First compile with the latest alpha: `Caused by: java.lang.IllegalArgumentException: No argument for...

# arrow

[dave08]

First compile with the latest alpha: Caused by: java.lang.IllegalArgumentException: No argument for parameter VALUE_PARAMETER CONTINUATION_CLASS name:$completion index:3 type:kotlin.coroutines.Continuation<kotlin.collections.List<...

[simon.vergauwen]

Never seen that before, does it give any indication on what piece of code this is occurring on? I have several projects on the alpha.28.

[dave08]

Yes, and I'm trying to use context(Raise...) on it.

[dave08]

(and it has = coroutineScope {... in it's definition...)

[dave08]

Maybe that's what's causing it?

[Stylianos Gakis]

Try by making it a normal non expression function and let’s see 👀

[dave08]

Nope... that's not it.

[dave08]

I removed the context<Raise<...>> and replaced it with an either { } block, and then it compiled...

[dave08]

I posted the stacktrace in a DM to @simon.vergauwen

[simon.vergauwen]

Replaced it with an either { } block, and then it compiled...

Yes, that's definitely a bug in the compiler related to context receivers.

[simon.vergauwen]

Also the reason why I wrote the webinar of last Thursday all without context receivers 😅 😭 😭

[dave08]

Oh, so this is a known bug? Is this in all the alphas?

[simon.vergauwen]

This is related to the Kotlin Compiler, not Arrow. Context receivers is still experimental, and not stable.

[dave08]

Ah, so I guess that's why I saw you use some regular receivers with Raise...

[simon.vergauwen]

Yes, exactly. In the webinar last week I refrained from using context receivers anywhere, and thus I mixed Either and Raise<E> in some places to refrain from using them.

They seamlessly interop, and you can whatever you want wherever. So when I was working with Resource<Either<E, A>> then I used suspend fun ResourceScope.example(): Either<E, A> and otherwise I used Raise<E>.

[simon.vergauwen]

I felt that I couldn't suggest or talk too much context receivers since they're not stable for some time.