docs: def p_pvar_inst_def(self, p):
          '''pvar_inst_def : IDENT LPAREN lconst_list RPAREN SEMI
                           | IDENT SEMI
                           | NOT IDENT LPAREN lconst_list RPAREN SEMI
                           | NOT IDENT SEMI
                           | IDENT LPAREN lconst_list RPAREN ASSIGN_EQUAL range_const SEMI
                           | IDENT ASSIGN_EQUAL range_const SEMI'''
          if len(p) == 6:
              p[0] = ((p[1], p[3]), True)
          elif len(p) == 3:
              p[0] = ((p[1], None), True)
          elif len(p) == 7:
              p[0] = ((p[2], p[4]), False)
          elif len(p) == 4:
              p[0] = ((p[2], None), False)
          elif len(p) == 8:
              p[0] = ((p[1], p[3]), p[6])
          elif len(p) == 5:
              p[0] = ((p[1], None), p[3])