ENDER
mask |= ENDER;
case REPS | BEGIN | ENDER | STEP:
case REPS | BEGIN | ENDER:
case BEGIN | ENDER:
case BEGIN | ENDER | STEP:
case ENDER: /* Four cases involve only ender. */
case ENDER | STEP:
case REPS | ENDER:
case REPS | ENDER | STEP: