`in` no longer same as `const ref`

[Walter Bright via Digitalmars-d]

On 1/30/2017 12:42 AM, Radu wrote:
> Can it be enabled for -dip1000 flag?
> Doc was pretty clear on what it was suppose to do and people kinda knew that
> scope was not finished.
>
> Having it turned on for dip flag will allow some testing of the existing code. I
> would like to have in's intended semantic finally implemented.

I'd rather do one thing at a time.