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-rw-r--r--plugins/firstorder/formula.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/plugins/firstorder/formula.ml b/plugins/firstorder/formula.ml
index 9900792ca..314a2b2f9 100644
--- a/plugins/firstorder/formula.ml
+++ b/plugins/firstorder/formula.ml
@@ -6,6 +6,7 @@
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
+open API
open Hipattern
open Names
open Term