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-rw-r--r--plugins/ring/ring.ml1
1 files changed, 0 insertions, 1 deletions
diff --git a/plugins/ring/ring.ml b/plugins/ring/ring.ml
index 1e3765da6c..fdf3a9bd9d 100644
--- a/plugins/ring/ring.ml
+++ b/plugins/ring/ring.ml
@@ -21,7 +21,6 @@ open Reductionops
open Tacticals
open Tacexpr
open Tacmach
-open Proof_trees
open Printer
open Equality
open Vernacinterp