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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 d67dceeac..566b2b8b0 100644
--- a/plugins/firstorder/formula.ml
+++ b/plugins/firstorder/formula.ml
@@ -12,6 +12,7 @@ open Term
open Termops
open Reductionops
open Tacmach
+open Errors
open Util
open Declarations
open Libnames