> On Sep 22, 2017, at 2:38 AM, Howard Lovatt via swift-users 
> <swift-users@swift.org> wrote:
> 
> Hi,
> 
> I was using a weak reference in a concurrent application and and the main 
> thread wasn't seeing an update to a class's property made by another thread. 
> If I replaced the weak reference with a closure, the problem went away.
> 
> Is there any documentation that describes this behaviour?
> 
> Thanks in advance for any help,

Can you provide a more concrete example of the behavior you're seeing, and the 
behavior you expect?

-Joe
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