assertAssignable(
        TypeToken.of(new TypeCapture<L>() {}.capture()),
        TypeToken.of(new TypeCapture<L>() {}.capture()));
    assertNotAssignable(
        TypeToken.of(new TypeCapture<R>() {}.capture()),
        TypeToken.of(new TypeCapture<L>() {}.capture()));
    assertAssignable(TypeToken.of(new TypeCapture<L>() {}.capture()), new TypeToken<List<R>>() {});
  }

  public void testisSupertypeOf_resolved() {

            .where(
                new TypeCapture<Iterable<Map<?, V>>>() {}.capture(),
                new TypeCapture<Iterable<Map<String, Integer>>>() {}.capture());
    assertEquals(
        new TypeCapture<K>() {}.capture(), resolver.resolveType(new TypeCapture<K>() {}.capture()));
    assertEquals(Integer.class, resolver.resolveType(new TypeCapture<V>() {}.capture()));
  }

  public <T> void testWhere_mapFromWildcard() {

            .where(
                new TypeCapture<Iterable<Map<?, V>>>() {}.capture(),
                new TypeCapture<Iterable<Map<String, Integer>>>() {}.capture());
    assertEquals(
        new TypeCapture<K>() {}.capture(), resolver.resolveType(new TypeCapture<K>() {}.capture()));
    assertEquals(Integer.class, resolver.resolveType(new TypeCapture<V>() {}.capture()));
  }

  public <T> void testWhere_mapFromWildcard() {

    assertAssignable(
        TypeToken.of(new TypeCapture<L>() {}.capture()),
        TypeToken.of(new TypeCapture<L>() {}.capture()));
    assertNotAssignable(
        TypeToken.of(new TypeCapture<R>() {}.capture()),
        TypeToken.of(new TypeCapture<L>() {}.capture()));
    assertAssignable(TypeToken.of(new TypeCapture<L>() {}.capture()), new TypeToken<List<R>>() {});
  }

  public void testisSupertypeOf_resolved() {

    ParameterizedType ourType =
        Types.newParameterizedTypeWithOwner(Map.class, Entry.class, String.class, int[][].class);

    new EqualsTester()
        .addEqualityGroup(jvmType, ourType)
        .addEqualityGroup(new TypeCapture<Entry<String, String>>() {}.capture())
        .addEqualityGroup(new TypeCapture<Map<String, Integer>>() {}.capture())
        .testEquals();

    ParameterizedType ourType =
        Types.newParameterizedTypeWithOwner(Map.class, Entry.class, String.class, int[][].class);

    new EqualsTester()
        .addEqualityGroup(jvmType, ourType)
        .addEqualityGroup(new TypeCapture<Entry<String, String>>() {}.capture())
        .addEqualityGroup(new TypeCapture<Map<String, Integer>>() {}.capture())
        .testEquals();

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * Captures the actual type of {@code T}.
 *
 * @author Ben Yu
 */
@ElementTypesAreNonnullByDefault
abstract class TypeCapture<T> {

  /** Returns the captured type. */
  final Type capture() {
    Type superclass = getClass().getGenericSuperclass();

  public <T> void testVisitGenericArrayType() {
    Type type = new TypeCapture<T[]>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override
      void visitGenericArrayType(GenericArrayType t) {}
    }.visit(type);
  }

  public <T> void testVisitParameterizedType() {
    Type type = new TypeCapture<Iterable<T>>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override

  public <T> void testVisitGenericArrayType() {
    Type type = new TypeCapture<T[]>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override
      void visitGenericArrayType(GenericArrayType t) {}
    }.visit(type);
  }

  public <T> void testVisitParameterizedType() {
    Type type = new TypeCapture<Iterable<T>>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override

   * {@code ArrayList<?>::set}.
   *
   * <p>Instead, {@code <?>} will be resolved to a capture in the form of a type variable {@code
   * <capture-of-? extends Object>}, effectively preventing {@code set} from accepting any type.
   */
  static TypeResolver invariantly(Type contextType) {
    Type invariantContext = WildcardCapturer.INSTANCE.capture(contextType);