[Bug #19841] Refine error on marshaling recursive USERDEF

1 files changed, 9 insertions, 0 deletions

diff --git a/test/ruby/test_marshal.rb b/test/ruby/test_marshal.rb
index bcd8892f23..404a954c4b 100644
--- a/test/ruby/test_marshal.rb
+++ b/test/ruby/test_marshal.rb
@@ -676,6 +676,15 @@ class TestMarshal < Test::Unit::TestCase
     end
   end
 
+  def test_recursive_userdef
+    t = Time.utc(0)
+    str = "b".b
+    t.instance_eval {@v = t}
+    assert_raise_with_message(RuntimeError, /recursive\b.*\b_dump/) do
+      Marshal.dump(t)
+    end
+  end
+
   def test_unloadable_usrmarshal
     c = eval("class UsrMarshal\u{23F0 23F3}<Time;self;end")
     c.class_eval {