Fix #42 - Futures created by async are not properly completed with exceptions

This augments the on-complete handler for an async state with await as follows:

    if (tr.isFailure)
      result$async.complete(tr.asInstanceOf[Try[T]])
    else {
      <resultName> = tr.get.asInstanceOf[<resultType>]
      <nextState>
      <mkResumeApply>
    }

1 files changed, 2 insertions, 0 deletions

diff --git a/src/main/scala/scala/async/TransformUtils.scala b/src/main/scala/scala/async/TransformUtils.scala
index 5b1fcbe..7571f88 100644
--- a/src/main/scala/scala/async/TransformUtils.scala
+++ b/src/main/scala/scala/async/TransformUtils.scala
@@ -155,6 +155,8 @@ private[async] final case class TransformUtils[C <: Context](c: C) {
     }
 
     val Try_get       = methodSym(reify((null: scala.util.Try[Any]).get))
+    val Try_isFailure = methodSym(reify((null: scala.util.Try[Any]).isFailure))
+
     val TryClass      = c.mirror.staticClass("scala.util.Try")
     val TryAnyType    = appliedType(TryClass.toType, List(definitions.AnyTpe))
     val NonFatalClass = c.mirror.staticModule("scala.util.control.NonFatal")