any idea why ```tasks.withType<KotlinCompile&gt...

# announcements

[thana]

any idea why

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs += "-Xjsr305=strict"
        freeCompilerArgs += "-Xopt-in=kotlinx.serialization.ImplicitReflectionSerializer"
        jvmTarget = "1.8"
    }
}

results in
w: Flag is not supported by this version of the compiler: -Xopt=in=kotlinx.serialization.ImplicitReflectionSerializer ?

(kotlin 1.3.61)

[Mike]

I thought opt-in was added in 1.3.70? Prior to that, it was 'experimental' or something along those lines.

[thana]

oh wow thank you, thats it.
The docs unfortunately only say kotlin 1.3 . thank you very much!

[Mike]

NP. Glad to help.

[Mike]

And some feedback for the JB team on docs. Maybe they need a 'Since 1.3.70' type markers on things like this?

[ilya.gorbunov]

You mean on this page: https://kotlinlang.org/docs/reference/opt-in-requirements.html?

[Mike]

Yes, I think so.