%Warning-USERFATAL: f_add = 15
                    ... Use "/* verilator lint_off USERFATAL */" and lint_on around source to disable this message.
%Error: t/t_func_const_struct_bad.v:16: Expecting expression to be constant, but can't determine constant for FUNCREF 'f_add2'
        t/t_func_const_struct_bad.v:27: ... Location of non-constant STOP: $stop executed during function constification; maybe indicates assertion firing
        t/t_func_const_struct_bad.v:37: ... Called from f_add() with parameters:
           params = '{a: 32'h7, b: 32'h8}
        t/t_func_const_struct_bad.v:16: ... Called from f_add2() with parameters:
           a = ?32?sh7
           b = ?32?sh8
           c = ?32?sh9
   localparam P24 = f_add2(7, 8, 9);
                    ^~~~~~
%Error: Exiting due to