Issue #9550 has been reported by Usaku NAKAMURA.

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Bug #9550: backport r45066
https://bugs.ruby-lang.org/issues/9550

* Author: Usaku NAKAMURA
* Status: Closed
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: -
* Backport: 1.9.3: REQUIRED, 2.0.0: REQUIRED, 2.1: REQUIRED
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個別にbackportチケットを切るのがめんどいので手抜いてこっちに作ります。



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