/test.kt:(68,70): error: The function 'fun <C : Any!> foo(): (Mutable)List<C!>!' defined in 'JI' from an interface is generic, but the function 'fun foo(): (MutableList<Any?>..List<*>?)' defined in 'JC' from a delegate is not.
Such an implementation can provoke runtime errors.

/test.kt:(90,92): error: The function 'fun <T> foo(): List<T>' defined in 'KI' from an interface is generic, but the function 'fun foo(): (List<Any?>..List<*>)' defined in 'JKC' from a delegate is not.
Such an implementation can provoke runtime errors.
