module test;
reg [15:0] x;
reg [15:0] y;
initial begin
x = 0;
y = 0;
$monitor(x,,y);
$background_copy(x, y);
#1 $display("started background copy");
#1 x = 1;
#1 x = 2;
#1 $display("finished background copy");
end
endmodule