Cypclass type templates specialization

Cython/Compiler/PyrexTypes.py

@@ -3719,7 +3719,9 @@ class CppClassType(CType):
             return self.specializations[key]
         template_values = [t.specialize(values) for t in self.templates]
         specialized = self.specializations[key] = \
-            CppClassType(self.name, None, self.cname, [], template_values, template_type=self)
+            CppClassType(self.name, None, self.cname, [], template_values, template_type=self)\
+            if not self.is_cyp_class else\
+            CypClassType(self.name, None, self.cname, [], template_values, template_type=self)
         # Need to do these *after* self.specializations[key] is set
         # to avoid infinite recursion on circular references.
         specialized.base_classes = [b.specialize(values) for b in self.base_classes]