[Question] Either union like from Dartz

[petrnymsa]

In Dartz package we have Either<L,R> type to represent either L type or R type.
I thought that this should mimic this behavior

@immutable
abstract class Either<L, R> with _$Either<L, R> {
  const factory Either.left(L left) = Left;
  const factory Either.right(R right) = Right;
}

and usage

void run(Either<int, String> either) {
  either.when(left: (value) => print(value), right: (value) => value);
}
---
run(Left(10));

However, I am getting the following error

lib/either.dart:7:39: Error: The constructor function type 'Left<dynamic, dynamic> Function(dynamic)' isn't a subtype of 'Either<L, R> Function(L)'.
 - 'Left' is from 'package:sandbox/either.dart' ('lib/either.dart').
 - 'Either' is from 'package:sandbox/either.dart' ('lib/either.dart').
  const factory Either.left(L left) = Left;
                                      ^
lib/either.dart:8:41: Error: The constructor function type 'Right<dynamic, dynamic> Function(dynamic)' isn't a subtype of 'Either<L, R> Function(R)'.
 - 'Right' is from 'package:sandbox/either.dart' ('lib/either.dart').
 - 'Either' is from 'package:sandbox/either.dart' ('lib/either.dart').
  const factory Either.right(R right) = Right;
                                        ^

Am I doing something wrong? Or should it be possible to create this? Thanks for any help.

[rrousselGit]

The syntax is:

@immutable
abstract class Either<L, R> with _$Either<L, R> {
  const factory Either.left(L left) = Left<L, R>;
  const factory Either.right(R right) = Right<L, R>;
}

[petrnymsa]

@rrousselGit Thank you, really stupid mistake :)

We can close this issue. And thank you for really great package