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-rw-r--r--pretyping/typeclasses.mli2
1 files changed, 1 insertions, 1 deletions
diff --git a/pretyping/typeclasses.mli b/pretyping/typeclasses.mli
index 69a472cb51..e4db68fbcd 100644
--- a/pretyping/typeclasses.mli
+++ b/pretyping/typeclasses.mli
@@ -73,7 +73,7 @@ val is_implicit_arg : hole_kind -> bool
(** Returns the term and type for the given instance of the parameters and fields
of the type class. *)
-val instance_constructor : typeclass -> constr list -> constr * types
+val instance_constructor : typeclass -> constr list -> constr option * types
(** Resolvability.
Only undefined evars could be marked or checked for resolvability. *)