rb_io_each_line  3418 io.c               return rb_io_each_line(argc, argv, io);
rb_io_each_line  12286 io.c               rb_define_method(rb_cIO, "each",  rb_io_each_line, -1);
rb_io_each_line  12287 io.c               rb_define_method(rb_cIO, "each_line",  rb_io_each_line, -1);