Function check_closed

crates/vm/src/stdlib/_io.rs:361–367

(file: &PyObject, vm: &VirtualMachine)

    }

    fn check_closed(file: &PyObject, vm: &VirtualMachine) -> PyResult<()> {
        if file_closed(file, vm)? {
            Err(io_closed_error(vm))
        } else {
            Ok(())
        }
    }

    fn check_readable(file: &PyObject, vm: &VirtualMachine) -> PyResult<()> {
        if vm.call_method(file, "readable", ())?.try_to_bool(vm)? {