import java.lang.reflect.TypeVariable;
import javax.annotation.CheckForNull;

/**
 * Captures a free type variable that can be used in {@link TypeToken#where}. For example:
 *
 * <pre>{@code
 * static <T> TypeToken<List<T>> listOf(Class<T> elementType) {
 *   return new TypeToken<List<T>>() {}
 *       .where(new TypeParameter<T>() {}, elementType);
 * }
 * }</pre>
 *
 * @author Ben Yu
 * @since 12.0
 */
@ElementTypesAreNonnullByDefault