* compile.c (NODE_CLASS, NODE_MODULE), insns.def (defineclass): raise

an exception when "class Foo::Bar" is evaluated and Foo::Bar is
  private.  To implement this, define_type of "defineclass" is added
  so that the instruction can distinguish whether the class definition
  is scoped (class Foo::Bar) or not (class Bar).

* test/ruby/test_class.rb (test_redefine_private_class),
  test/ruby/test_module.rb
  (test_define_module_under_private_constant): add tests for above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30714 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_class.rb

@@ -240,4 +240,22 @@ class TestClass < Test::Unit::TestCase
   def test_nested_class_removal
     assert_normal_exit('File.__send__(:remove_const, :Stat); at_exit{File.stat(".")}; GC.start')
   end
+
+  class PrivateClass
+  end
+  private_constant :PrivateClass
+
+  def test_redefine_private_class
+    assert_raise(NameError) do
+      eval("class ::TestClass::PrivateClass; end")
+    end
+    eval <<-END
+      class ::TestClass
+        class PrivateClass
+          def foo; 42; end
+        end
+      end
+    END
+    assert_equal(42, PrivateClass.new.foo)
+  end
 end

test/ruby/test_module.rb

@@ -947,6 +947,24 @@ class TestModule < Test::Unit::TestCase
     c.private_constant(:FOO)
     assert_raise(NameError) { c::FOO }
     assert_equal("foo", c.class_eval("FOO"))
+    assert_equal("foo", c.const_get("FOO"))
+  end
+
+  class PrivateClass
+  end
+  private_constant :PrivateClass
+
+  def test_define_module_under_private_constant
+    assert_raise(NameError) do
+      eval %q{class TestModule::PrivateClass; end}
+    end
+    assert_raise(NameError) do
+      eval %q{module TestModule::PrivateClass::TestModule; end}
+    end
+    eval %q{class PrivateClass; end}
+    eval %q{module PrivateClass::TestModule; end}
+    assert_instance_of(Module, PrivateClass::TestModule)
+    PrivateClass.class_eval { remove_const(:TestModule) }
   end
 
   def test_public_constant