[sv-ec] restriction on typedef on net.

Typedef cannot be used to define NET types. This is very inconvienient ie we
have code like below.
 
module add_sub (   
    input add,
    input sub,
    input [24:0] fa,
    input [24:0] fb,
    output [24:0] sum
    );  
 
Port signals like wire [24:0] are widely used in lots of module declaration.

It would be nice to can wrtie it like below
typedef wire [24:0] T;
module add_sub (   
    input add,
    input sub,
    input T fa,
    input T fb,
    output T sum
    );  
 
Why LRM dissalows this?
 
DANiel

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