object Main extends Application {
  // Closures version
  def c(): ( Boolean ) => Int = {
    {
      ( b: Boolean ) => if ( b ) {
        return { ( bb: Boolean ) => 1 } // This is a mistake, but not caught by the compiler
      }
      2
    }
  }
 
  // OO version
  def oo(): Function1[Boolean, Int] = {
    return new Function1[Boolean, Int]() {
      override def apply( b: Boolean ): Int = {
        if ( b ) { return 1 } // Can't by mistake say return new Function1 ...
        2
      }
    }
  }
 
  // Main
  {
    println( oo()( true ) )
    println( c()( true ) )
  }
}