What's the point of [weak self] on some closures?

[sheinix]

Hi, I'm trying to use the library in my project with Swift4. I have noticed a few [weak self] in closures that don't make any difference as the closure is not held by self itself, like in the DispatchQueue. Is there a reason for this?
Example:

DispatchQueue.main.async { [weak self] _ in
			if self?.visibleSections[indexPath.section] == true {
				....
		}

[okhanokbay]

No, there is no reason, it makes no difference and should not be there.