The following (IMHO invalid) code snippet is accepted since 2.95.x:

==========================
struct A;

struct B
{
    struct ::A;
};
==========================

-- 
           Summary: invalid declaration in struct not rejected
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18101

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