%Error: t/t_flag_unroll_limit_const.v:17:16: Expecting expression to be constant, but can't determine constant for FUNCREF 'f'
                                           : ... note: In instance 't'
        t/t_flag_unroll_limit_const.v:9:3: ... Location of non-constant LOOP: Loop simulation took too long; probably this is an infinite loop, otherwise set '--unroll-limit' above 4
        t/t_flag_unroll_limit_const.v:17:16: ... Called from 'f()' with parameters:
           x = ?32?h5
   17 |   output logic[f(5):0] o5    
      |                ^
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: Exiting due to