verilator/test_regress/t/t_json_only_first.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2012 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0

module t (/*AUTOARG*/
   // Outputs
   q,
   // Inputs
   clk, d
   );
   input clk;
   input [3:0] d;
   output wire [3:0] q;

   logic [3:0]       between;

   mod1 #(.WIDTH(4))
   cell1 (.q(between),
          .clk                          (clk),
          .d                            (d[3:0]));

   mod2
     cell2 (.d(between),
            .q                          (q[3:0]),
            .clk                        (clk));

endmodule

module mod1
  #(parameter WIDTH = 32)
   (
    input              clk,
    input [WIDTH-1:0]        d,
    output logic [WIDTH-1:0] q
   );

   localparam IGNORED = 1;

   always @(posedge clk)
     q <= d;

endmodule

module mod2
  (
   input clk,
   input [3:0] d,
   output wire [3:0] q
   );

   assign q = d;

endmodule