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From "Chris Kimpton" <>
Subject Re: How do I get an exception for a null macro expansion
Date Tue, 20 Mar 2001 23:26:30 GMT

----- Original Message -----
From: "Geir Magnusson Jr." <>
> So, just dreaming here (and I think I figured a way to do it very, very
> easily while driving home this evening), we could define a set of
> runtime actions that one could register a callback for, such as
>  - invalid reference
>  - invalid #set assignment
> and I am sure more will come out of the woodwork.  I *think* I have a
> clean, straightforward way to do it w/o munging up the internals or
> slowing anything down (unless you do something slow on the callback...)
> and will play with it this week.  And we may want to wait until after
> 1.0, but its so simple...

Any progress with this thought Geir - it sounded just like what I needed


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