[Bug c++/51148] New: [C++0x] Unexpanded template param packs wrongly accepted in friend class declarations

[ai.azuma at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51148

             Bug #: 51148
           Summary: [C++0x] Unexpanded template param packs wrongly
                    accepted in friend class declarations
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ai.azuma@gmail.com


Created attachment 25831
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25831
Outputs by -v option and preprocessed source.

GCC 4.7-20111112 with -std=c++11 wrongly accepts the following ill-formed code.

===========================
template<typename... Types>
struct S
{};

template<typename... Types>
struct T
{
  friend class S<Types>;
};

int main()
{}
===========================