presto-parser/src/main/java/io/prestosql/sql/tree/RevokeRoles.java/RevokeRoles/RevokeRoles
class RevokeRoles:    private RevokeRoles(
            Optional<NodeLocation> location,
            Set<Identifier> roles,
            Set<PrincipalSpecification> grantees,
            boolean adminOptionFor,
            Optional<GrantorSpecification> grantor)
    {
        super(location);
        this.roles = ImmutableSet.copyOf(requireNonNull(roles, "roles is null"));
        this.grantees = ImmutableSet.copyOf(requireNonNull(grantees, "grantees is null"));
        this.adminOptionFor = adminOptionFor;
        this.grantor = requireNonNull(grantor, "grantor is null");
    }