Hello Arrow folks! I've upgraded to `v0.10.5` and my project failed to compile. I was surprised by t...

# arrow

[Attila Domokos]

Hello Arrow folks! I've upgraded to v0.10.5 and my project failed to compile. I was surprised by this, as it was a patch-level bump.
Looking deeper, I found that EitherT has changed. Do you have some updated examples on how to EitherT with this new version?

Here is one function that fails to compile:

private fun readConfiguration(): EitherIO<T.Configuration> =
        EitherT(IO.fx {
            val config = T.Configuration(
                System.getenv("CLIENT_ID"),
                System.getenv("CLIENT_SECRET"))
            Right(config)
        }.handleError { Left("No CLIENT_ID or CLIENT_SECRET was found") })

The error is: Required: String, Found: ForIO. I've been going through the 0.10.5 changelog, looking at EitherT specific commits, but I couldn't find the cure for this error. Any and all help would be appreciated!

[Jannis]

EitherT has only changed in 2 ways:
• The generic argument order changed: EitherT<F, L, A> -> EitherT<L, F, A>
• The MonadError instance changed from MonadError<EitherTPartialOf<L, F>, E> -> MonadError<EitherTPartialOf<L, F>, L>
Apart from that everything stayed as is

[Attila Domokos]

I did see that. Thanks @Jannis. How could I fix this function I included? Sorry for the newbie q.

[Jannis]

Well how exactly is T.Configuration and EitherTIO defined?

[Attila Domokos]

Sorry, I had EitherIO in my original q, but took it out.
This is `EitherIO`:

typealias EitherIO<A> = EitherT<ForIO, String, A>

And Configuration is a simple data class:

data class Configuration(val clientId: String, val clientSecret: String)

[Jannis]

Ah thats easy then: Just change typealias EitherIO<A> = EitherT<ForIO, String, A> -> typealias EitherIO<A> = EitherT<String, ForIO, A> because the definition changed.

[Attila Domokos]

That worked! Thanks for the support, @Jannis!!