Class, trait, impl in different *.scala files?

Question
4

You can also use self types to separate the implementation code into different files:

//T.scala
package foo

sealed trait T {
  ...
}

case class C1(..) extends T with C1Impl
case class C2(..) extends T with C2Impl
case class C3(..) extends T with C3Impl
case class C4(..) extends T with C4Impl

//C1Impl.scala
package foo

private[foo] trait C1Impl { this: C1 => 
  // lots of implementation code
}
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