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class Box[X <: CharSequence](val x: X) extends AnyVal {
def map[Y <: CharSequence](f: X => Y): Box[Y] =
((bx: Box[X]) => new Box(f(bx.x)))(this)
override def toString = s"Box($x)"
}
object Test {
def main(args: Array[String]): Unit = {
val g = (x: String) => x + x
println(new Box("abc") map g)
}
}
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