Ruby

fileutils.rb: fix error message

• lib/fileutils.rb (FileUtils#mv): show the exact target path in
  the error message instead of the destination parent directory
  name. patched by João Britto at
  [ruby-core:68706]. [Bug #11021]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e