In the above code snippet, how does Kotlin compiler know that collect in line #10 is to be invoked on the instance of the flow on which merge is invoked?

Isn’t this in line #10 referring to CoroutineScope as hinted in line #9 by the compiler?

Code snippet for reference

fun <T> Flow<T>.merge(other: Flow<T>): Flow<T> = channelFlow {
    launch {
        collect { send(it) }
    }
    other.collect { send(it) }
}