Revert the related commits about `Tempfile.open` change.

  Start with https://github.com/ruby/ruby/commit/fa21985a7a2f8f52a8bd82bd12a724e9dca74934
  to https://github.com/ruby/ruby/commit/d7492a0be885ea9f2b9f71e3e95582f9a859c439

1 files changed, 4 insertions, 1 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index c528eea0ae..fafb082154 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2814,7 +2814,7 @@ __END__
 
   def test_flush_in_finalizer1
     bug3910 = '[ruby-dev:42341]'
-    Tempfile.open("bug3910") {|t|
+    tmp = Tempfile.open("bug3910") {|t|
       path = t.path
       t.close
       fds = []
@@ -2826,6 +2826,7 @@ __END__
           f.print "hoge"
         }
       end
+      t
     }
   ensure
     ObjectSpace.each_object(File) {|f|
@@ -2833,6 +2834,7 @@ __END__
         f.close
       end
     }
+    tmp.close!
   end
 
   def test_flush_in_finalizer2
@@ -2856,6 +2858,7 @@ __END__
           end
         }
       end
+      t.close!
     }
   end