// SPDX-License-Identifier: MIT
`timescale 1ns/1ps
module tb;
  logic [3:0] a,b; logic [3:0] narrow; logic [4:0] wide;
  initial begin
    a=15; b=1; narrow=a+b; wide=a+b; #1; $display("OBS narrow=%0d wide=%0d",narrow,wide);
    $finish;
  end
endmodule