vm_method.c: check if frozen [Fix GH-1096]

* vm_method.c (set_method_visibility): should fail if the receiver
  is frozen.  [ruby-core:71489] [Bug #11687]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52579 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 1 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 19cf418cf1..dbbeca850d 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -624,13 +624,22 @@ class TestModule < Test::Unit::TestCase
   end
 
   def test_freeze
-    m = Module.new
+    m = Module.new do
+      def self.baz; end
+      def bar; end
+    end
     m.freeze
     assert_raise(RuntimeError) do
       m.module_eval do
         def foo; end
       end
     end
+    assert_raise(RuntimeError) do
+      m.__send__ :private, :bar
+    end
+    assert_raise(RuntimeError) do
+      m.private_class_method :baz
+    end
   end
 
   def test_attr_obsoleted_flag