n int
}

func (r *emptyThenNonEmptyReader) Read(p []byte) (int, error) {
	if r.n <= 0 {
		return r.r.Read(p)
	}
	r.n--
	return 0, nil
}

// Test for golang.org/issue/7611
func TestWriterReadFromUntilEOF(t *testing.T) {
	buf := new(bytes.Buffer)
	w := NewWriterSize(buf, 5)

	// Partially fill buffer
	n, err := w.Write([]byte("0123"))
	if n != 4 || err != nil {