C1001 error when you compile source code that contains the ternary operator (?:) in Visual C++

When compiling source code containing the ternary operator (?:), if the compiler converts one of the operands from one class type to another, incorrect code may be generated or you might receive the following error message:

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:

#include <afx.h>
class F
{
	char m_str[50];
	CString cstr;
public:
	F(char *str)
	{
		strcpy(m_str, str);
		cstr = "CSTRING";
	}
	operator CString() 
	{
		cstr = m_str;
		return cstr;
	}
};

void H( const CString & state)
{
	F f("test");
	CString str;
	str = (state != "off") ? state : f;
}