[Bug c++/48424] C++0x parameter packs expansion problem

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48424

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-18 
21:23:46 UTC ---
Jason, when this bug is fixed will this be allowed too?

template<typename... Args1>
struct S
{
  template<typename... Args2>
    void f(Args1... args1, Args2&&... args2)
    {
    }
};

S<int, int> s;

Currently this gives:

var.cc:5:47: error: parameter packs must be at the end of the parameter list

But it seems like it should be ok since sizeof...(Args1) is fixed when calling
S::f and so shouldn't interfere with deducing Args2

(I wanted to do something of this form to make std::mem_fn support varargs
member functions such as R (T::*)(int, ...) where Args1 would be [int] and
Args2 would be the additional arguments passed to _Mem_fn::operator())