[sv-bc] Assignment operator in continuous assignment

Hi,
In SV 1800, continuous assignment syntax allows only '=' assignment
operator. Why '+=', '-=' types of assignment operator not allowed. Why
someone can't write:

assign b += 1;

Which is just similar to
assign b = b + 1;

Is there any specific reason or is it case of BNF overlook?

-- 
Regards
Surya






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