// appear later in the string.
type substitutions []AST

// add adds a new substitution candidate.
func (subs *substitutions) add(a AST) {
	*subs = append(*subs, a)
}

// subAST maps standard substitution codes to the corresponding AST.
var subAST = map[byte]AST{
	't': &Name{Name: "std"},
	'a': &Qualified{Scope: &Name{Name: "std"}, Name: &Name{Name: "allocator"}},

    assertEquals(ImmutableSortedSet.of(4, 6, 8, 10), Sets.subSet(set, Range.atLeast(4)));
    assertEquals(ImmutableSortedSet.of(8, 10), Sets.subSet(set, Range.atLeast(7)));
    assertEquals(empty, Sets.subSet(set, Range.atLeast(20)));

    assertEquals(set, Sets.subSet(set, Range.greaterThan(0)));
    assertEquals(ImmutableSortedSet.of(6, 8, 10), Sets.subSet(set, Range.greaterThan(4)));

		Port: &networking.PortSelector{
			Number: 80,
		},
		Subset: "v1",
	}
	dstV2 := &networking.Destination{
		Host: "productpage.org",
		Port: &networking.PortSelector{
			Number: 80,
		},
		Subset: "v2",
	}
	dstV3 := &networking.Destination{
		Host: "productpage.org",
		Port: &networking.PortSelector{
			Number: 80,
		},
		Subset: "v3",
	}
	dstMirrorV1 := dstV1.DeepCopy()

		if extendFQDN(fqdn) == svcHost {
			if dest.Destination.Subset != "" {
				if slices.Contains(nonmatchingSubsets, dest.Destination.Subset) {
					mismatchNotes = append(mismatchNotes, fmt.Sprintf("Route to non-matching subset %s for (%s)",
						dest.Destination.Subset,
						renderMatches(route.Match)))
					continue
				}
				if !slices.Contains(matchingSubsets, dest.Destination.Subset) {
					if dr == nil {

			}

			endpoints := &v1.Endpoints{Subsets: subsets}
			truncateEndpoints(endpoints)

			for i, subset := range endpoints.Subsets {
				if len(subset.Addresses) != tc.expectedReady[i] {
					t.Errorf("Unexpected number of actual ready Endpoints for subset %d: got %d endpoints, want %d endpoints", i, len(subset.Addresses), tc.expectedReady[i])
				}
				if len(subset.NotReadyAddresses) != tc.expectedNotReady[i] {

    }

    @Override
    public NavigableSet<E> subSet(
        @ParametricNullness E fromElement,
        boolean fromInclusive,
        @ParametricNullness E toElement,
        boolean toInclusive) {
      return forward.subSet(toElement, toInclusive, fromElement, fromInclusive).descendingSet();
    }

    @Override
    public SortedSet<E> subSet(@ParametricNullness E fromElement, @ParametricNullness E toElement) {

	Hosts:    []string{},
	Gateways: []string{"some-gateway"},
	Http: []*networking.HTTPRoute{
		{
			Route: []*networking.HTTPRouteDestination{
				{
					Destination: &networking.Destination{
						Subset: "some-subset",
						Host:   "*.example.org",
						Port: &networking.PortSelector{
							Number: 65000,
						},
					},
					Weight: 100,
				},
			},
		},
	},
}

    }

    @Override
    public NavigableSet<E> subSet(
        @ParametricNullness E fromElement,
        boolean fromInclusive,
        @ParametricNullness E toElement,
        boolean toInclusive) {
      return forward.subSet(toElement, toInclusive, fromElement, fromInclusive).descendingSet();
    }

    @Override
    public SortedSet<E> subSet(@ParametricNullness E fromElement, @ParametricNullness E toElement) {

		},
		{
			name: "back subset of cluster domain in address",
			service: &model.Service{
				Hostname:     "aaa.example.local",
				MeshExternal: true,
			},
			port: 7777,
			node: &model.Proxy{
				DNSDomain: "tests.svc.cluster.local",
			},
			want: []string{"aaa.example.local"},
		},
		{
			name: "front subset of cluster domain in address",
			service: &model.Service{

			Host: testhost,
			Subsets: []*networking.Subset{
				{
					Name: "subset1",
				},
				{
					Name: "subset2",
				},
			},
		},
	}
	destinationRuleNamespace2 := config.Config{
		Meta: config.Meta{
			Name:      "rule2",
			Namespace: "test",
		},
		Spec: &networking.DestinationRule{
			Host: testhost,
			Subsets: []*networking.Subset{
				{
					Name: "subset3",