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