File: td3651.scala

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scala 2.11.12-6
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class Base[@specialized(Double) A](val a: A)

class Derived(override val a: Double) extends Base[Double](a)

object Test {
  def main(args: Array[String]) {
    val b: Base[Double] = new Derived(10)
    b.a
    println(runtime.BoxesRunTime.doubleBoxCount)

    val der = new Derived(10)
    der.a
    println(runtime.BoxesRunTime.doubleBoxCount)
  }
}