[Are context-receivers available in Kotlin/Native?] :thread:

# kotlin-native

[Jonas TM]

[Are context-receivers available in Kotlin/Native?] 🧵

[Jonas TM]

I am trying to test out context-receivers in Kotlin/Native
• Target: macosArm64
• Kotlin: 1.7.10
I added the feature flag to my build.gradle.kts

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xcontext-receivers")
    }
}

But when I run the program via :runDebugExecutable I get the following error while compiling:

The feature "context receivers" is experimental and should be enabled explicitly

[Sebastian Sellmair [JB]]

Not on my machine rn. Replace KotlinCompile with something like KotlinNativeCompile

[Jonas TM]

Thanks using KotlinNativeCompile class helped get rid of that error.

[Sebastian Sellmair [JB]]

KotlinCompile is only the task for JVM. When the task was named, there was no native

[russhwolf]

I think AbstractKotlinCompile gets you all platforms if that’s what you need

[Jonas TM]

Could it be that context receivers are currently broken?

Created the following simple sample:

fun main() {
    with(BasicLogger()) {
        test()
    }
}

context (LoggingContext)
fun test() {
    log("hello world")
}

interface LoggingContext {
    fun log(msg: String)
}

class BasicLogger() : LoggingContext {
    override fun log(msg: String) {
        println(msg)
    }
}

But getting the following compile error:

e: java.lang.IllegalStateException: FULL: FUN name:test visibility:public modality:FINAL <> (<this>:de.tm.jonas.LoggingContext) returnType:kotlin.Unit
 Ir: de.tm.jonas#test(de.tm.jonas.LoggingContext){}
 Descriptor: de.tm.jonas#test!de.tm.jonas.LoggingContext(){}

	at org.jetbrains.kotlin.backend.common.serialization.mangle.ManglerChecker$visitDeclaration$2.invoke(ManglerChecker.kt:96)
 ...

[sergey.bogolepov]

Context receivers are JVM-only at the moment.

[Jonas TM]

Ok so if it is not supported why is the compiler not complaining?