[Bug c++/57384] New: can't expand a parameter pack into a list of function types or function pointer types

["eric.niebler at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57384

            Bug ID: 57384
           Summary: can't expand a parameter pack into a list of function
                    types or function pointer types
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eric.niebler at gmail dot com

I believe all of the following 4 test cases should pass:

  template<typename ...Ts>
  struct list
  {};

  template<typename ...Ts>
  struct S
  {
      using type1 = void(int...(Ts));    // fails
      using type2 = list<int...(Ts)>;    // fails
      using type3 = void(int(*...)(Ts)); // fails
      using type4 = list<int(*...)(Ts)>; // works with 4.7, fails with 4.8
  };

Currently (i.e. with gcc-4.8), 1-4 all fail. With gcc-4.7, (4) worked. I'm
compiling with -std=gnu++11