%Error: t/t_assert_dup_bad.v:17:4: Duplicate declaration of block: 'covlabel'
   17 |    covlabel:   
      |    ^~~~~~~~
        t/t_assert_dup_bad.v:15:4: ... Location of original declaration
   15 |    covlabel:
      |    ^~~~~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: Exiting due to