Addr

Can the method call on value be ignored?

Note: assume overriding resolution has been performed.

Ensure the corresponding object exists in the heap

Whether the object is fully assigned

It means all fields and outers are set. For performance, we don't check outers here, because Scala semantics ensure that they are always set before any user code in the constructor.

Note that isFullyFilled = true does not mean we can use the object freely, as its fields or outers may still reach uninitialized objects.