Why do "const inout" and "const inout shared" exist?

[Andrei Alexandrescu via Digitalmars-d]

On 07/02/2017 10:00 AM, Timon Gehr wrote:
> On 02.07.2017 15:33, Timon Gehr wrote:
>> On 02.07.2017 10:55, Walter Bright wrote:
>>> Neither I nor anyone here seems to understand its purpose.
>>
>> The opposite is true. I understand it, and you seem to understand it 
>> partially:
> 
> Also, there are actually at least two other people in this thread who 
> have demonstrated their understanding. So I count two confused people 
> and three people who are not confused. Still not a great ratio, but I'll 
> try to improve it with a blog post.

That's fantastic, Timon. Thanks in advance! -- Andrei