@Override
    public void addStart(final Traverser.Admin<S> start) {
        //noinspection unchecked
        this.pass = this.predicate.test(this.s = start.get());
    }
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/lambda/PredicateTraversal.java