Function ensure_unclosed

crates/vm/src/stdlib/_io.rs:164–170

(file: &PyObject, msg: &str, vm: &VirtualMachine)

    }

    fn ensure_unclosed(file: &PyObject, msg: &str, vm: &VirtualMachine) -> PyResult<()> {
        if file.get_attr("closed", vm)?.try_to_bool(vm)? {
            Err(vm.new_value_error(msg))
        } else {
            Ok(())
        }
    }

    /// Check if an error is an OSError with errno == EINTR.
    /// If so, call check_signals() and return Ok(None) to indicate retry.