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