Unable to access function arguments in Coroutines

Question

I'm writing a sample application using Kotlin Coroutines. Here is a simple function I've used

fun calculateData(data: Person) {
    println("Calling calculateData()...")
    launch {
       withContext(Dispatchers.IO) {
          println("Obtained data is $data")
          if(person.age > 18) {
           //do some long running calculations based on 'data'
          } 
       }
       println("Some meaningful message")
    }
}

The code compiles and runs OK. However, I don't get the data argument inside the Coroutine. Neither can I debug into withContext block. The message "Obtained data is $data" never gets displayed

Any clue on what prevents me from accessing that argument from within Coroutine?