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object Tennis { | |
// A Typesafe solution for http://codingdojo.org/cgi-bin/wiki.pl?KataTennis | |
sealed trait Player | |
case class Player1() extends Player | |
case class Player2() extends Player | |
sealed trait Score | |
case class NScore [+P <: Score]() extends Score() | |
type Score0 = NScore[Score] |