src/Testcases/YosysTestSuite/techmap/recursive.v - third_party/Surelog - Git at Google

 module top;
 sub s0();
 foo f0();
 endmodule

 module foo;
 sub s0();
 endmodule
	module top;
	sub s0();
	foo f0();
	endmodule

	module foo;
	sub s0();
	endmodule