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Covariance in Kotlin
class CovarianceSample<T>
fun main() {
val firstSample: CovarianceSample<Any> = CovarianceSample<Int>() // Error: Type mismatch
val secondSample: CovarianceSample<out Any> = CovarianceSample<String>() // OK , String is a subtype of Any
val thirdSample: CovarianceSample<out String> = CovarianceSample<Any>() // Error: Type mismatch
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