import
language
.
{
existentials
,
higherKinds
,
implicitConversions
}
object
Hello
extends
App
{
  trait
  Arg
  [
  +
  A
  ]
  <:
  Any
  {
  self
  :
  Run
  .
  type
  =>
  type
  Q
  [
  +
  A
  ]
  <:
  A
  }
  object
  Run
  extends
  Arg
  [
  Arg
  [
  Hello
  .
  type
  ]
  #
  Q
  [
  this
  .
  type
  ]
  ]
  implicit
  def
  convert
  (
  a
  :
  Any
  )
  :
  Nothing
  =
  a
  .
  asInstanceOf
  implicit
  val
  put
  =
  (
  a
  :
  Any
  with
  Arg
  [
  _
  ]
  #
  Q
  [
  String
  ]
  )
  =>
  println(
  a
  )
  implicit
  val
  hello
  :
  Any
  with
  Arg
  [
  _
  ]
  #
  Q
  [
  String
  ]
  =
  "hello world"
  .
  asInstanceOf
  [
  Any
  with
  Arg
  [
  _
  ]
  #
  Q
  [
  String
  ]
  ]
  implicit
  def
  run
  (
  implicit
  f
  :
  Any
  with
  Arg
  [
  _
  ]
  #
  Q
  [
  String
  ]
  =>
  Unit
  ,
  a
  :
  Any
  with
  Arg
  [
  _
  ]
  #
  Q
  [
  String
  ]
  )
  :
  Run.type
  =
  {
  f(
  a
  )
  Run
  }
  implicitly
  [
  Run
  .
  type
  ]
}