import std.stdio, std.typecons;

struct Vector3f {

    float x, y, z;

    @disable this(this);

}

struct Ray {

    RefCounted!Vector3f origin;

    RefCounted!Vector3f dir;

    this(RefCounted!Vector3f origin, RefCounted!Vector3f dir) @nogc {

        this.origin = origin;

        this.dir = dir;

    }

}

​

void main(string[] args) @nogc

{

    auto v1 = RefCounted!Vector3f(Vector3f(0, 0, 0));

    auto v2 = RefCounted!Vector3f(Vector3f(0, 0, 0));

    Ray(v1, v2);

}