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On Sunday, 22 November 2015 at 15:25:28 UTC, Andrei Alexandrescu 
wrote:
> I don't know of any, but that's beside the point. RC can be 
> integrated with purity relatively easily if it's done 
> automatically by the compiler. The problem is library-level RC 
> does not work with immutability. -- Andrei

Not entirely. If there are any one can have a look how compiler 
organizes rc management internally there and what are current D 
limitations of doing so in a library. But I don't know any either 
and suspect it isn't coincidental.