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gw:wcp types in Guile-Gnome

From: Tommi Höynälänmaa
Subject: gw:wcp types in Guile-Gnome
Date: Thu, 17 Aug 2017 19:06:21 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1
Pango attributes are instances of class <gw:wcp> in Guile-Gnome but they are not GOOPS instances (i.e. (instance? x) returns false). Class name <pango-attribute> is not defined at all. How can I test if an arbitrary object belongs to some specific <gw:wcp> class, e.g. if an object is a Pango attribute? 

     - Tommi Höynälänmaa
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