It's not always possible for error messages to know what you were really trying to achieve. It can't know that you've forgotten a header when there are millions to choose from, or in this case, that you've forgotten something's in the std:: namespace when you might actually have wanted something in the global namespace and just forgotten a header!

I guess you're right, but like I said before, it can be very confusing if you don't know what your looking for (to fix).