Confused why this doesn’t work: ```private fun interface MySam { fun invoke() companion...

# announcements

[Mark]

Confused why this doesn’t work:

private fun interface MySam {
    fun invoke()
    
    companion object {
        operator fun invoke(randomArg: String) = MySam { }
    }
}

When invoking MySam("anything") we get:

Exception in thread "main" java.lang.ClassCastException: MySam$Companion$invoke$1 cannot be cast to kotlin.jvm.functions.Function

UPDATE: workaround is to instead declare as an extension function of the companion object :

private operator fun MySam.Companion.invoke(randomArg: Int) = MySam { }

UPDATE2: Another workaround is to change interface visibility to non-private, then it works. Is this expected behavior?
Try it out here: https://pl.kotl.in/OxBHwZAn5

[kqr]

is the last parameter lambda?

[Mark]

Not sure what you mean

[kqr]

ignore me

[Tomasz Krakowiak]

@Mark It's a compiler bug - https://youtrack.jetbrains.com/issue/KT-45444