rb_fiber_yield   1633 cont.c             return rb_fiber_yield(argc, argv);
rb_fiber_yield    610 enumerator.c       rb_fiber_yield(1, &args);
rb_fiber_yield    628 enumerator.c       return rb_fiber_yield(1, &nil);
rb_fiber_yield    220 include/ruby/intern.h VALUE rb_fiber_yield(int argc, const VALUE *argv);