Working with the new features in 1.4 and finding s...

# language-evolution

[raulraja]

Working with the new features in 1.4 and finding some limitations such as the ability to declare abstract suspend members in fun interface . Is this just a current limitation or something that would not be supported because of the way SAM interop works in the compiler?

fun interface DelimitedContinuation<A, B> {
  suspend operator fun invoke(a: A): B //fails to compile
}

[gildor]

Yeah, it's existing limitation, same way as extending suspend lambda is not allowed now, as I know it's planned to support eventually

I think I saw a related issue

[raulraja]

If I suppress it seems to generate valid bytecode. Will look to see if resolved calls work as well, thanks @gildor

[dmitriy.novozhilov]

https://kotlinlang.slack.com/archives/C0922A726/p1597745905236100?thread_ts=1597741776.234400&cid=C0922A726

[gildor]

ahh, right, I saw this message, not an issue!

[raulraja]

that is great news they are gonna help us with arrow big time, thanks @dmitriy.novozhilov

[efemoney]

@dmitriy.novozhilov if the bug is fixed will we see support for extending “suspend lambdas”?

interface Foo : suspend (Params) -> OutPut

[dmitriy.novozhilov]

Yes, I think so