gEDA-user: Icarus misses unconnected nets?

[Tom Hawkins]

Icarus is not reporting unconnected nets with -Wall.  Am I missing 
something?  I always thought it did.

      1 module test (x);
      2   output x;
      3   wire b;
      4   assign x = b;
      5 endmodule
$ iverilog -Wall test.v
$ # Nothing!
I'm running 0.8.
Thanks!
-Tom