Different behavior with our without a starting 'println' line

[skyluc]

The following worksheet compiles and executes:

package t2237
object CodeInWorksheet {
  println("Something, anything")                  //> Something, anything

  case class A private[A] (i: Int)
  val a1 = A(1)                                   //> a1  : t2237.CodeInWorksheet.A = A(1)
}

While the following fails, with a blinking error:

package t2237
object CodeInWorksheet {
  case class A private[A] (i: Int)
  val a1 = A(1)   // blinking error here
}

It is the result of bug in Scala (SI-8821) and a strange behavior of the worksheet.

The worksheet wraps the code inside the execute method only from the first expression. If the first (and the last) elements of the worksheet are class/object/trait definition, they stay outside of the execute.

Everything should be inside the execute method, otherwise it could some inconsistency, like class and its companion object not in the same context.