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abstract class NullaryTest[T, m[s]] { def nullary: String = "a" val x = nullary def nullary2: T val x2 = nullary2 def nullary3: m[T] val x3 = nullary3 } class Concrete extends NullaryTest[Int, List] { def nullary2 = 1 def nullary3 = List(1,2,3) } object test { (new Concrete).nullary2 (new Concrete).nullary3 }