in src/main/scala/com/twitter/stitch/Arrow.scala [1814:1826]
def applyPure(t: Try[T]): Try[T] = {
t match {
case Return(v) =>
try {
f(v)
} catch {
case e: NonLocalReturnControl[_] => throw new StitchNonLocalReturnControl(e)
case NonFatal(_) =>
}
case _ =>
}
t
}