Copy Constructor DIP and implementation

[Gary Willoughby]

On Tuesday, 11 September 2018 at 15:08:33 UTC, RazvanN wrote:
> Hello everyone,
>
> I have finished writing the last details of the copy 
> constructor DIP[1] and also I have published the first 
> implementation [2]. As I wrongfully made a PR for the DIP queue 
> in the early stages of the development of the DIP, I want to 
> announce this way that the DIP is ready for the draft review 
> now. Those who are familiar with the compiler, please take a 
> look at the implementation and help me improve it!
>
> Thanks,
> RazvanN
>
> [1] https://github.com/dlang/DIPs/pull/129
> [2] https://github.com/dlang/dmd/pull/8688

I'm not sure about the naming of `@implicit` attribute. It seems 
confusing when used. `@copy` feels more natural or do we even 
need a new attribute at all?