CIGAL Reference Manual, Chapter 6 (RealTime): r_end
usage: r_end opflg eflag ltime
R_END is a REALTIME operator. It is used to delimit the end of a repeat loop (see R_REPEAT(6)), a forked command block (see R_FORK(6)), or a conditional switch structure (see R_SWITCH(6)). Every R_REPEAT, R_FORK, or R_SWITCH operator must be paired with a corresponding R_END.
See Also:
R_FORK(6)