verilator/test_regress/t/t_func_refio_bad.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2020 Wilson Snyder
// SPDX-License-Identifier: CC0-1.0

module t;
  typedef integer q_t[$];

  function void queue_set(ref q_t q);
    q.push_back(42);
  endfunction

  initial begin
    q_t iq;
    queue_set(42);  // 42 is bad, meant iq
  end
endmodule