File: bug788.scala

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scala 2.3.0-1.1
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package test;

trait Test {
  type Node <: NodeImpl;
  trait NodeImpl;
  type Expression <: Node with ExpressionImpl;
  trait ExpressionImpl extends NodeImpl { 
    def self : Expression;
  }
  type Named <: Node with NamedImpl;
  trait NamedImpl extends NodeImpl {
    def self : Named;
  }
  def asExpression(e : ExpressionImpl) : Named = {
    e match {
    case f : NamedImpl => f.self;
    case _ => null;
    }
  }
}