http://wiki.dlang.org/DIP25 has been preliminarily approved for 2.067

[Walter Bright via Digitalmars-d]

On 1/17/2015 7:38 PM, Jonathan M Davis via Digitalmars-d wrote:
> I am a bit surprised though that you agreed to it
> given that in previous discussions you seemed opposed to adding any more
> attributes for parameters. It does make for a fairly straightforward
> solution though.

Your last sentence explains it.

The 'return ref' with deduction also appears to cause the fewest changes to 
existing code.