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-rw-r--r--plugins/firstorder/unify.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/plugins/firstorder/unify.ml b/plugins/firstorder/unify.ml
index 75fd0261a..e59f0419e 100644
--- a/plugins/firstorder/unify.ml
+++ b/plugins/firstorder/unify.ml
@@ -8,6 +8,7 @@
open Util
open Term
+open Vars
open Termops
open Reductionops