The forward class annotations would not need need to be processed at runtime 
and could be no-ops. 

forward class A:
  x: int
  y: list[int]

A.__annotations__ could be empty. For a more complete example you could have,

forward class A:
  value: B # This annotation is solely for type checker and is not actually 
saved at runtime.

class B:
  value: A # Real annotation that is saved.

continue class A:
  value: B # Real annotation that is saved.

The rule would then be that any annotation inside forward class is equivalent 
to a noop. Continue class would still need to have same annotation repeated to 
actually set it at runtime.
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