File: sensitive.scala

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scala 2.11.12-6
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class Certificate{}

object Admin extends Certificate;

class SecurityViolationException extends Exception

object Sensitive {
  def makeSensitive(credentials: Certificate): Sensitive =
    if (credentials == Admin) new Sensitive()
    else throw new SecurityViolationException
}
class Sensitive private () {
}

object Attacker {
  val x = Sensitive.makeSensitive(null)
  val y = new Sensitive()
}