[sv-bc] Constant method calls

Can a method_call be a constant_primary if the root of the method_call
is constant?
 
For example, could a call to a method of an enum-valued parameter be
used as a constant expression?  
 
        localparam E P = P.first;
        localparam E Q = P.next(N-1);
 
I don't find anything in the LRM saying that this is legal.
 
-- Brad
 

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