nope.scala

//> using scala "3.3.0"

import scala.concurrent.*, ExecutionContext.Implicits.global, duration.*
import scala.util.boundary, boundary.*

def runsOnAnotherThread(msg: String): Future[Unit] = 
  Future:
    println(s"This: $msg runs on ${Thread.currentThread.getName}")

def runTest(): Future[String] = 
  boundary:
    for
      _ <- runsOnAnotherThread("first")
      _ = break(Future.successful("after first"))
    yield "after yield"

@main def main = 
  val fut = runTest()
  Await.ready(fut, Duration.Inf)
  println(fut)