cla = modelbuilder.try_get_mclass_by_name(nexpr, mmodule, "Int")
else
cla = modelbuilder.try_get_mclass_by_name(nexpr, mmodule, "Char")
cla = modelbuilder.try_get_mclass_by_name(nexpr, mmodule, "Int")
else
cla = modelbuilder.try_get_mclass_by_name(nexpr, mmodule, "Char")