Patch for constexpr variable templates

[Braden Obrzut]

Ed, I looked into partial specializations and it looks like, while not 
trivial, it would be easy enough for me to do them.  However, it is not 
required for concepts (which can not be specialized), so should I fix 
them for this patch or as a separate patch later?

On 07/25/2014 05:24 PM, Jason Merrill wrote:
>
> Fair enough, but in that case let's use 'sorry' rather then 'error' to 
> be clear that it's a missing feature.
>
Tests like g++.dg/cpp1y/pr59638.C produce extra failures if this is 
changed.  Is there something I'm supposed to do to account for that?

- Braden Obrzut