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It is not appropriate to decorate each forward declaration with the SIP
attribute /External/. That is only needed for forward declarations of
types which are defined in a different module.
Local forward declarations can be omitted from the sip code. In sip
code, a forward declaration followed later by a full class definition is
an error.
Omit forward declarations unless they are decorated with the external
attribute. Introduce a rules database for consumers to decorate them
with the attribute as required.
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