version(none)
void main() {
float[2] f1 = [0, 0]; float[2] f2 = [0, 0]; bool ok = f1 == f2;
import std.stdio; writeln(ok);
}

    import std.stdio;
    struct VertexB
    {
        float[2] pos;
    }
    struct Hold
    {
        VertexB v;
    }
    void main()
    {
        Hold[1] h_a; 
        Hold[1] h_b;

        assert(h_a[0].v.pos != h_b[0].v.pos);
        assert(h_a[0].v != h_b[0].v);
        assert(h_a[0] != h_b[0]);
        assert(h_a != h_b);

		h_a[0].v.pos = [0,0];
		h_b[0].v.pos = [0,0];

        assert(h_a[0].v.pos == h_b[0].v.pos);
        assert(h_a[0].v == h_b[0].v);
        assert(h_a[0] == h_b[0]);
        assert(h_a == h_b);

    }