%Error: t/t_assert_dup_bad.v:15:3: Duplicate declaration of block: 'covlabel'
   15 |   covlabel :   
      |   ^~~~~~~~
        t/t_assert_dup_bad.v:13:3: ... Location of original declaration
   13 |   covlabel :
      |   ^~~~~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: Exiting due to