https://git.ruby-lang.org/ruby.git/commit/?id=b222ae4101

From b222ae41015646e238e1d2f6710da02f38578388 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 23 Apr 2020 09:43:30 +0900
Subject: Test for [Bug #16669]


diff --git a/test/ruby/test_defined.rb b/test/ruby/test_defined.rb
index d254857..267744e 100644
--- a/test/ruby/test_defined.rb
+++ b/test/ruby/test_defined.rb
@@ -61,6 +61,14 @@ class TestDefined < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_defined.rb#L61
     f.attrasgn_test { |v| assert(v) }
   end
 
+  def test_defined_undef
+    x = Object.new
+    def x.foo; end
+    assert(defined?(x.foo))
+    x.instance_eval {undef :foo}
+    assert(!defined?(x.foo), "undefed method should not be defined?")
+  end
+
   def test_defined_yield
     assert(defined_test)		# not iterator
     assert(!defined_test{})	        # called as iterator
-- 
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