Juan Manuel Serrano jserranohidalgo
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| trait FlightStatus | |
| trait Flying extends FlightStatus | |
| trait Landed extends FlightStatus | |
| case class Plane[Status <: FlightStatus]() | |
| def land(p:Plane[Flying])=Plane[Landed]() | |
| def takeOff(p:Plane[Landed])= Plane[Flying]() | |
| val plane = new Plane[Landed]() |