structs inheriting from and implementing interfaces

[Mike Franklin via Digitalmars-d-learn]

In C#, structs can inherit from and implement interfaces.
----
using System;

interface IPrint
{
    void Print();
}

struct MyStruct : IPrint
{
    public void Print()
    {
        Console.WriteLine(ToString());
    }
}

public class Program
{
    public static void Main()
    {
        MyStruct s = new MyStruct();
        s.Print();
    }
}
----
https://dotnetfiddle.net/lpXR1O

But in D it doesn't appear possible.
----
import std.stdio;

interface IPrint
{
    void print();
}

// Error: base classes are not allowed for struct, did you mean ;?
struct MyStruct : IPrint   // Error: base classes are not allowed 
for struct, did you mean ;?
{
    void print()
    {
        writeln("MyStruct");
    }
}

void main()
{
        MyStruct s;
    s.Print();
}
----
https://run.dlang.io/is/j4xwla

Is that simply because it hasn't been implemented or suggested 
yet for D, or was there a deliberate design decision?

Thanks for your insight,

Mike