I'm having some problems with delegation: ```class...

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[karelpeeters]

I'm having some problems with delegation:

class Test<K, V>(map: MutableMap<K, V>): MutableMap<K, V> by map

val test = Test(mutableMapOf(1 to "hello"))
test[1] += " there"

results in an exception at runtime:

Exception in thread "main" java.lang.IllegalAccessError: tried to access method kotlin.collections.MapsKt__MapsKt.set(Ljava/util/Map;Ljava/lang/Object;Ljava/lang/Object;)V from class BugKt
	at BugKt.main(Bug.kt:6)