BT_ASSERT_PRE_FC_HAS_ID(fc, BT_FIELD_CLASS_TYPE_VARIANT, "Field class");
BT_ASSERT_PRE_FC_IS_ENUM(selector_fc, "Selector field class");
BT_ASSERT_PRE_FC_HOT(fc, "Variant field class");
BT_ASSERT_PRE_FC_HAS_ID(fc, BT_FIELD_CLASS_TYPE_VARIANT, "Field class");
BT_ASSERT_PRE_FC_IS_ENUM(selector_fc, "Selector field class");
BT_ASSERT_PRE_FC_HOT(fc, "Variant field class");