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[plt-scheme] scheme/class: attaching properties to classes

From: Grant Rettke (grettke at acm.org)
Date: Fri Sep 12 19:50:37 EDT 2008		 
> With the latest in SVN, a class can implement `printable<%>' (which is
> exported by `scheme/class') and define its `custom-write' and
> `custom-display' methods to get custom printing.

Nice.
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