https://git.ruby-lang.org/ruby.git/commit/?id=a2e8712349

From a2e87123499f6eef9c03089f61f174dd4b3cc673 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 13 Dec 2019 20:51:58 +0900
Subject: Fix visibility as module_function


diff --git a/warning.rb b/warning.rb
index 8361176..224650d 100644
--- a/warning.rb
+++ b/warning.rb
@@ -2,6 +2,7 @@ https://github.com/ruby/ruby/blob/trunk/warning.rb#L2
 # fronzen-string-literal: true
 
 module Kernel
+  module_function
 
   # call-seq:
   #    warn(*msgs, uplevel: nil)   -> nil
-- 
cgit v0.10.2


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