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object Test {
class Ctl {
def enable: this.type = { Console.println("enable"); this }
}
class MouseCtl extends Ctl {
def mouseDown(x: Int, y: Int): Unit = { Console.println("mouse down") }
}
def main(args: Array[String]): Unit = {
new MouseCtl().enable.mouseDown(1, 2)
}
}
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