Steps:
- Create C++ project with such code
--------------------------------------------

namespace AA {
    int f() {
        return 0;
    }
}

namespace BB {
    int f() {
        return 0;
    }
    
    inf f2() {
        return 1;
    }
}

int main(void) {
    
    return 0;
}

--------------------------------------------
- Push "Navigate|C/C++ Go To Declaration..." menu item
- Type "A" in "Go To Declaration" window
==> "AA" appears in table, but I cann't jump to source code