object.c: undef Module#prepend_features on Class

* object.c (Init_Object): undef Module#prepend_features on Class, as
  well as Module#append_features.  [Fixes GH-376]
* test_class.rb: Added test for above. And ensure type checking
  on similar methods as module_function.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42541 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Tue Aug 13 21:52:15 2013  Kenichi Kamiya  <kachick1@gmail.com>
+
+	* object.c (Init_Object): undef Module#prepend_features on Class, as
+	  well as Module#append_features.  [Fixes GH-376]
+
+	* test_class.rb: Added test for above. And ensure type checking
+	  on similar methods as module_function.
+
 Tue Aug 13 08:52:18 2013  Zachary Scott  <e@zzak.io>
 
 	* doc/syntax/literals.rdoc: [DOC] String literal concat by @cknadler

object.c

@@ -3242,6 +3242,7 @@ Init_Object(void)
     rb_define_alloc_func(rb_cClass, rb_class_s_alloc);
     rb_undef_method(rb_cClass, "extend_object");
     rb_undef_method(rb_cClass, "append_features");
+    rb_undef_method(rb_cClass, "prepend_features");
 
     /*
      * Document-class: Data

test/ruby/test_class.rb

@@ -105,6 +105,32 @@ class TestClass < Test::Unit::TestCase
     end
   end
 
+  def test_extend_object
+    c = Class.new
+    assert_raise(TypeError) do
+      Module.instance_method(:extend_object).bind(c).call(Object.new)
+    end
+  end
+
+  def test_append_features
+    c = Class.new
+    assert_raise(TypeError) do
+      Module.instance_method(:append_features).bind(c).call(Module.new)
+    end
+  end
+
+  def test_prepend_features
+    c = Class.new
+    assert_raise(TypeError) do
+      Module.instance_method(:prepend_features).bind(c).call(Module.new)
+    end
+  end
+
+  def test_module_specific_methods
+    assert_empty(Class.private_instance_methods(true) &
+      [:module_function, :extend_object, :append_features, :prepend_features])
+  end
+
   def test_method_redefinition
     feature2155 = '[ruby-dev:39400]'