compilation - scala: list.flatten: no implicit argument matching parameter type (Any) = > Iterable[Any] was found -

Compiling this code in scale 2.7.6:

  def flatten1 (L: List [any]): list [any] = l.flatten  

I get an error:

  parameter type (any) = any The underlying argument matches & gt; Iterable [Any] got  

Why?

If you have list (1, 2, 3, 4, 5) In the "flatten" list (1, 2, list (3,4), 5) you are expecting to be able to, , then you need something like:

  built-in def any2iterable [A] (A: A): Iterable [A] = some (A)  

with list:

  Val inventory: list [alt [int]] = list (1, 2, list (3,4), 5) conversion to print / print (list.flatten (IRR => IRR)) // list ( 1, 2, 3, 4, 5)  

Edit : The answer was as long as the OP did not clarify his question in a comment on Mitch's answer

You what are you expecting when you leave Flaton a list [int] ? Do you want to add the function int s to list ? If so, you should see the new execution functions in 2.8.x :

  val list = list (1, 2, 3) println (list.sum) ) // 6