to
Creates a tuple of type Pair from this and that.
This can be useful for creating Map literals with less noise, for example:
import kotlin.test.*
import java.util.*
fun main(args: Array<String>) {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}