module test; typedef struct packed { logic [2:0] b; ///REQ-EXT-10001, REQ-EXT-10004 } ST4; typedef struct packed { logic [9:-1][2:0] a; ST4 st4[1:0]; } ST3; typedef struct { ST3 st3; ST4 st4; }ST5; typedef struct { ST5 st5; ST2 st2[2:0]; }ST2; initial begin ST2 st2[2:0] = '{'{b:'h2}, '{b:'h1}, '{b:'h0}}; ST3 st3 ='{'{st1:'{'{a:'h1}}, st2}; $display("%p", st3); end endmodule there are several errors in this piece of code, how should I modify it so it can be compiled successfully by vcs?

There are a few errors in this code that need to be corrected:

1. The definition of ST2 is incomplete, so the compiler will not recognize it. You need to define ST2 before using it in the definition of ST5.

2. The initialization of ST2 is incorrect. You need to use curly braces to initialize the ST4 struct, and you need to use a colon to separate the field name from the value.

3. The initialization of ST3 is incorrect. You need to use curly braces to initialize the ST1 struct, and you need to use a colon to separate the field name from the value.

Here is the corrected code:

module test;
    typedef struct packed {
        logic [2:0] b; ///REQ-EXT-10001, REQ-EXT-10004
    } ST4;

    typedef struct packed {
        logic [9:-1][2:0] a;
        ST4 st4[1:0];
    } ST3;

    typedef struct {
        ST3 st3;
        ST4 st4;
    } ST5;

    typedef struct {
        ST5 st5;
        ST4 st2[2:0];
    } ST2;

    initial begin
        ST4 st4_arr[2:0] = '{'{b:'h2}, '{b:'h1}, '{b:'h0}};
        ST2 st2_arr[2:0] = '{'{st4: st4_arr[2]}, '{st4: st4_arr[1]}, '{st4: st4_arr[0]}};
        ST3 st3 ='{st1:{a:'h1}}, st2_arr};
        $display("%p", st3);
    end
endmodule