[Bug c++/54191] New: [C++11] SFINAE does not handle conversion to inaccessible base

[ai.azuma at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54191

             Bug #: 54191
           Summary: [C++11] SFINAE does not handle conversion to
                    inaccessible base
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: ai.az...@gmail.com


The attached code includes some test cases for SFINAE on expressions
necessitating conversion from (a pointer to) an object of a derived class to (a
pointer to) an object of an inaccessible base class, or inverse of such
conversion. All the static_asserts in the attached code should be well-formed
according to the specification, but fail with GCC 4.8.0 20120805.

I think this PR is closely related to PR51213.