Fix warnings in tests

Author: OlivierNicole

compiler/tests-jsoo/lib-effects/assume_no_perform.ml

@@ -6,13 +6,6 @@ module type TREE = sig
   type 'a t
   (** The type of tree. *)
 
-  val leaf : 'a t
-  (** A tree with only a leaf. *)
-
-  val node : 'a t -> 'a -> 'a t -> 'a t
-  (** [node l x r] constructs a new tree with a new node [x] as the value, with
-      [l] and [r] being the left and right sub-trees. *)
-
   val deep : int -> int t
   (** [deep n] constructs a tree of depth n, in linear time, where every node at
       level [l] has value [l]. *)
@@ -120,7 +113,7 @@ let benchmark f n =
 
 (* Main follows *)
 
-type _ Effect.t += Dummy : unit t
+type _ Effect.t += Dummy : unit t [@@warning "-38"]
 
 let () =
   try_with

compiler/tests-jsoo/lib-effects/assume_no_perform_unhandled.ml

@@ -1,4 +1,3 @@
-open Printf
 open Effect
 open Effect.Deep