I don't understand what you mean here.  I cannot find the "::Rename1" in the test suite that is supposed to be being updated.  I have checked the link, and it says the project has not been updated since 2010, so I should have the correct version.
Trying to guess what you are describing, I have tested with the following code in a .cpp file:
class testClassDuplicateName
{
public:
	static void useGlobalClass()	{ }
};
namespace testSpaceHoldingDuplicate
{
	class testClassDuplicateName
	{
		void useSpaceClass()	{ }
	};
	void testCallingGlobalClass()
	{
		::testClassDuplicateName::useGlobalClass();
	}
}
and so far I am not seeing any obvious problems.  This code compiles quite happily, and has more distinct names to avoid any accidental problems with duplicate names.