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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 5eff2f277..1394f4764 100644
--- a/plugins/firstorder/instances.ml
+++ b/plugins/firstorder/instances.ml
@@ -107,7 +107,7 @@ let mk_open_instance id idc gl m t=
let typ=pf_unsafe_type_of gl idc in
(* since we know we will get a product,
reduction is not too expensive *)
- let (nam,_,_)=destProd (whd_betadeltaiota env evmap typ) in
+ let (nam,_,_)=destProd (whd_all env evmap typ) in
match nam with
Name id -> id
| Anonymous -> dummy_bvid in