1func BuildControllers(ctx context.Context, controllerCtx ControllerContext, controllerDescriptors map[string]*ControllerDescriptor,
 2	unsecuredMux *mux.PathRecorderMux, healthzHandler HealthCheckAdder) ([]Controller, error) {
 3	...
 4	buildController := func(controllerDesc *ControllerDescriptor) error {
 5		controllerName := controllerDesc.Name()
 6		ctrl, err := controllerDesc.BuildController(ctx, controllerCtx)
 7		...
 8		controllers = append(controllers, ctrl)
 9		checks = append(checks, check)
10		return nil
11	}
12	...
13	for _, controllerDesc := range controllerDescriptors {
14		...
15		if err := buildController(controllerDesc); err != nil {
16			return nil, err
17		}
18	}
19	...
20}