@Override
public final <T> T accept(ExpressionVisitor<T> visitor) {
List<T> l = acceptChildren(visitor, visitor.visitEnter(this));
T t = visitor.visitLeave(this, l);
if (t == null) {
t = visitor.defaultReturn(this, l);
}
return t;
}
@Override
public final <T> T accept(ExpressionVisitor<T> visitor) {
return visitor.visit(this);
}