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-rw-r--r--contrib/dp/fol.mli9
1 files changed, 8 insertions, 1 deletions
diff --git a/contrib/dp/fol.mli b/contrib/dp/fol.mli
index a85469cc..b94bd3e3 100644
--- a/contrib/dp/fol.mli
+++ b/contrib/dp/fol.mli
@@ -45,4 +45,11 @@ type query = decl list * form
(* prover result *)
-type prover_answer = Valid | Invalid | DontKnow | Timeout
+type prover_answer =
+ | Valid of string option
+ | Invalid
+ | DontKnow
+ | Timeout
+ | NoAnswer
+ | Failure of string
+