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import scala.collection.mutable.ListBuffer
object Test1 {
class Box[T](x: T)
def box[T](x: T) = new Box[T](x)
class C[T] { def x: T = ???; def x_=(y: T): Unit = ??? }
val c: C[Int] = ???
val d: C[Float] = ???
val xs: List[C[_]] = List(c, d)
xs(0).x = xs(1).x // error
}
object Test {
def main(args: Array[String]): Unit = {
val f: ListBuffer[Int] = ListBuffer(1,2)
val g: ListBuffer[Double] = ListBuffer(3.0,4.0)
val lb: ListBuffer[ListBuffer[_]] = ListBuffer(f, g)
lb(0)(0) = lb(1)(0) // error
val x: Int = f(0)
}
}
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