module test; typedef struct packed { logic [9:-1][2:0] a; //REQ-EXT-10001, REQ-EXT-10004 } ST1; typedef struct { ST1 st1; logic [2:0] b; } ST2; typedef struct { logic [31:0] c; } ST3; typedef struct { ST3 st3; ST2 st2_arr[3:0]; } ST4; initial begin ST2 st2; ST2 st2_1 = {3'b101, {ST1{10'b110}}, {ST1{20'b10101010101010}},{ST1{30'b1}}}; ST2 st2_2 = {3'b010, {ST1{10'b101}}, {ST1{20'b01010101010101}},{ST1{30'b0}}}; st2 = {2'b01, {3'b1, 3'b0, 12'b1}}; $display("%p",st2); //CHECK-001:'{a:'h1}, st2:'{'a:'h1}, '{a:'h0},'{a:h1}}} $display("st2_1:%p", st2_1); //CHECK-002 $display("st2_2:%p", st2_2); //CHECK-003 end endmodule this piece of system verilog code has syntax error about the assignment of st2 array, how should I fix it?

The error in the code is due to the incorrect syntax of the assignment of the st2 array. The correct syntax should be:

st2 = {2'b01, {{ST1{3'b1}}, {ST1{3'b0}}, {ST1{12'b1}}}};

This initializes the st2 array with three elements, each of which is a combination of an ST1 structure and a 3-bit logic value. Note that the ST1 initialization syntax has also been corrected.

After the fix, the code should compile without error.