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-rw-r--r--plugins/firstorder/ground.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/plugins/firstorder/ground.ml b/plugins/firstorder/ground.ml
index 6c1709140..5133801ee 100644
--- a/plugins/firstorder/ground.ml
+++ b/plugins/firstorder/ground.ml
@@ -11,6 +11,7 @@ open Sequent
open Rules
open Instances
open Term
+open Vars
open Tacmach
open Tacticals