Stacktrace recovery doesn't work for suspend main

I took the example https://raw.githubusercontent.com/Kotlin/kotlinx.coroutines/master/kotlinx-coroutines-debug/test/RecoveryExample.kt and add at line 16 a println("${Thread.currentThread().name}"), so I get

package example

import kotlinx.coroutines.CoroutineName
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.async

object PublicApiImplementation : CoroutineScope by CoroutineScope(CoroutineName("Example")) {

    private fun doWork(): Int {
        error("Internal invariant failed")
    }

    private fun asynchronousWork(): Int {
        println("${Thread.currentThread().name}")
        return doWork() + 1
    }

    public suspend fun awaitAsynchronousWorkInMainThread() {
        val task = async(Dispatchers.Default) {
            asynchronousWork()
        }

        task.await()
    }
}

suspend fun main() {
    // Try to switch debug mode on and off to see the difference
    PublicApiImplementation.awaitAsynchronousWorkInMainThread()
}

I run it with

1. -ea
2. -Dkotlinx.coroutines.debug -Dkotlinx.coroutines.stacktrace.recovery=true
3. -Dkotlinx.coroutines.debug

I never get an recovered stacktrace. How ever I got DefaultDispatcher-worker-1 @Example#1 so -Dkotlinx.coroutines.debug seems to work.

What does I’m missing? Here my version kotlin 1.3.41 coroutines.version 1.2.2

[qwwdfsad]

As a workaround, you can use fun main() = runBlocking { ... } instead of suspend fun main()

[opensource21]

If you clone https://gitlab.com/ppiag/zulipbot, rename application.properties.sample to application.properties and replace zulip.url=https://####.zulipchat.com with zulip.url=https://www.zulipchat.com and start BotRunner , I guess you have a different situation with ktor and it doesn’t work. Unfortunately it’s not so easy to debug 😦

Any idea when 1.3 will be released or a beta for a test?