gistfile1.kt

class GlobalCase {
    fun someFun(): Unit {}

    fun String.stringFun() {

    }
}

fun main(args: Array<String>) {
    val test: String = File("sadfasd").readText()

    "asdfasdf".clousereFun {
        someFun()

        "some string".stringFun()
    }

}

fun String.clousereFun(testFun: GlobalCase.() -> Unit): Unit {
    val object1 = GlobalCase()

    object1.testFun()
}