Return from outer function

1

I have tried return from outer function: 

fun s(x : Int) : Int{
    var sn = 0;
    fun s1()
    {
        sn += 1
        if( sn > 3)
            return@s 3
    }
    for (i in 1..x)
        s1()
    return sn
}

But I have error: Error:(7, 13) Kotlin: 'return' is not allowed here

Why?
I don’t see big difference from example at http://confluence.jetbrains.com/display/Kotlin/Functions:


fun reachable(from : Vertex, to : Vertex) : Boolean { 



  val visited = HashSet<Vertex>() 



  fun dfs(current : Vertex) { 



    // here we return from the outer function: 



    if (current == to) return@reachable true 



    // And here – from local function: 



    if (!visited.add(current)) return 



    for (v in current.neighbors) 



      dfs(v) 



  } 


 



  dfs(from) 



  return false // if dfs() did not return true already 



}

2

The docs are somewhat outdated. Non-local returns are not supported yet, and will probably never be supported for this case, only for inline functions.

3

Is link to a discuss about this?

I think it is useful feauture for helper-functions.

I have tried inline function:

fun s(x : Int) : Int{

  var sn = 0;

  inline fun s1()

  {

  sn += 1

  if( sn > 3)

            return@s 3

  }

  for (i in 1…x)

  s1()

  return sn

}


fun main(args : Array<String>) {

  println(s(4))

}


but have error at line “inline fun s1()”:
Error:(7, 11) Kotlin: Unexpected tokens (use ‘;’ to separate expressions on the same line)

4

As mentioned above, this feature is not yet implemented. To make a local function inline, surround "inline" by square brackets

5

If I right understand the future (return from outer function) was in kotlin, then it was remove from the language.

Why it was remove?

6

It was never implemented

7

what about now?
since 3 years ago until now
is it implemented? because it could be very useful.

8

Non-local returns are not on the table, but local inline functions are. You are welcome to add your use-case here: https://youtrack.jetbrains.com/issue/KT-17579