public class TreatTest extends BaseCoreFunctionalTestCase {

    @Override
    public String[] getMappings() {
        return new String[] { "hql/Animal.hbm.xml" };
    }

    @Test
    public void memberOfTreatTest() {
        final Session s = openSession();

        s.createQuery( "select pet"
                + " from Animal pet, Animal owner"
                + " where pet member of treat (owner as Human).pets"
        );

        s.close();
    }

}

org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: ( near line 1, column 114 [select pet from org.hibernate.test.hql.Animal pet, org.hibernate.test.hql.Animal owner where pet member of treat (owner as Human).pets]
	at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:91)
	at org.hibernate.hql.internal.ast.ErrorCounter.throwQueryException(ErrorCounter.java:109)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:304)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:203)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:158)
	at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:126)
	at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:88)
	at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:167)
	at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:301)
	at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:239)
	at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1800)
	at org.hibernate.test.hql.TreatTest.memberOfTreatTest(TreatTest.java:46)