https://git.ruby-lang.org/ruby.git/commit/?id=ac0658e720

From ac0658e72095a2e70f70635a0e2d8c908e54c41e Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sun, 9 Feb 2020 16:41:07 +0900
Subject: [ruby/readline-ext] Check TestRelineAsReadline existance

https://github.com/ruby/readline-ext/commit/c0a6303168

diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index 0c65d52..93cadbb 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -45,7 +45,7 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L45
       # Work around lack of SecurityError in Reline
       # test mode with tainted prompt.
       # Also skip test on Ruby 2.7+, where $SAFE/taint is deprecated.
-      if RUBY_VERSION < '2.7' && !kind_of?(TestRelineAsReadline)
+      if RUBY_VERSION < '2.7' && defined?(TestRelineAsReadline) && !kind_of?(TestRelineAsReadline)
         begin
           Thread.start {
             $SAFE = 1
-- 
cgit v0.10.2


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