}
	}
}

type unexported struct {
	X int
	y int
}

type exported struct {
	X int
	Y int
}

func TestUnexportedStructField(t *testing.T) {
	want := StructuralError{"struct contains unexported fields"}

	_, err := Marshal(unexported{X: 5, y: 1})
	if err != want {
		t.Errorf("got %v, want %v", err, want)
	}