https://git.ruby-lang.org/ruby.git/commit/?id=f36a53d038

From f36a53d03821624d30b3e91a7a75307b06e3a03c Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Tue, 12 Nov 2019 15:44:19 +0900
Subject: Only enabled mon_owned condition with Ruby 2.5+


diff --git a/lib/rubygems/core_ext/kernel_require.rb b/lib/rubygems/core_ext/kernel_require.rb
index d2bcc50..76165a6 100644
--- a/lib/rubygems/core_ext/kernel_require.rb
+++ b/lib/rubygems/core_ext/kernel_require.rb
@@ -32,7 +32,9 @@ module Kernel https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_require.rb#L32
   # that file has already been loaded is preserved.
 
   def require(path)
-    monitor_owned = RUBYGEMS_ACTIVATION_MONITOR.mon_owned?
+    if RUBYGEMS_ACTIVATION_MONITOR.respond_to?(:mon_owned?)
+      monitor_owned = RUBYGEMS_ACTIVATION_MONITOR.mon_owned?
+    end
     RUBYGEMS_ACTIVATION_MONITOR.enter
 
     path = path.to_path if path.respond_to? :to_path
@@ -167,9 +169,11 @@ module Kernel https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_require.rb#L169
 
     raise load_error
   ensure
-    if monitor_owned != (ow = RUBYGEMS_ACTIVATION_MONITOR.mon_owned?)
-      STDERR.puts [$$, Thread.current, $!, $!.backtrace].inspect if $!
-      raise "CRITICAL: RUBYGEMS_ACTIVATION_MONITOR.owned?: before #{monitor_owned} -> after #{ow}"
+    if RUBYGEMS_ACTIVATION_MONITOR.respond_to?(:mon_owned?)
+      if monitor_owned != (ow = RUBYGEMS_ACTIVATION_MONITOR.mon_owned?)
+        STDERR.puts [$$, Thread.current, $!, $!.backtrace].inspect if $!
+        raise "CRITICAL: RUBYGEMS_ACTIVATION_MONITOR.owned?: before #{monitor_owned} -> after #{ow}"
+      end
     end
   end
 
-- 
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