t.Errorf("multiWriter did not flatten chained multiWriters: expected writeDepth %d, got %d",
			4*(myDepth+2), writeDepth)
	}
}

func TestMultiWriterError(t *testing.T) {
	f1 := writerFunc(func(p []byte) (int, error) {
		return len(p) / 2, ErrShortWrite
	})
	f2 := writerFunc(func(p []byte) (int, error) {
		t.Errorf("MultiWriter called f2.Write")