Issue #9466 has been reported by Tomoyuki Chikanaga.

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Backport #9466: backport r44758 (preserve class name encoding error messages.)
https://bugs.ruby-lang.org/issues/9466

* Author: Tomoyuki Chikanaga
* Status: Assigned
* Priority: Normal
* Assignee: Tomoyuki Chikanaga
* Category: 
* Target version: 
* ruby -v: 2.0.0-p353
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I didn't confirm it is required on 2_0_0 yet. Just for memorandum.



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