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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 50ae66eb0e..ce570ee127 100644
--- a/pretyping/typeclasses.ml
+++ b/pretyping/typeclasses.ml
@@ -300,6 +300,7 @@ let build_subclasses ~check env sigma glob pri =
| Some (Backward, _) -> None
| Some (Forward, pri') ->
let proj = Option.get proj in
+ let rels = List.map (fun d -> Termops.map_rel_decl EConstr.Unsafe.to_constr d) rels 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