Issue #12229 has been reported by Usaku NAKAMURA.

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Bug #12229: Backport r53673 to ruby_2_3
https://bugs.ruby-lang.org/issues/12229

* Author: Usaku NAKAMURA
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: 2.3
* Backport: 2.1: DONTNEED, 2.2: DONTNEED, 2.3: REQUIRED
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普通に実行すると失敗して大変にうざいのでbackportお願いします。



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