circ_mode2.m:014: Error: mode name `circ1'/1 expands to a mode containing
circ_mode2.m:014:   itself, which means that processing any reference to it
circ_mode2.m:014:   would require an infinite sequence of expansions.
circ_mode2.m:015: Error: mode name `circ2'/1 expands to a mode containing
circ_mode2.m:015:   itself, which means that processing any reference to it
circ_mode2.m:015:   would require an infinite sequence of expansions.
circ_mode2.m:017: Error: mode name `left'/1 expands to a mode containing itself
circ_mode2.m:017:   through `right'/1, which means that processing any
circ_mode2.m:017:   reference to it would require an infinite sequence of
circ_mode2.m:017:   expansions.
circ_mode2.m:018:   The definition of `right'/1 is here.