Can't speak for everybody else, but I leave them a comment letting them know, try to find a pull request or commit that would have fixed it and close it if I can find one. Otherwise, a lot of times IBM's exhaustive catalogue of Swift releases on bluemix can usually reproduce tricky SRs.
2016/07/13 6:16、Alex Hoppen via swift-dev <firstname.lastname@example.org> のメッセージ:
I’m currently crawling bugs.swift.org for bugs to fix and regularly encounter bugs which I cannot reproduce on master anymore. What’s the standard protocol for them? Close them with resolution "Can’t Reproduce" or "Done" or just add a comment and let the reporter close it?
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