1 files changed, 7 insertions, 0 deletions
diff --git a/test/ruby/test_float.rb b/test/ruby/test_float.rb
index a63c18f8bc..2ac394465f 100644
--- a/test/ruby/test_float.rb
+++ b/test/ruby/test_float.rb
@@ -600,4 +600,11 @@ class TestFloat < Test::Unit::TestCase
       assert_operator(n, :<=, e)
     end
   end
+
+  def test_singleton_method
+    # flonum on 64bit platform
+    assert_raise(TypeError) { a = 1.0; def a.foo; end }
+    # always not flonum
+    assert_raise(TypeError) { a = Float::INFINITY; def a.foo; end }
+  end
 end