Function tikv_util::callback::must_call

pub fn must_call<T: Send + 'static>(
    callback: impl FnOnce(T) + Send + 'static, 
    arg_on_drop: impl FnOnce() -> T + Send + 'static
) -> Callback<T>

Creates a callback that is automatically called on drop if it’s not called explicitly.

Note that leaking the callback can cause it to be never called but it rarely happens.

Also note that because callback and arg_on_drop may be called in the drop method, do not panic inside them or use safe_panic instead.