https://git.ruby-lang.org/ruby.git/commit/?id=eb512c5a95

From eb512c5a9530322280991441954b0405cadeebf1 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 13 Dec 2019 21:38:50 +0900
Subject: warn should be a global function


diff --git a/lib/rubygems/core_ext/kernel_warn.rb b/lib/rubygems/core_ext/kernel_warn.rb
index 6ea72b1..dfc577d 100644
--- a/lib/rubygems/core_ext/kernel_warn.rb
+++ b/lib/rubygems/core_ext/kernel_warn.rb
@@ -16,7 +16,7 @@ if RUBY_VERSION >= "2.5" https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_warn.rb#L16
 
     end
 
-    define_method(:warn) do |*messages, **kw|
+    module_function define_method(:warn) {|*messages, **kw|
       unless uplevel = kw[:uplevel]
         if Gem.java_platform?
           return original_warn.call(*messages)
@@ -50,6 +50,6 @@ if RUBY_VERSION >= "2.5" https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_warn.rb#L50
 
       kw[:uplevel] = uplevel
       original_warn.call(*messages, **kw)
-    end
+    }
   end
 end
-- 
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