[DGD] preserving vars after lib recompile

[bart at wotf.org]

Saw that I made a mistake in my last post:

On Wed, 17 Sep 2008 22:52:18 +0200, bart wrote

<snip>

> One thing to keep in mind is that you have to take care of the end 
> nodes, which in some cases could be libraries instead of objects,
>  consider this:
> 
> C is inherited by B, which was inherited by A, however, A has been destructed.
> This leaves B in memory.
> 
> Your upgrade system shouldn't try to compile A in this case, it 
> should destruct B (and then compile it if you want to leave things 
> exactly as they were)
> 
> If you don't do this, an old issue of A will be kept as well until something
> tries to inherit B and cause recompile(B) to be called in the driver 
> object, which will destruct B and free the old instance of A.

This should read: an old issue of C will be kept as well until something tries
to inherit B which will cause recompile(B) to be called in the driver object,
which will destruct B and free the old instance of C.
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