“futures.sc” value onSuccess is not a member of scala.concurrent.Future[Int]

[byejude]

script's location is .\src\main\scala\progscala2\typelessdomore/futures.sc

when i load the script ,its console print 'error: value onSuccess is not a member of scala.concurrent.Future[Int]'

and i use
future onComplete { case Success(x) => println(s"success and return is $x") case Failure(t) => println(s"An error has occured: $t" ) }
to replace it,its run sucessful,and i dont know why
i use scala 2.13.1

[deanwampler]

Thanks for pointing this out. I don't have automated tests yet for the scripts. I plan to add them while working on the third edition of the book.

The old onSuccess and onFailure methods were deprecated in 2.12 and removed in 2.13. I just pushed a change to the file that uses the onComplete method like you used it.