1 files changed, 11 insertions, 0 deletions
diff --git a/test/ruby/test_marshal.rb b/test/ruby/test_marshal.rb
index 1b74b47dd1..3548850a42 100644
--- a/test/ruby/test_marshal.rb
+++ b/test/ruby/test_marshal.rb
@@ -684,4 +684,15 @@ class TestMarshal < Test::Unit::TestCase
       Marshal.load(d)
     }
   end
+
+  def test_unloadable_usrmarshal
+    c = eval("class UsrMarshal\u{23F0 23F3}<Time;self;end")
+    c.class_eval {
+      alias marshal_dump _dump
+    }
+    d = Marshal.dump(c.new)
+    assert_raise_with_message(TypeError, /UsrMarshal\u{23F0 23F3}/) {
+      Marshal.load(d)
+    }
+  end
 end