In the structured concurrency example for Android (https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md#structured-concurrency-lifecycle-and-coroutine-parent-child-hierarchy),

Dispatchers.Main

is added to the

job

to make it so the dispatcher used for child coroutine builders will be

Dispatchers.Main

(correct me if I'm wrong). Which dispatcher is used if the

+ Dispatchers.Main

portion is omitted?

override val coroutineContext: CoroutineContext 
    get() = job

The default one is used by default

That's what I speculated but it wasn't immediately obvious looking through the source code. Thanks for confirming!