Issue #11794 has been reported by Usaku NAKAMURA.

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Bug #11794: backport r51808
https://bugs.ruby-lang.org/issues/11794

* Author: Usaku NAKAMURA
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.4p224 (2015-12-09 revision 52977) [x64-mswin64_100]
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: REQUIRED
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毎回mswinのCIでエラーなので。



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