[Backport92 - Backport #5289][Open] backport #5279 into ruby1.9.2

Issue #5289 has been reported by Shota F…


Backport #5289: backport #5279 into ruby1.9.2
http://redmine.ruby-lang.org/issues/5289

Author: Shota F.
Status: Open
Priority: Normal
Assignee: Yuki S.
Category:
Target version:

http://redmine.ruby-lang.org/issues/5279

この問題は1.9.2でも再現するようなので,r33201 のバックポートをお願いします.