How stable is the "multiple context receivers" exp...

# arrow

[Alexandru Nedelcu]

How stable is the "multiple context receivers" experimental feature in Kotlin?
Do you foresee any risk in enabling -Xcontext-receivers? 🙂

[simon.vergauwen]

It’s experimental because it’s JVM only atm.

The syntax is also not guaranteed yet, some minor details are still being discuss such as labels, sometimes it doesn’t compile, but changing some code around always fixed it for me.

I don’t expect the syntax to change tbh. Hopefully we’ll get (poly) n-arity with in the Std instead of having to define it ourselves.

[Alexandru Nedelcu]

Yikes, I crashed the compiler due to type inference, I guess not 🙂

e: org.jetbrains.kotlin.backend.common.BackendException: Backend Internal error: Exception during IR lowering
File being compiled: .../UserPatchRequest.kt
The root cause java.lang.RuntimeException was thrown at: org.jetbrains.kotlin.backend.jvm.codegen.FunctionCodegen.generate(FunctionCodegen.kt:51)

[Alexandru Nedelcu]

Just played with context receivers, I'm excited 🤩 but bumped into some sort of type inference bug.

[simon.vergauwen]

Yes, that’s what I meant with sometimes it doesn’t compile but changing the code fixes it 😅 inference sometimes breaks, and heavy `inline`/`suspend` also doesn’t always play nice.

If not had any cases where I couldn’t fix it by explicitly adding types arguments, or explicitly using suspend instead of inline.

I’m super excited for context receivers, and am hoping we’ll get alpha or beta in 2.1 🤞 next year

[CLOVIS]

I don’t expect the syntax to change tbh. Hopefully we’ll get (poly) n-arity with in the Std instead of having to define it ourselves.

I don't think we'll get multi-arity with at all. The with val syntax in the KEEP looks much better to me, but they plan on designing it as a second step. I don't see them introducing multi-arity with with it as a future possibility.

[thanh]

I been using it for almost a year in prod. It works really well ( except type inference errorwhich just need to clean/compile again to work).

[Giulio Caccin]

We finally got it in prod too right after the conference, the entire team is loving it.