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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/56429] New: [C++11] Explicitly defaulted private constructor is not private
Date: Fri, 22 Feb 2013 21:51:00 -0000
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X-Bugzilla-Keywords: accepts-invalid
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56429

             Bug #: 56429
           Summary: [C++11] Explicitly defaulted private constructor is
                    not private
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: redi@gcc.gnu.org


class A
{
    A() = default;
};
struct B : A { };

B b;

This should be rejected, but 4.6, 4.7 and 4.8 accept it.

(4.4 also accepts it, while 4.5 rejects it for a different reason.)