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-rw-r--r--plugins/firstorder/instances.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/plugins/firstorder/instances.ml b/plugins/firstorder/instances.ml
index 12b2304ac..4b15dcae5 100644
--- a/plugins/firstorder/instances.ml
+++ b/plugins/firstorder/instances.ml
@@ -11,6 +11,7 @@ open Rules
open Errors
open Util
open Term
+open Vars
open Glob_term
open Tacmach
open Tactics