What does “outer =>” really mean?

Is there any documentation on the "outer =>" feature? It looks like a self type annotation with an infered type. However I have the feeling that I am wrong.

If it would be the case, is it only a different way to express access to super?

trait A extends (B => C) {
  outer =>
  def apply(x: B): C = outer(x)


Not super, but the outer scope. It's a way to aliasing different scopes. For example:

class A(val x:Int) { thisA =>
 class B { 
   val x = 2 
   val y = x + thisA.x // without thisA how could we use A.x instead of B.x ? (*)

There is a better illustration here.

(*) There exist another way to have the same effect, but it's beyond this question.

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