fileutils.rb: fix error for non-existent entry

* lib/fileutils.rb (FileUtils::Entry_#copy): ensure that the
  source entry exists first, to fix error for non-existent entry.
  [ruby-core:77885] [Bug #12892]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56551 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index 4317af5327..efceb2fba7 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -1244,6 +1244,7 @@ module FileUtils
     end
 
     def copy(dest)
+      lstat
       case
       when file?
         copy_file dest