Is there any way to call a FnOnce inside a custom DST in a box? Unsafe or unstable is okay.

struct TaskNode<T: FnOnce() + ?Sized> {
    next: Option<Box<TaskNode<dyn FnOnce()>>>,
    task: T,
}

fn run_tasks(mut head: Option<Box<TaskNode<dyn FnOnce()>>>) {
    while let Some(node) = head {
        head = node.next;
        // How to actually do this??
        (node.task)();
    }
}

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