A @<class-forward-declaration> informs Sod that an @<identifier> will be used
to name a class which is currently undefined. Forward declarations are
necessary in order to resolve certain kinds of circularity. For example,
A @<class-forward-declaration> informs Sod that an @<identifier> will be used
to name a class which is currently undefined. Forward declarations are
necessary in order to resolve certain kinds of circularity. For example,