remove begin-rescue in favor of def-rescue

actionpack/lib/action_dispatch/middleware/debug_exceptions.rb

@@ -14,18 +14,17 @@ module ActionDispatch
     end
 
     def call(env)
-      begin
       _, headers, body = response = @app.call(env)
 
       if headers['X-Cascade'] == 'pass'
         body.close if body.respond_to?(:close)
         raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
       end
+
+      response
     rescue Exception => exception
       raise exception if env['action_dispatch.show_exceptions'] == false
-      end
-
-      exception ? render_exception(env, exception) : response
+      render_exception(env, exception)
     end
 
     private