なんとなくこんなことしてた

test.scala

class Request()
{
}

class Response()
{
}


type WSGIApp = { def apply(req: Request): Response}


def test(app: WSGIApp) =
  {
    println("hello, world")
  }


def app(aaa: Request): Response =
  {
    new Response
  }


class Test()
{
  def apply(aaa: Request): Response =
    {
      new Response
    }
}


test(app _)
test(new Test)