verilator/test_regress/t/t_assert_disable_bad.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2022 Antmicro Ltd
// SPDX-License-Identifier: CC0-1.0

module t (
    input clk
);

  int cyc = 0;
  logic val = 0;

  always @(posedge clk) begin
    cyc <= cyc + 1;
    val = ~val;
  end

  property check(int cyc_mod_2, logic expected);
    @(posedge clk) disable iff (cyc == 0) cyc % 2 == cyc_mod_2 |=> val == expected;
  endproperty

  // Test should fail due to duplicated disable iff statements
  // (IEEE 1800-2023 16.12.1).
  assert property (disable iff (val == 0) check(1, 1));
endmodule