--- boost/python/converter/implicit.hpp~	2007-09-06 21:58:01.141553000 +0200
+++ boost/python/converter/implicit.hpp	2007-09-07 18:19:09.529179000 +0200
@@ -31,8 +31,7 @@
         void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes;
 
         arg_from_python<Source> get_source(obj);
-        bool convertible = get_source.convertible();
-        BOOST_ASSERT(convertible);
+        BOOST_ASSERT(get_source.convertible());
         
         new (storage) Target(get_source());