Unexpected "overloaded method needs result type" due to #4971

[adriaanm]

trait Bijection[A, B] extends (A => B) {
   def andThen[C](g: Bijection[B, C]): Bijection[A, C] = ???
   def compose[T](g: Bijection[T, A]) = g andThen this
}

// <console>:14: error: overloaded method compose needs result type
// def compose[T](g: Bijection[T, A]) = g andThen this
//                                        ^

adriaanm/util@78f8eef

[adriaanm]

dupe (see #157)