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Hello cross posting here since it seems to be a better channel for asking.
The stack trace is the following
```e: Compilation failed: IrTypeAliasSymbol expected: Unbound public symbol for public kotlinx.coroutines/CancellationException|null[0]
 * Source files: 
 * Compiler version info: Konan: 1.5 / Kotlin: 1.5.0
 * Output kind: STATIC_CACHE
e: java.lang.IllegalStateException: IrTypeAliasSymbol expected: Unbound public symbol for public kotlinx.coroutines/CancellationException|null[0]```
<https://kotlinlang.slack.com/archives/C3PQML5NU/p1620671651034400>

Hello. Most likely, the reason for this exception is ABI-breaking <https://github.com/Kotlin/kotlinx.coroutines/commit/44ebdef31eebc47544b447cfcecef0137575f0a1#diff-b102711a8961af50e15c843881422c205ae86355ef051cee9895c620ddd7513cR13|change> in kotlinx-coroutines 1.5.0-rc.
Your project probably has a dependency that was built against older version of coroutines.

Thank you <@UBU9TA6ET>
I’m not sure I know how to detect which library could cause that though. Is there an easy way to detect dependencies that breaks the binary compatibility?

Probably, the easiest way I am aware of is to run `./gradlew dependencies` and check that all versions of kotlinx-coroutines in direct and transitive dependencies are either 1.4.3 (and earlier) or 1.5.0-rc.

Seeing same issue here.  I've forced use of in my case `1.5.0-native-mt` version and do see this for transitive dependencies....but I guess there could still be some in compatibility?

```org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.3-native-mt -&gt; 1.5.0-native-mt```

(latest version of `ktor` for example still depends on `1.4.3-native-mt`)

I'm having this same problem, using the latest ktor 1.5.4. Hopefully a new build with 1.5 will be out soon.

<@UMCJ3C57V>, it's an <https://github.com/Kotlin/kotlinx.coroutines/commit/44ebdef31eebc47544b447cfcecef0137575f0a1#diff-b102711a8961af50e15c843881422c205ae86355ef051cee9895c620ddd7513cR13|binary incompatibility> in newer version of coroutines. Ktor 1.5.4 klib depends on declaration that is declared in coroutines 1.4.3 (`CancellationException` as class), but missing in 1.5.0-rc (because `CancellationException`  is now typealias to another declaration), so forcing dependency won't help here. Linker can't find "`CancellationException` as class" in the set of dependencies, because only one version of library (the latest one) is passed to the compiler from Gradle.

thanks <@UBU9TA6ET>, so just to clarify...we can't use current Ktor release with Kotlin 1.5 when using Kotlin/Native?

Honestly, I didn't check myself, so I don't know for sure. But if kotlinx-coroutines 1.4.3 are compatible with Kotlin 1.5 then you should be fine by sticking to that version of coroutines and Ktor 1.5.4.

ok, I think mistakenly thought you had to use kotlinx-coroutines 1.5  with Kotlin 1.5 (at least when using Kotlin/Native)

Using ktor 1.6.0 with kotlin 1.5.10 and kotlinx coroutines 1.5.0-native-mt leads to successful compilation for me at least :raised_hands: