* test/ruby/test_backtrace.rb: get rid of warnings.  unused variable,
  shadowing.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45246 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-03-03

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45247 b2dd03c8-39d4-4d8f-98ff-823fe69b080e