r2a := r1a.Link(&r1b)
	verify(t, r2a, 2, 1)
	if r2a != r1a {
		t.Errorf("a) 2-element link failed")
	}

	r2b := r2a.Link(r2a.Next())
	verify(t, r2b, 2, 1)
	if r2b != r2a.Next() {
		t.Errorf("b) 2-element link failed")
	}

	r1c := r2b.Link(r2b)
	verify(t, r1c, 1, 1)
	verify(t, r2b, 1, 0)
}

func TestLink2(t *testing.T) {
	var r0 *Ring
	r1a := &Ring{Value: 42}
	r1b := &Ring{Value: 77}

	stashBuffer   []byte
}

// newParallelReader returns parallelReader.
func newParallelReader(readers []io.ReaderAt, e Erasure, offset, totalLength int64) *parallelReader {
	r2b := make([]int, len(readers))
	for i := range r2b {
		r2b[i] = i
	}
	bufs := make([][]byte, len(readers))
	// Fill buffers
	b := globalBytePoolCap.Load().Get()
	shardSize := int(e.ShardSize())
	if cap(b) < len(readers)*shardSize {