},
			map[string]string{"a": "b"},
			map[string]string{"c": "d"},
			field.ErrorList{
				&field.Error{
					Type:  field.ErrorTypeInvalid,
					Field: field.NewPath("spec").Child("selector").String(),
					BadValue: &metav1.LabelSelector{
						MatchLabels:      map[string]string{"c": "d"},
						MatchExpressions: []metav1.LabelSelectorRequirement{},
					},
					Detail: "field is immutable",
				},
			},
		},
		{

			},
			map[string]string{"a": "b"},
			map[string]string{"c": "d"},
			field.ErrorList{
				&field.Error{
					Type:  field.ErrorTypeInvalid,
					Field: field.NewPath("spec").Child("selector").String(),
					BadValue: &metav1.LabelSelector{
						MatchLabels:      map[string]string{"c": "d"},
						MatchExpressions: []metav1.LabelSelectorRequirement{},
					},
					Detail: "field is immutable",
				},
			},
		},
		{

				errs = append(errs, field.Invalid(field.NewPath("spec").Child("selector"), newRc.Spec.Selector, "cannot update non-convertible selector"))
			}
		default:
			errs = append(errs, &field.Error{Type: field.ErrorTypeNotFound, BadValue: value, Field: brokenField, Detail: "unknown non-convertible field"})
		}
	}

	return errs
}

// WarningsOnUpdate returns warnings for the given update.