struct A

{

    int[] data;

​

    this(ref return scope           A rhs)            { /* body */ }

    this(ref return scope const     A rhs) const      { /* body */ }

    this(ref return scope immutable A rhs) immutable  { /* body */ }

}

​

struct B

{

    A a;

​

    // default generated copy constructor, by section 14.15.6.2

    this(ref return scope inout(B) src) inout

    {

        foreach (i, ref inout field; src.tupleof)

            this.tupleof[i] = field;

    }

}