verilator/test_regress/t/t_inst_recurse_bad.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2005 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0

module t (/*AUTOARG*/
   // Inputs
   clk
   );

   input clk;

   looped looped ();

endmodule

module looped (/*AUTOARG*/);
   looped2 looped2 ();
endmodule

module looped2 (/*AUTOARG*/);
   looped looped ();
endmodule