<ClassFormatError when using Context Receivers> I ...

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ClassFormatError when using Context Receivers
I was playing around with context receivers (added the opt-in compiler argument). The following code compiles, but throws a ClassFormatException:
package test

interface Semigroup<A> {
fun op(x: A, y: A): A
}

object PlusSemigroup : Semigroup {
override fun op(x: Int, y: Int): Int = x + y
}

data class Box<A>(val value: A)

context(Semigroup<A>)
interface BoxSemigroup<A> : Semigroup {
override fun op(x: Box<A>, y: Box<A>): Box<A> =
Box(op(x.value, y.value))
}

fun <A>...