%Warning-ASSIGNEQEXPR: t/t_lint_assigneqexpr.v:28:11: Assignment '=' inside expression
                                                    : ... Was a '==' intended, or suggest use a separate statement
   28 |       c_o = 1   
      |           ^
                       ... For warning description see https://verilator.org/warn/ASSIGNEQEXPR?v=latest
                       ... Use "/* verilator lint_off ASSIGNEQEXPR */" and lint_on around source to disable this message.
%Warning-ASSIGNEQEXPR: t/t_lint_assigneqexpr.v:30:11: Assignment '=' inside expression
                                                    : ... Was a '==' intended, or suggest use a separate statement
   30 |       c_o = 0   
      |           ^
%Error: Exiting due to