lupdate breaks class resolution when any #include directive is not followed by space

When an #include directive is found in a .cpp file which is not immediately followed by space, it looks that the namespace/class resolution is broken.

class C : public QObject
{
    Q_OBJECT
};

Notice the missing space in the fist include below:

#include<sstream>
#include "C.h"

bool C::aaa()
{
    // works OK
    ::C::tr("..");
    // does not work
    tr("..");
}

$ lupdate -silent C.cpp -ts foo.ts
[...]C.cpp:9: Qualifying with unknown namespace/class ::C

Please note that the actual header file which defines the C class does not contain the "missing space error". Also note that neither gcc 4.6 nor clang 3.3 complains about the missing space.