text: class Foo {
    implicit def pair2fun2[A, B, C](f: (A, B) => C) = 
       {p: (A, B) => f(p._1, p._2) }
  
    def foo(f: ((Int, Int)) => Int) = f
    def bar(x: Int, y: Int) = x + y 
  
    foo({ (x: Int, y: Int) => x + y }) // works
    foo(pair2fun2(bar _)) // works
    foo(bar _) // error
    foo(bar)   // same error
  }
  