[Bug c++/53873] New: [C++11] strange error message for template overloading

[frankhb1989 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53873

             Bug #: 53873
           Summary: [C++11] strange error message for template overloading
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: frankhb1989@gmail.com


Sometimes g++ complains:
sorry, unimplemented: use of 'type_pack_expansion' in template
But there seems to be no apparent reason for this error.
Please see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53872 for details (an
example including code and full diagnostic messages).