BT_ASSERT_PRE_FC_IS_ENUM(selector_fc, "Selector field class");
BT_ASSERT_PRE_FC_HOT(fc, "Variant field class");
var_fc->selector_fc = (void *) selector_fc;
BT_ASSERT_PRE_FC_IS_ENUM(selector_fc, "Selector field class");
BT_ASSERT_PRE_FC_HOT(fc, "Variant field class");
var_fc->selector_fc = (void *) selector_fc;