Issue #14642 has been reported by usa (Usaku NAKAMURA).

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Bug #14642: Fiber make crash on Windows
https://bugs.ruby-lang.org/issues/14642

* Author: usa (Usaku NAKAMURA)
* Status: Assigned
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* Target version: 
* ruby -v: trunk r62966
* Backport: 2.3: DONTNEED, 2.4: DONTNEED, 2.5: DONTNEED
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We found that r62966 causes crash on Windows.
Of course, the patch seems to be no problem, so I guess that this code just happened to reveal a potential bug.

FYI, AppVayor and mswinci both reported the crash, but they didn't show any details. 

Stable versions don't contain the patch, but will be backported later, maybe.



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