'partial' keyword in C# is very good for project , what's the same thing in D?

[Gary Willoughby via Digitalmars-d]

On Wednesday, 29 October 2014 at 12:55:01 UTC, FrankLike wrote:
> The same thing in D should be done,now.Otherwise，no big 
> projects can be done like C#. Add another keyword,and update 
> the compiler.

Large projects are already being developed using D so your 
argument is wrong. Also no new keywords are being added to the 
language because D is trying to achieve stability right now.

You can achieve what you desire using mixins.