[sv-ec] virtual interfaces restriction

Mantis 1441 complatins that sensivity list in virtaul interface usage
restriction is not well defined.
 <http://www.verilog.org/mantis/view.php?id=1441>
http://www.verilog.org/mantis/view.php?id=1441
That is true that sensivity list should be defined.
 
But imho there is no sense for forbiding virtual interfaces on sensivity
list as this is hard to define. The 2nd restriction about assign is ok - as
vi was not added for design construct and assign is purely design one.
Summarizing I do not see the reason to forbid the code:
 
module top;
        iface if1();
        iface if2();
        virtual iface vi=if1;
 
        always @(vi.a) begin //vi on sensivity list
                $display($time);
        end
 
        initial
                forever @(vi.a) 
                $display("2 %d",$time);
endmodule
 

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