void LensCompositionTet()
{
var moveTurtle = from x in TurtleX.ModS(x => x + 10)
from y in TurtleY.ModS(y => y + 10)
select Tuple.Create(x, y);
var turtle1 = new Turtle("bob", new Position(x: 10, y: -2));
var result = moveTurtle.Run(turtle1);
Console.WriteLine(result);
Assert.AreEqual(result.Item2.Item1, 20);
Assert.AreEqual(result.Item2.Item2, 8);
}
public static StateEither <ParserState <T>, string, uint> MoveNext()
{
return
(Index.ModS(n => n + 1).ToStateEither <ParserState <T>, string, uint>());
}
