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kotlinlang

hey guys!
We have updated *kotlin*, *kotlinx* and *ktor* in our project up to versions *1.5.0* and *1.5.4*.
Also we decided to try new *value* classes in requests and responses.
We deployed our changes and have faced next errors:

Untitled

Sounds like it is similar to this problem - <https://kotlinlang.slack.com/archives/C1CFAFJSK/p1621019550451100>

But I m not sure is it *ktor* issue or *coroutines*

if we use *data* class instead of *value* class - everything works perfectly.

The worst part of it, that we can't reproduce it on a sample project, so we face it only in our big project :face_palm:

But may be someone has already faced this issue and can give us any insights :pray:
In a meantime we will try to find a way how to reproduce it on a small project.
Thanks!

Do you have JVM IR disabled in one of the modules?

if you are talking about
```compileKotlin {
    kotlinOptions.useIR = true
}```
we didn't enable it.
our config is:
```compileKotlin {
    sourceCompatibility = "$java_version"
    targetCompatibility = "$java_version"

    kotlinOptions {
        jvmTarget = "$java_version"
        allWarningsAsErrors = true
        freeCompilerArgs += "-Xopt-in=kotlin.RequiresOptIn"
    }
}```


In 1.5, it's enabled by default. My question was only if you explicitly disabled it somewhere, which it seems you didn't.

AFAIK Ktor has not been released yet with a Kotlin 1.5-based version

<https://kotlinlang.org/docs/releases.html#release-details>
```Build info	Build highlights	Recommended kotlinx library versions
1.5.0                           ktor version: 1.5.3```
:shrug:

I know it seems strange but that's what I was told (I was also bitten by it). If it's any indication, Ktor 1.5.3 depends on coroutines 1.4.3:
<https://ktor.io/changelog/1.5/>
(and probably still Kotlin 1.4.21, but I haven't checked that)