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-rw-r--r--plugins/firstorder/instances.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/plugins/firstorder/instances.ml b/plugins/firstorder/instances.ml
index 44bdb585a..6c245063c 100644
--- a/plugins/firstorder/instances.ml
+++ b/plugins/firstorder/instances.ml
@@ -104,7 +104,7 @@ let mk_open_instance id idc gl m t=
let evmap=Refiner.project gl in
let var_id=
if id==dummy_id then dummy_bvid else
- let typ=pf_unsafe_type_of gl idc in
+ let typ=pf_unsafe_type_of gl (EConstr.of_constr idc) in
(* since we know we will get a product,
reduction is not too expensive *)
let (nam,_,_)=destProd (whd_all env evmap (EConstr.of_constr typ)) in