File: t3855.scala

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scala 2.11.12-6
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object Test {
  def byval[A](a: => A) = a
  def closure[A](f: () => A) = f()

  def f1(s: String) = {
    var n = try { s.toInt } catch { case _: Throwable => 1 }
    byval(n)
  }
  def f2(s: String) = {
    var n = try { s.toInt } catch { case _: Throwable => 1 }
    closure(() => n)
  }

  def main(args: Array[String]) = {
    val sum = f1("12") + f2("the witch is dead")
    assert(sum == 13)
  }
}