verilator/test_regress/t/t_fork_output_arg.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2023 Antmicro Ltd
// SPDX-License-Identifier: CC0-1.0

class Cls;
  int x = 100;
  task get_x(output int arg);
    arg = x;
  endtask
endclass

task automatic test;
  int o;
  Cls c = new;
  fork
    c.get_x(o);
  join_any
  if (o != 100) $stop;
endtask

module t;
  initial begin
    test();
    $write("*-* All Finished *-*\n");
    $finish;
  end
endmodule