structs inheriting from and implementing interfaces

[thedeemon]

On Friday, 29 December 2017 at 12:03:59 UTC, Mike Franklin wrote:
> Is that simply because it hasn't been implemented or suggested 
> yet for D, or was there a deliberate design decision?

It's a design decision.
Look carefully at structs vs. classes here:
https://dlang.org/spec/struct.html

There is no virtual methods table (VMT) for structs, no 
inheritance. Structs have value semantics. A variable with a type 
of some interface implies it's a pointer, with reference 
semantics and a VMT.