import Clocks::*;

(* synthesize *)
module sysAncestorTest1();

   Clock clk2 <- mkAbsoluteClock(20,5);

   // this should trigger an error
   Empty sub <- mkSub(clk2);

endmodule

(* synthesize *)
(* clock_ancestors = "default_clock AOF clk_in" *)
module mkSub(Clock clk_in, Empty ifc);

   Reg#(UInt#(8)) count1 <- mkReg(0);
   Reg#(UInt#(8)) count2 <- mkReg(0, clocked_by clk_in);

   rule r1;
      count1 <= count1 + 1;
      $display("default_clock");
   endrule

   rule r2;
      count2 <= count2 + 1;
      $display("clk_in");
   endrule

endmodule: mkSub