1 files changed, 9 insertions, 0 deletions
diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index e8ab6135c4..596bddf1e5 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -298,6 +298,15 @@ class TestObject < Test::Unit::TestCase
       $VERBOSE = false
       def (Object.new).__send__; end
     INPUT
+
+    bug10421 = '[ruby-dev:48691] [Bug #10421]'
+    assert_in_out_err([], <<-INPUT, ["1"], [], bug10421)
+      $VERBOSE = false
+      class C < BasicObject
+        def object_id; 1; end
+      end
+      puts C.new.object_id
+    INPUT
   end
 
   def test_remove_method