Add spec for #define_method on BasicObject with an UnboundMethod retrieved from Object

Author: eregon

spec/ruby/core/module/define_method_spec.rb

@@ -396,6 +396,14 @@ class DefineMethodSpecClass
     klass.new.should respond_to(:bar)
   end
 
+
+  it "allows an UnboundMethod of a Kernel method retrieved from Object to defined on a BasicObject subclass" do
+    klass = Class.new(BasicObject) do
+      define_method :instance_of?, ::Object.instance_method(:instance_of?)
+    end
+    klass.new.instance_of?(klass).should == true
+  end
+
   it "raises a TypeError when an UnboundMethod from a child class is defined on a parent class" do
     lambda {
       ParentClass = Class.new { define_method(:foo) { :bar } }