%Error: t/t_stream_bad.v:14:25: Expecting expression to be constant, but can't convert a RAND to constant.
                              : ... note: In instance 't'
   14 |     packed_data_32 = {<<$random{byte_in}};
      |                         ^~~~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: t/t_stream_bad.v:14:23: Slice size isn't a constant or basic data type.
                              : ... note: In instance 't'
   14 |     packed_data_32 = {<<$random{byte_in}};
      |                       ^~
%Error: t/t_stream_bad.v:15:25: Expecting expression to be constant, but variable isn't const: 'x'
                              : ... note: In instance 't'
   15 |     packed_data_32 = {<<x{byte_in}};
      |                         ^
%Error: t/t_stream_bad.v:15:23: Slice size isn't a constant or basic data type.
                              : ... note: In instance 't'
   15 |     packed_data_32 = {<<x{byte_in}};
      |                       ^~
%Error: Exiting due to