copy method
Returns a shallow copy of the receiver.
Override this method in all subclasses, return its own type.
Implementation
@override
PermuteParser<R> copy() => PermuteParser<R>(delegate, indexes);
Returns a shallow copy of the receiver.
Override this method in all subclasses, return its own type.
@override
PermuteParser<R> copy() => PermuteParser<R>(delegate, indexes);