patch: check constructor initializer list packs

[Richard Smith]

Looks great, thanks!

On Wed, Jun 12, 2013 at 5:23 PM, Nick Lewycky <nlewycky at google.com> wrote:
> On 12 June 2013 16:35, Richard Smith <richard at metafoo.co.uk> wrote:
>>
>> Is there a reason not to just build a single vector of unexpanded
>> packs, and check it once?
>
>
> Nope! Updated patch attached.
>
> Nick
>
>>
>> On Wed, Jun 12, 2013 at 4:20 PM, Nick Lewycky <nlewycky at google.com> wrote:
>> > This patch fixes a slight oversight with a pack expansion of constructor
>> > initialization lists of the form "S() : T<Pack1>(Pack2)... {}" not
>> > checking
>> > the arity of the unexpanded packs in the initializer expression.
>> >
>> > Fixes PR16303. Please review!
>> >
>> > Nick
>> >
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>
>