type prover_answer = Valid | Invalid | DontKnow | Timeout
+type prover_answer = Valid of string option | Invalid | DontKnow | Timeout