string.c: reset code range
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46243 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: reset code range
string too, not only copied string.
[ruby-core:62842] [Bug #9882]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46243 b2dd03c8-39d4-4d8f-98ff-823fe69b080e