object Foo {
  import scala.util.continuations._
  def throwException():Unit @suspendable =
    throw new Exception

  // OK!
  def f1() = {
    val a = 5
    if (a != 3) {
      throwException()
    } else {
      shiftUnit0[Unit, Unit]()
    }
  }

  // Error!
  def f2() = {
    val a = 5
    if (a != 3) {
      throw new Exception
    } else {
      shiftUnit0[Unit, Unit]()
    }
  }
}

<console>:28: error: then and else parts must both be cps code or neither of them
           if (a != 3) {
           ^