--- Comment #3 from 2010-10-21 09:38:59 PDT ---
A more general solution it to add to D an optional standard method, that may be
named "onScan" or something else, that the garbage collection calls if present,
and returns information that the GC uses at runtime to know what contents to
follow, etc.

So a user-defined union may define such onScan(), that reads the instance tag
to say the GC what to do.

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