CapturingNullableSlotMatcher
data class CapturingNullableSlotMatcher<T : Any>(val captureSlot: CapturingSlot<T?>, val argumentType: KClass<*>) : Matcher<T> , CapturingMatcher, TypedMatcher, EquivalentMatcher(source)
Matcher capturing one last nullable value to the CapturingSlot