src/Testcases/YosysTests/regression/issue_00194/top.v - third_party/Surelog - Git at Google

 module top(input a, output y);
   demo_sub sub (y, , 1'b1, a);
 endmodule

 module demo_sub(output y, z, input a, b);
   assign y = a & b, z = a | b;
 endmodule
	module top(input a, output y);
	demo_sub sub (y, , 1'b1, a);
	endmodule

	module demo_sub(output y, z, input a, b);
	assign y = a & b, z = a \| b;
	endmodule