suspendAsyncInfix2.kt

fun saveUsernameAndPassword(username: String, password: String) {

    val result = StorageService.getInstance()::saveUsernameAndPassword suspendAndInvokeWith Pair(username, password)
    handleResult(result)
}

private suspend infix fun <Input1, Input2, Output> ((Input1, Input2, (Output) -> Unit) -> Unit).suspendAndInvokeWith(pair: Pair<Input1, Input2>): Output {
    return suspendAsync(this, pair.first, pair.second)
}