Deprecation process documented?

[FrankLike via Digitalmars-d-learn]

On Tuesday, 24 February 2015 at 07:49:55 UTC, Jacob Carlborg 
wrote:

Can you help me about 'Concurrency in D'? Thank you.

http://forum.dlang.org/thread/dugsyhsswoovgywplmbo@forum.dlang.org

Some people think rust is better ,but I think D is better.
But I don't know that how to use 'Concurrency in D',Can you help 
me ?
Thank you.