Why donesn't this compile? ``` fun functionImpl(a:...

# coroutines

[Paul Woitaschek]

Why donesn't this compile?

fun functionImpl(a: Int, b: String) {}

fun nonSuspending(function: (Int, String) -> Unit) {}
fun suspending(function: suspend (Int, String) -> Unit) {}

fun test() {
  nonSuspending(::functionImpl)
  suspending(::functionImpl)
}

[Marc Dietrichstein]

fun suspending requires a suspend function but you pass functionImpl which is not a suspend function

The following code works for example:

fun functionImpl(a: Int, b: String) {}
suspend fun functionImplSuspending(a: Int, b: String) {}

fun nonSuspending(function: (Int, String) -> Unit) {}
fun suspending(function: suspend (Int, String) -> Unit) {}

fun test() {
    nonSuspending(::functionImpl)
    suspending(::functionImplSuspending)
}

[Paul Woitaschek]

I know; but why?

[Paul Woitaschek]

Hm
https://youtrack.jetbrains.com/issue/KT-15917

[Paul Woitaschek]

The design resolution is that conversion from regular functions to suspending function will be supported.

Looks like it will be implemented. But it's from '17. I just refactored several classes from rxjava to flow and this made the migration a pain
@elizarov

[elizarov]

Tentatively in 1.4.0. It requires a new type inference engine.