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but what are implementations of _blocking_ File IO which should be run _in_ a coroutine?

i.e., _suspending_ functions which allow for File I/O

Not sure if I understand what you are asking, but if you use the <http://Dispatchers.IO|Dispatchers.IO> context that should work for you

You take the blocking IO stuff like read the contents of a file and execute inside of the <http://Dispatchers.IO|Dispatchers.IO> context using `withContext(<http://Dispatchers.IO|Dispatchers.IO>) { }`. And then you just program your asynchronous code like you would with coroutines.

```
launch {
    val text = withContext(<http://Dispatchers.IO|Dispatchers.IO>) { someFile.readText() }

    println(text)
}
```

<https://github.com/Kotlin/coroutines-examples/blob/master/examples/sequence/sequenceOfLines.kt>

This is an example of reading lines with suspending functions. Basically you read a line and yield to let other coroutines do their job instead of reading everything in one go.