circ_inst.m:011: Error: inst name `circ'/0 expands to an inst containing
circ_inst.m:011:   itself, which means that processing any reference to it
circ_inst.m:011:   would require an infinite sequence of expansions.
circ_inst.m:013: Error: inst name `circ1'/0 expands to an inst containing
circ_inst.m:013:   itself through `circ2'/0, which means that processing any
circ_inst.m:013:   reference to it would require an infinite sequence of
circ_inst.m:013:   expansions.
circ_inst.m:015:   The definition of `circ2'/0 is here.