I dont understand this. The warning says suspending fun has a CoroutineScope receiver, but the second class fails to find the "launch" method. Is this a bug or am i really misunderstanding this?

Not sure exactly what you're trying to do, but

class Test{
 suspend fun test() = coroutineScope{
 launch{ do things}
}
}

might be what you're looking for

Well, i'm trying to use coroutines with JavaFX, but that doesnt seem to be very usual and i didnt find much on it apart from the Dispatchers.JavaFX (or Main) One elegant solution i found was to make my components extend the CoroutineScope and clear it accordingly to javafx components lifecycle The classes were minimal reproducers But regardless of what i'm trying to do, i still dont quite understand the warning. Why cant i call launch from a suspending function?

Your outer class "test" implements coroutinescope, so launch in your function is

this.launch

You are already in a suspend function. There is no need to

launch

a coroutine. That's what the warning is telling you.

I dont think thats it @Chrimaeon

suspend fun test() {
 launch{ do things}
 do other things
}

What if i wanted this? It would still show a warning

To get access to coroutine scope in suspending function you can do

suspend fun test() {
  coroutineScope {
    // access scope here
  }
}

Sure, but then also you’ll need to wrap the

launch

in a “new”

coroutineScope{}

like already mentioned, to give the job it’s own inner scope

Yeah i think i was misunderstanding some basic concepts about context vs scope

withContext provides a coroutineScope in the block and doesn't require one to run

Implementing CoroutineScope is the problem. Should have a private property instead, and use

coroutineScope { }

inside suspend functions.