From a2e87123499f6eef9c03089f61f174dd4b3cc673 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 13 Dec 2019 20:51:58 +0900
Subject: [PATCH] Fix visibility as module_function

---
 warning.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/warning.rb b/warning.rb
index 8361176491..224650d4ef 100644
--- a/warning.rb
+++ b/warning.rb
@@ -2,6 +2,7 @@
 # fronzen-string-literal: true
 
 module Kernel
+  module_function
 
   # call-seq:
   #    warn(*msgs, uplevel: nil)   -> nil