%Error: t/t_mod_interface_array3.v:28:25: VARREF 't.__Vcellout__i_sub[2][1]__s' is not an unpacked array, but is in an unpacked array context
   28 |   sub i_sub[2:0][1:0] (.s(str));
      |                         ^
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: t/t_mod_interface_array3.v:28:25: VARREF 't.__Vcellout__i_sub[2][0]__s' is not an unpacked array, but is in an unpacked array context
   28 |   sub i_sub[2:0][1:0] (.s(str));
      |                         ^
%Error: t/t_mod_interface_array3.v:28:25: VARREF 't.__Vcellout__i_sub[1][1]__s' is not an unpacked array, but is in an unpacked array context
   28 |   sub i_sub[2:0][1:0] (.s(str));
      |                         ^
%Error: t/t_mod_interface_array3.v:28:25: VARREF 't.__Vcellout__i_sub[1][0]__s' is not an unpacked array, but is in an unpacked array context
   28 |   sub i_sub[2:0][1:0] (.s(str));
      |                         ^
%Error: t/t_mod_interface_array3.v:28:25: VARREF 't.__Vcellout__i_sub[0][1]__s' is not an unpacked array, but is in an unpacked array context
   28 |   sub i_sub[2:0][1:0] (.s(str));
      |                         ^
%Error: t/t_mod_interface_array3.v:28:25: VARREF 't.__Vcellout__i_sub[0][0]__s' is not an unpacked array, but is in an unpacked array context
   28 |   sub i_sub[2:0][1:0] (.s(str));
      |                         ^
%Error: Exiting due to