File: t5845.scala

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scala 2.11.12-6
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class Num[T] {
  def mkOps = new Ops
  class Ops { def +++(rhs: T) = () }
}

class A {
  implicit def infixOps[T, CC[X] <: Num[X]](lhs: T)(implicit num: CC[T]) = num.mkOps
  implicit val n1 = new Num[Int] { }
  println(5 +++ 5)
}

class B {
  implicit def infixOps[T, CC[X] <: Num[X]](lhs: T)(implicit num: CC[T]) : CC[T]#Ops = num.mkOps
  implicit val n1 = new Num[Int] {}
  println(5 +++ 5)
}