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ConnorDoyle/variance.scala

Last active August 29, 2015 14:06
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variance.scala
type Function1[-A,+B]
case class A(x: Int)
case class B(x: Int) extends A(x)
val alpha: A => Unit = { a => ??? }
val beta: B => Unit = { b => ??? }
def gamma(f: B => Unit) = ???
type Set[+A]
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