%Error-UNSUPPORTED: t/t_queue_empty_bad.v:11:11: Unsupported/Illegal: empty queue ('{}') in this context : ... note: In instance 't' 11 | i = {} + 1; | ^ ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest %Error-UNSUPPORTED: t/t_queue_empty_bad.v:13:9: Unsupported/Illegal: empty queue ('{}') in this assign context : ... note: In instance 't' 13 | i = {}; | ^ %Error: Exiting due to