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package scala.async
import scala.language.experimental.macros
import scala.reflect.macros.Context
import scala.util.continuations._
object AsyncWithCPSFallback extends AsyncBase {
import scala.concurrent.{Future, ExecutionContext}
import ExecutionContext.Implicits.global
lazy val futureSystem = ScalaConcurrentFutureSystem
type FS = ScalaConcurrentFutureSystem.type
/* Fall-back for `await` when it is called at an unsupported position.
*/
override def awaitFallback[T, U](awaitable: futureSystem.Fut[T], p: futureSystem.Prom[U]): T @cpsParam[U, Unit] =
shift {
(k: (T => U)) =>
awaitable onComplete {
case tr => p.success(k(tr.get))
}
}
override def fallbackEnabled = true
def async[T](body: T) = macro asyncImpl[T]
override def asyncImpl[T: c.WeakTypeTag](c: Context)(body: c.Expr[T]): c.Expr[Future[T]] = super.asyncImpl[T](c)(body)
}
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