[sv-bc] Is $unit allowed in compilation unit

Hi,
As per SV LRM, any reference of outside the package is error. But 
consider the case:

const int k = 258;
typedef enum int {FALSE=0, TRUE} mbool;
function int f(input int x );
return (x ^ $unit::k); // <---- is it an error?
endfunction

module top;
endmodule

Where $unit is used inside the compilation unit (which is also a 
package). Is it legal? Some tools fail the case. I don't think this is 
invalid.

-- 
Regards
Surya





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