Default values for for top-level ports do not seem to work.

[nachiket]

Default values for for top-level ports do not seem to work.

MWE:

$ iverilog -g2012 test.sv

$ ./a.out
x=z,a=z
test.sv:5: $finish called at 2 (1s)

$ cat test.sv
module test (input a = 0, input b = 0, output x);
  assign x = a;
  initial begin
    #1 $monitor("x=%d,a=%d",x,a);
    #1 $finish();
  end
endmodule