Kotlin contracts

sample-do-once-without-contracts.kt

/**
 * @author Adib Faramarzi (adibfara@gmail.com)
 */

fun createOnce(runFunction: ()-> Unit) {
    runFunction()
}

fun getKotlinVersion(): Float{
    val kotlinVersion: Float
    createOnce {
        kotlinVersion = 1.3f
    }

    // The line below generates the error (and does not compile):
    // Captured values initialization is forbidden due to possible reassignment
    return kotlinVersion
}