[Bug c++/13383] New: scope for top-level using statements is wrong

["tromey at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13383

             Bug #: 13383
           Summary: scope for top-level using statements is wrong
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: tromey@redhat.com
    Classification: Unclassified


Consider this:

namespace A {
  namespace B {
    namespace C {
      int x = 5;

      int nsfunc () {
    return x;
      }
    }
  }
}

namespace Q = A::B;

int xfun() {
  return Q::C::x;        // Breakpoint xfun
}

using namespace Q::C;

int yfun() {
  return x;            // Breakpoint yfun
}

int main(){
  return xfun() + yfun();
}


If you stop in xfun, then "print x" should fail.
Currently it prints A::B::C::x.

The bug here is that "using" statements aren't properly scoped.
Implementing this would probably require something like the macro
code's scope stuff to be available for using / blocks as well.

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