https://git.ruby-lang.org/ruby.git/commit/?id=69b6f8fd04

From 69b6f8fd047c5c9e0fa6f65656fda762f8ecfc5e Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Fri, 13 Dec 2019 00:04:01 +0900
Subject: Check wether TestReadline is defined


diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index 876d61e..e3c6727 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -434,7 +434,7 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L434
   def test_input_metachar
     skip "Skip Editline" if /EditLine/n.match(Readline::VERSION)
     skip("Won't pass on mingw w/readline 7.0.005 [ruby-core:45682]") if mingw?
-    skip 'Needs GNU Readline 6 or later' if windows? and kind_of?(TestReadline) and Readline::VERSION < '6.0'
+    skip 'Needs GNU Readline 6 or later' if windows? and defined?(TestReadline) and kind_of?(TestReadline) and Readline::VERSION < '6.0'
     bug6601 = '[ruby-core:45682]'
     Readline::HISTORY << "hello"
     wo = nil
@@ -683,7 +683,7 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L683
       # http://rubyci.s3.amazonaws.com/solaris11s-sunc/ruby-trunk/log/20181228T102505Z.fail.html.gz
       skip 'This test does not succeed on Oracle Developer Studio for now'
     end
-    skip 'Needs GNU Readline 6 or later' if windows? and kind_of?(TestReadline) and Readline::VERSION < '6.0'
+    skip 'Needs GNU Readline 6 or later' if windows? and defined?(TestReadline) and kind_of?(TestReadline) and Readline::VERSION < '6.0'
 
     Readline.completion_proc = -> (_) { [] }
     Readline.completer_quote_characters = "'\""
-- 
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