rb_io_open       3475 io.c               io = rb_io_open(RSTRING(fname)->ptr, "r");
rb_io_open       3503 io.c               arg.io = rb_io_open(RSTRING(fname)->ptr, "r");
rb_io_open       3528 io.c               arg.io = rb_io_open(RSTRING(fname)->ptr, "r");