[sv-ac] Is 'let' allowed as constant expression

Hi,
Is 'let' construct allowed to be used in context of constant expression?
For e.g.:

module top;
     let l(int x) = x;
     reg [l(1): 0] r;
endmodule

I did not see any reference in the LRM agreeing or disagreeing it. If it
is allowed, then I think we need to put some restriction on those usages
like constant function call as discussed in the LRM. Please share your
comments.

-- 
Regards
Surya
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