lib/test/unit/testcase.rb in test-unit-3.4.4 vs lib/test/unit/testcase.rb in test-unit-3.4.5

@@ -445,10 +445,10 @@
 
         private
         # @private
         @@method_locations = {}
         # @private
-        @@method_location_mutex = Mutex.new
+        @@method_location_mutex = Thread::Mutex.new
 
         # @private
         def method_locations
           @@method_locations[self] ||= []
         end