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module  mux_test(
  din_0      , 
...
 output [7:0] mux_out; //just as an example
//stuff, stuff, and more stuff 
 endmodule

sub show_hier {
   # Recursively descend through module hierarchy,
...
       show_hier($cell->submod(), $indent, $hier, $cell->name()) if $c
+ell->submod();
   }
}