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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) }
}
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