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

[Timon Gehr via Digitalmars-d]

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.