[PATCH] PR c++/53609 - Wrong argument deduction for pack expansion in argument pack

[Jason Merrill]

On 12/11/2012 10:55 AM, Dodji Seketeli wrote:
> Oops, it seems I was too hasty in trying to do away with the
> instantiation_yields_no_list_p parameter to
> gen_elem_of_pack_expansion_instantiation.

I still think that the elem function should just deal with the single 
element case; the cases where we can't do a piecewise substitution 
should be handled outside the elem function.

>> I suppose we should keep this for has_empty_arg, but I'd like to do
>> away with special handling of the arg_from_parm_pack case if possible,
>> as it's a lot of extra complexity.
>
> OK, done.

Looks like you only removed the check from that one if; I'd like to do 
away with the arg_from_parm_pack function entirely if we can.

Jason