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object Test extends App {
implicit def anyList[T]: List[T] = Nil
implicit def intList: List[Int] = 42::24::Nil
def foo[T](implicit x: T) = x
val s = foo[List[Int]]
println(s) // correct - prints "List(42, 24)"
implicit def tupleList[T](implicit t: List[T]): List[(T,T)] = t.map(x => (x,x))
val t = foo[List[Tuple2[Int,Int]]]
println(t) // incorrect - prints "List()"
}
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