I want to make a toggle latch from D latch using only data flow only:

module latcht(
   input T,
      output Led
   );

wire d, c, qn;
//1'b0;
assign c = 1'b1;
assign d = q^T;
latchd U1( d, c, q, qn);


endmodule

module latchd(
   input D,
   input C,
   output Q,
      output Qn
   );
     

/*assign Q = ((C==1'b1&&D==1'b0)? 1'b0 (C==1'b1 && D==1'b1)?1'b1: Q));
assign Qn = ~Q;*/

endmodule

But when i tested the logic of the Led, it hold at z state all the time

Sorry for my poor english