Raise ArgumentError if sprintf format string ends with %
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58890 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Raise ArgumentError if sprintf format string ends with %
Patch by Yuta Iwama and Shintaro Morikawa.
[ruby-core:80153] [Bug #13315] [Fix GH-1560]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58890 b2dd03c8-39d4-4d8f-98ff-823fe69b080e