Issue #4145 has been updated by Yui NARUSE.

Status changed from Open to Assigned
Assigned to set to Yui NARUSE

Strings encoded in UTF-16 don't support concatenation.
Use UTF-16BE or UTF-16LE for processing.

I'm considering to warn concatenation of strings encoded in dummy encoding.
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http://redmine.ruby-lang.org/issues/show/4145

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http://redmine.ruby-lang.org