File: patmat-extract-tparam.scala

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scala 2.11.12-6
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trait Bip[T] { def h: T }
trait BoolBip extends Bip[Boolean]

class A {
  def g(x: Boolean): Unit = ()
  def f(xs: List[Bip[_]]) = xs foreach { case x: BoolBip => g(x.h) }
}

class B {
  def g(x: Boolean): Unit = ()
  def g(x: Int): Unit = ()
  def f(xs: List[Bip[_]]) = xs foreach { case x: BoolBip => g(x.h) }
}