[Bug c++/62143] New: unlimited number of class name qualifiers allowed

["haynberg at sig dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62143

            Bug ID: 62143
           Summary: unlimited number of class name qualifiers allowed
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haynberg at sig dot com

I'm not sure if this is a bug or allowed by the standard.  Either way, it's
strange this is allowed.

$ cat t.cpp
#include <iostream>
using namespace std;

struct X {
   void foo();
};

// an unlimited number of "X::"s are allowed !!
void X::X::X::X::X::foo()
{
   cout << "ctor" << endl;
}

// if you uncomment this, you'll get a redefinition error
// void X::foo()
// {
//    cout << "ctor" << endl;
// }

int main()
{
   X x;
   x.foo();
}

$ g++ t.cpp 
$ a.out
ctor
$ g++ -v 
...
gcc version 4.8.2 (GCC)
...
$ uname -isr
Linux 3.0.38-0.5-default x86_64