* test/fileutils/test_fileutils.rb: add debug output to investigate the error that occur at random on Windows CI.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52904 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/fileutils/test_fileutils.rb

@@ -109,7 +109,12 @@ class TestFileUtils < Test::Unit::TestCase
         false
       end
     ensure
+      begin
         Dir.rmdir tmproot
+      rescue
+        STDERR.puts $!.inspect
+        STDERR.puts Dir.entries(tmproot).inspect
+      end
     end
   end
   include m