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kotlinlang

```
launch {
    try {
        async { throw IOException() }.await()
    } catch (e: IOException) {
    }
}
```
I get an uncaught IOException. What is wrong?

```
async {
    try {
        async { throw IOException() }.await()
    } catch (e: IOException) {
    }
}
```
I get no Exception.

This is because `async` is a child of `launch` making it fail imediately.

If the parent is an `async` it is the same, but exception is not logged, because you're supposed to call `await`

Just favor suspending function and you'll be fine

Here's some reading you may find interesting: <https://github.com/Kotlin/kotlinx.coroutines/issues/753>
<https://github.com/Kotlin/kotlinx.coroutines/issues/763>

One need `async` *only* for parallel decomposition. For other uses-cases just use suspending functions (without using `async` at all)