1 files changed, 4 insertions, 0 deletions
diff --git a/test/ruby/test_fixnum.rb b/test/ruby/test_fixnum.rb
index 95a273bb94..a031923b02 100644
--- a/test/ruby/test_fixnum.rb
+++ b/test/ruby/test_fixnum.rb
@@ -271,4 +271,8 @@ class TestFixnum < Test::Unit::TestCase
   def test_xor_with_nonintegral_numeric
     assert_raise(TypeError, "#1792") { 1 ^ DummyNumeric.new }
   end
+
+  def test_singleton_method
+    assert_raise(TypeError) { a = 1; def a.foo; end }
+  end
 end