if (activation == null) {
            return;
        }
        class ActivationFrame {
            String location;
            Optional<? extends InputLocationTracker> parent;

            ActivationFrame(String location, Optional<? extends InputLocationTracker> parent) {
                this.location = location;
                this.parent = parent;
            }
        }

import java.util.stream.Collectors;

/**
 * Class InputLocation.
 *
 * @version $Revision$ $Date$
 */
@SuppressWarnings("all")
public final class InputLocation implements java.io.Serializable, Cloneable, InputLocationTracker {

    // --------------------------/
    // - Class/Member Variables -/
    // --------------------------/

    /**
     * The one-based line number. The value will be non-positive if
     * unknown.