File: t7872.scala

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scala 2.11.12-6
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trait Cov[+A]
trait Inv[-A]

object varianceExploit {  
  type l[-a] = Cov[a]
  type x = {type l[-a] = Cov[a]}
  def foo[M[_]] = ()
  foo[({type l[+a] = Inv[a]})#l]
}