colors-wrapped.scala

// When you run "scala colors.scala", it's like you compiled the following script,
// where the contents of colors.scala is embedded inside the "new Anyref {...}".
object Script {
  def main(args: Array[String]): Unit = {
    new AnyRef {
      // If you change "object" to "class" and remove the
      // "type Color = Value" declaration, it compiles.
      class Color extends Enumeration {
        type Color = Value
        val Empty  = Value
        val Blue   = Value
        val Yellow = Value
        val Red    = Value
        val Green  = Value
      }

      class Board {
        val grid = Array.fill(20, 20)(Color.Empty)
      }
      // I added these two statements:
      val b = new Board
      println(b.grid)
    }
  }
}

colors.scala

object Color extends Enumeration {
  val Empty  = Value
  val Blue   = Value
  val Yellow = Value
  val Red    = Value
  val Green  = Value
}

class Board {
  val grid = Array.fill(20, 20)(Color.Empty)
}

/*

==== Output when I run on the cmd line is below:

% ~/Projects/scala-2.8.0.Beta1-prerelease/bin/scala colors.scala
(fragment of colors.scala):10: error: private object Color escapes its defining scope as part of type Array[Array[this.Color.Value]]
  val grid = Array.fill(10, 10)(Color.Empty)
       ^
one error found
!!!
discarding <script preamble>

==== In REPL is fine:

% ~/Projects/scala-2.8.0.Beta1-prerelease/bin/scala 
Welcome to Scala version 2.8.0.Beta1-prerelease (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_17).
Type in expressions to have them evaluated.
Type :help for more information.

scala> object Color extends Enumeration {
     |   val Empty  = Value
     |   val Blue   = Value
     |   val Yellow = Value
     |   val Red    = Value
     |   val Green  = Value
     | }
defined module Color

scala> 

scala> class Board {
     |   val grid = Array.fill(10, 10)(Color.Empty)
     | }
defined class Board

scala> (new Board).grid
res0: Array[Array[Color.Value]] = Array(Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty), Array(Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty))

*/