Sorry, empty expression loops are not yet supported.  Currently waiting for resolution on language defect report.
Error unrolling production rule guard: 
	(&:j:[0..$i-1]: ~nandN::in[($i+$k+1)%nandN::N]) -> nandN::_out+
Error resolving production rule in loop:
$i = 0
Error resolving production rule in loop:
$k = 0
Error instantiating process footprint: 
From canonical type: nandN<4>
Error encountered during module::unroll.
ERROR in creating.  Aborting.
