I've downloaded Qt 5.4 for Windows, running it in Windows 8.1 Pro. It comes with MingW and Qt Creator 3.3.
I've been using Qt for few years. Still a very necessary component seems missing in the Qt Creator IDE. Suppose a class
string getSymbol() const;
^----------------- Note this dot
This has been a long standing issue discussed asked and asked over again on forums and mailing lists. As thuga correctly showed in the comment, this is the corresponding bugreport to monitor:
Note that QtCreator was primarily meant for working with Qt code and so you would use
QVector in such projects which is working. I am not saying that it is not worth fixing, but that is at least the history.
This may be getting closer and closer with using clang inside QtCreator, but I guess you will need to wait.