%Error-UNSUPPORTED: t/t_queue_method3_bad.v:16:52: Unsupported: Member call on object 'SEL' which is a 'BASICDTYPE 'int'' : ... In instance t 16 | points_qv = points_q.find_first(a) with (a.x.index == 0); | ^~~~~ ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest %Error: Internal Error: t/t_queue_method3_bad.v:16:58: ../V3Width.cpp:#: Node has no type : ... In instance t 16 | points_qv = points_q.find_first(a) with (a.x.index == 0); | ^~ ... See the manual at https://verilator.org/verilator_doc.html for more assistance.