griffinjm commented on PR #672:
URL: 
https://github.com/apache/commons-collections/pull/672#issuecomment-4113418173

   Hi @garydgregory 
   The only test which can expose this bug, and prevent regressions would be a 
multithreaded test which triggers the phantom insertion causing the original 
iterator to fail. I can add one if necessary. I'll also attach some sequence 
diagrams below to help visualize the issue. Thanks.


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