func (agg aggregate) Errors() []error {
	return []error(agg)
}

// Matcher is used to match errors.  Returns true if the error matches.
type Matcher func(error) bool

// FilterOut removes all errors that match any of the matchers from the input
// error.  If the input is a singular error, only that error is tested.  If the
// input implements the Aggregate interface, the list of errors will be

				s.Type = ""

				changed = true
			}

			for f, fs := range s.Properties {
				if fs.Nullable {
					s.ValueValidation.Required, changed = filterOut(s.ValueValidation.Required, f)
				}
			}
			if s.AdditionalProperties != nil && s.AdditionalProperties.Structural != nil && s.AdditionalProperties.Structural.Nullable {
				s.ValueValidation.Required, changed = nil, true

// multiple times, use the Infos() method.
func (r *Result) Visit(fn VisitorFunc) error {
	if r.err != nil {
		return r.err
	}
	err := r.visitor.Visit(fn)
	return utilerrors.FilterOut(err, r.ignoreErrors...)
}

// IntoSingleItemImplied sets the provided boolean pointer to true if the Builder input
// implies a single item, or multiple.
func (r *Result) IntoSingleItemImplied(b *bool) *Result {

}

// Filter removes items from the ErrorList that match the provided fns.
func (list ErrorList) Filter(fns ...utilerrors.Matcher) ErrorList {
	err := utilerrors.FilterOut(list.ToAggregate(), fns...)
	if err == nil {
		return nil
	}
	// FilterOut takes an Aggregate and returns an Aggregate
	return fromAggregate(err.(utilerrors.Aggregate))

			[]Matcher{func(err error) bool { return err.Error() == "def" }},
			aggregate{aggregate{fmt.Errorf("abc")}},
		},
	}
	for i, testCase := range testCases {
		err := FilterOut(testCase.err, testCase.filter...)
		if !reflect.DeepEqual(testCase.expected, err) {
			t.Errorf("%d: expected %v, got %v", i, testCase.expected, err)
		}
	}
}

func TestFlatten(t *testing.T) {

		{"abc", []string{"a", "b", "c"}, "c", []string{"a", "b"}, true},
		{"abbbcc", []string{"a", "b", "b", "b", "c", "c"}, "b", []string{"a", "c", "c"}, true},
	} {
		t.Run(tt.name, func(t *testing.T) {
			got, gotChanged := filterOut(tt.input, tt.x)
			if !reflect.DeepEqual(tt.expected, got) {
				t.Errorf("expected slice %v, got %v", tt.expected, got)
			}
			if tt.expectedChanged != gotChanged {