verilator/test_regress/t/t_lint_unused_iface_bad.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed into the Public Domain, for any use,
// without warranty, 2017 by Wilson Snyder.

interface dummy_if ();
   logic sig_udrv;
   logic sig_uusd;
endinterface: dummy_if

module sub
  (
   dummy_if dummy
   );

   assign dummy.sig_uusd = 1'b0 | dummy.sig_udrv;
endmodule


module t (/*AUTOARG*/);

   dummy_if dummy ();

   sub sub
     (.dummy(dummy)
      );

endmodule