Ref

Can the method call on value be ignored?

Note: assume overriding resolution has been performed.

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.

Update field value of the abstract object

Invariant: fields are immutable and only set once

Update the immediate outer of the given klass of the abstract object

Invariant: outers are immutable and only set once