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-rw-r--r--pretyping/typeclasses.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/pretyping/typeclasses.ml b/pretyping/typeclasses.ml
index 478499d91..93c71e6ea 100644
--- a/pretyping/typeclasses.ml
+++ b/pretyping/typeclasses.ml
@@ -303,6 +303,7 @@ let build_subclasses ~check env sigma glob { hint_priority = pri } =
| Some (Forward, info) ->
let proj = Option.get proj in
let rels = List.map (fun d -> Termops.map_rel_decl EConstr.Unsafe.to_constr d) rels in
+ let u = EConstr.EInstance.kind sigma u in
let body = it_mkLambda_or_LetIn (mkApp (mkConstU (proj,u), projargs)) rels in
if check && check_instance env sigma (EConstr.of_constr body) then None
else