From cc7503a917e92d3e5aaf4b4f8c9b68e515b09892 Mon Sep 17 00:00:00 2001
From: rocket <gamingdas@gmail.com>
Date: Sun, 12 Sep 2021 11:42:56 +0300
Subject: [PATCH] (#1573) Added wildcards to `Threads` ctor.

---
 src/main/java/org/cactoos/experimental/Threads.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/cactoos/experimental/Threads.java b/src/main/java/org/cactoos/experimental/Threads.java
index 9942341e59..af2b0cff38 100644
--- a/src/main/java/org/cactoos/experimental/Threads.java
+++ b/src/main/java/org/cactoos/experimental/Threads.java
@@ -188,7 +188,7 @@ public Threads(
      * @param tasks The tasks to be executed concurrently.
      */
     private Threads(
-        final Func<Iterable<Callable<T>>, Iterable<Future<T>>> fnc,
+        final Func<? super Iterable<Callable<T>>, ? extends Iterable<? extends Future<T>>> fnc,
         final Iterable<? extends Scalar<? extends T>> tasks
     ) {
         super(