Can we use kotlin contracts to specify at least one of the lambda block will be executed in kotlin?

Question

I have a function as follows.

fun handleResult(
    onSuccess:() -> Unit,
    onFailure:() -> Unit
){


}

Is there a way to specify kotlin compiler that one of the blocks between 2 is sure to be executed only once?

Usage:: I want a variable to be initialized by the handleResult block..

val isSuccess : Boolean
handleResult(
   onSuccess = {
      isSuccess= true
   },
   onFailure = {
      isSuccess = false
   }
)