`in` no longer same as `const ref`

[Soulsbane via Digitalmars-d]

On Monday, 30 January 2017 at 00:26:27 UTC, Walter Bright wrote:
> On 1/29/2017 3:50 AM, Nordlöw wrote:
>> Why is `in` no longer the same as `const scope`?
>
> Because it was unchecked and largely unimplemented. I was 
> afraid that by checking it, too much code would break.

Unless I'm completely missing something the documentation still 
says:

http://dlang.org/spec/function.html#parameters
in	equivalent to const scope