Suppress a warning.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46299 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_autoload.rb

@@ -73,6 +73,9 @@ p Foo::Bar
   end
 
   def test_threaded_accessing_constant
+    # Suppress "warning: loading in progress, circular require considered harmful"
+    old_verbose = $VERBOSE
+    $VERBOSE = false
     Tempfile.create(['autoload', '.rb']) {|file|
       file.puts 'sleep 0.5; class AutoloadTest; X = 1; end'
       file.close
@@ -87,6 +90,8 @@ p Foo::Bar
         remove_autoload_constant
       end
     }
+  ensure
+    $VERBOSE = old_verbose
   end
 
   def test_threaded_accessing_inner_constant