fiber_alloc       708 cont.c             return fiber_init(fiber_alloc(rb_cFiber), rb_proc_new(func, obj));
fiber_alloc       795 cont.c             fib = fiber_t_alloc(fiber_alloc(rb_cFiber));
fiber_alloc       998 cont.c             rb_define_alloc_func(rb_cFiber, fiber_alloc);