1 files changed, 8 insertions, 0 deletions
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index c50cd38b7..59c965325 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -845,5 +845,13 @@ class TestModule < Test::Unit::TestCase
       end
     end
     assert_equal("", stderr, '[ruby-dev:39397]')
+
+    stderr = EnvUtil.verbose_warning do
+      Module.new do
+        def foo; end
+        undef foo
+      end
+    end
+    assert_equal("", stderr)
   end
 end