"Naked" rescue clauses only catch StandardError subclasses.

Similar to #11497.

railties/lib/rails/rack/logger.rb

@@ -38,7 +38,7 @@ def call_app(request, env)
         resp = @app.call(env)
         resp[2] = ::Rack::BodyProxy.new(resp[2]) { finish(request) }
         resp
-      rescue
+      rescue Exception
         finish(request)
         raise
       ensure

railties/test/rack_logger_test.rb

@@ -57,11 +57,14 @@ def test_notification
       end
 
       def test_notification_on_raise
-        logger = TestLogger.new { raise }
+        logger = TestLogger.new do
+          # using an exception class that is not a StandardError subclass on purpose
+          raise NotImplementedError
+        end
 
         assert_difference('subscriber.starts.length') do
           assert_difference('subscriber.finishes.length') do
-            assert_raises(RuntimeError) do
+            assert_raises(NotImplementedError) do
               logger.call 'REQUEST_METHOD' => 'GET'
             end
           end