[Bug c++/51641] New: Lookup finds enclosing class member instead of template parameter

["jason at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51641

             Bug #: 51641
           Summary: Lookup finds enclosing class member instead of
                    template parameter
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jason@gcc.gnu.org
                CC: dodji@gcc.gnu.org
        Depends on: 36019, 45625


Another case of the lookup problem you fixed previously has come up on the core
mailing list:

struct A {
    struct B { typedef int X; };
};

template<class B> struct C : A {
    B::X q; // Ok: A::B.                                                        
    struct U { typedef int X; };
    template<class U>
        struct D;
};

template<class B>
template<class U>
struct C<B>::D {
    typename U::X r; // { dg-error "" }

C<int>::D<double> y;

The use of U in D should find the template parameter, leading to an error on
instantiation.