in my understanding, the first code fragment should behavior the same as the latter one, coz launch ...

# coroutines

[Natsuki(开元米粉实力代购)]

in my understanding, the first code fragment should behavior the same as the latter one,
coz launch w/o explicit receiver adds the new created coroutine as a child of current coroutine, so cancel the collectLatest block will cause the child coroutine to cancel, which should leads to the same result as the latter code fragment

[knthmn]

I assume in both examples, you are wrapping the call in something that provides a CoroutineScope as a receiver (e.g. runBlockng()). In the first example, the launch is from the CoroutineScope receiver, i.e. it is equivalent to

fun main() = runBlocking { // this: CoroutineScope
    flow {
       // ...
    }.collectLatest { value ->
        [e-mail] { // (coroutineScope from runBlocking).launch()
            println("start: $value")
            while(true) {
                delay(200L)
                println("loop: $value")
            }
        }
    }
}

which it just launches the Job and returns in collectLatest() instantly and never canceled by collectLatest(). However, in the second case, coroutineScope() provides the CoroutineScope of the current coroutine, which is the one provided by collectLatest() and can be cancelled by it.

[Natsuki(开元米粉实力代购)]

thats exactly the case, thank you